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Business Combinations and Divestitures - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 23, 2017
USD ($)
Branch
Mar. 31, 2017
USD ($)
Sep. 01, 2016
USD ($)
Aug. 01, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Origination fees           $ 3,164,000 $ 2,772,000
Business acquisition, related costs   $ 400,000          
Goodwill           $ 28,810,000 28,810,000
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          
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%          
Independent Bank Colorado Branches | TBK Bank SSB              
Business Acquisition [Line Items]              
Number of branches acquired | Branch 9            
Date of acquisition agreement date           Jun. 23, 2017  
Business combination loans acquired $ 100,000,000            
Business combination deposits assumed 168,000,000            
Estimated aggregate deposit premium $ 7,000,000            
Estimated aggregate deposit premium, percentage 4.17%            
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]              
Intangible asset     1,580,000        
Goodwill     $ 570,000        
ColoEast Bankshares, Inc.              
Business Acquisition [Line Items]              
Business combination deposits assumed             652,952,000
Business acquisition, related costs         $ 1,618,000    
Cash paid for business acquisition       $ 70,000,000     70,000,000
Intangible asset             7,238,000
Goodwill             12,272,000
Business acquisition, percentage of voting interests acquired       100.00%      
TARP Preferred stock, redemption date           Aug. 31, 2016  
ColoEast Bankshares, Inc. | Preferred Stock              
Business Acquisition [Line Items]              
Preferred stock issued       $ 10,500,000     $ 10,500,000
ColoEast Bankshares, Inc. | Banking              
Business Acquisition [Line Items]              
Goodwill       $ 12,272,000