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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | $ 749,782 |  | $ 847,272 |  |  |
Gross Unrealized Gains | 1,337 |  | 1,545 |  |  |
Gross Unrealized Losses | (15,558) |  | (21,317) |  |  |
Estimated Fair Value | 735,561 |  | 827,500 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 969,778 |  | 1,046,842 |  |  |
Gross Unrealized Gains | 1,473 |  | 1,019 |  |  |
Gross Unrealized Losses | (75,161) |  | (94,944) |  |  |
Estimated Fair Value | 896,090 |  | 952,917 |  |  |
Allowance for Securities Credit Losses | (809) | $ (898) | (967) | $ (958) | $ (1,058) | $ (1,133)
Total, amortized cost | 1,719,560 |  | 1,894,114 |  |  |
Total, gross unrealized gains | 2,810 |  | 2,564 |  |  |
Total, gross unrealized losses | (90,719) |  | (116,261) |  |  |
Total, estimated fair value | 1,631,651 |  | 1,780,417 |  |  |
U.S. government and agency obligations |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 59,254 |  | 62,396 |  |  |
Gross Unrealized Gains | 4 |  | 11 |  |  |
Gross Unrealized Losses | (3,516) |  | (5,022) |  |  |
Estimated Fair Value | 55,742 |  | 57,385 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Corporate debt securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 22,071 |  | 14,042 |  |  |
Gross Unrealized Gains | 295 |  | 43 |  |  |
Gross Unrealized Losses | (278) |  | (762) |  |  |
Estimated Fair Value | 22,088 |  | 13,323 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 55,677 |  | 65,350 |  |  |
Gross Unrealized Gains | 252 |  | 775 |  |  |
Gross Unrealized Losses | (625) |  | (1,416) |  |  |
Estimated Fair Value | 55,304 |  | 64,709 |  |  |
Allowance for Securities Credit Losses | (588) |  | (734) |  |  |
Asset-backed securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 140,653 |  | 197,116 |  |  |
Gross Unrealized Gains | 136 |  | 235 |  |  |
Gross Unrealized Losses | (50) |  | (84) |  |  |
Estimated Fair Value | 140,739 |  | 197,267 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Agency residential |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 419,213 |  | 465,108 |  |  |
Gross Unrealized Gains | 902 |  | 1,256 |  |  |
Gross Unrealized Losses | (753) |  | (801) |  |  |
Estimated Fair Value | 419,362 |  | 465,563 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 633,637 |  | 680,052 |  |  |
Gross Unrealized Gains | 1,065 |  | 44 |  |  |
Gross Unrealized Losses | (55,702) |  | (73,110) |  |  |
Estimated Fair Value | 579,000 |  | 606,986 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Agency commercial |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 108,591 |  | 108,610 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (10,961) |  | (14,648) |  |  |
Estimated Fair Value | 97,630 |  | 93,962 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 79,035 |  | 79,925 |  |  |
Gross Unrealized Gains | 6 |  | 1 |  |  |
Gross Unrealized Losses | (5,487) |  | (5,878) |  |  |
Estimated Fair Value | 73,554 |  | 74,048 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
State and municipal debt obligations |  |  |  |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 183,589 |  | 201,369 |  |  |
Gross Unrealized Gains | 150 |  | 199 |  |  |
Gross Unrealized Losses | (12,958) |  | (13,665) |  |  |
Estimated Fair Value | 170,781 |  | 187,903 |  |  |
Allowance for Securities Credit Losses | (27) |  | (31) |  |  |
Non-agency commercial |  |  |  |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 17,840 |  | 20,146 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (389) |  | (875) |  |  |
Estimated Fair Value | 17,451 |  | 19,271 |  |  |
Allowance for Securities Credit Losses | (194) |  | (202) |  |  |
Total mortgage-backed securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 527,804 |  | 573,718 |  |  |
Gross Unrealized Gains | 902 |  | 1,256 |  |  |
Gross Unrealized Losses | (11,714) |  | (15,449) |  |  |
Estimated Fair Value | 516,992 |  | 559,525 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 730,512 |  | 780,123 |  |  |
Gross Unrealized Gains | 1,071 |  | 45 |  |  |
Gross Unrealized Losses | (61,578) |  | (79,863) |  |  |
Estimated Fair Value | 670,005 |  | 700,305 |  |  |
Allowance for Securities Credit Losses | $ (194) |  | $ (202) |  |  |

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