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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Financing receivable, gross $ 9,898,957 $ 9,532,934    
Allowance for credit losses 119,463 116,660 $ 94,906 $ 87,942
Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 2,955,927 2,984,053    
Allowance for credit losses 41,417 41,869 38,232 36,370
Real Estate Portfolio Segment[Member]        
Financing receivable, gross 5,715,666 5,378,952    
Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 1,164,690 1,103,076    
Allowance for credit losses 27,821 26,994 19,391 16,057
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 1,919,811 1,874,103    
Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 926,697 826,765    
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 2,869,158 2,678,084    
Consumer Portfolio Segment [Member]        
Financing receivable, gross 62,674 66,853    
Allowance for credit losses 1,677 1,968 $ 1,676 $ 1,793
Real Estate [Member]        
Financing receivable, gross 32,933 33,258    
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 12,332 13,067    
Real Estate [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 20,601 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 4,279 4,372    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 3,551 2,982    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 12,771 12,837    
Real Estate [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member]        
Financing receivable, gross 5,132 5,075    
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 5,132 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 17,864 18,533    
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 17,864 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 29,337 27,599    
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 28,097 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 1,240 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 85,266 84,465    
Allowance for credit losses 11,901 11,292    
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 63,425 64,274    
Allowance for credit losses 9,503 9,727    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 20,601 20,191    
Allowance for credit losses 2,398 1,565    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 1,240 0    
Allowance for credit losses 0 0    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 4,279 4,372    
Allowance for credit losses 1,484 1,371    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 3,551 2,982    
Allowance for credit losses 285 163    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 12,771 12,837    
Allowance for credit losses 629 31    
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Allowance for credit losses $ 0 $ 0