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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Amortized Cost, Available-for-sale securities    
Amortized Cost $ 2,365,450 $ 3,016,432
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 28,158 37,273
Gross unrealized loss (13,045) (4,263)
Fair Value, Available-for-sale securities    
Available-for-sale securities $ 2,380,563 $ 3,049,442
Yield, Available-for-sale securities    
Yield 1.97% 1.99%
Amortized Cost, Held-to-maturity securities    
Amortized Cost $ 1,643,216 $ 1,548,265
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains 10,516 4,855
Gross unrealized losses (16,312) (53,902)
Fair Value, Held-to-maturity securities    
Fair Value $ 1,637,420 $ 1,499,218
Yield, Held-to-maturity securities    
Without a single maturity date 3.19%  
Yield   3.13%
Investments $ 4,008,666 $ 4,564,697
Gross unrealized gains on investments 38,674 42,128
Gross unrealized losses on investments (29,357) (58,165)
Fair value of investments $ 4,017,983 $ 4,548,660
Yield on investments 2.46% 2.38%
Proceeds from available-for-sale securities $ 246,826  
Gain (loss) on sale of securities $ 9,641  
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 $ 1,297,408 $ 1,642,718
Obligations of U.S. government    
Amortized Cost, Available-for-sale securities    
1 to 5 years 105,065 171,154
5 to 10 years 119,071 203,317
Over 10 years 262,832 354,828
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 1,923 2,585
Gross unrealized gains, 5 to 10 years 35 300
Gross unrealized gains, over 10 years 0 1,028
Gross unrealized losses, 1 to 5 years (274) (748)
Gross unrealized losses, 5 to 10 years (1,247) (102)
Gross unrealized losses, over 10 years (4,941) (419)
Fair Value, Available-for-sale securities    
1 to 5 years 106,714 172,991
5 to 10 years 117,859 203,515
Over 10 years $ 257,891 $ 355,437
Yield, Available-for-sale securities    
1 to 5 years 1.74% 1.26%
5 to 10 years 1.54% 1.45%
Over 10 years 1.23% 1.25%
Equity Securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 500  
1 to 5 years 99,922 $ 100,500
5 to 10 years 0 0
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 17  
Gross unrealized gains, 1 to 5 years 1,513 887
Gross unrealized gains, 5 to 10 years 0  
Gross unrealized losses, within 1 year 0  
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 517  
1 to 5 years 101,435 101,387
5 to 10 years $ 0 $ 0
Yield, Available-for-sale securities    
Within 1 year 1.80%  
1 to 5 years 1.90% 1.90%
5 to 10 years 0.00% 0.00%
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 24,787 $ 15,000
1 to 5 years 311,435 302,540
5 to 10 years 100,000 138,201
Over 10 years 69,950 50,000
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 191 75
Gross unrealized gains, 1 to 5 years 1,190 2,372
Gross unrealized gains, 5 to 10 years 876 1,789
Gross unrealized gains, over 10 years 953 0
Gross unrealized losses, within 1 year 0 0
Gross unrealized losses, 1 to 5 years (58) 0
Gross unrealized losses, 5 to 10 years (3,524) (970)
Gross unrealized losses, over 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 24,978 15,075
1 to 5 years 312,567 304,912
5 to 10 years 97,352 139,020
Over 10 years $ 70,903 $ 50,000
Yield, Available-for-sale securities    
Within 1 year 0.53% 1.00%
1 to 5 years 0.88% 0.71%
5 to 10 years 1.47% 1.43%
Over 10 years 3.00% 3.00%
Yield, Held-to-maturity securities    
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer $ 46,601 $ 24,155
Municipal Bonds    
Amortized Cost, Available-for-sale securities    
1 to 5 years 2,285 0
5 to 10 years 1,303 0
Over 10 years 20,382 20,402
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 8 0
Gross unrealized gains, 5 to 10 years 7 0
Gross unrealized gains, over 10 years 3,138 3,279
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 2,293 0
5 to 10 years 1,310 0
Over 10 years $ 23,520 $ 23,681
Yield, Available-for-sale securities    
1 to 5 years 1.23% 0.00%
5 to 10 years 2.05% 0.00%
Over 10 years 6.45% 6.45%
Agency pass through mortgage-backed securities    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 1,144,787 $ 1,561,639
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, without single maturity date 18,222 24,893
Gross unrealized losses, without single maturity date (2,491) (2,024)
Fair Value, Available-for-sale securities    
Without single maturity date $ 1,160,518 $ 1,584,508
Yield, Available-for-sale securities    
Without single maturity date 2.48% 2.57%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 1,643,216 $ 1,548,265
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, without single maturity date 10,516 4,855
Gross unrealized losses, without single maturity date (16,312) (53,902)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 1,637,420 $ 1,499,218
Yield, Held-to-maturity securities    
Without a single maturity date 3.19% 3.13%
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer $ 1,193,463 $ 1,509,209
Commercial Mortgage Backed Securities [Member]    
Amortized Cost, Available-for-sale securities    
Without single maturity date 103,131 98,851
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, without single maturity date 85 65
Gross unrealized losses, without single maturity date (510) 0
Fair Value, Available-for-sale securities    
Without single maturity date $ 102,706 $ 98,916
Yield, Available-for-sale securities    
Without single maturity date 1.51% 1.49%