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
Sep. 30, 2025
Dec. 31, 2024
Financing receivable, gross $ 13,311,967 $ 12,605,836
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Commercial Real Estate Portfolio Segment [Member]    
Financing receivable, gross 2,945,784 2,869,894
Real Estate Portfolio Segment[Member]    
Financing receivable, gross 8,754,061 8,173,009
Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 1,532,285 1,489,306
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 2,680,055 2,547,143
Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 1,625,296 1,444,623
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 4,448,710 4,181,243
Consumer Portfolio Segment [Member]    
Financing receivable, gross 79,837 73,627
Real Estate [Member]    
Financing receivable, gross 170,115 64,678
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 29,756 18,901
Real Estate [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 87,237 43,187
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 53,122 2,590
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 15,713 24,935
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 6,692 3,719
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 64,832 14,533
Real Estate [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 0 0
Collateral, Accounts Receivable [Member]    
Financing receivable, gross 1,767 1,721
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 1,767 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 3,525 7,558
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 3,416 7,449
Equipment [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 109 109
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 109 109
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 41,511 45,338
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 38,218 42,684
Collateral, Other [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 1,233 953
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 357 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 1,115 755
Collateral Pledged [Member]    
Financing receivable, gross 216,918 119,295
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 23,410 23,628
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 73,157 70,755
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 20,341 17,615
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 88,579 44,249
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1,954 5,258
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 54,067 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 16,070 25,013
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 2,890
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 6,801 3,828
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 397 287
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 65,708 15,408
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1,557 2,081
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 1,115 755
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest $ 1,115 $ 755