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Allowance for Losses on Loans - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Provision (reversal) for loan losses $ 219,000 $ (1,932,000) $ (3,949,000) $ (5,500,000) $ (3,465,000) $ (3,000,000) $ (4,336,000) $ (4,600,000) $ (11,162,000) $ (15,401,000) $ 1,350,000
Loans receivable, gross 9,823,270,000       8,882,920,000       9,823,270,000 8,882,920,000  
Covered loans, allowance for losses 0       2,244,000       0 2,244,000  
Nonaccrual loans by portfolio segment 67,810,000       87,431,000       67,810,000 87,431,000  
Allowance for credit losses, charge-offs, net of recoveries                 (5,370,000) (14,365,000)  
Allowance for probable losses 106,829,000       114,591,000       106,829,000 114,591,000 $ 116,741,000
Loans Collectively Evaluated for Impairment                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross 8,963,453,000 [1]       8,316,874,000 [2]       8,963,453,000 [1] 8,316,874,000 [2]  
Allowance for probable losses 106,554,000       112,287,000       106,554,000 112,287,000  
Loans Individually Evaluated for Impairment                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross 85,513,000 [1]       134,736,000 [2]       85,513,000 [1] 134,736,000 [2]  
Allowance for probable losses 275,000       60,000       275,000 60,000  
Covered Loans                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for probable losses         2,244,000         2,244,000  
Non-Performing Loans                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross $ 128,577,000       $ 147,311,000       $ 128,577,000 $ 147,311,000  
Ratio of non-performing assets to total assets 0.88%       1.00%       0.88% 1.00%  
Acquired loans subject to general allowance $ 30,778,000               $ 30,778,000    
Nonaccrual loans by portfolio segment $ 67,810,000       $ 87,431,000       $ 67,810,000 $ 87,431,000  
[1] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans
[2] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans