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Business Combinations and Divestitures - Additional Information (Details)
 3 Months Ended
Jun. 02, 2018
USD ($)
Apr. 09, 2018
USD ($)
Jan. 19, 2018
Dec. 09, 2017
USD ($)
locations
Oct. 06, 2017
USD ($)
Branch
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]                
Goodwill             $ 86,668,000 $ 44,126,000
Total assets             3,794,631,000 3,499,033,000
Valley Bank & Trust                
Business Acquisition [Line Items]                
Number of locations | locations       7        
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 1,534,000  
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%    
Interstate Capital Corporation                
Business Acquisition [Line Items]                
Date of acquisition completion date Jun. 02, 2018              
Goodwill $ 42,975,000              
Fair value of consideration paid included contingent consideration 20,000,000              
Business acquisition, related costs             1,094,000  
Aggregarte cash consideration paid for business acquisition 160,258,000              
Other liabilities 763,000              
Interstate Capital Corporation | Factoring                
Business Acquisition [Line Items]                
Goodwill 42,975,000              
Fair value of consideration paid included contingent consideration 20,000,000              
Interstate Capital Corporation | Factoring | Minimum                
Business Acquisition [Line Items]                
Fair value of consideration paid included contingent consideration 0              
Interstate Capital Corporation | Factoring | Maximum                
Business Acquisition [Line Items]                
Fair value of consideration paid included contingent consideration 22,000,000              
Interstate Capital Corporation | Factoring | Customer Relationship                
Business Acquisition [Line Items]                
Finite-lived intangible assets, fair value $ 13,500,000              
Finite lived intangible assets, Amortization period 8 years              
Interstate Capital Corporation | Factoring | Trade Name                
Business Acquisition [Line Items]                
Finite-lived intangible assets, fair value $ 420,000              
Finite lived intangible assets, Amortization period 3 years              
First Bancorp of Durango, Inc. And Southern Colorado Corp.                
Business Acquisition [Line Items]                
Date of acquisition, agreement date   Apr. 09, 2018            
Aggregarte cash consideration paid for business acquisition   $ 147,500,000            
First Bancorp of Durango, Inc                
Business Acquisition [Line Items]                
Total assets               646,000,000
Loans               271,000,000
Deposits               574,000,000
Southern Colorado Corp                
Business Acquisition [Line Items]                
Total assets               88,000,000
Loans               37,000,000
Deposits               79,000,000
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
Other liabilities       2,881,000        
Valley Bancorp, Inc. | Measurement Period Adjustments                
Business Acquisition [Line Items]                
Other liabilities             $ (1,700,000)  
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
Other liabilities         $ 249,000      
Number of branches acquired | Branch         9      
Aggregate deposit premium         $ 6,771,000      
Aggregate deposit premium, percentage         4.20%