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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 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
loans
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment          
Financing Receivable, Modifications, Number of Contracts   0   0  
SBA loans in the participation sold portfolio, considered impaired $ 11,900,000   $ 11,900,000   $ 5,500,000
Guaranteed Portion of SBA Loans Sold to Third Parties Total 6,300,000 $ 3,300,000 15,500,000 $ 36,400,000  
Total amount of outstanding SBA loans sold 103,300,000   103,300,000   105,100,000
Loans and leases transferred to third parties total principal amount 9,000,000 7,900,000 17,000,000 17,700,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans     0 0  
Total amount of outstanding loans transferred to third parties as loan participations 91,700,000   91,700,000   102,700,000
Total amount of loan participations remaining on the Corporations balance sheet 146,200,000   146,200,000   106,100,000
Loans in the participation sold portfolio, considered impaired 0   0   0
Loan participations purchased on the Corporation's balance sheet 669,000   669,000   1,200,000
Residential Real Estate Loans Sold, Principal Amount 0 $ 8,000,000 1,600,000 $ 15,200,000  
Total gross loans and leases receivable 1,468,067,000   1,468,067,000   1,451,864,000
Non-accrual troubled debt restructurings 10,900,000   10,900,000   12,800,000
Unfunded commitments, troubled debt restructurings 0   $ 0    
Troubled debt restructurings, subsequent default, number of loans | loans     0    
Loans and leases receivable, difference between recorded investment and unpaid principal balance 4,500,000   $ 4,500,000   3,400,000
Performing troubled debt restructurings 275,000   275,000   717,000
Substandard          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 36,700,000   36,700,000   34,300,000
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 5,055,000   5,055,000   0
Loss          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 0   $ 0   0
Consumer and other:          
Financing Receivable, Recorded Investment          
Financing Receivable, Modifications, Number of Contracts     1    
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 17,000    
Total gross loans and leases receivable $ 25,223,000   $ 25,223,000   24,741,000
Commercial and industrial          
Financing Receivable, Recorded Investment          
Financing Receivable, Modifications, Number of Contracts 2   4    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 800,000   $ 4,400,000    
Total gross loans and leases receivable $ 447,223,000   $ 447,223,000   $ 450,298,000