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Note 5 - Loans - Summary of Collateral Types (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financing Receivable, before Allowance for Credit Loss | $ 12,886,831 | $ 12,605,836 |  |
Financing Receivable, Allowance for Credit Loss | 165,034 | 164,458 | $ 155,892 | $ 153,317
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,924,533 | 2,869,894 |  |
Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 52,518 | 55,330 | 51,022 | 52,121
Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,297,574 | 8,173,009 |  |
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,599,410 | 1,489,306 |  |
Financing Receivable, Allowance for Credit Loss | 41,809 | 38,597 | 45,689 | 44,658
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,543,819 | 2,547,143 |  |
Financing Receivable, Allowance for Credit Loss | 21,330 | 22,302 | 18,391 | 17,702
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,494,189 | 1,444,623 |  |
Financing Receivable, Allowance for Credit Loss | 15,246 | 14,096 | 12,994 | 12,029
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,259,566 | 4,181,243 |  |
Financing Receivable, Allowance for Credit Loss | 31,853 | 31,328 | 26,255 | 25,395
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 65,314 | 73,627 |  |
Financing Receivable, Allowance for Credit Loss | 2,278 | 2,805 | $ 1,541 | $ 1,412
Real Estate [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 60,847 | 64,678 |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 30,859 | 18,901 |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 22,044 | 43,187 |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 7,944 | 2,590 |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 12,443 | 24,935 |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 5,166 | 3,719 |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,435 | 14,533 |  |
Real Estate [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,656 | 1,721 |  |
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,656 | 1,721 |  |
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Accounts Receivable [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Equipment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 7,574 | 7,558 |  |
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,642 | 7,449 |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 932 | 109 |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 202 | 109 |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 730 | 0 |  |
Equipment [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Collateral, Other [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 41,694 | 45,338 |  |
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 38,199 | 42,684 |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,809 | 953 |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,686 | 946 |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 70 | 78 |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 802 | 0 |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 937 | 875 |  |
Collateral, Other [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 755 |  |
Collateral Pledged [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 111,771 | 119,295 |  |
Financing Receivable, Allowance for Credit Loss | 20,495 | 23,628 |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial, and Agricultural Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 77,356 | 70,755 |  |
Financing Receivable, Allowance for Credit Loss | 15,127 | 17,615 |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 24,785 | 44,249 |  |
Financing Receivable, Allowance for Credit Loss | 4,627 | 5,258 |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 9,630 | 3,536 |  |
Financing Receivable, Allowance for Credit Loss | 741 | 0 |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 12,513 | 25,013 |  |
Financing Receivable, Allowance for Credit Loss | 1,723 | 2,890 |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,170 | 3,828 |  |
Financing Receivable, Allowance for Credit Loss | 1,581 | 287 |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,102 | 15,408 |  |
Financing Receivable, Allowance for Credit Loss | 1,323 | 2,081 |  |
Collateral Pledged [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 755 |  |
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 755 |  |

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