Investment Securities - Summary of available-for-sale securities - (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 1,211,353	$ 717,562
Available-for-Sale Securities, Gross Unrealized Gains	9,866	19,939
Available-for-Sale Securities, Gross Unrealized Losses	(14,959)	(847)
Available-for-Sale Securities, Fair Value	1,206,260	736,654
Obligations of U.S. government corporations and agencies [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	174,644	39,233
Available-for-Sale Securities, Gross Unrealized Gains	984	1,707
Available-for-Sale Securities, Gross Unrealized Losses	(918)
Available-for-Sale Securities, Fair Value	174,710	40,940
Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	208,281	270,683
Available-for-Sale Securities, Gross Unrealized Gains	851	6,746
Available-for-Sale Securities, Gross Unrealized Losses	(2,381)	(247)
Available-for-Sale Securities, Fair Value	206,751	277,182
Collateralized mortgage obligations [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	264,541	103,532
Available-for-Sale Securities, Gross Unrealized Gains	363	2,927
Available-for-Sale Securities, Gross Unrealized Losses	(4,736)	(160)
Available-for-Sale Securities, Fair Value	260,168	106,299
Asset-backed securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	221,545	30,643
Available-for-Sale Securities, Gross Unrealized Gains	610	1
Available-for-Sale Securities, Gross Unrealized Losses	(1,619)	(98)
Available-for-Sale Securities, Fair Value	220,536	30,546
Corporate bonds [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	70,008	43,826
Available-for-Sale Securities, Gross Unrealized Gains	1,160	489
Available-for-Sale Securities, Gross Unrealized Losses	(275)	(146)
Available-for-Sale Securities, Fair Value	70,893	44,169
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	272,334	229,645
Available-for-Sale Securities, Gross Unrealized Gains	5,898	8,069
Available-for-Sale Securities, Gross Unrealized Losses	(5,030)	(196)
Available-for-Sale Securities, Fair Value	$ 273,202	$ 237,518

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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Amortized cost of 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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