Fair Value Measurements - Carrying value and estimated fair value of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities:
Equity securities, at fair value	$ 2,443	$ 2,115
Restricted securities, at cost	5,007	4,425
Carrying Value
Assets:
Cash and cash equivalents	192,656	61,599
Securities:
Available-for-sale	169,084	357,576
Held-to-maturity	96,347	99,415
Equity securities, at fair value	2,443	2,115
Restricted securities, at cost	5,007	4,425
Loans, net	1,800,096	1,769,300
Derivative assets, at fair value	1,390	1,217
Mortgage servicing rights	9
Bank owned life insurance		21,170
Accrued interest receivable	5,701	5,531
Liabilities:
Deposits	1,981,623	2,067,740
Federal Reserve Bank borrowings	54,000
Subordinated debt	24,687	24,624
Federal funds purchased		25,500
Derivative liabilities, at fair value	1,390	1,217
Accrued interest payable	2,610	1,035
Fair Value
Assets:
Cash and cash equivalents	192,656	61,599
Securities:
Available-for-sale	169,084	357,576
Held-to-maturity	75,733	81,161
Equity securities, at fair value	2,443	2,115
Restricted securities, at cost	5,007	4,425
Loans, net	1,660,836	1,676,887
Derivative assets, at fair value	1,390	1,217
Mortgage servicing rights	9
Bank owned life insurance		21,170
Accrued interest receivable	5,701	5,531
Liabilities:
Deposits	1,977,757	2,065,248
Federal Reserve Bank borrowings	54,000
Subordinated debt	21,269	22,457
Federal funds purchased		25,500
Derivative liabilities, at fair value	1,390	1,217
Accrued interest payable	2,610	1,035
Fair Value, Inputs, Level 1 | Fair Value
Assets:
Cash and cash equivalents	192,656	61,599
Securities:
Equity securities, at fair value	2,443	2,115
Fair Value, Inputs, Level 2 | Fair Value
Securities:
Available-for-sale	169,084	357,576
Held-to-maturity	75,733	81,161
Restricted securities, at cost	5,007	4,425
Derivative assets, at fair value	1,390	1,217
Bank owned life insurance		21,170
Accrued interest receivable	5,701	5,531
Liabilities:
Deposits	1,977,757	2,065,248
Federal Reserve Bank borrowings	54,000
Federal funds purchased		25,500
Derivative liabilities, at fair value	1,390	1,217
Accrued interest payable	2,610	1,035
Fair Value, Inputs, Level 3 | Fair Value
Securities:
Loans, net	1,660,836	1,676,887
Mortgage servicing rights	9
Liabilities:
Subordinated debt	$ 21,269	$ 22,457