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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,803,898 | $ 2,642,667
Gross Unrealized Gains | 63 | 10,968
Gross Unrealized Losses | (205,278) | (29,607)
Allowance for credit losses | (17) | (620)
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, Amortized cost | 1,094,140 | 0
HTM Allowance for credit losses | (766) | 0
Investment securities held-to-maturity (fair value of $968,707, and $0, net of allowance for credit losses of $766 and $0, as of December 31, 2022 and December 31, 2021, respectively) | 1,093,374 | 0
Gross Unrecognized Gains | 0 |
Gross Unrecognized Losses | (125,433) |
HTM fair value | 968,707 | 0
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,793 | 49,693
Gross Unrealized Gains | 0 | 22
Gross Unrealized Losses | (3,466) | (257)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 46,327 | 49,458
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 747,777 | 629,273
Gross Unrealized Gains | 0 | 736
Gross Unrealized Losses | (78,049) | (7,622)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 669,728 | 622,387
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 937,557 | 1,634,421
Gross Unrealized Gains | 18 | 4,053
Gross Unrealized Losses | (117,072) | (20,447)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 820,503 | 1,618,027
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, Amortized cost | 741,057 |
Gross Unrecognized Gains | 0 |
Gross Unrecognized Losses | (88,390) |
HTM fair value | 652,667 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 56,071 | 58,352
Gross Unrealized Gains | 0 | 1,644
Gross Unrealized Losses | (5,858) | (350)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 50,213 | 59,646
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, Amortized cost | 92,557 |
Gross Unrecognized Gains | 0 |
Gross Unrecognized Losses | (11,993) | (350)
HTM fair value | 80,564 |
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,700 | 141,916
Gross Unrealized Gains | 45 | 3,865
Gross Unrealized Losses | (658) | (347)
Allowance for credit losses | 0 | (3)
Estimated Fair Value | 10,087 | 145,431
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, Amortized cost | 128,273 |
Gross Unrecognized Gains | 0 |
Gross Unrecognized Losses | (12,092) |
HTM fair value | 116,181 |
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000 | 129,012
Gross Unrealized Gains | 0 | 648
Gross Unrealized Losses | (175) | (584)
Allowance for credit losses | (17) | (617)
Estimated Fair Value | 1,808 | 128,459
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, Amortized cost | 132,253 |
Gross Unrecognized Gains | 0 |
Gross Unrecognized Losses | (12,958) |
HTM fair value | 119,295 |
Other Security Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,803,898 | 2,642,667
Estimated Fair Value | $ 1,598,666 | $ 2,623,408

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