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Investment Securities - Schedule of Investment Securities (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
position
Dec. 31, 2016
USD ($)
position
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 91 97
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 8,860,296 $ 8,100,257
Investment Securities [Member]    
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | position 51 36
Available-for-sale securities in a loss position for more than 12 months, qualitative disclosure, percent of amortized cost 99.50%  
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance $ 2,214,588 $ 2,513,294
Unamortized Premium/(Discount) 2,365 5,672
Available-for-sale Securities, Amortized Cost Basis 2,216,953 2,518,966
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,467 6,362
Available-for-sale Securities, Unrealized Losses (6,015) (9,477)
Available-for-sale Securities, Fair Value Disclosure 2,215,405 2,515,851
Marketable Securities [Abstract]    
Marketable Securities Unpaid Principal Balance 2,259,620 2,513,294
Marketable Securities, Amortized Cost 2,261,985 2,518,966
Marketable Securities, Unrealized Gains 4,999 6,362
Marketable Securities, Unrealized Losses (6,015) (9,477)
Marketable Securities 2,260,969  
Marketable Securities 2,260,437 2,515,851
USDA Securities [Member]    
Marketable Securities [Abstract]    
Marketable Securities 2,131,365 2,029,613
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 2,365 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 (886) (1,970)
Available-for-sale Securities, Fair Value Disclosure 18,814 17,730
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 34,462 44,442
Available-for-sale Securities, Amortized Cost Basis 34,308 44,240
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 22 1
Available-for-sale Securities, Unrealized Losses (120) (390)
Available-for-sale Securities, Fair Value Disclosure 34,210 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 1,289,123 1,359,700
Available-for-sale Securities, Amortized Cost Basis 1,291,340 1,362,527
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,215 1,768
Available-for-sale Securities, Unrealized Losses (3,368) (3,266)
Available-for-sale Securities, Fair Value Disclosure 1,290,187 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) (154) (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) 2,217 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 451 538
Available-for-sale Securities, Amortized Cost Basis 2,589 3,120
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,230 4,505
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale Securities, Fair Value Disclosure 4,819 7,625
Derivative, Notional Amount 143,700 146,100
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 45,032  
Held to Maturity; Unrealized Holding Gains 532  
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0  
Held-to-maturity Securities, Fair Value 45,564  
Held-to-Maturity Unpaid Principal Balance 45,032  
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 100,000 187,401
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (49) (268)
Available-for-sale Securities, Fair Value Disclosure 99,951 187,133
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 770,852 821,619
Available-for-sale Securities, Amortized Cost Basis 769,016 821,978
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 47
Available-for-sale Securities, Unrealized Losses (1,592) (536)
Available-for-sale Securities, Fair Value Disclosure 767,424 821,489
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 2,138 2,582
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 106
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (1,836) 359
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 4,300 $ 7,000
Fixed Interest Rate [Member] | Held-to-maturity Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) $ 0