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Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	$ 582,987	$ 618,790
Gross unrealized gains, available for sale	9	0
Gross unrealized losses, available for sale	(92,192)	(89,041)
Fair value, available for sale	490,804	529,749
Amortized cost, held to maturity	414,743	425,906
Gross unrealized gains, held to maturity	19	1
Gross unrealized losses, held to maturity	(80,137)	(72,006)
Fair value, held to maturity	334,625	353,901
U.S. Treasury Notes and Bonds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	90,463	90,810
Gross unrealized gains, available for sale	0	0
Gross unrealized losses, available for sale	(13,431)	(12,606)
Fair value, available for sale	77,032	78,204
U.S. Government and Federal Agency [Member]
Debt and Equity Securities, FV-NI [Line Items]
Fair value, available for sale	0
Amortized cost, held to maturity	2,971	2,966
Gross unrealized gains, held to maturity	0	0
Gross unrealized losses, held to maturity	(396)	(421)
Fair value, held to maturity	2,575	2,545
State and Municipal [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	260,976	277,489
Gross unrealized gains, available for sale	0	0
Gross unrealized losses, available for sale	(48,262)	(47,551)
Fair value, available for sale	212,714	229,938
Amortized cost, held to maturity	196,580	201,890
Gross unrealized gains, held to maturity	3	1
Gross unrealized losses, held to maturity	(42,986)	(39,355)
Fair value, held to maturity	153,597	162,536
Mortgage-backed [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	219,113	236,703
Gross unrealized gains, available for sale	9	0
Gross unrealized losses, available for sale	(30,058)	(28,140)
Fair value, available for sale	189,064	208,563
Amortized cost, held to maturity	194,545	200,473
Gross unrealized gains, held to maturity	0	0
Gross unrealized losses, held to maturity	(33,599)	(29,868)
Fair value, held to maturity	160,946	170,605
Corporate [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	760	757
Gross unrealized gains, available for sale	0	0
Gross unrealized losses, available for sale	(51)	(46)
Fair value, available for sale	709	711
Amortized cost, held to maturity	20,005	19,603
Gross unrealized gains, held to maturity	16	0
Gross unrealized losses, held to maturity	(3,117)	(2,285)
Fair value, held to maturity	16,904	17,318
Asset-backed Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	11,675	13,031
Gross unrealized gains, available for sale	0	0
Gross unrealized losses, available for sale	(390)	(698)
Fair value, available for sale	11,285	12,333
Amortized cost, held to maturity	642	974
Gross unrealized gains, held to maturity	0	0
Gross unrealized losses, held to maturity	(39)	(77)
Fair value, held to maturity	$ 603	$ 897

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- 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

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