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Securities (Amortized Cost, Estimated Fair Value, and Gross Unrealized Gains and Losses of AFS and HTM Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Sep. 30, 2011
Investment [Line Items]    
Available-for-sale Securities, Amortized Cost $ 1,528,191 $ 1,443,529
Available-for-sale Securities, Gross Unrealized Gains 43,195 43,886
Available-for-sale Securities, Gross Unrealized Losses 656 976
Available-for-sale Securities, Estimated Fair Value 1,570,730 1,486,439
Held-to-maturity Securities, Amortized Cost 2,129,417 2,370,117
Held-to-maturity Securities, Unrealized Holding Gain 64,720 64,432
Held-to-maturity Securities, Unrealized Holding Loss 193 157
Held-to-maturity securities, Estimated Fair Value 2,193,944 2,434,392
Marketable Securities Amortized Cost 3,657,608 3,813,646
Marketable Securities Unrealized Gain 107,915 108,318
Marketable Securities Unrealized Loss 849 1,133
Marketable Securities, Estimated fair Value 3,764,674 3,920,831
GSE Debentures [Member]
   
Investment [Line Items]    
Available-for-sale Securities, Amortized Cost 879,175 746,545
Available-for-sale Securities, Gross Unrealized Gains 3,264 1,996
Available-for-sale Securities, Gross Unrealized Losses 111 233
Available-for-sale Securities, Estimated Fair Value 882,328 748,308
Held-to-maturity Securities, Amortized Cost 349,922 633,483
Held-to-maturity Securities, Unrealized Holding Gain 1,498 3,171
Held-to-maturity securities, Estimated Fair Value 351,420 636,654
Municipal Bonds [Member]
   
Investment [Line Items]    
Available-for-sale Securities, Amortized Cost 2,450 2,628
Available-for-sale Securities, Gross Unrealized Gains 117 126
Available-for-sale Securities, Estimated Fair Value 2,567 2,754
Held-to-maturity Securities, Amortized Cost 56,643 56,994
Held-to-maturity Securities, Unrealized Holding Gain 2,130 2,190
Held-to-maturity Securities, Unrealized Holding Loss   4
Held-to-maturity securities, Estimated Fair Value 58,773 59,180
Trust Preferred Securities [Member]
   
Investment [Line Items]    
Available-for-sale Securities, Amortized Cost 3,547 3,681
Available-for-sale Securities, Gross Unrealized Losses 545 740
Available-for-sale Securities, Estimated Fair Value 3,002 2,941
MBS [Member]
   
Investment [Line Items]    
Available-for-sale Securities, Amortized Cost 643,019 690,675
Available-for-sale Securities, Gross Unrealized Gains 39,814 41,764
Available-for-sale Securities, Gross Unrealized Losses   3
Available-for-sale Securities, Estimated Fair Value 682,833 732,436
Held-to-maturity Securities, Amortized Cost 1,722,852 1,679,640
Held-to-maturity Securities, Unrealized Holding Gain 61,092 59,071
Held-to-maturity Securities, Unrealized Holding Loss 193 153
Held-to-maturity securities, Estimated Fair Value $ 1,783,751 $ 1,738,558