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Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Amortized Cost, Available-for-sale securities    
Amortized Cost $ 1,273,080 $ 1,256,587
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 7,422 13,829
Gross unrealized loss 11,231 4,207
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 1,269,271 $ 1,266,209
Yield, Available-for-sale securities    
Yield 3.18% 2.86%
Amortized Cost, Held-to-maturity securities    
Held-to-maturity securities, at amortized cost $ 1,716,566 $ 1,646,856
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Held-to-maturity securities, Gross unrealized gains 1,112 7,143
Held-to-maturity securities ,Gross unrealized losses (49,891) (18,086)
Fair Value, Held-to-maturity securities    
Held-to-maturity securities, Fair Value $ 1,667,787 $ 1,635,913
Yield, Held-to-maturity securities    
Held-to-maturity securities, Yield 3.16% 3.14%
Investments $ 2,989,646 $ 2,903,443
Gross unrealized gains on investments 8,534 20,972
Gross unrealized losses on investments (61,122) (22,293)
Total financial assets $ 2,937,058 $ 2,902,122
Yield on investments 3.17% 3.02%
U.S. government and agency securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 3,300 $ 9,300
1 to 5 years   5,688
5 to 10 years 65,997 69,108
Over 10 years 116,463 127,936
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 3 146
Gross unrealized gains, 1 to 5 years   2
Gross unrealized gains, 5 to 10 years 0 0
Gross unrealized gains, Over 10 years 27 353
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years   0
Gross unrealized losses, 5 to 10 years (1,432) (1,238)
Gross unrealized losses, Over 10 years (419) (218)
Fair Value, Available-for-sale securities    
Within 1 year 3,303 9,446
1 to 5 years   5,690
5 to 10 years 64,565 67,870
Over 10 years $ 116,071 $ 128,071
Yield, Available-for-sale securities    
Within 1 year 9.80% 10.38%
1 to 5 years   1.51%
5 to 10 years 2.33% 1.93%
Over 10 years 2.46% 1.92%
Equity securities    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 500 $ 500
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 0 22
Gross unrealized losses, 1 to 5 years (5) 0
Fair Value, Available-for-sale securities    
1 to 5 years $ 495 $ 522
Yield, Available-for-sale securities    
1 to 5 years 1.80% 1.80%
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 63,692 $ 63,622
5 to 10 years 119,963 119,960
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 1,768 2,083
Gross unrealized gains, 5 to 10 years 78 210
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years (2,044) (577)
Fair Value, Available-for-sale securities    
1 to 5 years 65,460 65,705
5 to 10 years $ 117,997 $ 119,593
Yield, Available-for-sale securities    
1 to 5 years 3.63% 2.96%
5 to 10 years 2.93% 2.62%
Municipal bonds    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 2,359 $ 2,344
1 to 5 years 1,382 1,367
Over 10 years 20,333 20,343
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 0 10
Gross unrealized gains, 1 to 5 years 0 55
Gross unrealized gains, Over 10 years 2,134 2,505
Gross unrealized losses, Within 1 year (2) 0
Gross unrealized losses, 1 to 5 years (10) 0
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 2,357 2,354
1 to 5 years 1,372 1,422
Over 10 years $ 22,467 $ 22,848
Yield, Available-for-sale securities    
Within 1 year 1.23% 1.23%
1 to 5 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 $ 870,741 $ 828,069
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 3,400 8,402
Gross unrealized losses, Without single maturity date (7,319) (2,174)
Fair Value, Available-for-sale securities    
Without single maturity date $ 866,822 $ 834,297
Yield, Available-for-sale securities    
Without single maturity date 3.24% 2.96%
Amortized Cost, Held-to-maturity securities    
Held-to-maturity securities, at amortized cost $ 1,701,566 $ 1,646,856
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Held-to-maturity securities, Gross unrealized gains 1,112 7,143
Held-to-maturity securities ,Gross unrealized losses (49,891) (18,086)
Fair Value, Held-to-maturity securities    
Held-to-maturity securities, Fair Value $ 1,652,787 $ 1,635,913
Yield, Held-to-maturity securities    
Held-to-maturity securities, Yield 3.16% 3.14%
Commercial MBS    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 8,350 $ 8,350
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 12 41
Gross unrealized losses, Without single maturity date 0 0
Fair Value, Available-for-sale securities    
Without single maturity date $ 8,362 $ 8,391
Yield, Available-for-sale securities    
Without single maturity date 3.85% 3.31%
Amortized Cost, Held-to-maturity securities    
Held-to-maturity securities, at amortized cost $ 15,000  
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Held-to-maturity securities, Gross unrealized gains 0  
Held-to-maturity securities ,Gross unrealized losses 0  
Fair Value, Held-to-maturity securities    
Held-to-maturity securities, Fair Value $ 15,000  
Yield, Held-to-maturity securities    
Held-to-maturity securities, Yield 2.66%