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Investment Securities - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,873,872 | $ 2,642,667
Gross Unrealized Gains | 35 | 10,968
Gross Unrealized Losses | (224,136) | (29,607)
Allowance for credit losses | (18) | (620)
Investment securities available-for-sale | 1,649,753 | 2,623,408
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,114,886 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (125,885) |
Investment securities, held-to-maturity, fair value | 989,001 | 0
Allowance for credit losses | (802) | 0
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,767 | 49,693
Gross Unrealized Gains | 0 | 22
Gross Unrealized Losses | (3,719) | (257)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 46,048 | 49,458
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 750,997 | 629,273
Gross Unrealized Gains | 15 | 736
Gross Unrealized Losses | (82,684) | (7,622)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 668,328 | 622,387
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 958,800 | 1,692,773
Gross Unrealized Gains | 9 | 5,697
Gross Unrealized Losses | (130,442) | (20,797)
Allowance for credit losses | 0 | 0
Investment securities available-for-sale | 828,367 | 1,677,673
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 761,304 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (87,023) |
Investment securities, held-to-maturity, fair value | 674,281 |
Allowance for credit losses | 0 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 100,278 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (6,106) |
Allowance for credit losses | 0 |
Investment securities available-for-sale | 94,172 |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 92,948 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (11,215) |
Investment securities, held-to-maturity, fair value | 81,733 |
Allowance for credit losses | 0 |
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 12,030 | 141,916
Gross Unrealized Gains | 11 | 3,865
Gross Unrealized Losses | (1,047) | (347)
Allowance for credit losses | (1) | (3)
Investment securities available-for-sale | 10,993 | 145,431
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 128,386 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (15,512) |
Investment securities, held-to-maturity, fair value | 112,874 |
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 | (138) | (584)
Allowance for credit losses | (17) | (617)
Investment securities available-for-sale | 1,845 | $ 128,459
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 132,248 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (12,135) |
Investment securities, held-to-maturity, fair value | 120,113 |
Allowance for credit losses | $ (786) |

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