Condensed Parent Company Only Financial Statements - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 31,456	$ 34,200	$ 28,881
Changes in:
(Increase) decrease in other assets	(16,997)	136	(1,815)
Decrease in other liabilities	5,223	1,174	1,812
Payments to Acquire Additional Interest in Subsidiaries	53,000	0	0
Cash flows from financing activities:
Proceeds from the issuance of subordinated debt	60,000	0	0
Cash dividends paid, net of DRP	(7,105)	(6,371)	(5,443)
Proceeds from issuance of common stock	91	69	121
Net settlement for employee taxes on restricted stock and options	(233)	(402)	(559)
Net proceeds from exercise of stock options	21	185	308
Cash and cash equivalents at beginning of year	63,794	63,120	54,806
Cash and cash equivalents at end of year	253,782	63,794	63,120
Parent
Cash flows from operating activities:
Net income	31,456	34,200	28,881
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of subsidiaries	(30,309)	(29,329)	(25,635)
Payment from subsidiary bank for stock compensation expense	1,872	1,869	1,879
Changes in:
(Increase) decrease in other assets	(229)	(3)	213
Decrease in other liabilities	385	12	13
Net cash provided by operating activities	3,175	6,749	5,351
Cash flows from investing activities:
Net cash provided by investing activities	(53,000)	0	0
Cash flows from financing activities:
Proceeds from the issuance of subordinated debt	60,000	0	0
Cash dividends paid, net of DRP	(7,105)	(6,371)	(5,443)
Proceeds from issuance of common stock	91	69	121
Net settlement for employee taxes on restricted stock and options	(233)	(402)	(559)
Net proceeds from exercise of stock options	21	185	308
Net cash used in financing activities	52,774	(6,519)	(5,573)
Net increase (decrease) in cash and cash equivalents	2,949	230	(222)
Cash and cash equivalents at beginning of year	353	123	345
Cash and cash equivalents at end of year	$ 3,302	$ 353	$ 123