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Securities - Other Than Temporary Impairments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit losses at end of prior year $ 0 $ 60
Other-than-temporary impairment credit losses on securities not previously OTTI 50 0
Increases for additional credit losses on securities previously determined to be OTTI 0 0
Reduction for increases in cash flows 0 0
Reduction due to credit impaired securities sold or fully settled 0 (60)
Ending balance of cumulative credit losses recognized in earnings at end of period $ 50 $ 0