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Note 5 - Loans - Summary of Collateral Types (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financing receivable, gross | $ 11,880,696 | $ 11,658,829 | [1] |  |
Financing Receivable, Allowance for Credit Loss | 155,892 | 153,317 | [1] | $ 148,964 | $ 146,297
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 2,834,102 | 2,823,986 |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 7,439,688 | 7,251,447 |  |  |
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 1,546,716 | 1,519,619 |  |  |
Financing Receivable, Allowance for Credit Loss | 45,689 | 44,658 |  | 40,483 | 42,889
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 2,377,042 | 2,257,163 |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 1,284,888 | 1,249,938 |  |  |
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 3,777,758 | 3,744,346 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 60,190 | 63,777 |  |  |
Financing Receivable, Allowance for Credit Loss | 1,541 | 1,412 |  | $ 2,430 | $ 1,926
Real Estate [Member] |  |  |  |  |
Financing receivable, gross | 61,435 | 53,205 |  |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 18,467 | 20,266 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 40,826 | 32,794 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 2,142 | 145 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 19,476 | 12,038 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 15,542 | 15,694 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 5,808 | 5,062 |  |  |
Real Estate [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Collateral, Accounts Receivable [Member] |  |  |  |  |
Financing receivable, gross | 3,834 | 7,240 |  |  |
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 3,834 | 7,240 |  |  |
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] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Collateral, Accounts Receivable [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Equipment [Member] |  |  |  |  |
Financing receivable, gross | 3,673 | 2,126 |  |  |
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 3,673 | 2,126 |  |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
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 | 0 | 0 |  |  |
Equipment [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Equipment [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Collateral, Other [Member] |  |  |  |  |
Financing receivable, gross | 30,813 | 26,492 |  |  |
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 29,841 | 24,016 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 0 | 1,498 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 972 | 978 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 0 | 698 |  |  |
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] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 0 | 800 |  |  |
Collateral, Other [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Collateral Pledged [Member] |  |  |  |  |
Financing receivable, gross | 99,755 | 89,063 |  |  |
Financing Receivable, Allowance for Credit Loss | 17,884 | 18,326 |  |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 55,815 | 53,648 |  |  |
Financing Receivable, Allowance for Credit Loss | 15,495 | 16,189 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 40,826 | 34,292 |  |  |
Financing Receivable, Allowance for Credit Loss | 2,389 | 2,136 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 3,114 | 1,123 |  |  |
Financing Receivable, Allowance for Credit Loss | 0 | 1 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 19,476 | 12,736 |  |  |
Financing Receivable, Allowance for Credit Loss | 241 | 475 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 15,542 | 15,694 |  |  |
Financing Receivable, Allowance for Credit Loss | 1,580 | 1,058 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 5,808 | 5,862 |  |  |
Financing Receivable, Allowance for Credit Loss | 568 | 603 |  |  |
Collateral Pledged [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 0 | 0 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0 |  |  |
[1] | derived from audited financial statements.

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