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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
position
Dec. 31, 2014
USD ($)
position
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,799,338 $ 495,501
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 194,540 183,763
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (4,363) (228)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ (6,550) $ (9,983)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 69 35
Investment Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale securities in a loss position for more than 12 months, qualitative disclosure, percent of amortized cost 97.00%  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | position 17 15
Standard & Poor's, A- Rating [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 3 1
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 18,124 40,576
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (1,576) (6,024)
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 44,552 19,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 9,975 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (464) (37)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (312) 0
Floating Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,991  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (9)  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0  
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 794,959 76,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 100,192 76,867
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (3,408) (164)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (911) (279)
Floating Interest Rate [Member] | GSE Subordinated Debt [Member}    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 66,249 66,320
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (3,751) (3,680)
Floating Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   74,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses   (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses   0
Fixed Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 9,994  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (5)  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0  
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 944,842 325,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (477) (16)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ 0 $ 0