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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Amortized cost	$ 1,253,750	$ 1,301,244
Gross unrealized gains	374	245
Gross unrealized losses	(142,619)	(137,765)
Fair value	1,111,505	1,163,724
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	367,961	381,268
Gross unrealized gains	115	121
Gross unrealized losses	(27,575)	(26,572)
Fair value	340,501	354,817
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	311,207	313,147
Gross unrealized gains	31	88
Gross unrealized losses	(49,808)	(48,290)
Fair value	261,430	264,945
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	500,922	518,836
Gross unrealized gains	228	36
Gross unrealized losses	(64,774)	(62,136)
Fair value	436,376	456,736
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	73,660	87,993
Gross unrealized gains	0	0
Gross unrealized losses	(462)	(767)
Fair value	$ 73,198	$ 87,226

X

- Definition

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).

+ References

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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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