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Note 5 - Loans - Summary of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Total loans | $ 13,311,967 |  | $ 12,605,836 |  |  |
Less allowance for credit losses | (170,235) | $ (169,959) | (164,458) | $ (160,755) | $ (158,092) | $ (153,317)
Net Loans | $ 13,141,732 |  | $ 12,441,378 |  |  |
Financing receivable, gross percentage | 100.00% |  | 100.00% |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Total loans | $ 2,945,784 |  | $ 2,869,894 |  |  |
Financing receivable, gross percentage | 22.13% |  | 22.77% |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |  |
Total loans | $ 8,754,061 |  | $ 8,173,009 |  |  |
Less allowance for credit losses | (66,983) | (68,060) | (67,726) | (64,756) | (59,684) | (55,126)
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |  |
Total loans | 1,532,285 |  | 1,489,306 |  |  |
Less allowance for credit losses | $ (42,080) | (46,423) | $ (38,597) | (37,358) | (40,450) | (44,658)
Financing receivable, gross percentage | 11.51% |  | 11.81% |  |  |
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |
Total loans | $ 2,680,055 |  | $ 2,547,143 |  |  |
Less allowance for credit losses | $ (20,177) | (20,927) | $ (22,302) | (20,003) | (19,039) | (17,702)
Financing receivable, gross percentage | 20.13% |  | 20.21% |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |  |
Total loans | $ 1,625,296 |  | $ 1,444,623 |  |  |
Less allowance for credit losses | $ (15,568) | (14,944) | $ (14,096) | (14,710) | (13,629) | (12,029)
Financing receivable, gross percentage | 12.21% |  | 11.46% |  |  |
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |  |  |
Total loans | $ 4,448,710 |  | $ 4,181,243 |  |  |
Less allowance for credit losses | $ (31,238) | (32,189) | $ (31,328) | (30,043) | (27,016) | (25,395)
Financing receivable, gross percentage | 33.42% |  | 33.17% |  |  |
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |  |
Total loans |  |  | $ 8,173,009 |  |  |
Financing receivable, gross percentage | 65.76% |  | 64.84% |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Total loans | $ 79,837 |  | $ 73,627 |  |  |
Less allowance for credit losses | $ (3,075) | $ (2,454) | $ (2,805) | $ (1,603) | $ (1,742) | $ (1,412)
Financing receivable, gross percentage | 0.60% |  | 0.58% |  |  |

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