Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized cost	$ 1,362,748	$ 1,430,605
Gross unrealized gains	146	245
Gross unrealized losses	(161,641)	(174,624)
Fair value	1,201,253	1,256,226
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	400,148	418,579
Gross unrealized gains	143	212
Gross unrealized losses	(34,897)	(36,859)
Fair value	365,394	381,932
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	314,048	326,746
Gross unrealized gains	2	32
Gross unrealized losses	(54,225)	(61,676)
Fair value	259,825	265,102
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	558,964	593,917
Gross unrealized gains	1	1
Gross unrealized losses	(71,066)	(73,833)
Fair value	487,899	520,085
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	89,588	91,363
Gross unrealized gains	0	0
Gross unrealized losses	(1,453)	(2,256)
Fair value	$ 88,135	$ 89,107

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

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

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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).

+ 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))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 326
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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
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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