Investment Securities - Summary of Available-for-Sale Securities - (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 1,138,087	$ 1,220,127
Available-for-Sale Securities, Gross Unrealized Gains	323	609
Available-for-Sale Securities, Gross Unrealized Loss	(177,287)	(180,655)
Available-for-Sale Securities, Fair Value	961,123	1,040,081
Obligations of U.S. government corporations and agencies [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	116,781	117,150
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Loss	(20,605)	(21,241)
Available-for-Sale Securities, Fair Value	96,176	95,909
Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	193,147	200,548
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Loss	(31,948)	(32,959)
Available-for-Sale Securities, Fair Value	161,199	167,589
Collateralized mortgage obligations [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	292,120	299,731
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Loss	(53,127)	(49,926)
Available-for-Sale Securities, Fair Value	238,993	249,805
Asset-backed securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	157,152	200,312
Available-for-Sale Securities, Gross Unrealized Gains	310	517
Available-for-Sale Securities, Gross Unrealized Loss	(6,375)	(8,325)
Available-for-Sale Securities, Fair Value	151,087	192,504
Corporate bonds [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	71,312	71,543
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Loss	(10,772)	(7,061)
Available-for-Sale Securities, Fair Value	60,540	64,482
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	251,715	274,856
Available-for-Sale Securities, Gross Unrealized Gains	13	92
Available-for-Sale Securities, Gross Unrealized Loss	(46,910)	(53,354)
Available-for-Sale Securities, Fair Value	204,818	221,594
US Treasuries [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	55,860	55,987
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Loss	(7,550)	(7,789)
Available-for-Sale Securities, Fair Value	$ 48,310	$ 48,198

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Amount, before tax, of unrealized loss 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).

+ References

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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