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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 59,046 $ 55,816 $ 56,390 $ 52,775
Charge-offs (8,632) (5,822) (10,076) (8,763)
Recoveries 758 488 2,386 1,287
Net (Charge-offs)/ Recoveries (7,874) (5,334) (7,690) (7,476)
Provision for loan losses 9,345 4,869 11,817 10,052
Balance at End of Period 60,517 55,351 60,517 55,351
Commercial real estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 30,963 20,570 27,235 19,976
Charge-offs (237) (1,673) (232) (2,063)
Recoveries 185 155 228 233
Net (Charge-offs)/ Recoveries (52) (1,518) (4) (1,830)
Provision for loan losses 321 5,306 4,001 6,212
Balance at End of Period 31,232 24,358 31,232 24,358
Commercial and industrial        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,472 13,244 8,966 10,810
Charge-offs (7,392) (2,682) (8,222) (3,396)
Recoveries 362 69 480 255
Net (Charge-offs)/ Recoveries (7,030) (2,613) (7,742) (3,141)
Provision for loan losses 7,432 (1,375) 9,650 1,587
Balance at End of Period 10,874 9,256 10,874 9,256
Commercial construction        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,721 14,102 13,167 13,999
Charge-offs (321) 0 (321) (644)
Recoveries 1 113 1,130 369
Net (Charge-offs)/ Recoveries (320) 113 809 (275)
Provision for loan losses 1,275 (271) (2,300) 220
Balance at End of Period 11,676 13,944 11,676 13,944
Consumer real estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 5,418 5,956 5,479 6,095
Charge-offs (268) (1,097) (429) (1,856)
Recoveries 85 76 323 179
Net (Charge-offs)/ Recoveries (183) (1,021) (106) (1,677)
Provision for loan losses 6 868 (132) 1,385
Balance at End of Period 5,241 5,803 5,241 5,803
Other consumer        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,472 1,944 1,543 1,895
Charge-offs (414) (370) (872) (804)
Recoveries 125 75 225 251
Net (Charge-offs)/ Recoveries (289) (295) (647) (553)
Provision for loan losses 311 341 598 648
Balance at End of Period $ 1,494 $ 1,990 $ 1,494 $ 1,990