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Investments - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale securities:
Amortized cost	$ 472,245	$ 459,537
Gross unrealized gains	2,386	545
Gross unrealized losses	(23,274)	(34,170)
Allowance for credit losses	0	0
Fair value	451,357	425,912
U.S. Agency Securities [Member]
Available-for-sale securities:
Amortized cost	54,652	58,594
Gross unrealized gains	12	6
Gross unrealized losses	(3,247)	(5,113)
Allowance for credit losses	0	0
Fair value	51,417	53,487
U.S. Treasury Securities [Member]
Available-for-sale securities:
Amortized cost	96,467	126,220
Gross unrealized gains	234	6
Gross unrealized losses	(2,774)	(5,724)
Allowance for credit losses	0	0
Fair value	93,927	120,502
Obligations of State and Political Subdivisions [Member]
Available-for-sale securities:
Amortized cost	120,474	103,137
Gross unrealized gains	649	4
Gross unrealized losses	(6,938)	(8,239)
Allowance for credit losses	0	0
Fair value	114,185	94,902
Corporate Obligations [Member]
Available-for-sale securities:
Amortized cost	11,280	11,206
Gross unrealized gains	368	297
Gross unrealized losses	(484)	(1,065)
Allowance for credit losses	0	0
Fair value	11,164	10,438
Mortgage-backed Securities in Government Sponsored Entities [Member]
Available-for-sale securities:
Amortized cost	189,372	160,380
Gross unrealized gains	1,123	232
Gross unrealized losses	(9,831)	(14,029)
Allowance for credit losses	0	0
Fair value	$ 180,664	$ 146,583

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