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Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
component
Accumulated Other Comprehensive Income (Loss)        
Number of securities component | component       1
Changes in accumulated other comprehensive income        
Balance, beginning of period $ (1,031) $ (3,092) $ (2,411) $ (1,693)
Net unrealized gains (losses) during the period 1,382 (397) 2,762 (1,796)
Other comprehensive income (loss), net of tax 1,382 (397) 2,762 (1,796)
Balance, end of period $ 351 $ (3,489) $ 351 $ (3,489)