Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan Losses
Balance, beginning of year	$ 12,601	$ 12,427	$ 12,600
Provision for loan losses	250	950	400
Charge-offs	(326)	(1,200)	(964)
Recoveries	276	424	391
Balance, end of year	12,801	12,601	12,427
Reserve for Unfunded Lending Commitments
Balance, beginning of year	184	163	210
Provision for (recovery) unfunded commitments	19	21	(47)
Charge-offs (recovery of)	0	0	0
Balance, end of year	$ 203	$ 184	$ 163