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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Available-for-Sale Securities
Amortized  Cost	$ 515,813		$ 536,334
Gross Unrealized Gains	185		37
Gross Unrealized Losses	(42,923)		(59,258)
Estimated Fair Value	473,075		477,113
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	287,806		302,515
Gross Unrealized Gains	61		54
Gross Unrealized Losses	(21,161)		(28,001)
Estimated Fair Value	266,706		274,568
Allowance for Credit Losses	724	$ 786	1,156	$ 857	$ 1,076	$ 1,051
U.S. Treasury securities
Available-for-Sale Securities
Amortized  Cost	9,995		9,994
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(556)		(936)
Estimated Fair Value	9,439		9,058
Allowance for Credit Losses	0		0
U.S. Government agencies
Available-for-Sale Securities
Amortized  Cost	67		70
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(2)		(5)
Estimated Fair Value	65		65
Allowance for Credit Losses	0		0
Obligations of states and political subdivisions
Available-for-Sale Securities
Amortized  Cost	181,095		183,766
Gross Unrealized Gains	12		0
Gross Unrealized Losses	(16,704)		(19,126)
Estimated Fair Value	164,403		164,640
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	192,272		192,156
Gross Unrealized Gains	61		54
Gross Unrealized Losses	(14,824)		(17,392)
Estimated Fair Value	177,509		174,818
Allowance for Credit Losses	21		12
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Available-for-Sale Securities
Amortized  Cost	69,795		76,732
Gross Unrealized Gains	134		8
Gross Unrealized Losses	(3,267)		(4,438)
Estimated Fair Value	66,662		72,302
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	11,355		11,095
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,631)		(2,100)
Estimated Fair Value	9,724		8,995
Allowance for Credit Losses	0		0
Private label mortgage and asset backed securities
Available-for-Sale Securities
Amortized  Cost	254,400		265,302
Gross Unrealized Gains	6		6
Gross Unrealized Losses	(22,394)		(34,753)
Estimated Fair Value	232,012		230,555
Allowance for Credit Losses	0		0
Held-to-Maturity Securities
Amortized  Cost	51,813		53,066
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3,198)		(5,633)
Estimated Fair Value	48,615		47,433
Allowance for Credit Losses	51		8
Corporate debt securities
Available-for-Sale Securities
Amortized  Cost	461		470
Gross Unrealized Gains	33		23
Gross Unrealized Losses	0		0
Estimated Fair Value	494		493
Allowance for Credit Losses	0
Held-to-Maturity Securities
Amortized  Cost	32,366		46,198
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,508)		(2,876)
Estimated Fair Value	30,858		43,322
Allowance for Credit Losses	$ 652		$ 1,136

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