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Investment Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2016
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 8,429,964 $ 8,261,539
Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 2,773,111 2,998,335
Unamortized Premium/(Discount) 5,936 5,898
Available-for-sale Securities, Amortized Cost Basis 2,779,047 3,004,233
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 6,891 6,871
Available-for-sale Securities, Unrealized Losses (10,913) (9,919)
Available-for-sale Securities, Fair Value Disclosure 2,775,025 3,001,185
Trading Securities [Abstract]    
Trading, at fair value 491 0
Marketable Securities [Abstract]    
Marketable Securities Unpaid Principal Balance 2,775,322 2,998,335
Marketable Securities, Amortized Cost 2,781,258 3,004,233
Marketable Securities, Unrealized Gains 6,891 6,871
Marketable Securities, Unrealized Losses (12,633) (9,919)
Marketable Securities 2,775,516 3,001,185
USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1,888,344 1,980,327
Trading Securities [Abstract]    
Trading, at fair value 28,975 23,489
Marketable Securities [Abstract]    
Marketable Securities 1,917,319 2,003,816
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 5,936 5,898
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 46,500 19,700
Available-for-sale Securities, Amortized Cost Basis 46,500 19,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (1,576) (2,118)
Available-for-sale Securities, Fair Value Disclosure 44,924 17,582
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 74,744 52,406
Available-for-sale Securities, Amortized Cost Basis 74,491 52,192
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 14 2
Available-for-sale Securities, Unrealized Losses (776) (540)
Available-for-sale Securities, Fair Value Disclosure 73,729 51,654
Trading Securities [Abstract]    
Trading Securities - Amount Outstanding 2,211  
Trading Securities, Debt, Amortized Cost 2,211 0
Trading Securities, Unrealized Gains 0  
Trading Securities, Unrealized Losses (1,720)  
Trading, at fair value 491 0
Floating Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 10,000 15,000
Available-for-sale Securities, Amortized Cost Basis 10,000 15,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 19
Available-for-sale Securities, Unrealized Losses (9) 0
Available-for-sale Securities, Fair Value Disclosure 9,991 15,019
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 1,353,495 1,299,576
Available-for-sale Securities, Amortized Cost Basis 1,357,010 1,302,487
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,768 1,798
Available-for-sale Securities, Unrealized Losses (4,319) (3,594)
Available-for-sale Securities, Fair Value Disclosure 1,355,459 1,300,691
Floating Interest Rate [Member] | GSE Subordinated Debt [Member}    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 70,000 70,000
Available-for-sale Securities, Amortized Cost Basis 70,000 70,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (3,751) (3,596)
Available-for-sale Securities, Fair Value Disclosure 66,249 66,404
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (253) (214)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 3,515 2,911
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | GSE Subordinated Debt [Member}    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Trading Securities [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0  
Fixed Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 10,000  
Available-for-sale Securities, Amortized Cost Basis 9,999  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0  
Available-for-sale Securities, Unrealized Losses (5)  
Available-for-sale Securities, Fair Value Disclosure 9,994  
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 692 [1] 582
Available-for-sale Securities, Amortized Cost Basis 3,809 [1] 3,276
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,095 [1] 4,430
Available-for-sale Securities, Unrealized Losses 0 [1] 0
Available-for-sale Securities, Fair Value Disclosure 7,904 [1] 7,706 [2]
Derivative, Notional Amount 148,500 146,700
Fixed Interest Rate [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 214,000 362,295
Available-for-sale Securities, Amortized Cost Basis 213,975 362,449
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 12 98
Available-for-sale Securities, Unrealized Losses 0 (24)
Available-for-sale Securities, Fair Value Disclosure 213,987 362,523
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 993,680 1,178,776
Available-for-sale Securities, Amortized Cost Basis 993,263 1,179,129
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2 524
Available-for-sale Securities, Unrealized Losses (477) (47)
Available-for-sale Securities, Fair Value Disclosure 992,788 1,179,606
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (1)  
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 3,117 [1] 2,694
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (25) 154
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (417) 353
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) $ 7,200 $ 7,100
[1] Fair value includes $7.2 million of an interest-only security with a notional amount of $148.5 million.
[2] Fair value includes $7.1 million of an interest-only security with a notional amount of $146.7 million. As of December 31, 2015 Amount Outstanding Unamortized Premium/(Discount) AmortizedCost UnrealizedGains UnrealizedLosses Fair Value (in thousands)Available-for-sale: Floating rate auction-rate certificates backed by Government guaranteed student loans$46,500 $— $46,500 $— $(1,576) $44,924Floating rate asset-backed securities74,744 (253) 74,491 14 (776) 73,729Floating rate corporate debt securities10,000 — 10,000 — (9) 9,991Fixed rate corporate debt securities10,000 (1) 9,999 — (5) 9,994Floating rate Government/GSE guaranteed mortgage-backed securities1,353,495 3,515 1,357,010 2,768 (4,319) 1,355,459Fixed rate GSE guaranteed mortgage-backed securities(1)692 3,117 3,809 4,095 — 7,904Floating rate GSE subordinated debt70,000 — 70,000 — (3,751) 66,249Fixed rate senior agency debt214,000 (25) 213,975 12 — 213,987Fixed rate U.S. Treasuries993,680 (417) 993,263 2 (477) 992,788Total available-for-sale2,773,111 5,936 2,779,047 6,891 (10,913) 2,775,025Trading: Floating rate asset-backed securities2,211 — 2,211 — (1,720) 491Total investment securities$2,775,322 $5,936 $2,781,258 $6,891 $(12,633) $2,775,516