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Investment Securities - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,873,491 | $ 2,642,667
Gross Unrealized Gains | 643 | 10,968
Gross Unrealized Losses | (98,483) | (29,607)
Allowance for credit losses | (18) | (620)
Investment securities available-for-sale | 1,775,633 | 2,623,408
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,154,216 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (9,711) |
Investment securities, held-to-maturity, fair value | 1,144,505 | 0
Allowance for credit losses | (817) | 0
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,718 | 49,693
Gross Unrealized Gains | 0 | 22
Gross Unrealized Losses | (2,225) | (257)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 47,493 | 49,458
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 744,404 | 629,273
Gross Unrealized Gains | 106 | 736
Gross Unrealized Losses | (37,957) | (7,622)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 706,553 | 622,387
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,062,085 | 1,692,773
Gross Unrealized Gains | 435 | 5,697
Gross Unrealized Losses | (58,095) | (20,797)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 1,004,425 | 1,677,673
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 886,526 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (8,910) |
Investment securities, held-to-maturity, fair value | 877,616 |
Allowance for credit losses | 0 |
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15,284 | 141,916
Gross Unrealized Gains | 102 | 3,865
Gross Unrealized Losses | (206) | (347)
Allowance for credit losses | (1) | (3)
Investment securities available-for-sale | 15,179 | 145,431
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 128,926 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (552) |
Investment securities, held-to-maturity, fair value | 128,374 |
Allowance for credit losses | (16) |
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000 | 129,012
Gross Unrealized Gains | 0 | 648
Gross Unrealized Losses | 0 | (584)
Allowance for credit losses | (17) | (617)
Investment securities available-for-sale | 1,983 | $ 128,459
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 138,764 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (249) |
Investment securities, held-to-maturity, fair value | 138,515 |
Allowance for credit losses | $ (801) |

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