Investment Securities - Summary of available-for-sale securities - (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 1,298,651	$ 1,211,353
Available-for-Sale Securities, Gross Unrealized Gains	2,339	9,866
Available-for-Sale Securities, Gross Unrealized Loss	(81,625)	(14,959)
Available-for-Sale Securities, Fair Value	1,219,365	1,206,260
Obligations of U.S. government corporations and agencies [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	174,400	174,644
Available-for-Sale Securities, Gross Unrealized Gains	3	984
Available-for-Sale Securities, Gross Unrealized Loss	(12,970)	(918)
Available-for-Sale Securities, Fair Value	161,433	174,710
Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	215,800	208,281
Available-for-Sale Securities, Gross Unrealized Gains	114	851
Available-for-Sale Securities, Gross Unrealized Loss	(15,090)	(2,381)
Available-for-Sale Securities, Fair Value	200,824	206,751
Collateralized mortgage obligations [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	326,650	264,541
Available-for-Sale Securities, Gross Unrealized Gains		363
Available-for-Sale Securities, Gross Unrealized Loss	(21,122)	(4,736)
Available-for-Sale Securities, Fair Value	305,528	260,168
Asset-backed securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	216,998	221,545
Available-for-Sale Securities, Gross Unrealized Gains	487	610
Available-for-Sale Securities, Gross Unrealized Loss	(4,388)	(1,619)
Available-for-Sale Securities, Fair Value	213,097	220,536
Corporate bonds [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	74,395	70,008
Available-for-Sale Securities, Gross Unrealized Gains	158	1,160
Available-for-Sale Securities, Gross Unrealized Loss	(1,834)	(275)
Available-for-Sale Securities, Fair Value	72,719	70,893
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	290,408	272,334
Available-for-Sale Securities, Gross Unrealized Gains	1,577	5,898
Available-for-Sale Securities, Gross Unrealized Loss	(26,221)	(5,030)
Available-for-Sale Securities, Fair Value	$ 265,764	$ 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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