Parent Company Financial Information, Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statements of Cash Flows [Abstract]
Net income	$ 12,161	$ 14,721	$ 12,551
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock-based compensation	574	475	424
Net cash provided by operating activities	12,590	16,564	15,679
Cash flows from financing activities [Abstract]
Common stock issued	111	96	91
Net cash provided by financing activities	344,633	14,108	19,953
Net increase (decrease) in cash and cash equivalents	155,684	(4,539)	(36,860)
Cash and cash equivalents at beginning of year	111,493	116,032	152,892
Cash and cash equivalents at end of year	267,177	111,493	116,032
Parent Company [Member]
Statements of Cash Flows [Abstract]
Net income	12,161	14,721	12,551
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock-based compensation	574	475	424
Equity in undistributed earnings of subsidiary	(12,333)	(14,895)	(12,711)
Net cash provided by operating activities	402	301	264
Cash flows from financing activities [Abstract]
Common stock issued	111	96	91
Cash in lieu of fractional shares	(8)	(8)	(10)
Net cash provided by financing activities	103	88	81
Net increase (decrease) in cash and cash equivalents	505	389	345
Cash and cash equivalents at beginning of year	3,544	3,155	2,810
Cash and cash equivalents at end of year	$ 4,049	$ 3,544	$ 3,155