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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 0 |  |
Total amount of SBA loan participations remaining on the corporations balance sheet | $ 62,100 |  | $ 62,100 | $ 53,200 |
Loans and leases transferred to third parties total principal amount | 17,600 | $ 26,800 |  |  |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 |  |
Gain on sale of SBA loans |  |  | 4,400 | 3,999 | $ 318
Loan participations purchased on the Corporation's balance sheet | 1,200 |  | 1,200 | 1,800 |
Total amount of outstanding loans transferred to third parties as loan participations | 102,700 |  | 102,700 | 91,000 |
Total amount of loan participations remaining on the Corporation's balance sheet | 106,100 |  | 106,100 | 110,600 |
Loans in the participation sold portfolio, considered impaired | 0 |  | 0 | 0 |
Residential Real Estate Loans Sold, Principal Amount |  |  | 26,300 | 32,600 |
Loans to executive officers, directors and their related interests | 6,300 |  | 6,300 | 6,900 |
New loans granted to executive officers, directors and their related interests |  |  | 700 | 3,900 |
Repayments on loans to executive officers, directors and their related interests |  |  | 1,300 | 1,366 |
Loans and leases receivable, related parties, impaired | 0 |  | 0 | 0 |
Total gross loans and leases receivable | 1,451,864 |  | 1,451,864 | 1,432,027 |
Non-accrual troubled debt restructurings | 12,800 |  | 12,800 | 16,200 |
Unfunded commitments, troubled debt restructurings | 0 |  | 0 |  |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | 3,400 |  | 3,400 | 3,900 | 4,400
Performing troubled debt restructurings | 717 |  | 717 | 1,735 | 2,003
Impairments of residual value of leased property |  |  | 0 | 0 | $ 0
SBA loans in the participation sold portfolio, considered impaired | 5,500 |  | 5,500 | 1,100 |
Guaranteed Portion of SBA Loans Sold to Third Parties Total |  |  | 41,200 | 40,200 |
Total amount of outstanding SBA loans sold | 105,100 |  | 105,100 | 78,200 |
Unguaranteed portion of Sold SBA Loans Retained on the Balance Sheet | 32,200 |  | 32,200 | 26,200 |
Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total gross loans and leases receivable | 34,300 |  | 34,300 | 26,800 |
Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 | 0 |
Doubtful |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total gross loans and leases receivable | 0 |  | 0 | 0 |
Loss |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total gross loans and leases receivable | $ 0 |  | $ 0 | $ 0 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of other loans and leases that were sold during the reporting period; excludes gains (losses) on sales of consumer and mortgage loans. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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