Fair Value - Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Carrying Value
Financial assets
Cash and cash equivalents	$ 31,237	$ 22,507
Securities	156,302	165,927
Restricted securities	8,019	9,860
Net loans	679,148	676,871
Accrued interest receivable	2,454	2,750
Financial liabilities
Deposits	728,489	740,046
Federal funds purchased and securities sold under agreements to repurchase	11,303	11,168
Federal Home Loan Bank advances	93,000	85,000
Notes payable		0
Subordinated debentures	10,310	10,310
Series B mandatorily redeemable preferred stock	209	209
Accrued interest payable	160	286
Fair value measurements
Financial assets
Cash and cash equivalents	31,237	22,507
Securities	156,302	165,927
Net loans	678,226	677,832
Accrued interest receivable	2,454	2,750
Financial liabilities
Deposits	728,513	740,106
Federal funds purchased and securities sold under agreements to repurchase	11,303	11,168
Federal Home Loan Bank advances	93,058	85,039
Notes payable		0
Subordinated debentures	9,724	9,525
Series B mandatorily redeemable preferred stock	211	211
Accrued interest payable	160	286
Fair value measurements | Level 1
Financial assets
Cash and cash equivalents	31,237	22,507
Securities	0	0
Restricted securities	0	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	153,635	163,260
Restricted securities	0	0
Net loans	0	0
Accrued interest receivable	591	511
Financial liabilities
Deposits	728,513	740,106
Federal funds purchased and securities sold under agreements to repurchase	11,303	11,168
Federal Home Loan Bank advances	93,058	85,039
Notes payable		0
Subordinated debentures	0	0
Series B mandatorily redeemable preferred stock	211	211
Accrued interest payable	144	272
Fair value measurements | Level 3
Financial assets
Cash and cash equivalents	0	0
Securities	2,667	2,667
Restricted securities	0	0
Net loans	678,226	677,832
Accrued interest receivable	1,863	2,239
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	9,724	9,525
Series B mandatorily redeemable preferred stock	0	0
Accrued interest payable	$ 16	$ 14