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Allowance for Loan and Lease Losses - Investment in Loans and Leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 4,837,735,000 $ 4,672,909,000  
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 14,167,000 12,350,000  
Collectively evaluated for impairment 4,558,370,000 4,349,982,000  
Total Loans 4,572,537,000 4,362,332,000  
Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 3,438,000 3,471,000  
Loans acquired with deteriorated credit quality 11,036,000 11,962,000  
Collectively evaluated for impairment 250,724,000 295,144,000  
Total Loans 265,198,000 310,577,000  
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,077,635,000 1,091,651,000  
Commercial and industrial | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 1,864,000 1,759,000  
Collectively evaluated for impairment 1,032,059,000 1,038,916,000  
Total Loans 1,033,923,000 1,040,675,000  
Commercial and industrial | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 32,000 276,000  
Loans acquired with deteriorated credit quality 153,000 506,000  
Collectively evaluated for impairment 43,527,000 50,194,000  
Total Loans 43,712,000 50,976,000  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 2,340,661,000 2,200,727,000  
Commercial real estate | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 8,388,000 6,626,000  
Collectively evaluated for impairment 2,153,181,000 1,986,354,000  
Total Loans 2,161,569,000 1,992,980,000  
Commercial real estate | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 842,000 1,372,000  
Loans acquired with deteriorated credit quality 5,852,000 7,481,000  
Collectively evaluated for impairment 172,398,000 198,894,000  
Total Loans 179,092,000 207,747,000  
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 1,333,894,000 1,302,941,000  
Residential real estate | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 3,915,000 3,965,000  
Collectively evaluated for impairment 1,288,346,000 1,247,887,000  
Total Loans 1,292,261,000 1,251,852,000  
Residential real estate | Acquired Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 2,564,000 1,823,000  
Loans acquired with deteriorated credit quality 5,031,000 3,975,000  
Collectively evaluated for impairment 34,038,000 45,291,000  
Total Loans 41,633,000 51,089,000  
Consumer and other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 70,989,000 63,123,000  
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 70,228,000 62,358,000  
Total Loans 70,228,000 62,358,000  
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 761,000 765,000  
Total Loans 761,000 765,000  
Finance Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 14,556,000 14,467,000  
Finance Leases | Originated Loans and Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 14,556,000 14,467,000  
Total Loans 14,556,000 14,467,000  
Finance Leases | 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