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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Debt securities, amortized cost	$ 716,515		$ 740,468
Gross Unrealized Gains	15		18
Gross Unrealized Losses	(85,006)		(91,661)
Debt Securities, Available-for-sale	631,524		648,825
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	304,528
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	303,844		305,107
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	68		67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(27,963)		(33,925)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	276,633		271,249
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Held-to-maturity investment securities	276,633
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(684)
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt securities, amortized cost	106		107
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(8)		(9)
Debt Securities, Available-for-sale	98		98
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
U.S. Treasury securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	9,990		9,990
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,111)		(1,283)
Debt Securities, Available-for-sale	8,879		8,707
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, amortized cost	200,915		201,638
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(22,864)		(26,653)
Debt Securities, Available-for-sale	178,051		174,985
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	192,028
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date			192,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	68		67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(17,529)		(23,166)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value			168,905
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Held-to-maturity investment securities	174,567
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt securities, amortized cost	99,307		117,292
Gross Unrealized Gains	4		4
Gross Unrealized Losses	(6,680)		(7,803)
Debt Securities, Available-for-sale	92,631		109,493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	10,511
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date			10,430
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,559)		(1,762)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	8,952		8,668
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Held-to-maturity investment securities	8,952
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	406,197		411,441
Gross Unrealized Gains	11		14
Gross Unrealized Losses	(54,343)		(55,913)
Debt Securities, Available-for-sale	351,865		355,542
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	55,981
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date			56,691
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,919)		(5,931)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	50,062		50,760
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Held-to-maturity investment securities	50,062
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(260)	$ (231)
Corporate debt securities
Schedule of Available-for-sale Securities
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	46,008
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date			45,982
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2,956)		(3,066)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	43,052		$ 42,916
Held-to-maturity investment securities	43,052
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ (424)	$ (545)

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