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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, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | $ 564,478 | $ 569,874 |  |
Available-for-sale, gross unrealized gains | 206 | 1,275 |  |
Available-for-sale, gross unrealized losses | (18,214) | (2,894) |  |
Available-for-sale, fair value | 546,470 | 568,255 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 1,103,628 | 1,143,548 |  |
Held-to-maturity, gross unrealized gains | 1,786 | 18,967 |  |
Held-to-maturity, gross unrealized losses | (54,522) | (9,771) |  |
Debt securities held-to-maturity | 1,050,892 | 1,152,744 |  |
Allowance for Credit Losses | (1,380) | (1,467) | $ (1,717) | $ (1,715)
Total, amortized cost | 1,668,106 | 1,713,422 |  |
Total, gross unrealized gains | 1,992 | 20,242 |  |
Total, gross unrealized losses | (72,736) | (12,665) |  |
Total, estimated fair value | 1,597,362 | 1,720,999 |  |
U.S. government and agency obligations | Investment securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 145,690 | 164,756 |  |
Available-for-sale, gross unrealized gains | 206 | 1,135 |  |
Available-for-sale, gross unrealized losses | (3,855) | (471) |  |
Available-for-sale, fair value | 142,041 | 165,420 |  |
Allowance for Credit Losses | 0 | 0 |  |
Corporate debt securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 63,100 |  |  |
Available-for-sale, fair value | 61,800 |  |  |
Corporate debt securities | Investment securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 5,000 | 5,000 |  |
Available-for-sale, gross unrealized gains | 0 | 42 |  |
Available-for-sale, gross unrealized losses | (216) | (11) |  |
Available-for-sale, fair value | 4,784 | 5,031 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 64,198 | 68,823 |  |
Held-to-maturity, gross unrealized gains | 917 | 1,628 |  |
Held-to-maturity, gross unrealized losses | (1,951) | (1,279) |  |
Debt securities held-to-maturity | 63,164 | 69,172 |  |
Allowance for Credit Losses | (1,272) | (1,343) |  |
Asset-backed securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 303,400 |  |  |
Asset-backed securities | Investment securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 302,389 | 298,976 |  |
Available-for-sale, gross unrealized gains | 0 | 41 |  |
Available-for-sale, gross unrealized losses | (5,300) | (1,489) |  |
Available-for-sale, fair value | 297,089 | 297,528 |  |
Allowance for Credit Losses | 0 | 0 |  |
State, municipal and sovereign debt obligations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 87,600 |  |  |
Available-for-sale, fair value | 85,400 |  |  |
State, municipal and sovereign debt obligations | Investment securities |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 272,250 | 281,389 |  |
Held-to-maturity, gross unrealized gains | 396 | 10,185 |  |
Held-to-maturity, gross unrealized losses | (12,673) | (1,164) |  |
Debt securities held-to-maturity | 259,973 | 290,410 |  |
Allowance for Credit Losses | (69) | (85) |  |
Mortgage-backed securities: |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 767,180 | 793,336 |  |
Held-to-maturity, gross unrealized gains | 473 | 7,154 |  |
Held-to-maturity, gross unrealized losses | (39,898) | (7,328) |  |
Debt securities held-to-maturity | 727,755 | 793,162 |  |
Allowance for Credit Losses | (39) | (39) |  |
Mortgage-backed securities: | Agency residential |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 730,960 | 756,844 |  |
Held-to-maturity, gross unrealized gains | 467 | 6,785 |  |
Held-to-maturity, gross unrealized losses | (38,828) | (7,180) |  |
Debt securities held-to-maturity | 692,599 | 756,449 |  |
Allowance for Credit Losses | 0 | 0 |  |
Mortgage-backed securities: | Agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Available-for-sale, amortized cost | 111,399 | 101,142 |  |
Available-for-sale, gross unrealized gains | 0 | 57 |  |
Available-for-sale, gross unrealized losses | (8,843) | (923) |  |
Available-for-sale, fair value | 102,556 | 100,276 |  |
Allowance for Credit Losses | 0 | 0 |  |
Amortized Cost | 4,163 | 4,385 |  |
Held-to-maturity, gross unrealized gains | 3 | 7 |  |
Held-to-maturity, gross unrealized losses | (45) | (44) |  |
Debt securities held-to-maturity | 4,121 | 4,348 |  |
Allowance for Credit Losses | 0 | 0 |  |
Mortgage-backed securities: | Non-agency commercial |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Amortized Cost | 32,057 | 32,107 |  |
Held-to-maturity, gross unrealized gains | 3 | 362 |  |
Held-to-maturity, gross unrealized losses | (1,025) | (104) |  |
Debt securities held-to-maturity | 31,035 | 32,365 |  |
Allowance for Credit Losses | $ (39) | $ (39) |  |

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