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Allowance for Losses on Loans - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
charge-off
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Provision for (reversal of) loan losses $ (1,932,000) $ (3,000,000) $ (11,381,000) $ (11,936,000)        
Number of charge-offs experienced | charge-off   2            
Reversal in allowance       2,399,000        
Adjustments, net         $ 2,910,000      
Allowance 2,366,000   2,366,000          
Loans receivable, gross 9,256,701,000   9,256,701,000   8,669,717,000      
Nonaccrual of interest 65,308,000   65,308,000   87,431,000      
Acquired loans subject to general allowance 33,573,000   33,573,000          
Charge-offs, net of (recoveries) 313,000 $ (2,219,000)            
Allowance for probable losses 105,611,000 $ 114,150,000 105,611,000 114,150,000 112,347,000 $ 108,323,000 $ 114,931,000 $ 116,741,000
Unfunded Loan Commitment [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Provision for (reversal of) loan losses       $ 467,000        
Loans Collectively Evaluated for Impairment [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 8,478,557,000   8,478,557,000   8,316,874,000      
Allowance for probable losses 105,611,000   105,611,000   112,287,000      
Loans Individually Evaluated for Impairment [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 88,008,000   88,008,000   134,736,000      
Allowance for probable losses 0   0   60,000      
Nonperforming Financing Receivable [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross $ 128,883,000   $ 128,883,000   $ 147,311,000      
Total grade as a % of total net loans 0.90%   0.90%   1.00%      
Nonaccrual of interest $ 65,308,000   $ 65,308,000   $ 87,431,000