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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.

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