Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,803,898	$ 2,642,667
Gross Unrealized Gains	63	10,968
Gross Unrealized Losses	(205,278)	(29,607)
Allowance for credit losses	(17)	(620)
Schedule of Held-to-Maturity Securities [Line Items]
HTM, Amortized cost	1,094,140	0
HTM Allowance for credit losses	(766)	0
Investment securities held-to-maturity (fair value of $968,707, and $0, net of allowance for credit losses of $766 and $0, as of December 31, 2022 and December 31, 2021, respectively)	1,093,374	0
Gross Unrecognized Gains	0
Gross Unrecognized Losses	(125,433)
HTM fair value	968,707	0
U.S. treasury bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,793	49,693
Gross Unrealized Gains	0	22
Gross Unrealized Losses	(3,466)	(257)
Allowance for credit losses	0	0
Estimated Fair Value	46,327	49,458
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	747,777	629,273
Gross Unrealized Gains	0	736
Gross Unrealized Losses	(78,049)	(7,622)
Allowance for credit losses	0	0
Estimated Fair Value	669,728	622,387
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	937,557	1,634,421
Gross Unrealized Gains	18	4,053
Gross Unrealized Losses	(117,072)	(20,447)
Allowance for credit losses	0	0
Estimated Fair Value	820,503	1,618,027
Schedule of Held-to-Maturity Securities [Line Items]
HTM, Amortized cost	741,057
Gross Unrecognized Gains	0
Gross Unrecognized Losses	(88,390)
HTM fair value	652,667
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56,071	58,352
Gross Unrealized Gains	0	1,644
Gross Unrealized Losses	(5,858)	(350)
Allowance for credit losses	0	0
Estimated Fair Value	50,213	59,646
Schedule of Held-to-Maturity Securities [Line Items]
HTM, Amortized cost	92,557
Gross Unrecognized Gains	0
Gross Unrecognized Losses	(11,993)	(350)
HTM fair value	80,564
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,700	141,916
Gross Unrealized Gains	45	3,865
Gross Unrealized Losses	(658)	(347)
Allowance for credit losses	0	(3)
Estimated Fair Value	10,087	145,431
Schedule of Held-to-Maturity Securities [Line Items]
HTM, Amortized cost	128,273
Gross Unrecognized Gains	0
Gross Unrecognized Losses	(12,092)
HTM fair value	116,181
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,000	129,012
Gross Unrealized Gains	0	648
Gross Unrealized Losses	(175)	(584)
Allowance for credit losses	(17)	(617)
Estimated Fair Value	1,808	128,459
Schedule of Held-to-Maturity Securities [Line Items]
HTM, Amortized cost	132,253
Gross Unrecognized Gains	0
Gross Unrecognized Losses	(12,958)
HTM fair value	119,295
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,803,898	2,642,667
Estimated Fair Value	$ 1,598,666	$ 2,623,408