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Investment Securities Gross Unrealized Losses - AFS (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
securities
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 42,535 $ 150,616
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses) (5,333) (1,142)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 30,998 56,826
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses) (671) (1,148)
Available-for-sale securities, total, continuous unrealized loss position, fair value 73,533 207,442
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses) $ (6,004) (2,290)
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sales securities in unrealized loss positions, qualitative disclosure, number of positions | securities 6  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 0 54,521
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses) 0 (335)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 26,557 35,546
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses) (631) (294)
Available-for-sale securities, total, continuous unrealized loss position, fair value 26,557 90,067
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses) $ (631) (629)
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sales securities in unrealized loss positions, qualitative disclosure, number of positions | securities 1  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 0 45,132
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses) 0 (174)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 4,441 4,687
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses) (40) (59)
Available-for-sale securities, total, continuous unrealized loss position, fair value 4,441 49,819
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses) $ (40) (233)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value   3,641
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses)   (4)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value   7,075
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses)   (13)
Available-for-sale securities, total, continuous unrealized loss position, fair value   10,716
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses)   (17)
Collateralized loan obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sales securities in unrealized loss positions, qualitative disclosure, number of positions | securities 8  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 42,535 42,823
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses) (5,333) (128)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses) 0 0
Available-for-sale securities, total, continuous unrealized loss position, fair value 42,535 42,823
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses) $ (5,333) (128)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value   4,499
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized (losses)   (501)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value   9,518
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized (losses)   (782)
Available-for-sale securities, total, continuous unrealized loss position, fair value   14,017
Available-for-sale securities, continuous unrealized loss position, gross unrealized (losses)   $ (1,283)