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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 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
loans
Sep. 30, 2017
USD ($)
loans
Dec. 31, 2017
USD ($)
Financing Receivable, Recorded Investment          
SBA loans in the participation sold portfolio, considered impaired $ 12,000,000   $ 12,000,000   $ 11,100,000
Guaranteed portion of SBA loans sold to third parties 4,500,000 $ 6,300,000 10,800,000 $ 15,500,000  
Total amount of outstanding SBA loans sold 91,100,000   91,100,000   100,300,000
Loans and leases transferred to third parties total principal amount 17,200,000 $ 15,900,000 51,600,000 36,600,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans     0 $ 0  
Total amount of outstanding loans transferred to third parties as loan participations 125,700,000   125,700,000   106,400,000
Total amount of loan participations remaining on the Corporations balance sheet 206,000,000   206,000,000   181,700,000
Loans in the participation sold portfolio, considered impaired 0   0   0
Loan participations purchased on the Corporation's balance sheet 590,000   590,000   650,000
Total gross loans and leases receivable 1,600,109,000   1,600,109,000   1,503,038,000
Non-accrual troubled debt restructurings 8,100,000   8,100,000   8,800,000
Unfunded commitments, troubled debt restructurings 0   $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans     0 0  
Loans and leases receivable, difference between recorded investment and unpaid principal balance 10,400,000   $ 10,400,000   6,600,000
Performing troubled debt restructurings 187,000   187,000   332,000
Substandard          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 38,800,000   38,800,000   32,700,000
Doubtful          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 0   0   4,700,000
Consumer and other:          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 31,839,000   31,839,000   25,361,000
Commercial and industrial          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable $ 457,932,000   $ 457,932,000   $ 429,002,000