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Business Combinations and Divestitures - Schedule of Loans Acquired in Business Combination (Details) - USD ($)
Sep. 08, 2018
Dec. 09, 2017
Oct. 06, 2017
Aug. 01, 2016
FBD | PCI Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments $ 10,511,000      
Contractual cash flows not expected to be collected (nonaccretable difference) 2,570,000      
Expected cash flows at acquisition 7,941,000      
Interest component of expected cash flows (accretable yield) 2,933,000      
Fair value of loans acquired with deterioration of credit quality 5,008,000      
FBD | Non-Purchase Credit Impaired Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments 318,674,000      
Contractual cash flows not expected to be collected 4,255,000      
Fair value at acquisition 251,376,000      
SCC | PCI Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments 269,000      
Contractual cash flows not expected to be collected (nonaccretable difference) 5,000      
Expected cash flows at acquisition 264,000      
Interest component of expected cash flows (accretable yield) 64,000      
Fair value of loans acquired with deterioration of credit quality 200,000      
SCC | Non-Purchase Credit Impaired Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments 38,590,000      
Contractual cash flows not expected to be collected 550,000      
Fair value at acquisition 31,254,000      
Total        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Fair value at acquisition 282,630,000      
Total | PCI Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments 10,780,000      
Contractual cash flows not expected to be collected (nonaccretable difference) 2,575,000      
Expected cash flows at acquisition 8,205,000      
Interest component of expected cash flows (accretable yield) 2,997,000      
Fair value of loans acquired with deterioration of credit quality 5,208,000      
Total | Non-Purchase Credit Impaired Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Contractually required principal and interest payments 357,264,000      
Contractual cash flows not expected to be collected 4,805,000      
Fair value at acquisition $ 282,630,000      
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 of loans acquired with deterioration of credit quality   1,453,000    
Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans        
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 | PCI Loans        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]        
Fair value of loans acquired with deterioration of credit quality     $ 0  
Independent Bank - Colorado Branches | Non-Purchase Credit Impaired Loans        
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. | 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 of loans acquired with deterioration of credit quality       19,293,000
ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans        
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