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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
position
Dec. 31, 2015
USD ($)
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 $ 1,053,956 $ 1,799,338
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 343,386 194,540
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (2,040) (4,363)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ (7,879) $ (6,550)
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 77 69
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 98.00%  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | position 27 17
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 1 3
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 17,582 18,124
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 (2,118) (1,576)
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 25,446 44,552
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 19,540 9,975
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (95) (464)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (445) (312)
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 610,561 794,959
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 239,860 100,192
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-Sale Continuous Unrealized Loss Position Less than 12 Months, Aggregate Losses (1,874) (3,408)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (1,720) (911)
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 66,404 66,249
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 (3,596) (3,751)
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 368,017 944,842
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 (47) (477)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 $ 0
Fixed Interest Rate [Member] | USDA 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 49,932  
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 (24)  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ 0