Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Loans - Summary of Collateral Types (Details)

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Note 5 - Loans - Summary of Collateral Types (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Financing receivable, gross $ 10,617,320   $ 9,532,934      
Allowance for credit losses 128,387 $ 119,463 116,660 $ 104,670 $ 94,906 $ 87,942
Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 2,966,040   2,984,053      
Allowance for credit losses 41,610 41,417 41,869 42,433 38,232 36,370
Real Estate Portfolio Segment[Member]            
Financing receivable, gross 6,203,015   5,378,952      
Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 1,383,155   1,103,076      
Allowance for credit losses 35,993 27,821 26,994 22,413 19,391 16,057
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 2,026,807   1,874,103      
Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 1,015,698   826,765      
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 3,160,510   2,678,084      
Consumer Portfolio Segment [Member]            
Financing receivable, gross 65,110   66,853      
Allowance for credit losses 1,992 $ 1,677 1,968 $ 1,294 $ 1,676 $ 1,793
Real Estate [Member]            
Financing receivable, gross 32,360   33,258      
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 12,330   13,067      
Real Estate [Member] | Real Estate Portfolio Segment[Member]            
Financing receivable, gross 20,030   20,191      
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 0   0      
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 4,100   4,372      
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 3,226   2,982      
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 12,704   12,837      
Real Estate [Member] | Consumer Portfolio Segment [Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member]            
Financing receivable, gross 5,174   5,075      
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 5,174   5,075      
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 0   0      
Collateral, Accounts Receivable [Member] | Consumer Portfolio Segment [Member]            
Financing receivable, gross 0   0      
Equipment [Member]            
Financing receivable, gross 3,246   18,533      
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 3,246   18,533      
Equipment [Member] | Real Estate Portfolio Segment[Member]            
Financing receivable, gross 0   0      
Equipment [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 0   0      
Equipment [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 0   0      
Equipment [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 0   0      
Equipment [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 0   0      
Equipment [Member] | Consumer Portfolio Segment [Member]            
Financing receivable, gross 0   0      
Collateral, Other [Member]            
Financing receivable, gross 26,321   27,599      
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 25,094   27,599      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member]            
Financing receivable, gross 0   0      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 1,227   0      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 0   0      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 0   0      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 0   0      
Collateral, Other [Member] | Consumer Portfolio Segment [Member]            
Financing receivable, gross 0   0      
Collateral Pledged [Member]            
Financing receivable, gross 67,101   84,465      
Allowance for credit losses 10,428   11,292      
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross 45,844   64,274      
Allowance for credit losses 8,264   9,727      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]            
Financing receivable, gross 20,030   20,191      
Allowance for credit losses 2,068   1,565      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross 1,227   0      
Allowance for credit losses 96   0      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross 4,100   4,372      
Allowance for credit losses 1,837   1,371      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross 3,226   2,982      
Allowance for credit losses 231   163      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross 12,704   12,837      
Allowance for credit losses 0   31      
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]            
Financing receivable, gross 0   0      
Allowance for credit losses $ 0   $ 0