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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, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
loans
Jun. 30, 2017
USD ($)
loans
Dec. 31, 2017
USD ($)
Financing Receivable, Recorded Investment          
SBA loans in the participation sold portfolio, considered impaired $ 9,000,000   $ 9,000,000   $ 11,100,000
Guaranteed portion of SBA loans sold to third parties 3,200,000 $ 5,900,000 6,300,000 $ 9,200,000  
Total amount of outstanding SBA loans sold 89,500,000   89,500,000   100,300,000
Loans and leases transferred to third parties total principal amount 14,800,000 $ 8,700,000 34,400,000 20,700,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans     0 $ 0  
Total amount of outstanding loans transferred to third parties as loan participations 112,700,000   112,700,000   106,400,000
Total amount of loan participations remaining on the Corporations balance sheet 193,700,000   193,700,000   181,700,000
Loans in the participation sold portfolio, considered impaired 0   0   0
Loan participations purchased on the Corporation's balance sheet 610,000   610,000   650,000
Total gross loans and leases receivable 1,596,598,000   1,596,598,000   1,503,038,000
Non-accrual troubled debt restructurings 8,400,000   8,400,000   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 11,500,000   $ 11,500,000   6,600,000
Performing troubled debt restructurings 249,000   249,000   332,000
Substandard          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 42,500,000   42,500,000   32,700,000
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 0   0   4,692,000
Loss          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 0   0   0
Consumer and other:          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable 29,037,000   29,037,000   25,361,000
Commercial and industrial          
Financing Receivable, Recorded Investment          
Total gross loans and leases receivable $ 447,540,000   $ 447,540,000   $ 429,002,000