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Allowance for Loan and Lease Losses - Recorded Investment In Loans and Leases By Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 4,494,234 $ 4,261,979
Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 11,217 12,954
Collectively evaluated for impairment 4,159,758 3,854,914
Total 4,170,975 3,867,868
Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 3,474 5,625
Loans acquired with deteriorated credit quality 14,646 22,517
Collectively evaluated for impairment 305,139 365,969
Total 323,259 394,111
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,039,886 1,044,619
Commercial and industrial | Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,425 635
Collectively evaluated for impairment 984,977 964,667
Total 986,402 965,302
Commercial and industrial | Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 0 172
Loans acquired with deteriorated credit quality 353 448
Collectively evaluated for impairment 53,131 78,697
Total 53,484 79,317
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 2,091,145 1,920,841
Commercial real estate | Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,396 8,812
Collectively evaluated for impairment 1,870,320 1,661,221
Total 1,876,716 1,670,033
Commercial real estate | Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,109 4,081
Loans acquired with deteriorated credit quality 7,711 14,368
Collectively evaluated for impairment 204,609 232,359
Total 214,429 250,808
Residential real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,285,247 1,219,815
Residential real estate | Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 3,396 3,507
Collectively evaluated for impairment 1,227,379 1,153,148
Total 1,230,775 1,156,655
Residential real estate | Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,365 1,372
Loans acquired with deteriorated credit quality 6,582 7,701
Collectively evaluated for impairment 46,525 54,087
Total 54,472 63,160
Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 62,434 60,054
Consumer and other | Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 61,560 59,228
Total 61,560 59,228
Consumer and other | Total Acquired 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 874 826
Total 874 826
Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 15,522 16,650
Leases | Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 15,522 16,650
Total 15,522 16,650
Leases | Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Covered Loans | Total Acquired 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