Fair Value Measurements and Disclosures - Estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Securities available-for-sale	$ 159,302	$ 123,562
Securities held-to-maturity	6,591	6,857
Equity investments	2,354	1,031
Mortgage loans held for investment	17,558	12,182
Carrying amount
Financial assets:
Restricted investment in bank stock	5,117	7,861
Level 1 | Carrying amount
Financial assets:
Cash and cash equivalents	23,480	36,744
Level 1 | Fair value
Financial assets:
Cash and cash equivalents	23,480	36,744
Level 2 | Carrying amount
Financial assets:
Securities available-for-sale	159,302	123,562
Securities held-to-maturity	6,372	6,510
Equity investments	2,354	1,031
Mortgage loans held-for-sale	80,882	229,199
Mortgage loans held for investment	17,558	12,182
Financial liabilities:
Deposits	1,446,413	1,241,335
Short-term borrowings	41,344	106,862
Long-term debt		165,546
Subordinated debentures	40,508	40,671
Accrued interest payable	31	1,154
Level 2 | Carrying amount | Forward Commitments
Financial assets:
Derivative asset	65
Financial liabilities:
Derivatives	106	1,572
Level 2 | Carrying amount | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	961	1,118
Financial liabilities:
Derivatives	1,018	1,219
Level 2 | Fair value
Financial assets:
Securities available-for-sale	159,302	123,562
Securities held-to-maturity	6,591	6,857
Equity investments	2,354	1,031
Mortgage loans held-for-sale	80,882	229,199
Mortgage loans held for investment	17,558	12,182
Financial liabilities:
Deposits	1,549,100	1,392,500
Short-term borrowings	41,344	106,862
Long-term debt		168,000
Subordinated debentures	40,803	38,375
Accrued interest payable	31	1,154
Level 2 | Fair value | Forward Commitments
Financial assets:
Derivative asset	65
Financial liabilities:
Derivatives	106	1,572
Level 2 | Fair value | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	961	1,118
Financial liabilities:
Derivatives	1,018	1,219
Level 3 | Carrying amount
Financial assets:
Loans receivable, net of the allowance for loan and lease losses	1,368,899	1,272,582
Accrued interest receivable	5,009	5,482
Level 3 | Carrying amount | Interest rate lock commitments
Financial assets:
Derivative asset	1,122	6,932
Financial liabilities:
Derivatives	203	100
Level 3 | Fair value
Financial assets:
Loans receivable, net of the allowance for loan and lease losses	1,370,885	1,289,776
Accrued interest receivable	5,009	5,482
Level 3 | Fair value | Interest rate lock commitments
Financial assets:
Derivative asset	1,122	6,932
Financial liabilities:
Derivatives	$ 203	$ 100