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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2020 USD ($) loans | Sep. 30, 2019 USD ($) loans | Sep. 30, 2020 USD ($) loans | Sep. 30, 2019 USD ($) loans | Dec. 31, 2019 USD ($)
Financing Receivable, Recorded Investment |  |  |  |  |
SBA loans in the participation sold portfolio, considered impaired | $ 9,600,000 |  | $ 9,600,000 |  | $ 12,100,000
Guaranteed portion of SBA loans sold to third parties | 7,900,000 | $ 4,900,000 | 17,200,000 | $ 10,500,000 |
Total amount of outstanding SBA loans sold | 75,100,000 |  | 75,100,000 |  | 73,800,000
Loans and leases transferred to third parties total principal amount | 7,700,000 | $ 7,500,000 | 29,900,000 | $ 31,500,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 |  |
Total amount of outstanding loans transferred to third parties as loan participations | 144,100,000 |  | 144,100,000 |  | 142,800,000
Total amount of loan participations remaining on the Corporations balance sheet | 266,700,000 |  | 266,700,000 |  | 244,600,000
Loans in the participation sold portfolio, considered impaired, gross amount | 5,800,000 |  | 5,800,000 |  | 0
Loans in the participation sold portfolio, considered impaired, sold amount | 4,200,000 |  | 4,200,000 |  |
Loan participations purchased on the Corporation's balance sheet | 424,000 |  | 424,000 |  | 492,000
Non-accrual troubled debt restructurings | 15,400,000 |  | 15,400,000 |  | 15,600,000
Specific Reserves on Troubled Debt Restructurings | 4,400,000 |  | 4,400,000 |  | 2,700,000
Unfunded commitments, troubled debt restructurings | 0 |  | 0 |  |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | 10,200,000 |  | 10,200,000 |  | 9,500,000
Performing troubled debt restructurings | $ 47,000 |  | $ 47,000 |  | $ 140,000
Commercial real estate — owner occupied |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 2 |  | 2 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 272,000 |  | $ 272,000 |  |
Commercial and industrial |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 2 | 0 | 2 | 0 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 703,000 |  | $ 703,000 |  |

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