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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,789,416	$ 1,129,255
Gross Unrealized Gains	14,040	23,463
Gross Unrealized Losses	(16,541)	(1,468)
Allowance for credit losses	(256)	(167)
Investment securities	1,786,659	1,151,083
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,838
Gross Unrealized Gains	16
Investment securities	24,854
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	356,626	181,087
Gross Unrealized Gains	806	1,461
Gross Unrealized Losses	(3,726)	(627)
Investment securities	353,706	181,921
Residential mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,206,867	811,328
Gross Unrealized Gains	8,151	14,506
Gross Unrealized Losses	(11,882)	(833)
Investment securities	1,203,136	825,001
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	119,511	102,259
Gross Unrealized Gains	4,284	5,872
Gross Unrealized Losses	(629)
Allowance for credit losses	(2)	(18)
Investment securities	123,164	108,113
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	81,376	34,383
Gross Unrealized Gains	783	1,624
Gross Unrealized Losses	(304)	(8)
Allowance for credit losses	(254)	(149)
Investment securities	81,601	35,850
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	198	198
Investment securities	$ 198	$ 198

X

- Definition

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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