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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | $ 50,860 |  | $ 51,838 |  |  |
Securities held-to-maturity, Allowance for Credit Losses | (351) | $ (355) | (353) | $ (1,086) | $ (1,089) | $ (1,087)
Securities held-to-maturity, Net Carrying Amount | 50,509 |  | 51,485 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (4,125) |  | (6,767) |  |  |
Securities held-to-maturity, Fair Value | 46,384 |  | 44,718 |  |  |
Total Securities available for sale, before allowance for credit losses | 1,541,505 |  | 1,506,798 |  |  |
Total Securities available for sale, Allowance for Credit Losses | (2,921) | $ (3,066) | (2,627) | $ 0 |  |
Total Securities available for sale, Gross Unrealized Gains | 8,764 |  | 3,069 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (5,925) |  | (9,335) |  |  |
Total Securities available for sale, Fair Value | 1,541,423 |  | 1,497,905 |  |  |
Total other securities |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 640,995 |  | 593,928 |  |  |
Total Securities available for sale, Allowance for Credit Losses | (2,921) |  | (2,627) |  |  |
Total Securities available for sale, Gross Unrealized Gains | 2,651 |  | 1,938 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (5,572) |  | (6,970) |  |  |
Total Securities available for sale, Fair Value | 635,153 |  | 586,269 |  |  |
Municipals |  |  |  |  |  |
Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 43,039 |  | 44,002 |  |  |
Securities held-to-maturity, Allowance for Credit Losses | (351) |  | (353) |  |  |
Securities held-to-maturity, Net Carrying Amount | 42,688 |  | 43,649 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (3,492) |  | (5,834) |  |  |
Securities held-to-maturity, Fair Value | 39,196 |  | 37,815 |  |  |
Total Securities available for sale, before allowance for credit losses | 20,627 |  | 20,627 |  |  |
Total Securities available for sale, Allowance for Credit Losses | (2,921) |  | (2,627) |  |  |
Total Securities available for sale, Gross Unrealized Losses | (428) |  |  |  |  |
Total Securities available for sale, Fair Value | 17,278 |  | 18,000 |  |  |
U.S. government agencies |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 6,836 |  | 8,804 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 24 |  | 77 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (43) |  | (33) |  |  |
Total Securities available for sale, Fair Value | 6,817 |  | 8,848 |  |  |
Corporate |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 201,329 |  | 130,882 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 2,381 |  | 735 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (3,580) |  | (6,368) |  |  |
Total Securities available for sale, Fair Value | 200,130 |  | 125,249 |  |  |
Mutual funds |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 12,502 |  | 11,890 |  |  |
Total Securities available for sale, Fair Value | 12,502 |  | 11,890 |  |  |
Collateralized loan obligations |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 398,210 |  | 420,260 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 246 |  | 1,126 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (1,521) |  | (569) |  |  |
Total Securities available for sale, Fair Value | 396,935 |  | 420,817 |  |  |
Other |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 1,491 |  | 1,465 |  |  |
Total Securities available for sale, Fair Value | 1,491 |  | 1,465 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 900,510 |  | 912,870 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 6,113 |  | 1,131 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (353) |  | (2,365) |  |  |
Total Securities available for sale, Fair Value | 906,270 |  | 911,636 |  |  |
REMIC and CMO |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 698,119 |  | 707,540 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 4,140 |  | 1,107 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (326) |  | (1,067) |  |  |
Total Securities available for sale, Fair Value | 701,933 |  | 707,580 |  |  |
GNMA |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 42,678 |  | 30,099 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 215 |  |  |  |  |
Total Securities available for sale, Gross Unrealized Losses | (20) |  | (154) |  |  |
Total Securities available for sale, Fair Value | 42,873 |  | 29,945 |  |  |
FNMA |  |  |  |  |  |
Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,821 |  | 7,836 |  |  |
Securities held-to-maturity, Net Carrying Amount | 7,821 |  | 7,836 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (633) |  | (933) |  |  |
Securities held-to-maturity, Fair Value | 7,188 |  | 6,903 |  |  |
Total Securities available for sale, before allowance for credit losses | 70,873 |  | 99,183 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 490 |  | 11 |  |  |
Total Securities available for sale, Gross Unrealized Losses | (7) |  | (1,048) |  |  |
Total Securities available for sale, Fair Value | 71,356 |  | 98,146 |  |  |
FHLMC |  |  |  |  |  |
Securities |  |  |  |  |  |
Total Securities available for sale, before allowance for credit losses | 88,840 |  | 76,048 |  |  |
Total Securities available for sale, Gross Unrealized Gains | 1,268 |  | 13 |  |  |
Total Securities available for sale, Gross Unrealized Losses |  |  | (96) |  |  |
Total Securities available for sale, Fair Value | $ 90,108 |  | $ 75,965 |  |  |

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