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Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income or Loss and Related Tax Effects Allocated to Each Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Before Tax        
Unrealized (losses) gains arising during the period, Before Tax $ 247 $ 447 $ 56 $ 4,777
Change in allowance for credit losses, Before Tax 70   596  
Call and repayment (gains) losses charged to investment income, Before Tax (15) (2) (231) (1)
Reclassification adjustment for net realized losses (gains) 21 (26) (1,133) (59)
Total other comprehensive (losses) gains, Before Tax 323 419 (712) 4,717
Income Tax Effect        
Unrealized (losses) gains arising during the period, Income Tax Effect 61 90 14 1,188
Change in allowance for credit losses, Income Tax Effect 17   146  
Call and repayment (gains) losses charged to investment income, Income Tax Effect (4)   (56)  
Reclassification adjustment for realized losses (gains), Income Tax Effect 5 (7) (278) (15)
Total other comprehensive (losses) gains, Income Tax Effect 79 83 (174) 1,173
Net of Tax        
Unrealized (losses) gains arising during the period, Net of Tax 186 357 42 3,589
Change in allowance for credit losses, Net of Tax 53   450  
Call and repayment (gains) losses charged to investment income, Net of Tax (11) (2) (175) (1)
Reclassification adjustment for realized losses (gains), Net of Tax 16 (19) (855) (44)
Total other comprehensive income (loss), net of income taxes $ 244 $ 336 $ (538) $ 3,544