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Investment Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 8,791,110 $ 8,100,257
Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 2,229,592 2,513,294
Unamortized Premium/(Discount) 3,406 5,672
Available-for-sale Securities, Amortized Cost Basis 2,232,998 2,518,966
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 5,128 6,362
Available-for-sale Securities, Unrealized Losses (3,160) (9,477)
Available-for-sale Securities, Fair Value Disclosure 2,234,966 2,515,851
Marketable Securities [Abstract]    
Marketable Securities Unpaid Principal Balance 2,229,592 2,513,294
Marketable Securities, Amortized Cost 2,232,998 2,518,966
Marketable Securities, Unrealized Gains 5,128 6,362
Marketable Securities, Unrealized Losses (3,160) (9,477)
Marketable Securities 2,234,966 2,515,851
USDA Securities [Member]    
Marketable Securities [Abstract]    
Marketable Securities 2,107,149 2,029,613
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 3,406 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 19,700 19,700
Available-for-sale Securities, Amortized Cost Basis 19,700 19,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (1,182) (1,970)
Available-for-sale Securities, Fair Value Disclosure 18,518 17,730
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 35,870 44,442
Available-for-sale Securities, Amortized Cost Basis 35,705 44,240
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 20 1
Available-for-sale Securities, Unrealized Losses (123) (390)
Available-for-sale Securities, Fair Value Disclosure 35,602 43,851
Floating 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   10,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   41
Available-for-sale Securities, Unrealized Losses   0
Available-for-sale Securities, Fair Value Disclosure   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 1,308,236 1,359,700
Available-for-sale Securities, Amortized Cost Basis 1,310,622 1,362,527
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,858 1,768
Available-for-sale Securities, Unrealized Losses (1,276) (3,266)
Available-for-sale Securities, Fair Value Disclosure 1,312,204 1,361,029
Floating Interest Rate [Member] | Subordinated Debt [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance   70,000
Available-for-sale Securities, Amortized Cost Basis   70,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   0
Available-for-sale Securities, Unrealized Losses   (3,047)
Available-for-sale Securities, Fair Value Disclosure   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) (165) (202)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount)   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) 2,386 2,827
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Subordinated Debt [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount)   0
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 468 538 [1]
Available-for-sale Securities, Amortized Cost Basis 2,715 3,120 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,250 4,505 [1]
Available-for-sale Securities, Unrealized Losses 0 0 [1]
Available-for-sale Securities, Fair Value Disclosure 4,965 [2] 7,625 [1]
Derivative, Notional Amount 144,300 146,100
Fixed Interest Rate [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 100,000 187,295
Available-for-sale Securities, Amortized Cost Basis 99,992 187,401
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (121) (268)
Available-for-sale Securities, Fair Value Disclosure 99,871 187,133
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 765,318 821,619
Available-for-sale Securities, Amortized Cost Basis 764,264 821,978
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 47
Available-for-sale Securities, Unrealized Losses (458) (536)
Available-for-sale Securities, Fair Value Disclosure 763,806 821,489
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 2,247 2,582 [1]
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (8) 106
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (1,054) 359
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) $ 4,500 $ 7,000
[1] Fair value includes $7.0 million of an interest-only security with a notional amount of $146.1 million.
[2] Fair value includes $4.5 million of an interest-only security with a notional amount of $144.3 million.