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Note 3 - Loans - Summary of Collateral Types (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financing receivable, gross | $ 11,658,829 | $ 11,687,968 | [1] |  |
Financing Receivable, Allowance for Credit Loss | 153,317 | 146,297 | [1] | $ 116,660 | $ 87,942
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 2,823,986 | 3,145,317 |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 7,251,447 | 6,943,861 |  |  |
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 1,519,619 | 1,532,388 |  |  |
Financing Receivable, Allowance for Credit Loss | 44,658 | 42,889 |  | $ 26,994 | $ 16,057
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 2,257,163 | 2,199,280 |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 1,249,938 | 1,146,831 |  |  |
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 3,744,346 | 3,597,750 |  |  |
Real Estate [Member] |  |  |  |  |
Financing receivable, gross | 54,005 | 44,205 |  |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 20,266 | 20,061 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 33,594 | 24,144 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 145 | 0 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 12,038 | 8,573 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 15,694 | 3,260 |  |  |
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 5,862 | 12,311 |  |  |
Collateral, Accounts Receivable [Member] |  |  |  |  |
Financing receivable, gross | 7,240 | 12,092 |  |  |
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 7,240 | 12,092 |  |  |
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 |  |  |
Equipment [Member] |  |  |  |  |
Financing receivable, gross | 2,126 | 837 |  |  |
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 2,126 | 837 |  |  |
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 |  |  |
Collateral, Other [Member] |  |  |  |  |
Financing receivable, gross | 25,692 | 26,270 |  |  |
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 24,016 | 24,998 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 698 | 74 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 978 | 1,198 |  |  |
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 698 | 74 |  |  |
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 | 0 |  |  |
Collateral Pledged [Member] |  |  |  |  |
Financing receivable, gross | 89,063 | 83,404 |  |  |
Financing Receivable, Allowance for Credit Loss | 18,326 | 10,387 |  |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing receivable, gross | 53,648 | 57,988 |  |  |
Financing Receivable, Allowance for Credit Loss | 16,189 | 9,910 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] |  |  |  |  |
Financing receivable, gross | 34,292 | 24,218 |  |  |
Financing Receivable, Allowance for Credit Loss | 2,136 | 470 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |
Financing receivable, gross | 1,123 | 1,198 |  |  |
Financing Receivable, Allowance for Credit Loss | 1 | 7 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |
Financing receivable, gross | 12,736 | 8,647 |  |  |
Financing Receivable, Allowance for Credit Loss | 475 | 154 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |
Financing receivable, gross | 15,694 | 3,260 |  |  |
Financing Receivable, Allowance for Credit Loss | 1,058 | 316 |  |  |
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |
Financing receivable, gross | 5,862 | 12,311 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 603 | $ 0 |  |  |
[1] | derived from audited financial statements.

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