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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 |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) loans | Sep. 30, 2017 USD ($) loans | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment |  |  |  |  |
SBA loans in the participation sold portfolio, considered impaired | $ 12,000,000 |  | $ 12,000,000 |  | $ 11,100,000
Guaranteed portion of SBA loans sold to third parties | 4,500,000 | $ 6,300,000 | 10,800,000 | $ 15,500,000 |
Total amount of outstanding SBA loans sold | 91,100,000 |  | 91,100,000 |  | 100,300,000
Loans and leases transferred to third parties total principal amount | 17,200,000 | $ 15,900,000 | 51,600,000 | 36,600,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 | $ 0 |
Total amount of outstanding loans transferred to third parties as loan participations | 125,700,000 |  | 125,700,000 |  | 106,400,000
Total amount of loan participations remaining on the Corporations balance sheet | 206,000,000 |  | 206,000,000 |  | 181,700,000
Loans in the participation sold portfolio, considered impaired | 0 |  | 0 |  | 0
Loan participations purchased on the Corporation's balance sheet | 590,000 |  | 590,000 |  | 650,000
Total gross loans and leases receivable | 1,600,109,000 |  | 1,600,109,000 |  | 1,503,038,000
Non-accrual troubled debt restructurings | 8,100,000 |  | 8,100,000 |  | 8,800,000
Unfunded commitments, troubled debt restructurings | 0 |  | $ 0 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans |  |  | 0 | 0 |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | 10,400,000 |  | $ 10,400,000 |  | 6,600,000
Performing troubled debt restructurings | 187,000 |  | 187,000 |  | 332,000
Substandard |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 38,800,000 |  | 38,800,000 |  | 32,700,000
Doubtful |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 |  | 4,700,000
Consumer and other: |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 31,839,000 |  | 31,839,000 |  | 25,361,000
Commercial and industrial |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | $ 457,932,000 |  | $ 457,932,000 |  | $ 429,002,000

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