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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Available-for-Sale Securities
Amortized  Cost	$ 523,679		$ 536,334
Gross Unrealized Gains	105		37
Gross Unrealized Losses	(54,430)		(59,258)
Estimated Fair Value	469,354		477,113
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	292,191		302,515
Gross Unrealized Gains	53		54
Gross Unrealized Losses	(28,561)		(28,001)
Estimated Fair Value	263,683		274,568
Allowance for Credit Losses	786	$ 974	1,156	$ 1,076	$ 894	$ 1,051
U.S. Treasury securities
Available-for-Sale Securities
Amortized  Cost	9,995		9,994
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(651)		(936)
Estimated Fair Value	9,344		9,058
Allowance for Credit Losses	0		0
U.S. Government agencies
Available-for-Sale Securities
Amortized  Cost	68		70
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3)		(5)
Estimated Fair Value	65		65
Allowance for Credit Losses	0		0
Obligations of states and political subdivisions
Available-for-Sale Securities
Amortized  Cost	182,005		183,766
Gross Unrealized Gains	11		0
Gross Unrealized Losses	(22,277)		(19,126)
Estimated Fair Value	159,739		164,640
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	192,202		192,156
Gross Unrealized Gains	53		54
Gross Unrealized Losses	(20,172)		(17,392)
Estimated Fair Value	172,083		174,818
Allowance for Credit Losses	12		12
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Available-for-Sale Securities
Amortized  Cost	77,969		76,732
Gross Unrealized Gains	66		8
Gross Unrealized Losses	(4,041)		(4,438)
Estimated Fair Value	73,994		72,302
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	11,268		11,095
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,777)		(2,100)
Estimated Fair Value	9,491		8,995
Allowance for Credit Losses	0		0
Private label mortgage and asset backed securities
Available-for-Sale Securities
Amortized  Cost	253,182		265,302
Gross Unrealized Gains	5		6
Gross Unrealized Losses	(27,458)		(34,753)
Estimated Fair Value	225,729		230,555
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	52,400		53,066
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(4,261)		(5,633)
Estimated Fair Value	48,139		47,433
Allowance for Credit Losses	7		8
Corporate debt securities
Available-for-Sale Securities
Amortized  Cost	460		470
Gross Unrealized Gains	23		23
Gross Unrealized Losses	0		0
Estimated Fair Value	483		493
Allowance for Credit Losses	0
Held-to-Maturity Securities
Amortized  Cost	36,321		46,198
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(2,351)		(2,876)
Estimated Fair Value	33,970		43,322
Allowance for Credit Losses	$ 767		$ 1,136

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