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Investment Securities - Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Unrealized loss position for less than 12 months    
Fair Value $ 879,683 $ 1,433,453
Unrealized Loss (2,260) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 464,035 315,786
Unrealized Loss $ (3,286) $ (2,647)
Debt Securities    
Unrealized loss position for less than 12 months    
Number of securities in loss position | security 57 72
Unrealized loss position for more than 12 months    
Number of securities in loss position | security 62 48
Floating Interest Rate | 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 | Floating rate asset-backed securities    
Unrealized loss position for less than 12 months    
Fair Value 2,583 6,456
Unrealized Loss (1) (38)
Unrealized loss position for more than 12 months    
Fair Value 8,502 19,058
Unrealized Loss (6) (90)
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities    
Unrealized loss position for less than 12 months    
Fair Value 841,993 927,416
Unrealized Loss (2,244) (2,907)
Unrealized loss position for more than 12 months    
Fair Value 436,621 196,416
Unrealized Loss (2,492) (1,360)
Fixed Interest Rate | Fixed rate U.S. Treasuries    
Unrealized loss position for less than 12 months    
Fair Value 35,107 499,581
Unrealized Loss (15) (336)
Unrealized loss position for more than 12 months    
Fair Value 0 81,597
Unrealized Loss $ 0 $ (212)