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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Amortized Cost, Available-for-sale securities      
Amortized Cost $ 1,909,184,000 $ 2,365,450,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains 25,422,000 28,158,000  
Gross unrealized loss (11,712,000) (13,045,000)  
Fair Value, Available-for-sale securities      
Available-for-sale securities, at fair value $ 1,922,894,000 $ 2,380,563,000  
Yield, Available-for-sale securities      
Yield 2.22% 1.97%  
Amortized Cost, Held-to-maturity securities      
Amortized Cost $ 1,417,599,000 $ 1,643,216,000  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains 24,171,000 10,516,000  
Gross unrealized losses (214,000) (16,312,000)  
Fair Value, Held-to-maturity securities      
Fair Value 1,441,556,000 1,637,420,000  
Yield, Held-to-maturity securities      
Investments 3,326,783,000 4,008,666,000  
Gross unrealized gains on investments 49,593,000 38,674,000  
Gross unrealized losses on investments (11,926,000) (29,357,000)  
Fair value of investments $ 3,364,450,000 $ 4,017,983,000  
Yield on investments 2.62% 2.46%  
Available-for-sale securities purchased $ (137,591,000) $ (315,114,000) $ (1,280,477,000)
Payments to acquire held-to-maturity securities 0 259,489,000 0
Proceeds from sales of available-for-sale investment securities 50,741,000 246,826,000 $ 0
Proceeds from sale of held-to-maturity securities $ 0    
Term of contractual due dates (in years) 25 years    
U.S. government and agency securities      
Amortized Cost, Available-for-sale securities      
Within 1 year $ 21,284,000    
1 to 5 years 12,477,000 105,065,000  
5 to 10 years 48,134,000 119,071,000  
Over 10 years 182,051,000 262,832,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 0    
Gross unrealized gains, 1 to 5 years 1,027,000 1,923,000  
Gross unrealized gains, 5 to 10 years 0 35,000  
Gross unrealized gains, over 10 years 27,000 0  
Gross unrealized losses, within 1 year (59,000)    
Gross unrealized losses, 1 to 5 years (11,000) (274,000)  
Gross unrealized losses, 5 to 10 years (1,589,000) (1,247,000)  
Gross unrealized losses, over 10 years (3,990,000) (4,941,000)  
Fair Value, Available-for-sale securities      
Within 1 year 21,225,000    
1 to 5 years 13,493,000 106,714,000  
5 to 10 years 46,545,000 117,859,000  
Over 10 years $ 178,088,000 $ 257,891,000  
Yield, Available-for-sale securities      
Within 1 year 0.81%    
1 to 5 years 7.94% 1.74%  
5 to 10 years 1.14% 1.54%  
Over 10 years 1.33% 1.23%  
Equity Securities      
Amortized Cost, Available-for-sale securities      
Within 1 year $ 0 $ 500,000  
1 to 5 years 100,422,000 99,922,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 0 17,000  
Gross unrealized gains, 1 to 5 years 1,402,000 1,513,000  
Gross unrealized losses, within 1 year 0 0  
Gross unrealized losses, 1 to 5 years 0 0  
Fair Value, Available-for-sale securities      
Within 1 year 0 517,000  
1 to 5 years $ 101,824,000 $ 101,435,000  
Yield, Available-for-sale securities      
Within 1 year 0.00% 1.80%  
1 to 5 years 1.90% 1.90%  
Corporate debt securities      
Amortized Cost, Available-for-sale securities      
Within 1 year $ 278,094,000 $ 24,787,000  
1 to 5 years 63,481,000 311,435,000  
5 to 10 years 69,955,000 100,000,000  
Over 10 years 50,000,000 69,950,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 325,000 191,000  
Gross unrealized gains, 1 to 5 years 928,000 1,190,000  
Gross unrealized gains, 5 to 10 years 0 876,000  
Gross unrealized gains, over 10 years 938,000 953,000  
Gross unrealized losses, within 1 year (53,000) 0  
Gross unrealized losses, 1 to 5 years (113,000) (58,000)  
Gross unrealized losses, 5 to 10 years (2,417,000) (3,524,000)  
Gross unrealized losses, over 10 years 0 0  
Fair Value, Available-for-sale securities      
Within 1 year 278,366,000 24,978,000  
1 to 5 years 64,296,000 312,567,000  
5 to 10 years 67,538,000 97,352,000  
Over 10 years $ 50,938,000 $ 70,903,000  
Yield, Available-for-sale securities      
Within 1 year 1.33% 0.53%  
1 to 5 years 2.47% 0.88%  
5 to 10 years 1.96% 1.47%  
Over 10 years 3.00% 3.00%  
Municipal bonds      
Amortized Cost, Available-for-sale securities      
1 to 5 years $ 2,315,000 $ 2,285,000  
5 to 10 years 1,335,000 1,303,000  
Over 10 years 20,363,000 20,382,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 2,000 8,000  
Gross unrealized gains, 5 to 10 years 38,000 7,000  
Gross unrealized gains, over 10 years 3,617,000 3,138,000  
Gross unrealized losses, 1 to 5 years 0 0  
Gross unrealized losses, 5 to 10 years 0 0  
Gross unrealized losses, over 10 years 0 0  
Fair Value, Available-for-sale securities      
1 to 5 years 2,317,000 2,293,000  
5 to 10 years 1,373,000 1,310,000  
Over 10 years $ 23,980,000 $ 23,520,000  
Yield, Available-for-sale securities      
1 to 5 years 1.23% 1.23%  
5 to 10 years 2.05% 2.05%  
Over 10 years 6.45% 6.45%  
Agency pass through mortgage-backed securities      
Amortized Cost, Available-for-sale securities      
Without single maturity date $ 978,955,000 $ 1,144,787,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 17,118,000 18,222,000  
Gross unrealized losses, without single maturity date (3,032,000) (2,491,000)  
Fair Value, Available-for-sale securities      
Without single maturity date $ 993,041,000 $ 1,160,518,000  
Yield, Available-for-sale securities      
Without single maturity date 2.58% 2.48%  
Amortized Cost, Held-to-maturity securities      
Without single maturity date $ 1,417,599,000 $ 1,643,216,000  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, without single maturity date 24,171,000 10,516,000  
Gross unrealized losses, without single maturity date (214,000) (16,312,000)  
Fair Value, Held-to-maturity securities      
Without single maturity date $ 1,441,556,000 $ 1,637,420,000  
Yield, Held-to-maturity securities      
Without a single maturity date 3.18% 3.19%  
Commercial MBS      
Amortized Cost, Available-for-sale securities      
Without single maturity date $ 80,318,000 $ 103,131,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 0 85,000  
Gross unrealized losses, without single maturity date (448,000) (510,000)  
Fair Value, Available-for-sale securities      
Without single maturity date $ 79,870,000 $ 102,706,000  
Yield, Available-for-sale securities      
Without single maturity date 1.91% 1.51%