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Investment Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2016
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 8,429,964 $ 8,100,257
Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 2,773,111 2,513,294
Unamortized Premium/(Discount) 5,936 5,672
Available-for-sale Securities, Amortized Cost Basis 2,779,047 2,518,966
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 6,891 6,362
Available-for-sale Securities, Unrealized Losses (10,913) (9,477)
Available-for-sale Securities, Fair Value Disclosure 2,775,025 2,515,851
Trading Securities [Abstract]    
Trading, at fair value 491 0
Marketable Securities [Abstract]    
Marketable Securities Unpaid Principal Balance 2,775,322 2,513,294
Marketable Securities, Amortized Cost 2,781,258 2,518,966
Marketable Securities, Unrealized Gains 6,891 6,362
Marketable Securities, Unrealized Losses (12,633) (9,477)
Marketable Securities 2,775,516 2,515,851
USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1,888,344 0
Trading Securities [Abstract]    
Trading, at fair value 28,975 20,388
Marketable Securities [Abstract]    
Marketable Securities 1,917,319 2,029,613
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 5,936 5,672
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) (1,970)
Available-for-sale Securities, Fair Value Disclosure 44,924 17,730
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 74,744 44,442
Available-for-sale Securities, Amortized Cost Basis 74,491 44,240
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 14 1
Available-for-sale Securities, Unrealized Losses (776) (390)
Available-for-sale Securities, Fair Value Disclosure 73,729 43,851
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 10,000
Available-for-sale Securities, Amortized Cost Basis 10,000 10,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 41
Available-for-sale Securities, Unrealized Losses (9) 0
Available-for-sale Securities, Fair Value Disclosure 9,991 10,041
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 1,359,700
Available-for-sale Securities, Amortized Cost Basis 1,357,010 1,362,527
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,768 1,768
Available-for-sale Securities, Unrealized Losses (4,319) (3,266)
Available-for-sale Securities, Fair Value Disclosure 1,355,459 1,361,029
Floating Interest Rate [Member] | 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) (3,047)
Available-for-sale Securities, Fair Value Disclosure 66,249 66,953
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) (202)
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 2,827
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | 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] 538
Available-for-sale Securities, Amortized Cost Basis 3,809 [1] 3,120
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,095 [1] 4,505
Available-for-sale Securities, Unrealized Losses 0 [1] 0
Available-for-sale Securities, Fair Value Disclosure 7,904 [1] 7,625 [2]
Derivative, Notional Amount 148,500 146,100
Fixed Interest Rate [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 214,000 187,295
Available-for-sale Securities, Amortized Cost Basis 213,975 187,401
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 12 0
Available-for-sale Securities, Unrealized Losses 0 (268)
Available-for-sale Securities, Fair Value Disclosure 213,987 187,133
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 993,680 821,619
Available-for-sale Securities, Amortized Cost Basis 993,263 821,978
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2 47
Available-for-sale Securities, Unrealized Losses (477) (536)
Available-for-sale Securities, Fair Value Disclosure 992,788 821,489
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] 2,582
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (25) 106
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (417) 359
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) $ 7,200 $ 7,000
[1] Fair value includes $7.2 million of an interest-only security with a notional amount of $148.5 million.
[2] Fair value includes $7.0 million of an interest-only security with a notional amount of $146.1 million.