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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 |  |

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