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Allowance for Loan and Lease Losses - Investment in Loans and Leases (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 4,672,909,000 $ 4,261,979,000  
Interest income on impaired loans and leases 0 0 $ 0
Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 12,350,000 12,954,000  
Collectively evaluated for impairment 4,349,982,000 3,854,914,000  
Total Loans 4,362,332,000 3,867,868,000  
Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 3,471,000 5,625,000  
Loans acquired with deteriorated credit quality 11,962,000 22,517,000  
Collectively evaluated for impairment 295,144,000 365,969,000  
Total Loans 310,577,000 394,111,000  
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,091,651,000 1,044,619,000  
Commercial and industrial | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 1,759,000 635,000  
Collectively evaluated for impairment 1,038,916,000 964,667,000  
Total Loans 1,040,675,000 965,302,000  
Commercial and industrial | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 276,000 172,000  
Loans acquired with deteriorated credit quality 506,000 448,000  
Collectively evaluated for impairment 50,194,000 78,697,000  
Total Loans 50,976,000 79,317,000  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 2,200,727,000 1,920,841,000  
Commercial real estate | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 6,626,000 8,812,000  
Collectively evaluated for impairment 1,986,354,000 1,661,221,000  
Total Loans 1,992,980,000 1,670,033,000  
Commercial real estate | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 1,372,000 4,081,000  
Loans acquired with deteriorated credit quality 7,481,000 14,368,000  
Collectively evaluated for impairment 198,894,000 232,359,000  
Total Loans 207,747,000 250,808,000  
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,302,941,000 1,219,815,000  
Residential real estate | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 3,965,000 3,507,000  
Collectively evaluated for impairment 1,247,887,000 1,153,148,000  
Total Loans 1,251,852,000 1,156,655,000  
Residential real estate | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 1,823,000 1,372,000  
Loans acquired with deteriorated credit quality 3,975,000 7,701,000  
Collectively evaluated for impairment 45,291,000 54,087,000  
Total Loans 51,089,000 63,160,000  
Consumer and other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 63,123,000 60,054,000  
Consumer and other | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 62,358,000 59,228,000  
Total Loans 62,358,000 59,228,000  
Consumer and other | Acquired Loans and Leases      
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 765,000 826,000  
Total Loans 765,000 826,000  
Finance Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 14,467,000 16,650,000  
Finance Leases | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 14,467,000 16,650,000  
Total Loans 14,467,000 16,650,000  
Finance Leases | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans    
Covered loans | Acquired Loans and Leases      
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 0 0  
Total Loans $ 0 $ 0