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Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current $ 5,730,426 $ 5,563,123
Total nonaccrual loans 36,669 42,635
Total past due 50,513 52,089
Total Loans 5,780,939 5,615,212
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 2,653,680 2,479,513
Total nonaccrual loans 7,199 16,172
Total past due 10,962 18,963
Total Loans 2,664,642 2,498,476
Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 1,381,657 1,391,475
Total nonaccrual loans 17,418 8,071
Total past due 19,626 9,560
Total Loans 1,401,283 1,401,035
Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 424,254 450,410
Total nonaccrual loans 2,313 4,927
Total past due 2,500 5,474
Total Loans 426,754 455,884
Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 694,800 689,635
Total nonaccrual loans 7,056 9,918
Total past due 11,343 12,347
Total Loans 706,143 701,982
Home Equity Loan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 479,190 476,866
Total nonaccrual loans 2,642 3,439
Total past due 5,770 5,418
Total Loans 484,960 482,284
Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 69,756 65,525
Total nonaccrual loans 41 108
Total past due 312 327
Total Loans 70,068 65,852
Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 3,969 5,906
Total nonaccrual loans 0 0
Total past due 0 0
Total Loans 3,969 5,906
Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 23,120 3,793
Total nonaccrual loans 0 0
Total past due 0 0
Total Loans 23,120 3,793
30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 10,824 6,598
30 to 59 Days Past Due | Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 2,846 2,032
30 to 59 Days Past Due | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,454 1,061
30 to 59 Days Past Due | Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 187 547
30 to 59 Days Past Due | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 3,506 1,312
30 to 59 Days Past Due | Home Equity Loan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 2,620 1,470
30 to 59 Days Past Due | Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 211 176
30 to 59 Days Past Due | Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
30 to 59 Days Past Due | Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 3,020 2,856
60 to 89 Days Past Due | Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 917 759
60 to 89 Days Past Due | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 754 428
60 to 89 Days Past Due | Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
60 to 89 Days Past Due | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 781 1,117
60 to 89 Days Past Due | Home Equity Loan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 508 509
60 to 89 Days Past Due | Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 60 43
60 to 89 Days Past Due | Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
60 to 89 Days Past Due | Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 0 $ 0