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Investment Securities - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,897,985	$ 2,642,667
Gross Unrealized Gains	134	10,968
Gross Unrealized Losses	(142,847)	(29,607)
Allowance for credit losses	(18)	(620)
Investment securities available-for-sale	1,755,254	2,623,408
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,144,458
Gross Unrealized Gains	9
Gross Unrealized Losses	(59,761)
Investment securities, held-to-maturity, fair value	1,084,706	0
Allowance for credit losses	(826)	0
U.S. treasury bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,742	49,693
Gross Unrealized Gains	0	22
Gross Unrealized Losses	(2,661)	(257)
Allowance for credit losses	0	0
Investment securities available-for-sale	47,081	49,458
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	750,903	629,273
Gross Unrealized Gains	4	736
Gross Unrealized Losses	(52,850)	(7,622)
Allowance for credit losses	0	0
Investment securities available-for-sale	698,057	622,387
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	968,589	1,692,773
Gross Unrealized Gains	41	5,697
Gross Unrealized Losses	(82,941)	(20,797)
Allowance for credit losses	0	0
Investment securities available-for-sale	885,689	1,677,673
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	785,857
Gross Unrealized Gains	9
Gross Unrealized Losses	(40,413)
Investment securities, held-to-maturity, fair value	745,453
Allowance for credit losses	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	113,243
Gross Unrealized Gains	26
Gross Unrealized Losses	(3,720)
Allowance for credit losses	0
Investment securities available-for-sale	109,549
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	94,841
Gross Unrealized Gains	0
Gross Unrealized Losses	(6,569)
Investment securities, held-to-maturity, fair value	88,272
Allowance for credit losses	0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,508	141,916
Gross Unrealized Gains	63	3,865
Gross Unrealized Losses	(638)	(347)
Allowance for credit losses	(1)	(3)
Investment securities available-for-sale	12,932	145,431
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	128,509
Gross Unrealized Gains	0
Gross Unrealized Losses	(8,233)
Investment securities, held-to-maturity, fair value	120,276
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	(37)	(584)
Allowance for credit losses	(17)	(617)
Investment securities available-for-sale	1,946	$ 128,459
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	135,251
Gross Unrealized Gains	0
Gross Unrealized Losses	(4,546)
Investment securities, held-to-maturity, fair value	130,705
Allowance for credit losses	$ (810)

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