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Summary of Significant Accounting Policies - Business Combinations (Details)
$ in Thousands
Nov. 01, 2012
USD ($)
branch
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
branch
May. 03, 2014
branch
May. 02, 2014
branch
Dec. 07, 2013
branch
Dec. 06, 2013
branch
Nov. 01, 2013
branch
Oct. 31, 2013
branch
Sep. 30, 2013
USD ($)
Business Acquisition [Line Items]                    
Intangible assets, goodwill   $ 291,503 $ 291,503             $ 260,277
Bank of America, National Association                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch     74              
Deposit accounts     $ 1,900,000              
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 $ 736,000                  
Net loans 361,000                  
Net covered loans 108,000                  
Transaction deposit accounts 533,000                  
Consideration transferred 44,000                  
Consideration paid in stock 34,000                  
Cash resulting from the collection of certain earn-out assets $ 10,000                  
South Valley Bancorp, Inc. | Central and Southern Oregon                    
Business Acquisition [Line Items]                    
Number of branches acquired (in branches) | branch 24