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Note 3 - Loans - Loans by Performance Status (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing receivable, gross | $ 12,605,836 | $ 11,658,829
Performing Financial Instruments [Member] |  |
Financing receivable, gross | 12,563,370 | 11,637,296
Nonperforming Financial Instruments [Member] |  |
Financing receivable, gross | 42,466 | 21,533
Commercial Real Estate Portfolio Segment [Member] |  |
Financing receivable, gross | 2,869,894 | 2,823,986
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Financing receivable, gross | 2,844,164 | 2,816,599
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing receivable, gross | 25,730 | 7,387
Real Estate Portfolio Segment[Member] |  |
Financing receivable, gross | 8,173,009 | 7,251,447
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |
Financing receivable, gross | 1,489,306 | 1,519,619
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |
Financing receivable, gross | 2,547,143 | 2,257,163
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |
Financing receivable, gross | 1,444,623 | 1,249,938
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |
Financing receivable, gross | 4,181,243 | 3,744,346
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |
Financing receivable, gross | 8,173,009 |
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] |  |
Financing receivable, gross |  | 7,237,517
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] | Construction Loans [Member] |  |
Financing receivable, gross | 1,488,645 | 1,519,508
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] | Owner Occupied Commercial [Member] |  |
Financing receivable, gross | 2,538,399 | 2,250,074
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] | One to Four Family [Member] |  |
Financing receivable, gross | 1,439,332 | 1,243,603
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] | Non-owner Occupied Commercial [Member] |  |
Financing receivable, gross | 4,179,984 | 3,743,840
Real Estate Portfolio Segment[Member] | Performing Financial Instruments [Member] | Other Mortgages [Member] |  |
Financing receivable, gross | 8,157,715 |
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] |  |
Financing receivable, gross |  | 13,930
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |
Financing receivable, gross | 661 | 111
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] | Owner Occupied Commercial [Member] |  |
Financing receivable, gross | 8,744 | 7,089
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] | One to Four Family [Member] |  |
Financing receivable, gross | 5,291 | 6,335
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] | Non-owner Occupied Commercial [Member] |  |
Financing receivable, gross | 1,259 | 506
Real Estate Portfolio Segment[Member] | Nonperforming Financial Instruments [Member] | Other Mortgages [Member] |  |
Financing receivable, gross | 15,294 |
Consumer Portfolio Segment [Member] |  |
Financing receivable, gross | 73,627 | 63,777
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Financing receivable, gross | 72,846 | 63,672
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing receivable, gross | $ 781 | $ 105

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