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Note 5 - Loans - Summary of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Total loans | $ 13,232,560 |  | $ 12,605,836 | [1] |  |  |
Less allowance for credit losses | (169,959) | $ (165,034) | (164,458) | [1] | $ (158,092) | $ (155,892) | $ (153,317)
Net Loans | $ 13,062,601 |  | $ 12,441,378 | [1] |  |  |
Financing receivable, gross percentage | 100.00% |  | 100.00% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Total loans | $ 2,966,191 |  | $ 2,869,894 |  |  |  |
Financing receivable, gross percentage | 22.42% |  | 22.77% |  |  |  |
Real Estate Portfolio Segment[Member] |  |  |  |  |  |  |
Total loans | $ 8,457,869 |  | $ 8,173,009 |  |  |  |
Less allowance for credit losses | (68,060) | (68,429) | (67,726) |  | (59,684) | (57,640) | (55,126)
Real Estate Portfolio Segment[Member] | Construction Loans [Member] |  |  |  |  |  |  |
Total loans | 1,735,405 |  | 1,489,306 |  |  |  |
Less allowance for credit losses | $ (46,423) | (41,809) | $ (38,597) |  | (40,450) | (45,689) | (44,658)
Financing receivable, gross percentage | 13.11% |  | 11.81% |  |  |  |
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member] |  |  |  |  |  |  |
Total loans | $ 2,557,711 |  | $ 2,547,143 |  |  |  |
Less allowance for credit losses | $ (20,927) | (21,330) | $ (22,302) |  | (19,039) | (18,391) | (17,702)
Financing receivable, gross percentage | 19.33% |  | 20.21% |  |  |  |
Real Estate Portfolio Segment[Member] | One to Four Family [Member] |  |  |  |  |  |  |
Total loans | $ 1,561,461 |  | $ 1,444,623 |  |  |  |
Less allowance for credit losses | $ (14,944) | (15,246) | $ (14,096) |  | (13,629) | (12,994) | (12,029)
Financing receivable, gross percentage | 11.80% |  | 11.46% |  |  |  |
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member] |  |  |  |  |  |  |
Total loans | $ 4,338,697 |  | $ 4,181,243 |  |  |  |
Less allowance for credit losses | $ (32,189) | (31,853) | $ (31,328) |  | (27,016) | (26,255) | (25,395)
Financing receivable, gross percentage | 32.79% |  | 33.17% |  |  |  |
Real Estate Portfolio Segment[Member] | Other Mortgages [Member] |  |  |  |  |  |  |
Total loans |  |  | $ 8,173,009 |  |  |  |
Financing receivable, gross percentage | 63.92% |  | 64.84% |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Total loans | $ 73,095 |  | $ 73,627 |  |  |  |
Less allowance for credit losses | $ (2,454) | $ (2,278) | $ (2,805) |  | $ (1,742) | $ (1,541) | $ (1,412)
Financing receivable, gross percentage | 0.55% |  | 0.58% |  |  |  |
[1] | Derived from audited financial statements.

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