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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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