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Note 5 - Loans - Summary of Collateral Types (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Owner-occupied commercial | $ 12,332,780 |  | $ 11,658,829 |  |  |
Financing Receivable, Allowance for Credit Loss | 158,092 | $ 155,892 | 153,317 | $ 152,272 | $ 148,965 | $ 146,297
Real Estate [Member] |  |  |  |  |  |
Owner-occupied commercial | 58,391 |  | 53,205 |  |  |
Collateral, Accounts Receivable [Member] |  |  |  |  |  |
Owner-occupied commercial | 4,003 |  | 7,240 |  |  |
Equipment [Member] |  |  |  |  |  |
Owner-occupied commercial | 4,708 |  | 2,126 |  |  |
Collateral, Other [Member] |  |  |  |  |  |
Owner-occupied commercial | 36,155 |  | 26,492 |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Owner-occupied commercial | 103,257 |  | 89,063 |  |  |
Financing Receivable, Allowance for Credit Loss | 19,764 |  | 18,326 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Owner-occupied commercial | 2,935,577 |  | 2,823,986 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |
Owner-occupied commercial | 19,482 |  | 20,266 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Collateral, Accounts Receivable [Member] |  |  |  |  |  |
Owner-occupied commercial | 4,003 |  | 7,240 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Equipment [Member] |  |  |  |  |  |
Owner-occupied commercial | 3,852 |  | 2,126 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member] |  |  |  |  |  |
Owner-occupied commercial | 34,354 |  | 24,016 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |  |  |  |
Owner-occupied commercial | 61,691 |  | 53,648 |  |  |
Financing Receivable, Allowance for Credit Loss | 19,044 |  | 16,189 |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 7,822,079 |  | 7,251,447 |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 55,126 |  |  |
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 1,510,677 |  | 1,519,619 |  |  |
Financing Receivable, Allowance for Credit Loss | 40,450 | 45,689 | 44,658 | 40,443 | 40,483 | 42,889
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 2,399,644 |  | 2,257,163 |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 1,350,428 |  | 1,249,938 |  |  |
Real Estate Portfolio Segment[Member] | Real Estate [Member] |  |  |  |  |  |
Owner-occupied commercial | 36,909 |  | 32,794 |  |  |
Real Estate Portfolio Segment[Member] | Real Estate [Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 2,000 |  | 145 |  |  |
Real Estate Portfolio Segment[Member] | Real Estate [Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 17,288 |  | 12,038 |  |  |
Real Estate Portfolio Segment[Member] | Real Estate [Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 14,784 |  | 15,694 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Accounts Receivable [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Accounts Receivable [Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Accounts Receivable [Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Accounts Receivable [Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Equipment [Member] |  |  |  |  |  |
Owner-occupied commercial | 854 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Equipment [Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Equipment [Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Equipment [Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Other [Member] |  |  |  |  |  |
Owner-occupied commercial | 779 |  | 1,498 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Other [Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 972 |  | 978 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Other [Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 698 |  |  |
Real Estate Portfolio Segment[Member] | Collateral, Other [Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Real Estate Portfolio Segment[Member] | Collateral Pledged [Member] |  |  |  |  |  |
Owner-occupied commercial | 38,542 |  | 34,292 |  |  |
Financing Receivable, Allowance for Credit Loss | 670 |  | 2,136 |  |  |
Real Estate Portfolio Segment[Member] | Collateral Pledged [Member] | Construction Loans [Member] |  |  |  |  |  |
Owner-occupied commercial | 2,972 |  | 1,123 |  |  |
Financing Receivable, Allowance for Credit Loss | 0 |  | 1 |  |  |
Real Estate Portfolio Segment[Member] | Collateral Pledged [Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Owner-occupied commercial | 17,288 |  | 12,736 |  |  |
Financing Receivable, Allowance for Credit Loss | 0 |  | 475 |  |  |
Real Estate Portfolio Segment[Member] | Collateral Pledged [Member] | One to Four Family [Member] |  |  |  |  |  |
Owner-occupied commercial | 14,784 |  | 15,694 |  |  |
Financing Receivable, Allowance for Credit Loss | 83 |  | 1,058 |  |  |
Other Mortgages [Member] | Real Estate [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 4,837 |  | 5,062 |  |  |
Other Mortgages [Member] | Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Other Mortgages [Member] | Equipment [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 854 |  | 0 |  |  |
Other Mortgages [Member] | Collateral, Other [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 779 |  | 800 |  |  |
Other Mortgages [Member] | Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Owner-occupied commercial | 6,470 |  | 5,862 |  |  |
Financing Receivable, Allowance for Credit Loss | 587 |  | 603 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Owner-occupied commercial | 64,447 |  | 63,777 |  |  |
Financing Receivable, Allowance for Credit Loss | 1,742 | $ 1,541 | 1,412 | $ 2,127 | $ 2,430 | $ 1,926
Consumer Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Collateral, Accounts Receivable [Member] |  |  |  |  |  |
Owner-occupied commercial | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Equipment [Member] |  |  |  |  |  |
Owner-occupied commercial | 2 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Collateral, Other [Member] |  |  |  |  |  |
Owner-occupied commercial | 50 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |  |  |  |
Owner-occupied commercial | 52 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 50 |  | $ 0 |  |  |

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