Loans (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Apr. 01, 2019	Jul. 01, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value				$ 578,577,000
Business Combination, Acquired Receivables, Gross Contractual Amount				589,698,000	$ 277,900,000
Loans and Leases Receivable, Deferred Income	$ 16,300,000		$ 16,300,000
Goodwill, Purchase Accounting Adjustments	10,400,000		11,700,000
Troubled Debt Restructuring, Classification removed	0	$ 23,000
Partial Charge-Offs On Impaired Loans	733,000		719,000
Impaired Financing Receivable, Related Allowance	5,531,000		5,230,000
Recorded investment, related to loans	13,200,000		12,700,000
Troubled Debt Restructuring Included In Nonaccrual Loans	26,600,000		34,300,000
TDRs included in accruing loan totals	27,400,000		21,300,000
Nonaccrual Trouble Debt Restructuring Current	15,900,000		23,200,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	10,700,000		7,900,000
Specific reserves related to troubled debt restructuring	2,100,000		2,200,000
Additional Specific Reserves Related To Troubled Debt Restructuring	0	0
Financing Receivable, Modifications, Recorded Investment, During Period	3,408,000	4,560,000
Loan Modifications on Nonacrrual status	$ 300,000	700,000
Loan past due period before entering default status	30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	$ 5,100,000	700,000
Deposit Liabilities Reclassified as Loans Receivable	1,600,000		2,200,000
Acquired financing receivable with deteriorated credit quality not TDR	270,000		440,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Partial Charge-Offs On Impaired Loans	600,000		500,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Partial Charge-Offs On Impaired Loans	181,000		210,000
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,196,000	2,215,000
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
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Related Allowance	96,000		35,000
Accruing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,596,000	652,000
Loans modified during period	4,500,000	9,000
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,136,000
Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,812,000	3,908,000
Loans modified during period	500,000	700,000
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	60,000	2,215,000
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	12,200,000	7,200,000
Financing Receivables, COVID Modifications, Recorded Investment, During Period	5,000,000.0
Consumer [Member] | Other Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period	27,000
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	100,000	$ 0
Financing Receivables, COVID Modifications, Recorded Investment, During Period	248,100,000
Commercial Portfolio Segment [Member] | Other Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period	5,500,000
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value	2,900,000		3,000,000.0	18,400,000	4,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount	3,000,000.0		3,200,000	$ 19,900,000	$ 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	6,000		101,000
Carolina Alliance [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value	10,900,000		11,300,000
Business Combination, Acquired Receivables, Gross Contractual Amount	13,300,000		13,800,000
Allowance for Loan and Lease Losses, Loans Acquired	$ 113,000		$ 167,000