Investment Securities - Summary of available-for-sale securities - (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 1,272,965	$ 1,211,353
Available-for-Sale Securities, Gross Unrealized Gains	1,015	9,866
Available-for-Sale Securities, Gross Unrealized Loss	(133,514)	(14,959)
Available-for-Sale Securities, Fair Value	1,140,466	1,206,260
Obligations of U.S. government corporations and agencies [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	174,154	174,644
Available-for-Sale Securities, Gross Unrealized Gains		984
Available-for-Sale Securities, Gross Unrealized Loss	(21,132)	(918)
Available-for-Sale Securities, Fair Value	153,022	174,710
Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	209,527	208,281
Available-for-Sale Securities, Gross Unrealized Gains	14	851
Available-for-Sale Securities, Gross Unrealized Loss	(24,145)	(2,381)
Available-for-Sale Securities, Fair Value	185,396	206,751
Collateralized mortgage obligations [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	315,850	264,541
Available-for-Sale Securities, Gross Unrealized Gains		363
Available-for-Sale Securities, Gross Unrealized Loss	(33,862)	(4,736)
Available-for-Sale Securities, Fair Value	281,988	260,168
Asset-backed securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	212,019	221,545
Available-for-Sale Securities, Gross Unrealized Gains	620	610
Available-for-Sale Securities, Gross Unrealized Loss	(7,657)	(1,619)
Available-for-Sale Securities, Fair Value	204,982	220,536
Corporate bonds [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	74,283	70,008
Available-for-Sale Securities, Gross Unrealized Gains	21	1,160
Available-for-Sale Securities, Gross Unrealized Loss	(3,392)	(275)
Available-for-Sale Securities, Fair Value	70,912	70,893
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	287,132	272,334
Available-for-Sale Securities, Gross Unrealized Gains	360	5,898
Available-for-Sale Securities, Gross Unrealized Loss	(43,326)	(5,030)
Available-for-Sale Securities, Fair Value	$ 244,166	$ 273,202

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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