Quarterly report [Sections 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, 2025
Dec. 31, 2024
Financing receivable, gross $ 13,232,560 $ 12,605,836 [1]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Commercial Real Estate Portfolio Segment [Member]    
Financing receivable, gross 2,966,191 2,869,894
Real Estate Portfolio Segment[Member]    
Financing receivable, gross 8,457,869 8,173,009
Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 1,735,405 1,489,306
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 2,557,711 2,547,143
Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 1,561,461 1,444,623
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 4,338,697 4,181,243
Consumer Portfolio Segment [Member]    
Financing receivable, gross 73,095 73,627
Real Estate [Member]    
Financing receivable, gross 56,826 64,678
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 18,795 18,901
Real Estate [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 30,588 43,187
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 7,443 2,590
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 16,583 24,935
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 4,961 3,719
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 9,044 14,533
Real Estate [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 0 0
Collateral, Accounts Receivable [Member]    
Financing receivable, gross 1,836 1,721
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 1,836 1,721
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] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 0 0
Collateral, Accounts Receivable [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 0 0
Equipment [Member]    
Financing receivable, gross 15,577 7,558
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 15,470 7,449
Equipment [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 107 109
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 107 109
Equipment [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 0 0
Equipment [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 0 0
Collateral, Other [Member]    
Financing receivable, gross 40,347 45,338
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 37,370 42,684
Collateral, Other [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 1,232 953
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 945 946
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 356 78
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] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 876 875
Collateral, Other [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 800 755
Collateral Pledged [Member]    
Financing receivable, gross 114,586 119,295
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 19,794 23,628
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 73,471 70,755
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 15,349 17,615
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 31,927 44,249
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 3,645 5,258
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 8,388 3,536
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 16,939 25,013
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1,674 2,890
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 5,068 3,828
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 457 287
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 9,920 15,408
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1,514 2,081
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 800 755
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest $ 800 $ 755
[1] Derived from audited financial statements.