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Allowance for Loan and Lease Losses - Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Ending balance $ 40,790   $ 43,410      
Total 4,859,517   4,837,735      
Originated Loans and Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 900   3,762      
Collectively evaluated for impairment 39,789   39,559      
Ending balance 40,689 $ 40,245 43,321 $ 41,111 $ 40,107 $ 39,686
Individually evaluated for impairment 11,678   14,167      
Collectively evaluated for impairment 4,600,520   4,558,370      
Total 4,612,198   4,572,537      
Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 101   89      
Ending balance 101 83 89 114 104 85
Individually evaluated for impairment 3,504   3,438      
Loans acquired with deteriorated credit quality 10,464   11,036      
Collectively evaluated for impairment 233,351   250,724      
Total 247,319   265,198      
Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total 1,043,789   1,077,635      
Commercial and industrial | Originated Loans and Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 300   397      
Collectively evaluated for impairment 11,243   10,820      
Ending balance 11,543 11,523 11,217 12,866 12,431 11,812
Individually evaluated for impairment 1,770   1,864      
Collectively evaluated for impairment 1,000,581   1,032,059      
Total 1,002,351   1,033,923      
Commercial and industrial | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   55      
Ending balance 0 0 55 19 25 25
Individually evaluated for impairment 12   32      
Loans acquired with deteriorated credit quality 184   153      
Collectively evaluated for impairment 41,242   43,527      
Total 41,438   43,712      
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total 2,401,976   2,340,661      
Commercial real estate | Originated Loans and Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 600   3,365      
Collectively evaluated for impairment 20,354   20,118      
Ending balance 20,954 21,045 23,483 20,770 20,402 20,412
Individually evaluated for impairment 5,938   8,388      
Collectively evaluated for impairment 2,229,275   2,153,181      
Total 2,235,213   2,161,569      
Commercial real estate | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 51   0      
Ending balance 51 25 0 25 0 0
Individually evaluated for impairment 861   842      
Loans acquired with deteriorated credit quality 5,800   5,852      
Collectively evaluated for impairment 160,102   172,398      
Total 166,763   179,092      
Residential real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total 1,324,206   1,333,894      
Residential real estate | Originated Loans and Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 6,853   7,317      
Ending balance 6,853 6,404 7,317 6,147 5,972 6,161
Individually evaluated for impairment 3,970   3,915      
Collectively evaluated for impairment 1,281,923   1,288,346      
Total 1,285,893   1,292,261      
Residential real estate | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 44   28      
Ending balance 44 58 28 65 73 54
Individually evaluated for impairment 2,631   2,564      
Loans acquired with deteriorated credit quality 4,480   5,031      
Collectively evaluated for impairment 31,202   34,038      
Total 38,313   41,633      
Consumer and other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total 73,689   70,989      
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 1,339   1,304      
Ending balance 1,339 1,273 1,304 1,328 1,302 1,301
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 72,884   70,228      
Total 72,884   70,228      
Consumer and other | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 6   6      
Ending balance 6 0 6 5 6 6
Individually evaluated for impairment 0   0      
Loans acquired with deteriorated credit quality 0   0      
Collectively evaluated for impairment 805   761      
Total 805   761      
Covered loans | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Ending balance 0   0 0 0 0
Individually evaluated for impairment 0   0      
Loans acquired with deteriorated credit quality 0   0      
Collectively evaluated for impairment 0   0      
Total 0   0      
Finance Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total 15,857   14,556      
Finance Leases | Originated Loans and Leases            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Ending balance 0 0 0 $ 0 $ 0 $ 0
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 15,857   14,556      
Total 15,857   14,556      
Finance Leases | Total Acquired Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Ending balance 0 $ 0        
Total $ 0   $ 0