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Investment Securities - Schedule of Investment Securities (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
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 107 91
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 9,703,115 $ 8,860,296
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 45 51
Available-for-sale securities in a loss position for more than 12 months, qualitative disclosure, percent of amortized cost 99.40%  
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance $ 2,229,866 $ 2,214,588
Unamortized Premium/(Discount) (2,558) 2,365
Available-for-sale Securities, Amortized Cost Basis 2,227,308 2,216,953
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,236 4,467
Available-for-sale Securities, Unrealized Losses (4,542) (6,015)
Available-for-sale Securities, Fair Value Disclosure 2,224,002 2,215,405
Marketable Securities, Amortized Cost Basis 2,272,340 2,261,985
Marketable Securities, Gross Unrealized Gains 2,079 4,999
Marketable Securities, Gross Unrealized Losses (4,542) (6,015)
Marketable Securities Unpaid Principal Balance 2,274,898 2,259,620
Marketable Securities [Abstract]    
Marketable Securities 2,269,877 2,260,969
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (2,558) 2,365
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 (739) (886)
Available-for-sale Securities, Fair Value Disclosure 18,961 18,814
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 30,266 34,462
Available-for-sale Securities, Amortized Cost Basis 30,123 34,308
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 18 22
Available-for-sale Securities, Unrealized Losses (85) (120)
Available-for-sale Securities, Fair Value Disclosure 30,056 34,210
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 1,336,138 1,289,123
Available-for-sale Securities, Amortized Cost Basis 1,337,754 1,291,340
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,196 2,215
Available-for-sale Securities, Unrealized Losses (2,476) (3,368)
Available-for-sale Securities, Fair Value Disclosure 1,336,474 1,290,187
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) (143) (154)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 1,616 2,217
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 400 451
Available-for-sale Securities, Amortized Cost Basis 400 2,589
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 22 2,230
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale Securities, Fair Value Disclosure 422 4,819
Derivative, Notional Amount   143,700
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 45,032 45,032
Held to Maturity; Unrealized Holding Gains 843 532
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0 0
Held-to-maturity Securities, Fair Value 45,875 45,564
Held-to-Maturity Unpaid Principal Balance 45,032 45,032
Fixed Interest Rate [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance   100,000
Available-for-sale Securities, Amortized Cost Basis   100,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   0
Available-for-sale Securities, Unrealized Losses   (49)
Available-for-sale Securities, Fair Value Disclosure   99,951
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 843,362 770,852
Available-for-sale Securities, Amortized Cost Basis 839,331 769,016
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (1,242) (1,592)
Available-for-sale Securities, Fair Value Disclosure 838,089 767,424
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 2,138
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount)   0
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (4,031) (1,836)
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount)   4,300
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 $ 0