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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Oct. 01, 2017 USD ($) branch_office $ / shares	Oct. 01, 2017 USD ($) branch_office $ / shares shares	Sep. 01, 2017 USD ($) shares	Mar. 03, 2017 USD ($) branch_office $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition
Value of stock issued					$ 3,070	$ 284,192
Goodwill					$ 234,368		$ 234,368
Carolina Bank
Business Acquisition
Number of branches | branch_office				8
Payments for acquisition				$ 25,279
Shares issued pursuant to acquisition (in shares) | shares				3,799,471
Payments for acquisition per share | $ / shares				$ 20.00
Merger share conversion ratio | shares				1.002
Contribution of stock in total consideration				75.00%
Contribution of cash in total consideration				25.00%
Value of stock issued				$ 114,478
Closing stock price | $ / shares				$ 30.13
Goodwill				$ 66,500		66,540
Merger related expenses						5,200
Total purchase price				$ 139,757
Bear Insurance
Business Acquisition
Number of branches | branch_office	4	4
Payments for acquisition			$ 7,900
Shares issued pursuant to acquisition (in shares) | shares			13,374
Value of stock issued			$ 400
Goodwill			5,300
Total purchase price			9,800
Annual commission income			4,000
Earn-out liability			1,200
Other amortizable intangible assets			$ 3,900
Asheville Savings Bank
Business Acquisition
Payments for acquisition	$ 17,939	$ 17,900
Shares issued pursuant to acquisition (in shares) | shares		4,920,061
Payments for acquisition per share | $ / shares	$ 41.90	$ 41.90
Merger share conversion ratio | shares		1.44
Contribution of stock in total consideration	90.00%	90.00%
Contribution of cash in total consideration	10.00%	10.00%
Value of stock issued	$ 169,299	$ 169,300
Closing stock price | $ / shares	$ 34.41	$ 34.41
Goodwill	$ 88,700	$ 88,700				88,677
Merger related expenses						2,700
Total purchase price	$ 187,238
Carolina Bank | Carolina Bank
Business Acquisition
Merger related expenses						4,600
Asheville Savings Bank | Asheville Savings Bank
Business Acquisition
Merger related expenses						$ 20,400
Buncombe County, North Carolina | Asheville Savings Bank
Business Acquisition
Number of branches | branch_office	8	8
Henderson, Madison, McDowell and Transylvania Counties, North Carolina | Asheville Savings Bank
Business Acquisition
Number of branches | branch_office	5	5

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