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Allowance for Loan and Lease Losses (Details 3) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 4,261,979,000 $ 3,774,832,000  
Interest income on impaired loans and leases 0 0 $ 0
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,044,619,000 941,133,000  
Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,920,841,000 1,649,161,000  
Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,219,815,000 1,096,002,000  
Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 60,054,000 59,644,000  
Finance Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 16,650,000 14,861,000  
Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 0 14,031,000  
Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 12,954,000 9,131,000  
Collectively evaluated for impairment 3,854,914,000 3,304,427,000  
Total Loans 3,867,868,000 3,313,558,000  
Originated Loans and Leases | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 635,000 1,206,000  
Collectively evaluated for impairment 964,667,000 855,117,000  
Total Loans 965,302,000 856,323,000  
Originated Loans and Leases | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 8,812,000 5,655,000  
Collectively evaluated for impairment 1,661,221,000 1,351,567,000  
Total Loans 1,670,033,000 1,357,222,000  
Originated Loans and Leases | Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 3,507,000 2,270,000  
Collectively evaluated for impairment 1,153,148,000 1,024,149,000  
Total Loans 1,156,655,000 1,026,419,000  
Originated Loans and Leases | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 59,228,000 58,733,000  
Total Loans 59,228,000 58,733,000  
Originated Loans and Leases | Finance Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 16,650,000 14,861,000  
Total Loans 16,650,000 14,861,000  
Originated Loans and Leases | Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 0 0  
Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 5,625,000 7,050,000  
Loans acquired with deteriorated credit quality 22,517,000 26,507,000  
Collectively evaluated for impairment 365,969,000 427,717,000  
Total Loans 394,111,000 461,274,000  
Acquired Loans and Leases | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 172,000 647,000  
Loans acquired with deteriorated credit quality 448,000 567,000  
Collectively evaluated for impairment 78,697,000 83,596,000  
Total Loans 79,317,000 84,810,000  
Acquired Loans and Leases | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 4,081,000 5,226,000  
Loans acquired with deteriorated credit quality 14,368,000 9,335,000  
Collectively evaluated for impairment 232,359,000 277,378,000  
Total Loans 250,808,000 291,939,000  
Acquired Loans and Leases | Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 1,372,000 1,177,000  
Loans acquired with deteriorated credit quality 7,701,000 3,801,000  
Collectively evaluated for impairment 54,087,000 64,605,000  
Total Loans 63,160,000 69,583,000  
Acquired Loans and Leases | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Loans acquired with deteriorated credit quality 0 0  
Collectively evaluated for impairment 826,000 911,000  
Total Loans 826,000 911,000  
Acquired Loans and Leases | Finance Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 0  
Acquired Loans and Leases | Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Loans acquired with deteriorated credit quality 0 12,804,000  
Collectively evaluated for impairment 0 1,227,000  
Total Loans $ 0 $ 14,031,000