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Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 43,810 $ 33,825
Recorded Investment With Related Allowance 129,244 122,800
Total Recorded Investment 173,054 156,625
Unpaid Contractual Principal Balance 189,482 165,918
Related Allowance 37,599 33,025
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 12,661 8,339
Recorded Investment With Related Allowance 97,878 89,513
Total Recorded Investment 110,539 97,852
Unpaid Contractual Principal Balance 123,876 104,007
Related Allowance 35,730 29,684
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 24,211 17,535
Recorded Investment With Related Allowance 25,913 26,063
Total Recorded Investment 50,124 43,598
Unpaid Contractual Principal Balance 52,030 45,597
Related Allowance 1,287 2,628
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 23,857 16,732
Recorded Investment With Related Allowance 25,913 25,606
Total Recorded Investment 49,770 42,338
Unpaid Contractual Principal Balance 51,676 44,337
Related Allowance 1,287 2,615
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 354 803
Recorded Investment With Related Allowance 0 457
Total Recorded Investment 354 1,260
Unpaid Contractual Principal Balance 354 1,260
Related Allowance 0 13
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,752 7,826
Recorded Investment With Related Allowance 4,904 6,078
Total Recorded Investment 11,656 13,904
Unpaid Contractual Principal Balance 12,740 14,948
Related Allowance 525 600
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 186 125
Recorded Investment With Related Allowance 549 1,146
Total Recorded Investment 735 1,271
Unpaid Contractual Principal Balance 836 1,366
Related Allowance 57 113
Consumer loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 186 125
Recorded Investment With Related Allowance 549 1,146
Total Recorded Investment 735 1,271
Unpaid Contractual Principal Balance 836 1,366
Related Allowance $ 57 $ 113