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Allowance for Loan and Lease Losses (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 4,422,513 $ 4,261,979
Commercial and industrial, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,128,042 1,044,619
Commercial real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,948,217 1,920,841
Residential real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,270,065 1,219,815
Consumer and other, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 60,258 60,054
Finance Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 15,931 16,650
Originated Loans and Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 11,806 12,954
Collectively evaluated for impairment 4,062,866 3,854,914
Total 4,074,672 3,867,868
Originated Loans and Leases | Commercial and industrial, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,583 635
Collectively evaluated for impairment 1,065,325 964,667
Total 1,066,908 965,302
Originated Loans and Leases | Commercial real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,523 8,812
Collectively evaluated for impairment 1,713,139 1,661,221
Total 1,719,662 1,670,033
Originated Loans and Leases | Residential real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 3,700 3,507
Collectively evaluated for impairment 1,209,109 1,153,148
Total 1,212,809 1,156,655
Originated Loans and Leases | Consumer and other, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 59,362 59,228
Total 59,362 59,228
Originated Loans and Leases | Finance Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 15,931 16,650
Total 15,931 16,650
Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 3,070 5,625
Loans acquired with deteriorated credit quality 16,597 22,517
Collectively evaluated for impairment 328,174 365,969
Total 347,841 394,111
Total Acquired Loans | Commercial and industrial, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 102 172
Loans acquired with deteriorated credit quality 228 448
Collectively evaluated for impairment 60,804 78,697
Total 61,134 79,317
Total Acquired Loans | Commercial real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,454 4,081
Loans acquired with deteriorated credit quality 9,450 14,368
Collectively evaluated for impairment 217,651 232,359
Total 228,555 250,808
Total Acquired Loans | Residential real estate, total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,514 1,372
Loans acquired with deteriorated credit quality 6,919 7,701
Collectively evaluated for impairment 48,823 54,087
Total 57,256 63,160
Total Acquired Loans | Consumer and other, total    
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 896 826
Total 896 826
Total Acquired Loans | Finance Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Total Acquired Loans | Covered Loans    
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 $ 0 $ 0