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AFS, Debt Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost $ 471,485 $ 1,719,843
Available-for-sale, gross unrealized losses (99) (474)
Available-for-sale, estimated fair value 471,833 1,734,380
Due in one year or less [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 41,078 224,531
Available-for-sale, gross unrealized gains 5 512
Available-for-sale, gross unrealized losses (5) (34)
Available-for-sale, estimated fair value 41,078 225,009
Due after one year and through five years [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 428,212 1,395,685
Available-for-sale, gross unrealized gains 434 2,648
Available-for-sale, gross unrealized losses (94) (330)
Available-for-sale, estimated fair value 428,552 1,398,003
Due after five years and through ten years [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 0 82,250
Available-for-sale, gross unrealized gains 0 47
Available-for-sale, gross unrealized losses 0 (110)
Available-for-sale, estimated fair value 0 82,187
Due after ten years [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 0 9,825
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 0 9,825
Total Maturities Member    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 469,290 1,712,291
Available-for-sale, gross unrealized gains 439 3,207
Available-for-sale, gross unrealized losses (99) (474)
Available-for-sale, estimated fair value 469,630 1,715,024
Equity Securities [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 2,195 1,362
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 2,203 13,166
Corporate Bond Securities [Member]    
Schedule of available-for-sale securities, debt maturities [Line Items]    
Available-for-sale, adjusted cost 1,000 924,818
Available-for-sale, gross unrealized losses 0 (265)
Available-for-sale, estimated fair value $ 1,000 $ 926,929