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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale [Abstract]
Amortized cost	$ 1,132,569	$ 1,186,649
Gross unrealized gains	1,121	237
Gross unrealized losses	(95,725)	(131,158)
Fair value	1,037,965	1,055,728
Accrued interest receivable on available-for-sale debt securities	4,000	4,600
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	244,685	360,027
Gross unrealized gains	62	84
Gross unrealized losses	(10,134)	(18,616)
Fair value	234,613	341,495
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	302,981	304,588
Gross unrealized gains	110	12
Gross unrealized losses	(39,362)	(51,043)
Fair value	263,729	253,557
Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	554,330	471,000
Gross unrealized gains	900	131
Gross unrealized losses	(46,131)	(61,422)
Fair value	509,099	409,709
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	30,573	51,034
Gross unrealized gains	49	10
Gross unrealized losses	(98)	(77)
Fair value	$ 30,524	$ 50,967

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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).

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