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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       $ 52,775       $ 48,147 $ 52,775 $ 48,147  
Charge-offs                 (13,496) (15,561)  
Recoveries                 3,228 2,224  
Net (Charge-offs) Recoveries                 (10,268) (13,337)  
Provision for loan losses $ 982 $ 2,850 $ 4,869 5,183 $ 5,586 $ 2,516 $ 4,848 5,014 13,883 17,965 $ 10,388
Balance at End of Year 56,390       52,775       56,390 52,775 48,147
Commercial real estate                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       19,976       15,043 19,976 15,043  
Charge-offs                 (2,304) (3,114)  
Recoveries                 810 692  
Net (Charge-offs) Recoveries                 (1,494) (2,422)  
Provision for loan losses                 8,753 7,355  
Balance at End of Year 27,235       19,976       27,235 19,976 15,043
Commercial and industrial                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       10,810       10,853 10,810 10,853  
Charge-offs                 (4,709) (6,810)  
Recoveries                 654 722  
Net (Charge-offs) Recoveries                 (4,055) (6,088)  
Provision for loan losses                 2,211 6,045  
Balance at End of Year 8,966       10,810       8,966 10,810 10,853
Commercial construction                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       13,999       12,625 13,999 12,625  
Charge-offs                 (2,571) (1,877)  
Recoveries                 851 21  
Net (Charge-offs) Recoveries                 (1,720) (1,856)  
Provision for loan losses                 888 3,230  
Balance at End of Year 13,167       13,999       13,167 13,999 12,625
Consumer real estate                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       6,095       8,400 6,095 8,400  
Charge-offs                 (2,274) (1,657)  
Recoveries                 342 433  
Net (Charge-offs) Recoveries                 (1,932) (1,224)  
Provision for loan losses                 1,316 (1,081)  
Balance at End of Year 5,479       6,095       5,479 6,095 8,400
Other consumer                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of year       $ 1,895       $ 1,226 1,895 1,226  
Charge-offs                 (1,638) (2,103)  
Recoveries                 571 356  
Net (Charge-offs) Recoveries                 (1,067) (1,747)  
Provision for loan losses                 715 2,416  
Balance at End of Year $ 1,543       $ 1,895       $ 1,543 $ 1,895 $ 1,226