Adoption of New Accounting Standards (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Adoption of New Accounting Standards
Retained earnings	$ (233,760,000)	$ (217,214,000)
Loans, gross	1,742,139,000	1,635,718,000
Allowance for credit losses	39,651,000	40,518,000	$ 40,157,000	$ 39,156,000
Loans, net	1,702,488,000	1,595,200,000
Net deferred tax asset	18,731,000	22,014,000
Total equity	217,516,000	196,233,000	211,024,000	194,471,000
Commercial
Adoption of New Accounting Standards
Allowance for credit losses	12,315,000	11,219,000
Consumer
Adoption of New Accounting Standards
Allowance for credit losses	3,758,000	3,330,000
Consumer finance
Adoption of New Accounting Standards
Loans, gross	468,510,000
Allowance for credit losses	$ 23,578,000	25,969,000	$ 24,791,000	$ 23,513,000
Impact of ASC 326
Adoption of New Accounting Standards
Total equity		(1,072,000)
Accounting Standards Update 2016-13 | Impact of ASC 326
Adoption of New Accounting Standards
Retained earnings		1,100,000
Loans, gross		604,000
Allowance for credit losses		491,000
Loans, net		113,000
Net deferred tax asset		316,000
Reserve for credit losses on unfunded commitments		1,501,000
Total equity		(1,072,000)
Accounting Standards Update 2016-13 | Impact of ASC 326 | Commercial
Adoption of New Accounting Standards
Allowance for credit losses		(22,000)
Accounting Standards Update 2016-13 | Impact of ASC 326 | Consumer
Adoption of New Accounting Standards
Allowance for credit losses		107,000
Accounting Standards Update 2016-13 | Impact of ASC 326 | Consumer finance
Adoption of New Accounting Standards
Allowance for credit losses		406,000
Accounting Standards Update 2016-13 | As Reported under ASC 326
Adoption of New Accounting Standards
Loans, gross		1,636,322,000
Allowance for credit losses		41,009,000
Loans, net		1,595,313,000
Net deferred tax asset		22,330,000
Reserve for credit losses on unfunded commitments		1,501,000
Total equity		195,161,000
Accounting Standards Update 2016-13 | As Reported under ASC 326 | Commercial
Adoption of New Accounting Standards
Allowance for credit losses		11,197,000
Accounting Standards Update 2016-13 | As Reported under ASC 326 | Consumer
Adoption of New Accounting Standards
Allowance for credit losses		3,437,000
Accounting Standards Update 2016-13 | As Reported under ASC 326 | Consumer finance
Adoption of New Accounting Standards
Allowance for credit losses		$ 26,375,000