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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
position
Dec. 31, 2016
USD ($)
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 $ 1,034,964 $ 1,308,744
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 388,534 564,801
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,909) (1,844)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ (2,106) $ (7,633)
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 91 97
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 99.50%  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | position 51 36
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 18,814 17,730
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (886) (1,970)
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 0 4,654
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 23,145 38,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (120) (380)
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 292,522 384,586
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 221,641 442,041
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,337) (1,030)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ (1,031) (2,236)
Floating Interest Rate [Member] | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   66,953
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses   (3,047)
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield 2.50%  
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 $ 742,442 732,371
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 24,983 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,572) (536)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (20) 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 0 187,133
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 99,951 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (268)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ (49) $ 0