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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | $ 569,874 | $ 180,154 |
Available-for-sale, gross unrealized gains | 1,275 | 3,154 |
Available-for-sale, gross unrealized losses | (2,894) | (6) |
Available-for-sale, fair value | 568,255 | 183,302 |
Allowance for securities credit losses | 0 | 0 |
Amortized Cost | 1,143,548 | 942,314 |
Held-to-maturity, gross unrealized losses | 18,967 | 29,378 |
Held-to-maturity, gross unrealized losses | (9,771) | (3,226) |
Debt securities held-to-maturity | 1,152,744 | 968,466 |
Allowance for securities credit losses | (1,467) | (1,715) | $ 0
Total, amortized cost | 1,713,422 | 1,122,468 |
Total, gross unrealized gains | 20,242 | 32,532 |
Total, gross unrealized losses | (12,665) | (3,232) |
Total, estimated fair value | 1,720,999 | 1,151,768 |
U.S. government and agency obligations | Investment securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 164,756 | 173,790 |
Available-for-sale, gross unrealized gains | 1,135 | 3,152 |
Available-for-sale, gross unrealized losses | (471) | (2) |
Available-for-sale, fair value | 165,420 | 176,940 |
Allowance for securities credit losses | 0 | 0 |
Corporate debt securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 66,200 |  |
Available-for-sale, fair value | 66,400 |  |
Corporate debt securities | Investment securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 5,000 |  |
Available-for-sale, gross unrealized gains | 42 |  |
Available-for-sale, gross unrealized losses | (11) |  |
Available-for-sale, fair value | 5,031 |  |
Allowance for securities credit losses | 0 |  |
Amortized Cost | 68,823 | 72,305 |
Held-to-maturity, gross unrealized losses | 1,628 | 1,615 |
Held-to-maturity, gross unrealized losses | (1,279) | (2,652) |
Debt securities held-to-maturity | 69,172 | 71,268 |
Allowance for securities credit losses | (1,343) | (1,550) |
Asset-backed securities | Investment securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 298,976 | 6,174 |
Available-for-sale, gross unrealized gains | 41 | 0 |
Available-for-sale, gross unrealized losses | (1,489) | (4) |
Available-for-sale, fair value | 297,528 | 6,170 |
Allowance for securities credit losses | 0 | 0 |
State, municipal, and sovereign debt obligations |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 90,200 |  |
Available-for-sale, fair value | 92,500 |  |
State, municipal, and sovereign debt obligations | Investment securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 281,389 | 238,405 |
Held-to-maturity, gross unrealized losses | 10,185 | 11,500 |
Held-to-maturity, gross unrealized losses | (1,164) | (231) |
Debt securities held-to-maturity | 290,410 | 249,674 |
Allowance for securities credit losses | (85) | (48) |
Mortgage-backed securities: |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 793,336 | 631,604 |
Held-to-maturity, gross unrealized losses | 7,154 | 16,263 |
Held-to-maturity, gross unrealized losses | (7,328) | (343) |
Debt securities held-to-maturity | 793,162 | 647,524 |
Allowance for securities credit losses | (39) | (117) |
Mortgage-backed securities: | Agency residential |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost |  | 190 |
Available-for-sale, gross unrealized gains |  | 2 |
Available-for-sale, gross unrealized losses |  | 0 |
Available-for-sale, fair value |  | 192 |
Allowance for securities credit losses |  | 0 |
Amortized Cost | 756,844 | 593,891 |
Held-to-maturity, gross unrealized losses | 6,785 | 15,037 |
Held-to-maturity, gross unrealized losses | (7,180) | (283) |
Debt securities held-to-maturity | 756,449 | 608,645 |
Allowance for securities credit losses | 0 | 0 |
Mortgage-backed securities: | Agency commercial |  |  |
Securities Financing Transaction [Line Items] |  |  |
Available-for-sale, amortized cost | 101,142 |  |
Available-for-sale, gross unrealized gains | 57 |  |
Available-for-sale, gross unrealized losses | (923) |  |
Available-for-sale, fair value | 100,276 |  |
Allowance for securities credit losses | 0 |  |
Amortized Cost | 4,385 | 5,392 |
Held-to-maturity, gross unrealized losses | 7 | 0 |
Held-to-maturity, gross unrealized losses | (44) | (60) |
Debt securities held-to-maturity | 4,348 | 5,332 |
Allowance for securities credit losses | 0 | 0 |
Mortgage-backed securities: | Non-agency commercial |  |  |
Securities Financing Transaction [Line Items] |  |  |
Amortized Cost | 32,107 | 32,321 |
Held-to-maturity, gross unrealized losses | 362 | 1,226 |
Held-to-maturity, gross unrealized losses | (104) | 0 |
Debt securities held-to-maturity | 32,365 | 33,547 |
Allowance for securities credit losses | $ (39) | $ (117) |

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