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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 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans     0    
Loans and leases transferred to third parties total principal amount $ 63,600,000 $ 17,600,000      
Gain (Loss) Recognized on Participation Interest in Originated Loans     $ 0    
Gain on sale of SBA loans     1,591,000 $ 4,400,000 $ 3,999,000
Loan participations purchased on the Corporation's balance sheet 650,000   650,000 1,200,000  
Total amount of outstanding loans transferred to third parties as loan participations 106,400,000   106,400,000 102,700,000  
Total amount of loan participations remaining on the Corporation's balance sheet 181,700,000   181,700,000 106,100,000  
Loans in the participation sold portfolio, considered impaired 0   0 0  
Residential Real Estate Loans Sold, Principal Amount     1,600,000 26,300,000  
Loans to executive officers, directors and their related interests 10,500,000   10,500,000 6,300,000  
New loans granted to executive officers, directors and their related interests     8,300,000 700,000  
Repayments on loans to executive officers, directors and their related interests     4,100,000 1,259,000  
Loans and leases receivable, related parties, impaired 0   0 0  
Total gross loans and leases receivable 1,503,038,000   1,503,038,000 1,451,864,000  
Non-accrual troubled debt restructurings 8,800,000   8,800,000 12,800,000  
Unfunded commitments, troubled debt restructurings 0   0    
Loans and leases receivable, difference between recorded investment and unpaid principal balance 6,600,000   6,600,000 3,400,000 3,900,000
Performing troubled debt restructurings 332,000   332,000 717,000 1,735,000
Impairments of residual value of leased property     0 0 $ 0
SBA loans in the participation sold portfolio, considered impaired 11,100,000   11,100,000 5,500,000  
Guaranteed Portion of SBA Loans Sold to Third Parties Total     16,500,000 41,200,000  
Total amount of outstanding SBA loans sold 100,300,000   100,300,000 105,100,000  
Substandard          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable 32,700,000   32,700,000 34,300,000  
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 4,692,000   4,692,000 0  
Loss          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable 0   $ 0 $ 0  
Commercial and industrial          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Number of Contracts     4 3  
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 4,400,000 $ 675,000  
Total gross loans and leases receivable 429,002,000   $ 429,002,000 450,298,000  
Total consumer and other loans          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Number of Contracts     1    
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 17,000    
Total gross loans and leases receivable 25,361,000   25,361,000 $ 24,741,000  
Commercial real estate — owner occupied          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Number of Contracts       1  
Financing Receivable, Modifications, Post-Modification Recorded Investment       $ 441,000  
Total gross loans and leases receivable $ 200,387,000   $ 200,387,000 $ 176,459,000