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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Unrealized loss position for less than 12 months    
Fair Value $ 465,469 $ 1,433,453
Unrealized Loss (1,344) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 317,212 315,786
Unrealized Loss $ (2,569) $ (2,647)
Investment Securities [Member]    
Unrealized loss position for less than 12 months    
Number of securities in loss position | position 37 72
Unrealized loss position for more than 12 months    
Number of securities in loss position | position 46 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 19,208 18,715
Unrealized Loss (492) (985)
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 8,978 6,456
Unrealized Loss (65) (38)
Unrealized loss position for more than 12 months    
Fair Value 16,824 19,058
Unrealized Loss (128) (90)
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 376,791 927,416
Unrealized Loss (1,270) (2,907)
Unrealized loss position for more than 12 months    
Fair Value 281,180 196,416
Unrealized Loss (1,949) (1,360)
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 79,700 499,581
Unrealized Loss (9) (336)
Unrealized loss position for more than 12 months    
Fair Value 0 81,597
Unrealized Loss $ 0 $ (212)