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Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]    
Current $ 6,144,072 $ 5,890,141
Past due 60,064 58,878
Non - performing 49,983 46,073
Total Loans 6,204,136 5,949,019
Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Current 2,886,051 2,903,997
Past due 36,146 17,835
Non - performing 33,740 12,052
Total Loans 2,922,197 2,921,832
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Current 1,620,286 1,482,473
Past due 6,568 10,943
Non - performing 4,206 8,960
Total Loans 1,626,854 1,493,416
Commercial construction    
Financing Receivable, Past Due [Line Items]    
Current 313,190 243,004
Past due 1,623 14,193
Non - performing 1,143 14,193
Total Loans 314,813 257,197
Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Current 760,601 717,447
Past due 10,281 9,232
Non - performing 7,384 7,128
Total Loans 770,882 726,679
Home equity    
Financing Receivable, Past Due [Line Items]    
Current 469,805 465,152
Past due 5,219 6,410
Non - performing 3,492 3,698
Total Loans 475,024 471,562
Installment and other consumer    
Financing Receivable, Past Due [Line Items]    
Current 74,233 67,281
Past due 227 265
Non - performing 18 42
Total Loans 74,460 67,546
Consumer construction    
Financing Receivable, Past Due [Line Items]    
Current 11,535 8,416
Past due 0 0
Non - performing 0 0
Total Loans 11,535 8,416
Loans Held for Sale    
Financing Receivable, Past Due [Line Items]    
Current 8,371 2,371
Past due 0 0
Non - performing 0 0
Total Loans 8,371 2,371
30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due 7,442 8,473
30 to 59 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Past due 1,845 3,638
30 to 59 Days Past Due | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Past due 2,049 1,000
30 to 59 Days Past Due | Commercial construction    
Financing Receivable, Past Due [Line Items]    
Past due 480 0
30 to 59 Days Past Due | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Past due 1,566 1,584
30 to 59 Days Past Due | Home equity    
Financing Receivable, Past Due [Line Items]    
Past due 1,370 2,103
30 to 59 Days Past Due | Installment and other consumer    
Financing Receivable, Past Due [Line Items]    
Past due 132 148
30 to 59 Days Past Due | Consumer construction    
Financing Receivable, Past Due [Line Items]    
Past due 0 0
30 to 59 Days Past Due | Loans Held for Sale    
Financing Receivable, Past Due [Line Items]    
Past due 0 0
60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due 2,639 4,332
60 to 89 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Past due 561 2,145
60 to 89 Days Past Due | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Past due 313 983
60 to 89 Days Past Due | Commercial construction    
Financing Receivable, Past Due [Line Items]    
Past due 0 0
60 to 89 Days Past Due | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Past due 1,331 520
60 to 89 Days Past Due | Home equity    
Financing Receivable, Past Due [Line Items]    
Past due 357 609
60 to 89 Days Past Due | Installment and other consumer    
Financing Receivable, Past Due [Line Items]    
Past due 77 75
60 to 89 Days Past Due | Consumer construction    
Financing Receivable, Past Due [Line Items]    
Past due 0 0
60 to 89 Days Past Due | Loans Held for Sale    
Financing Receivable, Past Due [Line Items]    
Past due $ 0 $ 0