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Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Amortized Cost, Available-for-sale securities    
Amortized Cost $ 2,300,034 $ 2,365,450
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 19,990 28,158
Gross unrealized loss (15,236) (13,045)
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 2,304,788 $ 2,380,563
Yield, Available-for-sale securities    
Yield 2.07% 1.97%
Yield, Held-to-maturity securities    
Investments $ 3,898,404 $ 4,008,666
Gross unrealized gains on investments 25,628 38,674
Gross unrealized losses on investments (47,955) (29,357)
Total financial assets $ 3,876,077 $ 4,017,983
Yield on investments 2.53% 2.46%
Obligations of U.S. government    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 99,907 $ 105,065
5 to 10 years 76,604 119,071
Over 10 years 254,886 262,832
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 1,600 1,923
Gross unrealized gains, 5 to 10 years 0 35
Gross unrealized gains, Over 10 years 100 0
Gross unrealized losses, 1 to 5 years (593) (274)
Gross unrealized losses, 5 to 10 years (1,852) (1,247)
Gross unrealized losses, Over 10 years (4,838) (4,941)
Fair Value, Available-for-sale securities    
1 to 5 years 100,914 106,714
5 to 10 years 74,752 117,859
Over 10 years $ 250,148 $ 257,891
Yield, Available-for-sale securities    
1 to 5 years 1.89% 1.74%
5 to 10 years 1.35% 1.54%
Over 10 years 1.34% 1.23%
Equity securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 500 $ 500
1 to 5 years 99,922 99,922
5 to 10 years 0  
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 11 17
Gross unrealized gains, 1 to 5 years 1,124 1,513
Gross unrealized gains, 5 to 10 years 0  
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years 0  
Fair Value, Available-for-sale securities    
Within 1 year 511 517
1 to 5 years 101,046 $ 101,435
5 to 10 years $ 0  
Yield, Available-for-sale securities    
Within 1 year 1.80% 1.80%
1 to 5 years 1.90% 1.90%
5 to 10 years 0.00%  
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 24,872 $ 24,787
1 to 5 years 341,470 311,435
5 to 10 years 89,952 100,000
Over 10 years 50,000 69,950
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 103 191
Gross unrealized gains, 1 to 5 years 839 1,190
Gross unrealized gains, 5 to 10 years 558 876
Gross unrealized gains, Over 10 years 750 953
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years (108) (58)
Gross unrealized losses, 5 to 10 years (3,030) (3,524)
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 24,975 24,978
1 to 5 years 342,201 312,567
5 to 10 years 87,480 97,352
Over 10 years $ 50,750 $ 70,903
Yield, Available-for-sale securities    
Within 1 year 0.57% 0.53%
1 to 5 years 1.20% 0.88%
5 to 10 years 1.80% 1.47%
Over 10 years 3.00% 3.00%
Municipal bonds due    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 2,292 $ 2,285
5 to 10 years 1,311 1,303
Over 10 years 20,377 20,382
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 3 8
Gross unrealized gains, 5 to 10 years 18 7
Gross unrealized gains, Over 10 years 3,230 3,138
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 2,295 2,293
5 to 10 years 1,329 1,310
Over 10 years $ 23,607 $ 23,520
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 certificates    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 1,141,558 $ 1,144,787
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 11,636 18,222
Gross unrealized losses, Without single maturity date (4,105) (2,491)
Fair Value, Available-for-sale securities    
Without single maturity date $ 1,149,089 $ 1,160,518
Yield, Available-for-sale securities    
Without single maturity date 2.56% 2.48%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 1,598,370 $ 1,643,216
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, Without single maturity date 5,638 10,516
Gross unrealized losses, Without single maturity date (32,719) (16,312)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 1,571,289 $ 1,637,420
Yield, Held-to-maturity securities    
Without a single maturity date 3.19% 3.19%
Other Commercial MBS    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 96,383 $ 103,131
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 18 85
Gross unrealized losses, Without single maturity date (710) (510)
Fair Value, Available-for-sale securities    
Without single maturity date $ 95,691 $ 102,706
Yield, Available-for-sale securities    
Without single maturity date 1.58% 1.51%