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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,370,927	$ 1,129,057
Gross Unrealized Gains	16,559	23,463
Gross Unrealized Losses	(18,499)	(1,468)
Allowance for credit losses	(78)	(167)
Investment securities	1,368,909	1,150,885
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	280,147	181,087
Gross Unrealized Gains	1,247	1,461
Gross Unrealized Losses	(5,859)	(627)
Investment securities	275,535	181,921
Residential mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	934,615	811,328
Gross Unrealized Gains	9,710	14,506
Gross Unrealized Losses	(11,706)	(833)
Investment securities	932,619	825,001
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	103,230	102,259
Gross Unrealized Gains	4,352	5,872
Gross Unrealized Losses	(453)
Allowance for credit losses	(7)	(18)
Investment securities	107,122	108,113
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,935	34,383
Gross Unrealized Gains	1,250	1,624
Gross Unrealized Losses	(481)	(8)
Allowance for credit losses	(71)	(149)
Investment securities	$ 53,633	$ 35,850

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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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