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Business Combinations and Divestitures - Schedule of Loans Acquired in Business Combination (Details) - USD ($)
Dec. 09, 2017
Oct. 06, 2017
Aug. 01, 2016
Valley Bancorp, Inc.      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Fair value at acquisition $ 171,199,000    
Valley Bancorp, Inc. | PCI Loans      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Contractually required principal and interest payments 2,599,000    
Contractual cash flows not expected to be collected (nonaccretable difference) 775,000    
Expected cash flows at acquisition 1,824,000    
Interest component of expected cash flows (accretable yield) 371,000    
Fair value at acquisition 1,453,000    
Valley Bancorp, Inc. | Non-PCI      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Contractually required principal and interest payments 214,139,000    
Contractual cash flows not expected to be collected 3,646,000    
Fair value at acquisition $ 169,746,000    
Independent Bank - Colorado Branches      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Fair value at acquisition   $ 95,794,000  
Independent Bank - Colorado Branches | PCI Loans      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Fair value at acquisition   0  
Independent Bank - Colorado Branches | Non-PCI      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Contractually required principal and interest payments   122,498,000  
Contractual cash flows not expected to be collected   3,415,000  
Fair value at acquisition   $ 95,794,000  
ColoEast Bankshares, Inc.      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Fair value at acquisition     $ 460,775,000
ColoEast Bankshares, Inc. | PCI Loans      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Contractually required principal and interest payments     25,124,000
Contractual cash flows not expected to be collected (nonaccretable difference)     1,707,000
Expected cash flows at acquisition     23,417,000
Interest component of expected cash flows (accretable yield)     4,124,000
Fair value at acquisition     19,293,000
ColoEast Bankshares, Inc. | Non-PCI      
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]      
Contractually required principal and interest payments     530,404,000
Contractual cash flows not expected to be collected     21,272,000
Fair value at acquisition     $ 441,482,000