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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) loans | Dec. 31, 2017 USD ($) loans | Dec. 31, 2016 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |
SBA loans in the participation sold portfolio, considered impaired | $ 13,200,000 | $ 11,100,000 |
Guaranteed Portion of SBA Loans Sold to Third Parties Total | 14,100,000 | 16,500,000 |
Total amount of outstanding SBA loans sold | 83,300,000 | 100,300,000 |
Loans and leases transferred to third parties total principal amount | 73,900,000 | 63,600,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans | 0 | 0 |
Total amount of outstanding loans transferred to third parties as loan participations | 129,700,000 | 106,400,000 |
Total amount of loan participations remaining on the Corporation's balance sheet | 208,900,000 | 181,700,000 |
Loans in the participation sold portfolio, considered impaired | 0 | 0 |
Loan participations purchased on the Corporation's balance sheet | 569,000 | 650,000 |
Residential Real Estate Loans Sold, Principal Amount | 0 | 1,600,000 |
Non-accrual troubled debt restructurings | 7,600,000 | $ 8,800,000 |
Unfunded commitments, troubled debt restructurings | $ 0 |  |
Financing Receivable, Modifications, Number of Contracts | loans | 0 | 5 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans |  | 0 |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | $ 7,100,000 | $ 6,600,000 | $ 3,400,000
Performing troubled debt restructurings | 180,000 | 332,000 | 717,000
Impairments of residual value of leased property | $ 0 | $ 0 | $ 0
Commercial and industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | loans |  | 4 |

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