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Summary of Significant Accounting Policies - Business Combinations (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
branch
Sep. 30, 2014
USD ($)
May 03, 2014
branch
May 02, 2014
branch
Dec. 07, 2013
branch
Dec. 06, 2013
branch
Nov. 01, 2013
branch
Oct. 31, 2013
branch
Nov. 01, 2012
USD ($)
Business Acquisition [Line Items]                    
Intangible assets, goodwill $ 291,503 $ 291,503 $ 291,503              
Bank of America, National Association                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch   74                
Net loans   $ 13,000                
Branch properties   $ 25,000                
Premium on deposits   1.99%                
Cash and equivalents   $ 1,800,000                
Intangibles   11,000                
Intangible assets, goodwill   $ 31,000                
Bank of America, National Association | New Mexico                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch               11 11  
Bank of America, National Association | Washington, Oregon, and Idaho                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch           40 40      
Bank of America, National Association | Arizona and Nevada                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch       23 23          
South Valley Bancorp, Inc.                    
Business Acquisition [Line Items]                    
Deposit accounts                   $ 1,900,000