Fair Value Measurements - Carrying amount, fair value and placement in the fair value hierarchy of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Cash and due from banks	$ 9,435	$ 7,428
Interest-bearing deposits at other institutions	34,060	15,139
Amortized Cost	1,761	1,760
Total Available-for-Sale Securities	123,537	115,952
Restricted stock	5,299	3,438
Loans, net	1,127,584	880,952
Bank owned life insurance	16,406	15,969
Accrued interest receivable	4,050	2,964
Financial liabilities:
Time deposits	345,386	373,616
Subordinated notes	24,407	24,327
Accrued interest payable	811	417
Carrying Amount
Financial assets:
Cash and due from banks	9,435	7,428
Interest-bearing deposits at other institutions	34,060	15,139
Amortized Cost	1,761	1,760
Total Available-for-Sale Securities	123,537	115,952
Restricted stock	5,299	3,438
Loans, net	1,127,584	880,952
Bank owned life insurance	16,406	15,969
Accrued interest receivable	4,050	2,964
Financial liabilities:
Checking, savings and money market accounts	817,054	554,547
Time deposits	345,386	373,616
Subordinated notes	24,407	24,327
Accrued interest payable	811	417
Level 1
Financial assets:
Cash and due from banks	9,435	7,428
Interest-bearing deposits at other institutions	34,060	15,139
Level 2
Financial assets:
Amortized Cost	1,735	1,762
Total Available-for-Sale Securities	123,537	115,952
Restricted stock	5,299	3,438
Bank owned life insurance	16,406	15,969
Accrued interest receivable	4,050	2,964
Financial liabilities:
Checking, savings and money market accounts	817,054	554,547
Time deposits	344,877	371,782
Subordinated notes	24,515	23,462
Accrued interest payable	811	417
Level 3
Financial assets:
Loans, net	$ 1,116,012	$ 876,569