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Allowance for Losses on Loans - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Provision (release) for loan losses $ (3,100,000) $ (1,650,000) $ (1,500,000) $ 0 $ 219,000 $ (1,932,000) $ (3,949,000) $ (5,500,000) $ (6,250,000) $ (11,162,000) $ (15,401,000)
Allowance for credit losses, charge-offs, net of recoveries                 (13,065,000) (5,370,000)  
Nonaccrual loans by portfolio segment 42,414,000       67,810,000       42,414,000 67,810,000  
Loans receivable, gross 10,950,608,000       9,823,270,000       10,950,608,000 9,823,270,000  
Covered loans, allowance for losses 0       0       0 0  
Allowance for probable losses 113,494,000       106,829,000       113,494,000 106,829,000 $ 114,591,000
Loans Collectively Evaluated for Impairment                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross 9,784,140,000 [1]       8,963,453,000 [2]       9,784,140,000 [1] 8,963,453,000 [2]  
Allowance for probable losses 113,128,000       106,554,000       113,128,000 106,554,000  
Loans Individually Evaluated for Impairment                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross 34,271,000 [1]       85,513,000 [2]       34,271,000 [1] 85,513,000 [2]  
Allowance for probable losses 366,000       275,000       366,000 275,000  
Covered Loans                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Loans receivable, gross 28,974,000       75,909,000       28,974,000 75,909,000  
Non-Performing Loans                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Nonaccrual loans by portfolio segment 42,414,000       67,810,000       42,414,000 67,810,000  
Loans receivable, gross $ 71,441,000       $ 128,908,000       $ 71,441,000 $ 128,908,000  
Ratio of non-performing assets to total assets 0.48%       0.88%       0.48% 0.88%  
Acquired loans subject to general allowance $ 20,175,000               $ 20,175,000    
[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