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Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 41,856 $ 49,309
Recorded Investment With Related Allowance 114,335 114,857
Total Recorded Investment 156,191 164,166
Unpaid Contractual Principal Balance 166,654 175,198
Related Allowance 28,508 14,561
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 10,241 9,946
Recorded Investment With Related Allowance 76,929 75,553
Total Recorded Investment 87,170 85,499
Unpaid Contractual Principal Balance 92,073 90,269
Related Allowance 24,817 11,044
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 24,551 30,613
Recorded Investment With Related Allowance 30,168 30,238
Total Recorded Investment 54,719 60,851
Unpaid Contractual Principal Balance 58,628 64,680
Related Allowance 2,987 2,735
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 22,751 28,709
Recorded Investment With Related Allowance 29,705 29,771
Total Recorded Investment 52,456 58,480
Unpaid Contractual Principal Balance 56,365 62,286
Related Allowance 2,972 2,718
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,800 1,904
Recorded Investment With Related Allowance 463 467
Total Recorded Investment 2,263 2,371
Unpaid Contractual Principal Balance 2,263 2,394
Related Allowance 15 17
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,226 5,654
Recorded Investment With Related Allowance 6,623 8,402
Total Recorded Investment 12,849 14,056
Unpaid Contractual Principal Balance 13,838 15,332
Related Allowance 632 718
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 838 3,096
Recorded Investment With Related Allowance 615 664
Total Recorded Investment 1,453 3,760
Unpaid Contractual Principal Balance 2,115 4,917
Related Allowance 72 64
Consumer loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 838 3,096
Recorded Investment With Related Allowance 615 664
Total Recorded Investment 1,453 3,760
Unpaid Contractual Principal Balance 2,115 4,917
Related Allowance $ 72 $ 64