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Business Combinations and Divestitures - Summary of Acquired Loans (Details) - USD ($)
$ in Thousands
Dec. 09, 2017
Oct. 06, 2017
Valley Bancorp, Inc.    
Business Acquisition [Line Items]    
Total Loans $ 171,199  
Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 169,746  
Valley Bancorp, Inc. | PCI Loans    
Business Acquisition [Line Items]    
Acquired loans at acquisition 1,453  
Valley Bancorp, Inc. | Commercial real estate    
Business Acquisition [Line Items]    
Total Loans 73,527  
Valley Bancorp, Inc. | Commercial real estate | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 73,273  
Valley Bancorp, Inc. | Commercial real estate | PCI Loans    
Business Acquisition [Line Items]    
Acquired loans at acquisition 254  
Valley Bancorp, Inc. | Construction, land development, land    
Business Acquisition [Line Items]    
Total Loans 20,969  
Valley Bancorp, Inc. | Construction, land development, land | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 19,770  
Valley Bancorp, Inc. | Construction, land development, land | PCI Loans    
Business Acquisition [Line Items]    
Acquired loans at acquisition 1,199  
Valley Bancorp, Inc. | 1-4 family residential properties    
Business Acquisition [Line Items]    
Total Loans 26,264  
Valley Bancorp, Inc. | 1-4 family residential properties | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 26,264  
Valley Bancorp, Inc. | Farmland    
Business Acquisition [Line Items]    
Total Loans 16,934  
Valley Bancorp, Inc. | Farmland | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 16,934  
Valley Bancorp, Inc. | Commercial    
Business Acquisition [Line Items]    
Total Loans 31,893  
Valley Bancorp, Inc. | Commercial | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans 31,893  
Valley Bancorp, Inc. | Consumer    
Business Acquisition [Line Items]    
Total Loans 1,612  
Valley Bancorp, Inc. | Consumer | Non-Purchase Credit Impaired Loans    
Business Acquisition [Line Items]    
Loans, Excluding PCI Loans $ 1,612  
Independent Bank - Colorado Branches    
Business Acquisition [Line Items]    
Total Loans   $ 95,794
Independent Bank - Colorado Branches | Commercial real estate    
Business Acquisition [Line Items]    
Total Loans   13,382
Independent Bank - Colorado Branches | Construction, land development, land    
Business Acquisition [Line Items]    
Total Loans   537
Independent Bank - Colorado Branches | 1-4 family residential properties    
Business Acquisition [Line Items]    
Total Loans   6,986
Independent Bank - Colorado Branches | Farmland    
Business Acquisition [Line Items]    
Total Loans   31,490
Independent Bank - Colorado Branches | Commercial    
Business Acquisition [Line Items]    
Total Loans   43,104
Independent Bank - Colorado Branches | Consumer    
Business Acquisition [Line Items]    
Total Loans   $ 295