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Note 5 - Loans - Summary of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Total loans | $ 12,338,226 |  | $ 11,658,829 | [1] |  |  |
Less allowance for credit losses | (160,755) | $ (158,092) | (153,317) | [1] | $ (152,247) | $ (152,272) | $ (146,297)
Net Loans | $ 12,177,471 |  | $ 11,505,512 | [1] |  |  |
Financing receivable, gross percentage | 100.00% |  | 100.00% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Total loans | $ 2,793,989 |  | $ 2,823,986 |  |  |  |
Financing receivable, gross percentage | 22.64% |  | 24.22% |  |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |  |  |
Total loans | $ 8,042,603 |  | $ 7,251,447 |  |  |  |
Financing receivable, gross percentage | 65.18% |  | 62.20% |  |  |  |
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |  |  |
Total loans | $ 1,439,648 |  | $ 1,519,619 |  |  |  |
Less allowance for credit losses | $ (37,358) | (40,450) | $ (44,658) |  | (38,023) | (40,443) | (42,889)
Financing receivable, gross percentage | 11.67% |  | 13.03% |  |  |  |
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |  |
Total loans | $ 2,441,687 |  | $ 2,257,163 |  |  |  |
Financing receivable, gross percentage | 19.79% |  | 19.36% |  |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |  |  |
Total loans | $ 1,409,981 |  | $ 1,249,938 |  |  |  |
Financing receivable, gross percentage | 11.43% |  | 10.72% |  |  |  |
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |  |  |
Total loans | $ 4,190,935 |  | $ 3,744,346 |  |  |  |
Financing receivable, gross percentage | 33.97% |  | 32.12% |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Total loans | $ 61,986 |  | $ 63,777 |  |  |  |
Less allowance for credit losses | $ (1,603) | $ (1,742) | $ (1,412) |  | $ (1,989) | $ (2,127) | $ (1,926)
Financing receivable, gross percentage | 0.50% |  | 0.55% |  |  |  |
[1] | Derived from audited financial statements.

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