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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, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loans
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment          
Financing Receivable, Modifications, Number of Contracts       0  
SBA loans in the participation sold portfolio, considered impaired $ 11,600,000   $ 11,600,000   $ 5,500,000
Guaranteed Portion of SBA Loans Sold to Third Parties Total 5,900,000 $ 20,000,000 9,200,000 $ 33,100,000  
Total amount of outstanding SBA loans sold 101,200,000   101,200,000   105,100,000
Loans and leases transferred to third parties total principal amount 2,400,000 9,400,000 7,900,000 9,800,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans     0 0  
Total amount of outstanding loans transferred to third parties as loan participations 89,800,000   89,800,000   102,700,000
Total amount of loan participations remaining on the Corporations balance sheet 144,700,000   144,700,000   106,100,000
Loans in the participation sold portfolio, considered impaired 0   0   0
Loan participations purchased on the Corporation's balance sheet 688,000   688,000   1,200,000
Residential Real Estate Loans Sold, Principal Amount 597,000 $ 8,000,000 1,600,000 $ 15,200,000  
Total gross loans and leases receivable 1,459,484,000   1,459,484,000   1,451,864,000
Non-accrual troubled debt restructurings 12,200,000   12,200,000   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 8,300,000   $ 8,300,000   3,400,000
Performing troubled debt restructurings 702,000   702,000   717,000
Substandard          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 39,000,000   39,000,000   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 6,658,000   6,658,000   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 25,949,000   $ 25,949,000   24,741,000
Commercial and industrial          
Financing Receivable, Recorded Investment          
Financing Receivable, Modifications, Number of Contracts     2    
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 3,574,000    
Total gross loans and leases receivable $ 437,955,000   $ 437,955,000   $ 450,298,000