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Business Combinations and Divestitures - Additional Information (Details)
 12 Months Ended
Jan. 19, 2018
Dec. 09, 2017
USD ($)
locations
Oct. 06, 2017
USD ($)
Branch
Mar. 31, 2017
USD ($)
Sep. 01, 2016
USD ($)
Aug. 01, 2016
USD ($)
Mar. 03, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                    
Recorded investment, without valuation allowance               $ 24,720,000 $ 21,528,000  
Loans               2,810,856,000 2,027,624,000  
Goodwill               44,126,000 28,810,000  
Business acquisition, related costs       $ 400,000            
Origination fees               2,944,000 2,772,000  
PCI Loans                    
Business Acquisition [Line Items]                    
Loans               15,598,000 26,907,000  
Valley Bank & Trust                    
Business Acquisition [Line Items]                    
Number of locations | locations   7                
Valley Bancorp, Inc.                    
Business Acquisition [Line Items]                    
Date of acquisition completion date   Dec. 09, 2017                
Goodwill   $ 10,523,000                
Business acquisition, related costs               1,251,000    
Acquired loans at acquisition   171,199,000                
Intangible asset   6,072,000                
Total consideration transferred   40,075,000                
Valley Bancorp, Inc. | PCI Loans                    
Business Acquisition [Line Items]                    
Acquired loans at acquisition   1,453,000                
Valley Bancorp, Inc. | Banking                    
Business Acquisition [Line Items]                    
Goodwill   $ 10,523,000                
Finite lived intangible assets, Amortization period   10 years                
Independent Bank - Colorado Branches                    
Business Acquisition [Line Items]                    
Date of acquisition completion date     Oct. 06, 2017              
Goodwill     $ 5,817,000              
Finite lived intangible assets, Amortization period     10 years              
Business acquisition, related costs               437,000    
Number of branches acquired | Branch     9              
Aggregate deposit premium     $ 6,771,000              
Aggregate deposit premium, percentage     4.20%              
Acquired loans at acquisition     $ 95,794,000              
Intangible asset     3,255,000              
Independent Bank - Colorado Branches | PCI Loans                    
Business Acquisition [Line Items]                    
Acquired loans at acquisition     $ 0              
Southern Transportation Insurance Agency, Ltd.                    
Business Acquisition [Line Items]                    
Cash paid for business acquisition         $ 2,150,000          
Southern Transportation Insurance Agency, Ltd. | Banking                    
Business Acquisition [Line Items]                    
Goodwill         $ 570,000          
Finite lived intangible assets, Amortization period         8 years          
Intangible asset         $ 1,580,000          
ColoEast Bankshares, Inc.                    
Business Acquisition [Line Items]                    
Goodwill                 12,272,000  
Business acquisition, related costs                 1,618,000  
Acquired loans at acquisition           $ 460,775,000        
Cash paid for business acquisition           $ 70,000,000     70,000,000  
Intangible asset                 $ 7,238,000  
Business acquisition, percentage of voting interests acquired           100.00%        
TARP Preferred stock, redemption date                 Aug. 31, 2016  
Total consideration transferred                 $ 80,500,000  
ColoEast Bankshares, Inc. | Preferred Stock                    
Business Acquisition [Line Items]                    
Preferred stock issued           $ 10,500,000     10,500,000  
ColoEast Bankshares, Inc. | PCI Loans                    
Business Acquisition [Line Items]                    
Acquired loans at acquisition           19,293,000        
ColoEast Bankshares, Inc. | Banking                    
Business Acquisition [Line Items]                    
Goodwill           $ 12,272,000        
Finite lived intangible assets, Amortization period           10 years        
Doral Money Acquisition                    
Business Acquisition [Line Items]                    
Business acquisition, related costs                   $ 243,000
Business acquisition, percentage of voting interests acquired             100.00%      
CLO management contract acquired - Assets under management             $ 700,000,000      
Total consideration transferred             $ 135,864,000     $ 135,864,000
Substandard                    
Business Acquisition [Line Items]                    
Loans               59,679,000 $ 56,116,000  
Triumph Healthcare Finance | Loans Held for Sale                    
Business Acquisition [Line Items]                    
Recorded investment, without valuation allowance               245,000    
Triumph Healthcare Finance | Substandard | Loans Held for Sale                    
Business Acquisition [Line Items]                    
Loans               5,431,000    
Triumph Healthcare Finance | Subsequent Event                    
Business Acquisition [Line Items]                    
Disposal of group agreement date Jan. 19, 2018                  
Triumph Capital Advisors, LLC                    
Business Acquisition [Line Items]                    
Portion of consideration received       $ 10,500,000            
Percentage of annual earn-out payment       3.00%            
Maximum earn-out amount       $ 2,500,000            
Contingent consideration asset, estimated fair value       1,623,000       $ 1,737,000    
Triumph Capital Advisors, LLC | Loans Receivable                    
Business Acquisition [Line Items]                    
Portion of consideration received       $ 10,500,000            
Term credit facility, maturity date       Mar. 31, 2023            
Origination fees       $ 25,000            
Triumph Capital Advisors, LLC | Interest Rate Floor | Loans Receivable                    
Business Acquisition [Line Items]                    
Term credit facility, interest rate       5.50%