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
Mar. 31, 2026
Dec. 31, 2025
Financing receivable, gross $ 13,945,913 $ 13,696,912 [1]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Commercial Real Estate Portfolio Segment [Member]    
Financing receivable, gross 3,189,704 3,146,736
Real Estate Portfolio Segment[Member]    
Financing receivable, gross 9,153,294 9,014,925
Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 1,531,042 1,457,628
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 2,718,512 2,739,823
Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 1,695,140 1,671,713
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 4,739,642 4,603,389
Consumer Portfolio Segment [Member]    
Financing receivable, gross 71,873 77,623
Real Estate [Member]    
Financing receivable, gross 181,640 173,618
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 18,769 18,792
Real Estate [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 125,837 118,880
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 37,034 35,946
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 26,720 21,076
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 9,897 9,887
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 89,220 87,917
Real Estate [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 0 0
Collateral, Accounts Receivable [Member]    
Financing receivable, gross 2,175 2,247
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 2,175 2,247
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 3,923 2,887
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 3,814 2,763
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 15
Collateral, Other [Member]    
Financing receivable, gross 29,859 32,851
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 27,336 30,235
Collateral, Other [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 875 951
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 944 944
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 0 76
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 875 875
Collateral, Other [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 704 721
Collateral Pledged [Member]    
Financing receivable, gross 217,597 211,603
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 26,496 24,778
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member]    
Financing receivable, gross 52,094 54,037
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 12,523 17,465
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]    
Financing receivable, gross 126,821 119,940
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 6,819 5,880
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 37,978 36,890
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 6,450 712
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 26,720 21,152
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 57 0
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 10,006 9,996
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 267 446
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]    
Financing receivable, gross 90,095 88,792
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 6,495 5,434
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]    
Financing receivable, gross 704 736
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest $ 704 $ 721
[1] Derived from audited financial statements.