Parent Company Financial Information - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 20,906	$ 22,579	$ 15,249
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of securities	(274)	(81)	(812)
Net change in other assets	10,157	(100)	(379)
Net change in other liabilities	(780)	723	284
Net cash provided by operating activities	32,680	27,502	25,751
Cash Flows from Investing Activities:
Purchases of securities available for sale	(155,746)	(106,575)	(84,931)
Proceeds from sales of equity securities	445	431	0
Proceeds from sales of securities	29,878	57,607	55,903
Cash acquired in bank acquisition	26,283	0	0
Net cash used in investing activities	(4,570)	(39,901)	(147,856)
Cash Flows from Financing Activities:
Common stock dividends paid	(10,965)	(8,702)	(8,384)
Repurchase of common stock	(3,146)	0	0
Proceeds from exercise of stock options	688	861	113
Net cash (used in) provided by financing activities	(12,783)	24,177	121,375
Net Increase (Decrease) in Cash and Cash Equivalents	15,327	11,778	(730)
Cash and Cash Equivalents at Beginning of Period	64,255	52,477	53,207
Cash and Cash Equivalents at End of Period	79,582	64,255	52,477
Parent Company
Cash Flows from Operating Activities:
Net income	20,906	22,579	15,249
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of securities	0	0	(221)
Equity in (undistributed) distributions of subsidiary	1,286	(13,112)	(9,942)
Net change in other assets	(382)	(194)	83
Net change in other liabilities	(35)	136	(82)
Net cash provided by operating activities	21,775	9,409	5,087
Cash Flows from Investing Activities:
Purchases of securities available for sale	(2,220)	0	(373)
Proceeds from sales of equity securities	445	431	0
Proceeds from sales of securities	0	0	500
Cash paid in bank acquisition	(27)	0	0
Cash acquired in bank acquisition	981	0	0
Net cash used in investing activities	(821)	431	127
Cash Flows from Financing Activities:
Common stock dividends paid	(10,965)	(8,702)	(8,384)
Repurchase of common stock	(3,146)	0	0
Proceeds from exercise of stock options	688	861	113
Net cash (used in) provided by financing activities	(13,423)	(7,841)	(8,271)
Net Increase (Decrease) in Cash and Cash Equivalents	7,531	1,999	(3,057)
Cash and Cash Equivalents at Beginning of Period	3,596	1,597	4,654
Cash and Cash Equivalents at End of Period	$ 11,127	$ 3,596	$ 1,597