Parent Company Financial Information, Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statements of Cash Flows [Abstract]
Net income	$ 14,721	$ 12,551	$ 8,748
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock plan accruals	475	424	378
Net cash provided by operating activities	16,564	15,679	16,095
Cash flows from financing activities [Abstract]
Common stock issued	96	91	78
Net cash provided by financing activities	14,108	19,953	41,112
Net decrease in cash and cash equivalents	(4,539)	(36,860)	(6,751)
Cash and cash equivalents at beginning of year	116,032	152,892	159,643
Cash and cash equivalents at end of year	111,493	116,032	152,892
Parent Company [Member]
Statements of Cash Flows [Abstract]
Net income	14,721	12,551	8,748
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock plan accruals	475	424	378
Equity in undistributed earnings of subsidiary	(14,895)	(12,711)	(8,880)
Net cash provided by operating activities	301	264	246
Cash flows from financing activities [Abstract]
Common stock issued	96	91	78
Cash in lieu of fractional shares	(8)	(10)	(10)
Net cash provided by financing activities	88	81	68
Net decrease in cash and cash equivalents	389	345	314
Cash and cash equivalents at beginning of year	3,155	2,810	2,496
Cash and cash equivalents at end of year	$ 3,544	$ 3,155	$ 2,810