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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, 2019 USD ($) loans | Sep. 30, 2018 USD ($) loans | Sep. 30, 2019 USD ($) loans | Sep. 30, 2018 USD ($) loans | Dec. 31, 2018 USD ($)
Financing Receivable, Recorded Investment |  |  |  |  |
SBA loans in the participation sold portfolio, considered impaired | $ 14,700,000 |  | $ 14,700,000 |  | $ 13,200,000
Guaranteed portion of SBA loans sold to third parties | 4,900,000 | $ 7,800,000 | 10,500,000 | $ 10,800,000 |
Total amount of outstanding SBA loans sold | 74,700,000 |  | 74,700,000 |  | 83,300,000
Loans and leases transferred to third parties total principal amount | 7,500,000 | $ 17,200,000 | 31,500,000 | 51,600,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 | $ 0 |
Total amount of outstanding loans transferred to third parties as loan participations | 136,900,000 |  | 136,900,000 |  | 129,700,000
Total amount of loan participations remaining on the Corporations balance sheet | 231,500,000 |  | 231,500,000 |  | 208,900,000
Loans in the participation sold portfolio, considered impaired | 0 |  | 0 |  | 0
Loan participations purchased on the Corporation's balance sheet | 512,000 |  | 512,000 |  | 569,000
Non-accrual troubled debt restructurings | 19,000,000 |  | 19,000,000 |  | 7,600,000
Unfunded commitments, troubled debt restructurings | $ 0 |  | $ 0 |  |
Loans modified to troubled debt restructuring | loans | 4 | 0 | 18 | 0 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 0 | 0 | 0 | 0 |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | $ 8,300,000 |  | $ 8,300,000 |  | 7,100,000
Performing troubled debt restructurings | $ 146,000 |  | $ 146,000 |  | $ 180,000

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