Loans (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Apr. 01, 2019	Jul. 01, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value						$ 578,577,000	$ 272,753,000
Business Combination, Acquired Receivables, Gross Contractual Amount						589,698,000	277,919,000
Loans and Leases Receivable, Deferred Income	$ 12,700,000		$ 12,700,000		$ 12,500,000
Goodwill, Purchase Accounting Adjustments			15,200,000		4,400,000
Troubled Debt Restructuring, Classification removed	0	$ 1,900,000	23,000	$ 2,200,000
Partial Charge-Offs On Impaired Loans			6,113,000		11,246,000
Impaired Financing Receivable, Related Allowance	2,379,000		2,379,000		2,273,000
Recorded investment, related to loans	12,500,000		12,500,000		14,000,000.0
Troubled Debt Restructuring Included In Nonaccrual Loans	24,100,000		24,100,000		24,600,000
TDRs included in accruing loan totals	17,800,000		17,800,000		15,200,000
Nonaccrual Trouble Debt Restructuring Current	12,100,000		12,100,000		19,200,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	2,700,000		2,700,000		300,000
Specific reserves related to troubled debt restructuring	1,200,000		1,200,000
Additional Specific Reserves Related To Troubled Debt Restructuring		0	1,000	10,000
Financing Receivable, Modifications, Recorded Investment, During Period	5,244,000	2,374,000	9,182,000	3,767,000
Loan Modifications on Nonacrrual status	600,000	5,000	$ 1,300,000	400,000
Loan past due period before entering default status			30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	1,200,000	1,200,000	$ 1,400,000	1,400,000
Deposit Liabilities Reclassified as Loans Receivable	2,200,000		2,200,000		2,300,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Partial Charge-Offs On Impaired Loans			4,000,000.0		8,800,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Partial Charge-Offs On Impaired Loans			2,100,000		2,400,000
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	780,000	589,000	2,995,000	720,000
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Related Allowance	0		0		0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Related Allowance	48,000		48,000		86,000
Accruing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	2,397,000	1,223,000	3,092,000	1,511,000
Loans modified during period	30,000	21,000	30,000	21,000
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		455,000	0	455,000
Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	2,847,000	1,151,000	6,090,000	2,256,000
Loans modified during period	1,200,000	1,200,000	1,400,000	1,400,000
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	780,000	134,000	2,995,000	265,000
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	7,400,000	4,700,000	13,400,000	11,000,000.0
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 100,000		$ 200,000
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value	4,200,000		4,200,000		4,400,000	19,900,000	4,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount	4,400,000		4,400,000		$ 4,600,000	$ 21,800,000	$ 5,100,000
NewDominion [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Allowance for Loan and Lease Losses, Loans Acquired			3,000
Carolina Alliance [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value	19,700,000		19,700,000
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 22,500,000		22,500,000
Allowance for Loan and Lease Losses, Loans Acquired			$ 0