XML 66 R59.htm IDEA: XBRL DOCUMENT v3.24.3
Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 373,808,000 $ 349,876,000 $ 372,002,000 $ 334,835,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) 14,422,000 (23,692,000) 7,619,000 (21,417,000)
Ending balance 394,438,000 332,745,000 394,438,000 332,745,000
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (49,827,000) (50,496,000) (43,024,000) (52,771,000)
Other comprehensive income (loss) before reclassifications 14,422,000 (23,692,000) 7,619,000 (21,417,000)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) 14,422,000 (23,692,000) 7,619,000 (21,417,000)
Ending balance (35,405,000) (74,188,000) (35,405,000) (74,188,000)
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,506,000) (5,274,000) (4,506,000) (5,274,000)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) 0 0 0 0
Ending balance (4,506,000) (5,274,000) (4,506,000) (5,274,000)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (54,333,000) (55,770,000) (47,530,000) (58,045,000)
Other comprehensive income (loss) before reclassifications 14,422,000 (23,692,000) 7,619,000 (21,417,000)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) 14,422,000 (23,692,000) 7,619,000 (21,417,000)
Ending balance $ (39,911,000) $ (79,462,000) $ (39,911,000) $ (79,462,000)