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Investment Securities - Investments by Contractual Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Amortized Cost, Available-for-sale securities      
Amortized Cost $ 3,016,432 $ 2,350,864  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains 37,273 19,686  
Gross unrealized loss (4,263) (9,602)  
Fair Value, Available-for-sale securities      
Fair Value 3,049,442 2,360,948  
Yield, Available-for-sale securities      
Yield 1.99% 1.70%  
Amortized Cost, Held-to-maturity securities      
Amortized Cost 1,548,265 1,654,666  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains 4,855 3,387  
Gross unrealized losses (53,902) (75,204)  
Fair Value, Held-to-maturity securities      
Fair Value 1,499,218 1,582,849  
Yield, Held-to-maturity securities      
Without a single maturity date 3.13%    
Yield   3.14%  
Investments 4,564,697 4,005,530  
Gross unrealized gains on investments 42,128 23,073  
Gross unrealized losses on investments (58,165) (84,806)  
Fair value of investments 4,548,660 3,943,797  
Yield on investments 2.38% 2.30%  
Proceeds from available-for-sale securities 0 43,198 2,257,913
Gain (loss) on sale of securities   0 95,234
Term of contractual due dates of substantially all mortgage-backed securities 25 years    
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,642,718 190,357  
Obligations of U.S. government
      
Amortized Cost, Available-for-sale securities      
1 to 5 years 171,154 61,002  
5 to 10 years 203,317 129,219  
Over 10 years 354,828 344,571  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 2,585 3,393  
Gross unrealized gains, 5 to 10 years 300 0  
Gross unrealized gains, over 10 years 1,028 0  
Gross unrealized losses, 1 to 5 years (748) (252)  
Gross unrealized losses, 5 to 10 years (102) (1,547)  
Gross unrealized losses, over 10 years (419) (2,411)  
Fair Value, Available-for-sale securities      
1 to 5 years 172,991 64,143  
5 to 10 years 203,515 127,672  
Over 10 years 355,437 342,160  
Yield, Available-for-sale securities      
1 to 5 years 1.26% 1.98%  
5 to 10 years 1.45% 0.86%  
Over 10 years 1.25% 0.93%  
Equity Securities
      
Amortized Cost, Available-for-sale securities      
1 to 5 years 100,500 500  
5 to 10 years 0 100,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 887 11  
Gross unrealized gains, 5 to 10 years 0 726  
Gross unrealized losses, 1 to 5 years 0 0  
Gross unrealized losses, 5 to 10 years 0 0  
Fair Value, Available-for-sale securities      
1 to 5 years 101,387 511  
5 to 10 years 0 100,726  
Yield, Available-for-sale securities      
1 to 5 years 1.90% 2.17%  
5 to 10 years 0.00% 1.80%  
Corporate debt securities
      
Amortized Cost, Available-for-sale securities      
Within 1 year 15,000 19,500  
1 to 5 years 302,540 317,190  
5 to 10 years 138,201 113,060  
Over 10 years 50,000    
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 75 3  
Gross unrealized gains, 1 to 5 years 2,372 1,980  
Gross unrealized gains, 5 to 10 years 1,789 1,180  
Gross unrealized gains, over 10 years 0    
Gross unrealized losses, within 1 year 0 0  
Gross unrealized losses, 1 to 5 years 0 (130)  
Gross unrealized losses, 5 to 10 years (970) (768)  
Gross unrealized losses, over 10 years 0    
Fair Value, Available-for-sale securities      
Within 1 year 15,075 19,503  
1 to 5 years 304,912 319,040  
5 to 10 years 139,020 113,472  
Over 10 years 50,000    
Yield, Available-for-sale securities      
Within 1 year 1.00% 0.49%  
1 to 5 years 0.71% 0.75%  
5 to 10 years 1.43% 1.53%  
Over 10 years 3.00%    
Yield, Held-to-maturity securities      
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 24,155 9,763  
Municipal Bonds
      
Amortized Cost, Available-for-sale securities      
Over 10 years 20,402 20,422  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, over 10 years 3,279 2,123  
Gross unrealized losses, over 10 years 0 0  
Fair Value, Available-for-sale securities      
Over 10 years 23,681 22,545  
Yield, Available-for-sale securities      
Over 10 years 6.45% 6.45%  
Agency pass through mortgage-backed securities
      
Amortized Cost, Available-for-sale securities      
Without single maturity date 1,561,639 1,245,400  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 24,893 10,270  
Gross unrealized losses, without single maturity date (2,024) (4,494)  
Fair Value, Available-for-sale securities      
Without single maturity date 1,584,508 1,251,176  
Yield, Available-for-sale securities      
Without single maturity date 2.57% 2.18%  
Amortized Cost, Held-to-maturity securities      
Without single maturity date 1,548,265 1,654,666  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, without single maturity date 4,855 3,387  
Gross unrealized losses, without single maturity date (53,902) (75,204)  
Fair Value, Held-to-maturity securities      
Without single maturity date 1,499,218 1,582,849  
Yield, Held-to-maturity securities      
Without a single maturity date 3.13% 3.14%  
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 1,509,209 166,503  
Commercial Mortgage Backed Securities [Member]
      
Amortized Cost, Available-for-sale securities      
Without single maturity date 98,851    
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 65    
Fair Value, Available-for-sale securities      
Without single maturity date $ 98,916    
Yield, Available-for-sale securities      
Without single maturity date 1.49%