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Business Combinations and Divestitures - Additional Information (Details)
 12 Months Ended
Sep. 08, 2018
USD ($)
Branch
Jun. 02, 2018
USD ($)
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 ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                      
Goodwill                 $ 158,743,000 $ 44,126,000  
Triumph Healthcare Finance                      
Business Acquisition [Line Items]                      
Disposal of group agreement date     Jan. 19, 2018                
Disposal of group closing date     Mar. 16, 2018                
Triumph Capital Advisors, LLC                      
Business Acquisition [Line Items]                      
Business acquisition, related costs           $ 400,000          
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     1,774,000    
Cash proceeds from the revenue share                 $ 174,000    
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          
Triumph Capital Advisors, LLC | Interest Rate Floor | Loans Receivable                      
Business Acquisition [Line Items]                      
Term credit facility, interest rate           5.50%          
Minimum                      
Business Acquisition [Line Items]                      
Finite lived intangible assets, Amortization period                 8 years    
Maximum                      
Business Acquisition [Line Items]                      
Finite lived intangible assets, Amortization period                 10 years    
First National Bank of Durango | Durango, Colorado                      
Business Acquisition [Line Items]                      
Number of branches acquired | Branch 4                    
First National Bank of Durango | Bayfield, Colorado                      
Business Acquisition [Line Items]                      
Number of branches acquired | Branch 1                    
Bank of New Mexico | Albuquerque, Gallup and Grants, New Mexico                      
Business Acquisition [Line Items]                      
Number of branches acquired | Branch 3                    
Citizens Bank of Pagosa Springs | Pagosa Springs, Colorado                      
Business Acquisition [Line Items]                      
Number of branches acquired | Branch 2                    
First Bancorp of Durango, Inc. And Southern Colorado Corp.                      
Business Acquisition [Line Items]                      
Goodwill $ 72,075,000                    
Finite lived intangible assets, Amortization period 10 years                    
Business acquisition, related costs                 $ 5,871,000,000    
Cash paid for business acquisition $ 147,961,000                    
Intangible asset 14,069,000                    
First Bancorp of Durango, Inc. And Southern Colorado Corp. | PCI Loans                      
Business Acquisition [Line Items]                      
Acquired loans at acquisition $ 5,208,000                    
Interstate Capital Corporation                      
Business Acquisition [Line Items]                      
Goodwill   $ 42,975,000                  
Date of acquisition completion date   Jun. 02, 2018                  
Cash paid for business acquisition   $ 160,258,000                  
Intangible asset   13,920,000                  
Interstate Capital Corporation | Minimum                      
Business Acquisition [Line Items]                      
Fair value of consideration paid included contingent consideration   0                  
Interstate Capital Corporation | Maximum                      
Business Acquisition [Line Items]                      
Fair value of consideration paid included contingent consideration   22,000,000                  
Interstate Capital Corporation | Factoring                      
Business Acquisition [Line Items]                      
Goodwill   42,975,000                  
Fair value of consideration paid included contingent consideration   $ 20,000,000             $ 20,745,000    
Interstate Capital Corporation | Factoring | Customer Relationship                      
Business Acquisition [Line Items]                      
Finite lived intangible assets, Amortization period   8 years                  
Finite-lived intangible assets, fair value   $ 13,500,000                  
Interstate Capital Corporation | Factoring | Trade Name                      
Business Acquisition [Line Items]                      
Finite lived intangible assets, Amortization period   3 years                  
Finite-lived intangible assets, fair value   $ 420,000                  
Valley Bancorp, Inc.                      
Business Acquisition [Line Items]                      
Goodwill       $ 10,523,000              
Business acquisition, related costs                   1,251,000  
Date of acquisition completion date       Dec. 09, 2017              
Intangible asset       $ 6,072,000              
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              
Valley Bank & Trust                      
Business Acquisition [Line Items]                      
Number of locations | locations       7              
Independent Bank - Colorado Branches                      
Business Acquisition [Line Items]                      
Number of branches acquired | Branch         9            
Goodwill         $ 5,817,000            
Finite lived intangible assets, Amortization period         10 years            
Business acquisition, related costs                   $ 437,000  
Date of acquisition completion date         Oct. 06, 2017            
Aggregate deposit premium         $ 6,771,000            
Aggregate deposit premium, percentage         4.20%            
Intangible asset         $ 3,255,000            
Independent Bank - Colorado Branches | PCI Loans                      
Business Acquisition [Line Items]                      
Acquired loans at acquisition         0            
Independent Bank - Colorado Branches | Banking                      
Business Acquisition [Line Items]                      
Goodwill         $ 5,817,000            
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                     1,618,000,000
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
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