XML 31 R32.htm IDEA: XBRL DOCUMENT v3.19.3
Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Unrealized loss position for less than 12 months    
Fair Value $ 1,038,301 $ 1,433,453
Unrealized Loss (1,591) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 343,049 315,786
Unrealized Loss $ (2,658) $ (2,647)
Investment Securities [Member]    
Unrealized loss position for less than 12 months    
Number of securities in loss position | position 61 72
Unrealized loss position for more than 12 months    
Number of securities in loss position | position 50 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 8,755 6,456
Unrealized Loss (48) (38)
Unrealized loss position for more than 12 months    
Fair Value 15,814 19,058
Unrealized Loss (127) (90)
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 938,135 927,416
Unrealized Loss (1,461) (2,907)
Unrealized loss position for more than 12 months    
Fair Value 308,027 196,416
Unrealized Loss (2,039) (1,360)
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 91,411 499,581
Unrealized Loss (82) (336)
Unrealized loss position for more than 12 months    
Fair Value 0 81,597
Unrealized Loss $ 0 $ (212)