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Investment Securities - Schedule of Investment Securities (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
position
Debt Securities, Available-for-sale [Abstract]    
Derivative, Notional Amount $ 9,955,745 $ 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 48 51
Available-for-sale securities in a loss position for more than 12 months, qualitative disclosure, percent of amortized cost 99.20%  
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance $ 2,226,409 $ 2,214,588
Unamortized Premium/(Discount) (3,489) 2,365
Available-for-sale Securities, Amortized Cost Basis 2,222,920 2,216,953
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 860 4,467
Available-for-sale Securities, Unrealized Losses (5,928) (6,015)
Available-for-sale Securities, Fair Value Disclosure 2,217,852 2,215,405
Marketable Securities, Amortized Cost Basis 2,267,952 2,261,985
Marketable Securities, Gross Unrealized Gains 1,422 4,999
Marketable Securities, Gross Unrealized Losses (5,928) (6,015)
Marketable Securities Unpaid Principal Balance 2,271,441 2,259,620
Marketable Securities [Abstract]    
Marketable Securities 2,263,446 2,260,969
Available-for-sale Securities [Member] | Investment Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) (3,489) 2,365
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 19,700 19,700
Available-for-sale Securities, Amortized Cost Basis 19,700 19,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (985) (886)
Available-for-sale Securities, Fair Value Disclosure 18,715 18,814
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 28,940 34,462
Available-for-sale Securities, Amortized Cost Basis 28,804 34,308
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2 22
Available-for-sale Securities, Unrealized Losses (128) (120)
Available-for-sale Securities, Fair Value Disclosure 28,678 34,210
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 1,379,472 1,289,123
Available-for-sale Securities, Amortized Cost Basis 1,381,000 1,291,340
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 721 2,215
Available-for-sale Securities, Unrealized Losses (4,267) (3,368)
Available-for-sale Securities, Fair Value Disclosure 1,377,454 1,290,187
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) (136) (154)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) 1,528 2,217
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 384 451
Available-for-sale Securities, Amortized Cost Basis 385 2,589
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 18 2,230
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale Securities, Fair Value Disclosure 403 4,819
Derivative, Notional Amount   143,700
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 45,032 45,032
Held to Maturity; Unrealized Holding Gains 562 532
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Fair Value 45,594 45,564
Held-to-Maturity Unpaid Principal Balance 45,032 45,032
Fixed Interest Rate [Member] | USDA Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance   100,000
Available-for-sale Securities, Amortized Cost Basis   100,000
Debt Securities, Available-for-sale, 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]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 797,913 770,852
Available-for-sale Securities, Amortized Cost Basis 793,031 769,016
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 119 0
Available-for-sale Securities, Unrealized Losses (548) (1,592)
Available-for-sale Securities, Fair Value Disclosure 792,602 767,424
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) 1 2,138
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | USDA Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount)   0
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) (4,882) (1,836)
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount)   4,300
Fixed Interest Rate [Member] | Held-to-maturity Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Unamortized Premium/(Discount) $ 0 $ 0