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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 |  |  |  |

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