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Securities - Allowance for Credit Losses (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 0
Total ending allowance balance (2,446)
Investment securities  
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]  
Beginning balance 0
Provision for credit loss expense (349)
Total ending allowance balance (1,617)
Mortgage-backed securities  
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]  
Beginning balance 0
Provision for credit loss expense (829)
Total ending allowance balance (829)
Cumulative Effect, Period Of Adoption, Adjustment | Investment securities  
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]  
Beginning balance (1,268)
Cumulative Effect, Period Of Adoption, Adjustment | Mortgage-backed securities  
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 0