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Fair Value Measurements and Disclosures - Estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Securities available-for-sale	$ 146,149	$ 123,562
Securities held-to-maturity	6,660	6,857
Equity investments	1,011	1,031
Mortgage loans held-for-investment	17,142	12,182
Carrying amount
Financial assets:
Restricted investment in bank stock	4,162	7,861
Level 1 | Carrying amount
Financial assets:
Cash and cash equivalents	63,121	36,744
Level 1 | Fair value
Financial assets:
Cash and cash equivalents	63,121	36,744
Level 2 | Carrying amount
Financial assets:
Securities available-for-sale	146,149	123,562
Securities held-to-maturity	6,406	6,510
Equity investments	1,011	1,031
Mortgage loans held-for-sale	117,996	229,199
Mortgage loans held-for-investment	17,142	12,182
Financial liabilities:
Deposits	1,439,047	1,241,335
Short-term borrowings	22,278	106,862
Long-term debt	78,405	165,546
Subordinated debentures	40,760	40,671
Accrued interest payable	663	1,154
Level 2 | Carrying amount | Forward Commitments
Financial assets:
Derivative asset	447
Financial liabilities:
Derivatives	22	1,572
Level 2 | Carrying amount | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	1,052	1,118
Financial liabilities:
Derivatives	1,101	1,219
Level 2 | Fair value
Financial assets:
Securities available-for-sale	146,149	123,562
Securities held-to-maturity	6,660	6,857
Equity investments	1,011	1,031
Mortgage loans held-for-sale	117,996	229,199
Mortgage loans held-for-investment	17,142	12,182
Financial liabilities:
Deposits	1,552,500	1,392,500
Short-term borrowings	22,278	106,862
Long-term debt	79,373	168,000
Subordinated debentures	41,859	38,375
Accrued interest payable	663	1,154
Level 2 | Fair value | Forward Commitments
Financial assets:
Derivative asset	447
Financial liabilities:
Derivatives	22	1,572
Level 2 | Fair value | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	1,052	1,118
Financial liabilities:
Derivatives	1,101	1,219
Level 3 | Interest rate lock commitments
Financial assets:
Derivative asset	1,712	6,932
Level 3 | Carrying amount
Financial assets:
Loans receivable, net of the allowance and lease losses	1,361,528	1,272,582
Accrued interest receivable	5,080	5,482
Level 3 | Carrying amount | Interest rate lock commitments
Financial assets:
Derivative asset	1,712	6,932
Financial liabilities:
Derivatives	360	100
Level 3 | Fair value
Financial assets:
Loans receivable, net of the allowance and lease losses	1,391,260	1,289,776
Accrued interest receivable	5,080	5,482
Level 3 | Fair value | Interest rate lock commitments
Financial assets:
Derivative asset	1,712	6,932
Financial liabilities:
Derivatives	$ 360	$ 100

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