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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | $ 768,392 | $ 780,079 |  |
Available-for-sale, gross unrealized gains | 1,590 | 194 |  |
Available-for-sale, gross unrealized losses | (25,038) | (26,381) |  |
Available-for-sale, fair value | 744,944 | 753,892 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Held-to-maturity, amortized cost | 1,129,724 | 1,160,868 |  |
Held-to-maturity, gross unrealized gains | 560 | 1,553 |  |
Held-to-maturity, gross unrealized losses | (100,319) | (93,983) |  |
Debt securities held-to-maturity | 1,029,965 | 1,068,438 |  |
Allowance for Securities Credit Losses | (1,058) | (1,133) | $ (1,043) | $ (1,128)
Total, amortized cost | 1,898,116 | 1,940,947 |  |
Total, gross unrealized gains | 2,150 | 1,747 |  |
Total, gross unrealized losses | (125,357) | (120,364) |  |
Total, estimated fair value | 1,774,909 | 1,822,330 |  |
U.S. government and agency obligations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 65,818 | 66,490 |  |
Available-for-sale, gross unrealized gains | 0 | 0 |  |
Available-for-sale, gross unrealized losses | (6,166) | (5,796) |  |
Available-for-sale, fair value | 59,652 | 60,694 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Corporate debt securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 11,831 | 10,096 |  |
Available-for-sale, gross unrealized gains | 17 | 11 |  |
Available-for-sale, gross unrealized losses | (1,178) | (981) |  |
Available-for-sale, fair value | 10,670 | 9,126 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Held-to-maturity, amortized cost | 66,583 | 69,809 |  |
Held-to-maturity, gross unrealized gains | 192 | 391 |  |
Held-to-maturity, gross unrealized losses | (3,543) | (3,941) |  |
Debt securities held-to-maturity | 63,232 | 66,259 |  |
Allowance for Securities Credit Losses | (916) | (987) |  |
Asset-backed securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 289,632 | 295,796 |  |
Available-for-sale, gross unrealized gains | 113 | 0 |  |
Available-for-sale, gross unrealized losses | (1,619) | (4,252) |  |
Available-for-sale, fair value | 288,126 | 291,544 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Agency residential |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 291,759 | 298,107 |  |
Available-for-sale, gross unrealized gains | 1,460 | 183 |  |
Available-for-sale, gross unrealized losses | (12) | (97) |  |
Available-for-sale, fair value | 293,207 | 298,193 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Held-to-maturity, amortized cost | 747,094 | 765,632 |  |
Held-to-maturity, gross unrealized gains | 178 | 901 |  |
Held-to-maturity, gross unrealized losses | (75,407) | (70,040) |  |
Debt securities held-to-maturity | 671,865 | 696,493 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 109,352 | 109,590 |  |
Available-for-sale, gross unrealized gains | 0 | 0 |  |
Available-for-sale, gross unrealized losses | (16,063) | (15,255) |  |
Available-for-sale, fair value | 93,289 | 94,335 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Held-to-maturity, amortized cost | 82,208 | 82,734 |  |
Held-to-maturity, gross unrealized gains | 2 | 10 |  |
Held-to-maturity, gross unrealized losses | (4,312) | (3,678) |  |
Debt securities held-to-maturity | 77,898 | 79,066 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
State, municipal, and sovereign debt obligations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Held-to-maturity, amortized cost | 213,231 | 222,009 |  |
Held-to-maturity, gross unrealized gains | 188 | 251 |  |
Held-to-maturity, gross unrealized losses | (15,535) | (14,550) |  |
Debt securities held-to-maturity | 197,884 | 207,710 |  |
Allowance for Securities Credit Losses | (36) | (39) |  |
Non-agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Held-to-maturity, amortized cost | 20,608 | 20,684 |  |
Held-to-maturity, gross unrealized gains | 0 | 0 |  |
Held-to-maturity, gross unrealized losses | (1,522) | (1,774) |  |
Debt securities held-to-maturity | 19,086 | 18,910 |  |
Allowance for Securities Credit Losses | (106) | (107) |  |
Total mortgage-backed securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 401,111 | 407,697 |  |
Available-for-sale, gross unrealized gains | 1,460 | 183 |  |
Available-for-sale, gross unrealized losses | (16,075) | (15,352) |  |
Available-for-sale, fair value | 386,496 | 392,528 |  |
Allowance for Securities Credit Losses | 0 | 0 |  |
Held-to-maturity, amortized cost | 849,910 | 869,050 |  |
Held-to-maturity, gross unrealized gains | 180 | 911 |  |
Held-to-maturity, gross unrealized losses | (81,241) | (75,492) |  |
Debt securities held-to-maturity | 768,849 | 794,469 |  |
Allowance for Securities Credit Losses | $ (106) | $ (107) |  |

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