Allowance for Loan Losses and Reserve for Unfunded Lending Commitments - Changes In Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses
Balance, beginning of year	$ 12,805	$ 13,603	$ 12,801
Provision for (recovery of) loan losses	456	(103)	1,016
Charge-offs	(333)	(1,020)	(690)
Recoveries	224	325	476
Balance, end of year	13,152	12,805	13,603
Reserve for Unfunded Lending Commitments
Balance, beginning of year	217	206	203
Provision for unfunded commitments	112	11	3
Charge-offs	0	0	0
Balance, end of year	$ 329	$ 217	$ 206