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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

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