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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
loans
Mar. 31, 2017
USD ($)
loans
Dec. 31, 2017
USD ($)
Financing Receivable, Recorded Investment      
SBA loans in the participation sold portfolio, considered impaired $ 8,000,000   $ 11,100,000
Guaranteed portion of SBA loans sold to third parties 3,100,000 $ 3,300,000  
Total amount of outstanding SBA loans sold 97,700,000   100,300,000
Loans and leases transferred to third parties total principal amount 19,700,000 12,000,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans 0 $ 0  
Total amount of outstanding loans transferred to third parties as loan participations 108,700,000   106,400,000
Total amount of loan participations remaining on the Corporations balance sheet 187,800,000   181,700,000
Loans in the participation sold portfolio, considered impaired 0   0
Loan participations purchased on the Corporation's balance sheet 650,000   650,000
Total gross loans and leases receivable 1,565,161,000   1,503,038,000
Non-accrual troubled debt restructurings 8,600,000   8,800,000
Unfunded commitments, troubled debt restructurings $ 0    
Financing Receivable, Modifications, Number of Contracts | loans 0 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 3  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 878,000  
Loans and leases receivable, difference between recorded investment and unpaid principal balance $ 10,400,000   6,600,000
Performing troubled debt restructurings 261,000   332,000
Substandard      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 30,600,000   32,700,000
Special Mention      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0   0
Doubtful      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0   4,692,000
Loss      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0   0
Consumer and other:      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 28,987,000   25,361,000
Commercial and industrial      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable $ 443,005,000   $ 429,002,000