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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss by Component Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Loss [Line Items]        
Unrealized holding loss on available-for-sale securities arising during the period, Pretax $ (1,923) $ (3,607) $ (596) $ (10,145)
Beginning balance, After-tax     (12,919)  
Other comprehensive loss (1,481) (2,790) (397) (7,878)
Ending Balance, After-tax (13,316)   (13,316)  
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance, Pretax (14,981) (9,131) (16,354) (2,691)
Unrealized holding loss on available-for-sale securities arising during the period, Pretax (1,923) (3,607) (596) (10,145)
Amortization of held-to-maturity discount resulting from transfer, Pretax 48 75 94 173
Total other comprehensive loss, Pretax (1,875) (3,532) (502) (9,972)
Ending balance, Pretax (16,856) (12,663) (16,856) (12,663)
Beginning balance, Tax Effect 3,146 1,918 3,435 566
Unrealized holding loss on available-for-sale securities arising during the period, Tax Effect 404 757 125 2,130
Amortization of held-to-maturity discount resulting from transfer, Tax Effect (10) (15) (20) (36)
Total other comprehensive loss, Tax Effect 394 742 105 2,094
Ending Balance, Tax Effect 3,540 2,660 3,540 2,660
Beginning balance, After-tax (11,835) (7,213) (12,919) (2,125)
Unrealized holding loss on available-for-sale securities arising during the period, After-Tax (1,519) (2,850) (471) (8,015)
Amortization of held-to-maturity discount resulting from transfer, After-tax 38 60 74 137
Other comprehensive loss (1,481) (2,790) (397) (7,878)
Ending Balance, After-tax $ (13,316) $ (10,003) $ (13,316) $ (10,003)