Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net Income	$ 21,893	$ 20,312	$ 14,639	$ 11,655	$ 18,543	$ 20,537	$ 16,642	$ 10,816	$ 68,499	$ 66,538	$ 53,117
Change in:
Share based compensation									132	215	251
Other assets									(13,987)	99,735	4,520
Other liabilities									(897)	(608)	658
Net cash provided by operating activities									78,765	174,372	72,286
Investing Activities
Net cash used in investing activities									(492,322)	(94,145)	(303,762)
Financing Activities
Net change in borrowings									(74,725)	(71,040)	(13,589)
Dividends paid on common shares									(21,183)	(20,835)	(15,418)
Proceeds from issuance of stock									1,390	1,705	622
Net proceeds from issuance of subordinated notes									58,824	0	0
Net cash provided by (used in) financing activities									564,437	(39,888)	229,988
Cash and Cash Equivalents, Beginning of Period				98,831				58,492	98,831	58,492	59,980
Cash and Cash Equivalents, End of Period	249,711				98,831				249,711	98,831	58,492
Parent Company
Operating Activities
Net Income									68,499	66,538	53,117
Items not requiring (providing) cash
Equity in undistributed net income of subsidiaries									(13,131)	(25,053)	(9,643)
Change in:
Share based compensation									132	215	251
Amortization of unearned compensation									1,206	705	169
Other assets									(20)	(5,449)	132
Other liabilities									(14)	1,629	378
Net cash provided by operating activities									56,672	38,585	44,404
Investing Activities
Repurchase of outstanding stock									(19,636)	(1,595)	0
Net cash used in investing activities									(19,636)	755	0
Financing Activities
Net change in borrowings									16	98	(12,316)
Dividends paid on common shares									(21,183)	(20,835)	(15,418)
Proceeds from issuance of stock									1,390	1,705	622
Net cash provided by (used in) financing activities									39,047	(19,032)	(27,112)
Net Change in Cash and Cash Equivalents									76,083	20,308	17,292
Cash and Cash Equivalents, Beginning of Period				$ 50,961				$ 30,653	50,961	30,653	13,361
Cash and Cash Equivalents, End of Period	$ 127,044				$ 50,961				127,044	50,961	30,653
Parent Company | Salin
Investing Activities
Acquisition of Salin									$ 0	$ 2,350	$ 0