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Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 35,007 $ 31,193 $ 33,319 $ 18,861
Total gains or losses included in earnings 4 0 (7) 0
Total gains or losses included in other comprehensive income 0 0 0 0
Purchases 1,147 1,544 3,383 14,161
Issuances 0 0 0 0
Sales (450) 0 (450) 0
Settlements (219) (158) (756) (512)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 69
Balance, end of period 35,489 32,579 35,489 32,579
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0
Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 6,182 6,182 6,182 1,170
Total gains or losses included in earnings 0 0 0 0
Total gains or losses included in other comprehensive income 0 0 0 0
Purchases 0 0 0 5,000
Issuances 0 0 0 0
Sales (450) 0 (450) 0
Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 12
Balance, end of period 5,732 6,182 5,732 6,182
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0
Other Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 28,825 25,011 27,137 17,691
Total gains or losses included in earnings 4 0 (7) 0
Total gains or losses included in other comprehensive income 0 0 0 0
Purchases 1,147 1,544 3,383 9,161
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (219) (158) (756) (512)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 57
Balance, end of period 29,757 26,397 29,757 26,397
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 $ 0 $ 0 $ 0 $ 0