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Subordinated Notes (Details) - Subordinated Notes - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 20, 2016
Subordinated Notes      
Face amount     $ 25
Interest rate     6.00%
Redemption price percentage of outstanding principal amount 100.00%    
Proceeds from subordinated notes included in the Bank's Tier 1 capital $ 21 $ 21  
Minimum      
Subordinated Notes      
Notice period for redeem the subordinated notes 30 days    
Maximum      
Subordinated Notes      
Notice period for redeem the subordinated notes 60 days    
LIBOR      
Subordinated Notes      
Variable interest rate (as a percent) 487.00%