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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Unrealized loss position for less than 12 months    
Fair Value $ 984,827 $ 1,433,453
Unrealized Loss (3,465) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 536,464 315,786
Unrealized Loss $ (2,886) $ (2,647)
Investment Securities [Member]    
Unrealized loss position for less than 12 months    
Number of securities in loss position | position 48 72
Unrealized loss position for more than 12 months    
Number of securities in loss position | position 63 48
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Unrealized loss position for less than 12 months    
Fair Value $ 0 $ 0
Unrealized Loss 0 0
Unrealized loss position for more than 12 months    
Fair Value 18,912 18,715
Unrealized Loss (788) (985)
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 6,179 6,456
Unrealized Loss (56) (38)
Unrealized loss position for more than 12 months    
Fair Value 18,173 19,058
Unrealized Loss (89) (90)
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 715,948 927,416
Unrealized Loss (3,368) (2,907)
Unrealized loss position for more than 12 months    
Fair Value 381,997 196,416
Unrealized Loss (1,948) (1,360)
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 262,700 499,581
Unrealized Loss (41) (336)
Unrealized loss position for more than 12 months    
Fair Value 117,382 81,597
Unrealized Loss $ (61) $ (212)