Fair Value - Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying Value
Financial assets
Cash and cash equivalents	$ 22,507	$ 27,655
Securities	165,927	171,440
Restricted securities	9,860	9,116
Loans held for sale		735
Net loans	676,871	624,956
Accrued interest receivable	2,750	3,012
Financial liabilities
Deposits	740,046	718,504
Federal funds purchased and securities sold under agreements to repurchase	11,168	18,730
Federal Home Loan Bank advances	85,000	76,000
Notes payable		0
Subordinated debentures	10,310	20,620
Series B mandatorily redeemable preferred stock	209	268
Accrued interest payable	286	235
Fair value measurements
Financial assets
Cash and cash equivalents	22,507	27,655
Securities	165,927	171,440
Loans held for sale		760
Net loans	677,832	629,017
Accrued interest receivable	2,750	3,012
Financial liabilities
Deposits	740,106	718,689
Federal funds purchased and securities sold under agreements to repurchase	11,168	18,730
Federal Home Loan Bank advances	85,039	76,271
Notes payable		0
Subordinated debentures	9,525	13,933
Series B mandatorily redeemable preferred stock	211	273
Accrued interest payable	286	235
Fair value measurements | Level 1
Financial assets
Cash and cash equivalents	22,507	27,655
Securities	0	0
Restricted securities	0	0
Loans held for sale		0
Net loans	0	0
Accrued interest receivable	0	0
Financial liabilities
Deposits	0	0
Federal funds purchased and securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Notes payable		0
Subordinated debentures	0	0
Series B mandatorily redeemable preferred stock	0	0
Accrued interest payable	0	0
Fair value measurements | Level 2
Financial assets
Cash and cash equivalents	0	0
Securities	163,260	166,419
Restricted securities	0	0
Loans held for sale		760
Net loans	0	0
Accrued interest receivable	511	402
Financial liabilities
Deposits	740,106	718,689
Federal funds purchased and securities sold under agreements to repurchase	11,168	18,730
Federal Home Loan Bank advances	85,039	76,271
Notes payable		0
Subordinated debentures	0	0
Series B mandatorily redeemable preferred stock	211	273
Accrued interest payable	272	169
Fair value measurements | Level 3
Financial assets
Cash and cash equivalents	0	0
Securities	2,667	5,021
Restricted securities	0	0
Loans held for sale		0
Net loans	677,832	629,017
Accrued interest receivable	2,239	2,610
Financial liabilities
Deposits	0	0
Federal funds purchased and securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Notes payable		0
Subordinated debentures	9,525	13,933
Series B mandatorily redeemable preferred stock	0	0
Accrued interest payable	$ 14	$ 66