Fair Value of Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and cash equivalents, carrying amount	$ 20,062	$ 19,996	$ 9,853	$ 13,569
Cash and cash equivalents	20,062	19,996
Investment securities available for sale	396,920	385,563
Bank stocks, at cost, carrying amount	5,323	5,299
Loans, net	416,130	417,957
Loans held for sale	8,588	5,517
Loans, net, carrying amount	417,955	420,461
Loans held for sale, net, carrying amount	8,588	5,517
Derivative financial instruments	966	662
Accrued interest receivable	3,874	4,240
Financial liabilities:
Time deposits, carrying amount	(139,197)	(139,838)
FHLB borrowings, carrying amount	(33,450)	(39,100)
Subordinated debentures, carrying amount	(21,334)	(21,284)
Other borrowings, carrying amount	(13,491)	(12,483)
Non-maturity deposits	(613,489)	(601,683)
Time deposits	(137,820)	(138,623)
FHLB borrowings	(33,967)	(35,695)
Subordinated debentures	(18,731)	(18,608)
Other borrowings	(13,491)	(12,483)
Derivative financial instruments	(154)
Accrued interest payable	(253)	(268)
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	20,062	19,996
Investment securities available for sale	5,761	7,123
Loans, net	0	0
Loans held for sale	0	0
Derivative financial instruments	0	0
Accrued interest receivable	16	21
Financial liabilities:
Non-maturity deposits	(613,489)	(601,683)
Time deposits	0	0
FHLB borrowings	0	0
Subordinated debentures	0	0
Other borrowings	0	0
Derivative financial instruments	0
Accrued interest payable	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents	0	0
Investment securities available for sale	391,159	378,440
Loans, net	0	0
Loans held for sale	8,588	5,517
Derivative financial instruments	966	662
Accrued interest receivable	2,067	2,104
Financial liabilities:
Non-maturity deposits	0	0
Time deposits	(137,820)	(138,623)
FHLB borrowings	(33,967)	(35,695)
Subordinated debentures	(18,731)	(18,608)
Other borrowings	(13,491)	(12,483)
Derivative financial instruments	(154)
Accrued interest payable	(253)	(268)
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents	0	0
Investment securities available for sale	0	0
Loans, net	416,130	417,957
Loans held for sale	0	0
Derivative financial instruments	0	0
Accrued interest receivable	1,791	2,115
Financial liabilities:
Non-maturity deposits	0	0
Time deposits	0	0
FHLB borrowings	0	0
Subordinated debentures	0	0
Other borrowings	0	0
Derivative financial instruments	0
Accrued interest payable	0	0
Carrying Amount, Fair Value Disclosure [Member]
Financial assets:
Cash and cash equivalents, carrying amount	20,062	19,996
Investment securities available for sale	396,920	385,563
Bank stocks, at cost, carrying amount	5,323	5,299
Loans held for sale		5,517
Loans, net, carrying amount	417,955	420,461
Loans held for sale, net, carrying amount	8,588
Derivative financial instruments	966	662
Accrued interest receivable, carrying amount	3,874	4,240
Financial liabilities:
Non-maturity deposits, carrying amount	(613,489)	(601,683)
Time deposits, carrying amount	(139,197)	(139,838)
FHLB borrowings, carrying amount	(33,450)	(39,100)
Subordinated debentures, carrying amount	(21,334)	(21,284)
Other borrowings, carrying amount	(13,491)	(12,483)
Accrued interest payable, carrying amount	(253)	$ (268)
Derivative financial instruments	$ (154)