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Loans (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Apr. 01, 2019 | Jul. 01, 2018
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  |  |  | $ 589,700,000 | $ 277,900,000
Loans and Leases Receivable, Deferred Income | $ 26,800,000 |  | $ 26,800,000 |  | $ 23,600,000 | $ 26,800,000 |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  | 5,434,000 |  |  |
Troubled Debt Restructuring Included In Nonaccrual Loans | 21,300,000 |  | 21,300,000 |  | 25,800,000 | 21,300,000 |  |
TDRs included in accruing loan totals | 17,400,000 |  | 17,400,000 |  | 20,900,000 | 17,400,000 |  |
Nonaccrual Trouble Debt Restructuring Current | 11,200,000 |  | 11,200,000 |  | 12,900,000 | 11,200,000 |  |
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 8,400,000 |  | 8,400,000 |  | 6,700,000 | 8,400,000 |  |
Specific reserves related to troubled debt restructuring | 300,000 |  | 300,000 |  | 200,000 | 300,000 |  |
Additional Specific Reserves Related To Troubled Debt Restructuring |  | $ 18,000 | 18,000 | $ 0 |  |  |  |
Loan Modifications on Nonacrrual status | 600,000 | 43,000 | $ 1,600,000 | 300,000 |  |  |  |
Loan past due period before entering default status |  |  | 30 days |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 700,000 | 4,600,000 | $ 1,100,000 | 4,700,000 |  |  |  |
Deposit Liabilities Reclassified as Loans Receivable | 1,500,000 |  | 1,500,000 |  | 2,000,000.0 | 1,500,000 |  |
PPP loans originated [Line Items] |  |  | 248,900,000 |  | 331,600,000 |  |  |
SBA Fees received |  |  |  |  | 20,200,000 |  |  |
SBA PPP Fees recognized | 5,000,000.0 | 2,800,000 | 9,600,000 | 2,800,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  | 578,600,000 | 272,800,000
Goodwill, Purchase Accounting Adjustments |  |  | 5,600,000 |  | 7,200,000 |  |  |
Troubled Debt Restructuring, Classification removed | 0 | 884,000 | 3,900,000 | 884,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  |  | 52,000 |  |  |  |  |
PPP Round 2 |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
SBA Fees received |  |  | 12,900,000 |  |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  | 1,316,000 |  |  |
PPP loans receivable [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income | 9,300,000 |  | 9,300,000 |  | 6,500,000 | 9,300,000 |  |
Accruing [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loans modified during period | 44,000 | 4,200,000 | 84,000 | 4,200,000 |  |  |  |
Nonaccrual [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Loans modified during period | 600,000 | 400,000 | 1,000,000.0 | 500,000 |  |  |  |
Consumer [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 2,700,000 | 39,400,000 | 3,700,000 | 45,300,000 |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | $ 100,000 | 0 | $ 200,000 |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  |  |  |  | 546,200,000 |  |
Commercial Portfolio Segment [Member] | Covid Restructuring [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  |  |  |  | 436,000 |  |
Commercial Portfolio Segment [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  |  |  |  | 6,200,000 |  |
Consumer Loan [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  |  |  |  | 87,100,000 |  |
Consumer Loan [Member] | Covid Restructuring [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  |  |  |  | 960,000 |  |
Consumer Loan [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  |  | 1,900,000 |  |  |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Business Combination, Acquired Receivable, Fair Value | $ 10,000,000.0 |  | $ 10,000,000.0 |  | $ 11,200,000 | $ 10,000,000.0 | 18,400,000 | 4,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  |  |  | $ 19,900,000 | $ 5,100,000

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