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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | $ 503,404 | $ 569,874 |
Available-for-sale, gross unrealized gains | 1 | 1,275 |
Available-for-sale, gross unrealized losses | (45,757) | (2,894) |
Available-for-sale, fair value | 457,648 | 568,255 |
Allowance for securities credit losses | 0 | 0 |
Amortized Cost | 1,224,564 | 1,143,548 |
Held-to-maturity, gross unrealized losses | 1,244 | 18,967 |
Held-to-maturity, gross unrealized losses | (115,767) | (9,771) |
Debt securities held-to-maturity | 1,110,041 | 1,152,744 |
Allowance for securities credit losses | (1,128) | (1,467) | $ (1,715)
Total, amortized cost | 1,727,968 | 1,713,422 |
Total, gross unrealized gains | 1,245 | 20,242 |
Total, gross unrealized losses | (161,524) | (12,665) |
Total, estimated fair value | 1,567,689 | 1,720,999 |
U.S. government and agency obligations |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 87,648 | 164,756 |
Available-for-sale, gross unrealized gains | 1 | 1,135 |
Available-for-sale, gross unrealized losses | (7,635) | (471) |
Available-for-sale, fair value | 80,014 | 165,420 |
Allowance for securities credit losses | 0 | 0 |
Corporate debt securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 8,928 | 5,000 |
Available-for-sale, gross unrealized gains | 0 | 42 |
Available-for-sale, gross unrealized losses | (756) | (11) |
Available-for-sale, fair value | 8,172 | 5,031 |
Allowance for securities credit losses | 0 | 0 |
Amortized Cost | 56,893 | 68,823 |
Held-to-maturity, gross unrealized losses | 380 | 1,628 |
Held-to-maturity, gross unrealized losses | (3,778) | (1,279) |
Debt securities held-to-maturity | 53,495 | 69,172 |
Allowance for securities credit losses | (1,059) | (1,343) |
Asset-backed securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 296,222 | 298,976 |
Available-for-sale, gross unrealized gains | 0 | 41 |
Available-for-sale, gross unrealized losses | (19,349) | (1,489) |
Available-for-sale, fair value | 276,873 | 297,528 |
Allowance for securities credit losses | 0 | 0 |
Agency commercial MBS |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 110,606 | 101,142 |
Available-for-sale, gross unrealized gains | 0 | 57 |
Available-for-sale, gross unrealized losses | (18,017) | (923) |
Available-for-sale, fair value | 92,589 | 100,276 |
Allowance for securities credit losses | 0 | 0 |
Amortized Cost | 32,127 | 4,385 |
Held-to-maturity, gross unrealized losses | 23 | 7 |
Held-to-maturity, gross unrealized losses | (1,189) | (44) |
Debt securities held-to-maturity | 30,961 | 4,348 |
Allowance for securities credit losses | 0 | 0 |
State, municipal and sovereign debt obligations |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 260,249 | 281,389 |
Held-to-maturity, gross unrealized losses | 46 | 10,185 |
Held-to-maturity, gross unrealized losses | (24,940) | (1,164) |
Debt securities held-to-maturity | 235,355 | 290,410 |
Allowance for securities credit losses | (60) | (85) |
Agency residential |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 849,985 | 756,844 |
Held-to-maturity, gross unrealized losses | 795 | 6,785 |
Held-to-maturity, gross unrealized losses | (83,586) | (7,180) |
Debt securities held-to-maturity | 767,194 | 756,449 |
Allowance for securities credit losses | 0 | 0 |
Non-agency commercial |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 25,310 | 32,107 |
Held-to-maturity, gross unrealized losses | 0 | 362 |
Held-to-maturity, gross unrealized losses | (2,274) | (104) |
Debt securities held-to-maturity | 23,036 | 32,365 |
Allowance for securities credit losses | (9) | (39) |
Total mortgage-backed securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 907,422 | 793,336 |
Held-to-maturity, gross unrealized losses | 818 | 7,154 |
Held-to-maturity, gross unrealized losses | (87,049) | (7,328) |
Debt securities held-to-maturity | 821,191 | 793,162 |
Allowance for securities credit losses | $ (9) | $ (39) |

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