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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,642,667	$ 1,129,057
Gross Unrealized Gains	10,968	23,463
Gross Unrealized Losses	(29,607)	(1,468)
Allowance for credit losses	(620)	(167)
Estimated Fair Value	2,623,408	1,150,885
U.S. Treasury Bond
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,693
Gross Unrealized Gains	22
Gross Unrealized Losses	(257)
Allowance for credit losses	0
Estimated Fair Value	49,458
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	629,273	181,087
Gross Unrealized Gains	736	1,461
Gross Unrealized Losses	(7,622)	(627)
Allowance for credit losses	0	0
Estimated Fair Value	622,387	181,921
Residential mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,692,773	811,328
Gross Unrealized Gains	5,697	14,506
Gross Unrealized Losses	(20,797)	(833)
Allowance for credit losses	0
Estimated Fair Value	1,677,673	825,001
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	141,916	102,259
Gross Unrealized Gains	3,865	5,872
Gross Unrealized Losses	(347)	0
Allowance for credit losses	(3)	(18)
Estimated Fair Value	145,431	108,113
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	129,012	34,383
Gross Unrealized Gains	648	1,624
Gross Unrealized Losses	(584)	(8)
Allowance for credit losses	(617)	(149)
Estimated Fair Value	128,459	35,850
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,642,667	1,129,057
Estimated Fair Value	$ 2,623,408	$ 1,150,885

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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