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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | $ 489,939 | $ 503,404 |  |
Available-for-sale, gross unrealized gains | 4 | 1 |  |
Available-for-sale, gross unrealized losses | (37,748) | (45,757) |  |
Available-for-sale, fair value | 452,195 | 457,648 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 1,248,630 | 1,224,564 |  |
Held-to-maturity, gross unrealized gains | 2,547 | 1,244 |  |
Held-to-maturity, gross unrealized losses | (101,504) | (115,767) |  |
Debt securities held-to-maturity | 1,149,673 | 1,110,041 |  |
Allowance for Credit Losses | (1,043) | (1,128) | $ (1,380) | $ (1,467)
Total, amortized cost | 1,738,569 | 1,727,968 |  |
Total, gross unrealized gains | 2,551 | 1,245 |  |
Total, gross unrealized losses | (139,252) | (161,524) |  |
Total, estimated fair value | 1,601,868 | 1,567,689 |  |
U.S. government and agency obligations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 73,305 | 87,648 |  |
Available-for-sale, gross unrealized gains | 4 | 1 |  |
Available-for-sale, gross unrealized losses | (6,643) | (7,635) |  |
Available-for-sale, fair value | 66,666 | 80,014 |  |
Allowance for Credit Losses | 0 | 0 |  |
Corporate debt securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 10,077 | 8,928 |  |
Available-for-sale, gross unrealized gains | 0 | 0 |  |
Available-for-sale, gross unrealized losses | (616) | (756) |  |
Available-for-sale, fair value | 9,461 | 8,172 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 54,930 | 56,893 |  |
Held-to-maturity, gross unrealized gains | 42 | 380 |  |
Held-to-maturity, gross unrealized losses | (4,171) | (3,778) |  |
Debt securities held-to-maturity | 50,801 | 53,495 |  |
Allowance for Credit Losses | (976) | (1,059) |  |
Asset-backed securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 296,217 | 296,222 |  |
Available-for-sale, gross unrealized gains | 0 | 0 |  |
Available-for-sale, gross unrealized losses | (14,448) | (19,349) |  |
Available-for-sale, fair value | 281,769 | 276,873 |  |
Allowance for Credit Losses | 0 | 0 |  |
Agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 110,340 | 110,606 |  |
Available-for-sale, gross unrealized gains | 0 | 0 |  |
Available-for-sale, gross unrealized losses | (16,041) | (18,017) |  |
Available-for-sale, fair value | 94,299 | 92,589 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 31,887 | 32,127 |  |
Held-to-maturity, gross unrealized gains | 90 | 23 |  |
Held-to-maturity, gross unrealized losses | (553) | (1,189) |  |
Debt securities held-to-maturity | 31,424 | 30,961 |  |
Allowance for Credit Losses | 0 | 0 |  |
State, municipal and sovereign debt obligations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 254,311 | 260,249 |  |
Held-to-maturity, gross unrealized gains | 104 | 46 |  |
Held-to-maturity, gross unrealized losses | (19,342) | (24,940) |  |
Debt securities held-to-maturity | 235,073 | 235,355 |  |
Allowance for Credit Losses | (56) | (60) |  |
Agency residential |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 882,211 | 849,985 |  |
Held-to-maturity, gross unrealized gains | 2,311 | 795 |  |
Held-to-maturity, gross unrealized losses | (75,309) | (83,586) |  |
Debt securities held-to-maturity | 809,213 | 767,194 |  |
Allowance for Credit Losses | 0 | 0 |  |
Non-agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 25,291 | 25,310 |  |
Held-to-maturity, gross unrealized gains | 0 | 0 |  |
Held-to-maturity, gross unrealized losses | (2,129) | (2,274) |  |
Debt securities held-to-maturity | 23,162 | 23,036 |  |
Allowance for Credit Losses | (11) | (9) |  |
Total mortgage-backed securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 939,389 | 907,422 |  |
Held-to-maturity, gross unrealized gains | 2,401 | 818 |  |
Held-to-maturity, gross unrealized losses | (77,991) | (87,049) |  |
Debt securities held-to-maturity | 863,799 | 821,191 |  |
Allowance for Credit Losses | $ (11) | $ (9) |  |

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