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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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