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Fair Value Measurements and Disclosures - Estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Securities available-for-sale	$ 134,165	$ 123,562
Securities held-to-maturity	6,772	6,857
Equity investments	1,013	1,031
Mortgage loans held-for-investment	13,590	12,182
Carrying amount
Financial assets:
Restricted investment in bank stock	5,114	7,861
Level 1 | Carrying amount
Financial assets:
Cash and cash equivalents	31,004	36,744
Level 1 | Fair value
Financial assets:
Cash and cash equivalents	31,004	36,744
Level 2 | Carrying amount
Financial assets:
Securities available-for-sale	134,165	123,562
Securities held-to-maturity	6,476	6,510
Equity investments	1,013	1,031
Mortgage loans held-for-sale	170,248	229,199
Mortgage loans held-for-investment	13,590	12,182
Financial liabilities:
Deposits	1,383,590	1,241,335
Short-term borrowings	26,376	106,862
Long-term debt	122,884	165,546
Subordinated debentures	40,701	40,671
Accrued interest payable	743	1,154
Level 2 | Carrying amount | Forward Commitments
Financial assets:
Derivative asset	1,832
Financial liabilities:
Derivatives	8	1,572
Level 2 | Carrying amount | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	151	1,118
Financial liabilities:
Derivatives	155	1,219
Level 2 | Fair value
Financial assets:
Securities available-for-sale	134,165	123,562
Securities held-to-maturity	6,772	6,857
Equity investments	1,013	1,031
Mortgage loans held-for-sale	170,248	229,199
Mortgage loans held-for-investment	13,590	12,182
Financial liabilities:
Deposits	1,470,200	1,392,500
Short-term borrowings	26,376	106,862
Long-term debt	124,450	168,000
Subordinated debentures	41,479	38,375
Accrued interest payable	743	1,154
Level 2 | Fair value | Forward Commitments
Financial assets:
Derivative asset	1,832
Financial liabilities:
Derivatives	8	1,572
Level 2 | Fair value | Customer derivatives - interest rate swaps
Financial assets:
Derivative asset	151	1,118
Financial liabilities:
Derivatives	155	1,219
Level 3 | Interest rate lock commitments
Financial assets:
Derivative asset	3,285	6,932
Level 3 | Carrying amount
Financial assets:
Loans receivable, net of the allowance and lease losses	1,340,961	1,272,582
Accrued interest receivable	5,567	5,482
Level 3 | Carrying amount | Interest rate lock commitments
Financial assets:
Derivative asset	3,285	6,932
Financial liabilities:
Derivatives	890	100
Level 3 | Fair value
Financial assets:
Loans receivable, net of the allowance and lease losses	1,352,643	1,289,776
Accrued interest receivable	5,567	5,482
Level 3 | Fair value | Interest rate lock commitments
Financial assets:
Derivative asset	3,285	6,932
Financial liabilities:
Derivatives	$ 890	$ 100

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