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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 60,517 $ 55,351 $ 56,390 $ 52,775
Charge-offs (1,234) (2,660) (11,311) (11,423)
Recoveries 811 1,171 3,198 2,459
Net (Charge-offs)/ Recoveries (423) (1,489) (8,113) (8,964)
Provision for loan losses 462 2,850 12,279 12,901
Balance at End of Period 60,556 56,712 60,556 56,712
Commercial real estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 31,232 24,358 27,235 19,976
Charge-offs (141) (37) (373) (2,100)
Recoveries 64 182 293 415
Net (Charge-offs)/ Recoveries (77) 145 (80) (1,685)
Provision for loan losses 1,735 472 5,735 6,684
Balance at End of Period 32,890 24,975 32,890 24,975
Commercial and industrial        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,874 9,256 8,966 10,810
Charge-offs (181) (644) (8,403) (4,041)
Recoveries 504 243 985 499
Net (Charge-offs)/ Recoveries 323 (401) (7,418) (3,542)
Provision for loan losses (971) 859 8,678 2,446
Balance at End of Period 10,226 9,714 10,226 9,714
Commercial construction        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 11,676 13,944 13,167 13,999
Charge-offs 0 (1,453) (321) (2,097)
Recoveries 4 473 1,134 842
Net (Charge-offs)/ Recoveries 4 (980) 813 (1,255)
Provision for loan losses (765) 1,951 (3,065) 2,171
Balance at End of Period 10,915 14,915 10,915 14,915
Consumer real estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 5,241 5,803 5,479 6,095
Charge-offs (487) (101) (916) (1,957)
Recoveries 70 91 393 270
Net (Charge-offs)/ Recoveries (417) (10) (523) (1,687)
Provision for loan losses 214 (262) 82 1,123
Balance at End of Period 5,038 5,531 5,038 5,531
Other consumer        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,494 1,990 1,543 1,895
Charge-offs (425) (425) (1,298) (1,228)
Recoveries 169 182 393 433
Net (Charge-offs)/ Recoveries (256) (243) (905) (795)
Provision for loan losses 249 (170) 849 477
Balance at End of Period $ 1,487 $ 1,577 $ 1,487 $ 1,577