Investment Securities - Summary of available-for-sale securities - (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 1,107,510	$ 1,220,127
Available-for-Sale Securities, Gross Unrealized Gains	294	609
Available-for-Sale Securities, Gross Unrealized Losses	(161,096)	(180,655)
Available-for-Sale Securities, Fair Value	946,708	1,040,081
Obligations of U.S. government corporations and agencies [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	120,398	117,150
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Losses	(18,800)	(21,241)
Available-for-Sale Securities, Fair Value	101,598	95,909
Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	185,675	200,548
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Losses	(29,167)	(32,959)
Available-for-Sale Securities, Fair Value	156,508	167,589
Collateralized mortgage obligations [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	285,194	299,731
Available-for-Sale Securities, Gross Unrealized Gains	9	0
Available-for-Sale Securities, Gross Unrealized Losses	(49,436)	(49,926)
Available-for-Sale Securities, Fair Value	235,767	249,805
Asset-backed securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	142,215	200,312
Available-for-Sale Securities, Gross Unrealized Gains	270	517
Available-for-Sale Securities, Gross Unrealized Losses	(5,505)	(8,325)
Available-for-Sale Securities, Fair Value	136,980	192,504
Corporate bonds [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	71,092	71,543
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Losses	(8,672)	(7,061)
Available-for-Sale Securities, Fair Value	62,420	64,482
Obligations of states and political subdivisions [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	247,204	274,856
Available-for-Sale Securities, Gross Unrealized Gains	15	92
Available-for-Sale Securities, Gross Unrealized Losses	(42,961)	(53,354)
Available-for-Sale Securities, Fair Value	204,258	221,594
US Treasuries [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	55,732	55,987
Available-for-Sale Securities, Gross Unrealized Gains	0	0
Available-for-Sale Securities, Gross Unrealized Losses	(6,555)	(7,789)
Available-for-Sale Securities, Fair Value	$ 49,177	$ 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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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