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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) loans in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) loans | Jun. 30, 2017 USD ($) loans | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment |  |  |  |  |
SBA loans in the participation sold portfolio, considered impaired | $ 9,000,000 |  | $ 9,000,000 |  | $ 11,100,000
Guaranteed portion of SBA loans sold to third parties | 3,200,000 | $ 5,900,000 | 6,300,000 | $ 9,200,000 |
Total amount of outstanding SBA loans sold | 89,500,000 |  | 89,500,000 |  | 100,300,000
Loans and leases transferred to third parties total principal amount | 14,800,000 | $ 8,700,000 | 34,400,000 | 20,700,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 | $ 0 |
Total amount of outstanding loans transferred to third parties as loan participations | 112,700,000 |  | 112,700,000 |  | 106,400,000
Total amount of loan participations remaining on the Corporations balance sheet | 193,700,000 |  | 193,700,000 |  | 181,700,000
Loans in the participation sold portfolio, considered impaired | 0 |  | 0 |  | 0
Loan participations purchased on the Corporation's balance sheet | 610,000 |  | 610,000 |  | 650,000
Total gross loans and leases receivable | 1,596,598,000 |  | 1,596,598,000 |  | 1,503,038,000
Non-accrual troubled debt restructurings | 8,400,000 |  | 8,400,000 |  | 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 | 11,500,000 |  | $ 11,500,000 |  | 6,600,000
Performing troubled debt restructurings | 249,000 |  | 249,000 |  | 332,000
Substandard |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 42,500,000 |  | 42,500,000 |  | 32,700,000
Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 |  | 0
Doubtful |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 |  | 4,692,000
Loss |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 |  | 0
Consumer and other: |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | 29,037,000 |  | 29,037,000 |  | 25,361,000
Commercial and industrial |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Total gross loans and leases receivable | $ 447,540,000 |  | $ 447,540,000 |  | $ 429,002,000

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