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Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Derivatives Fair Value [Line Items]    
Swap assets $ 19,784 $ 16,579
Accrued Liabilities and Other Liabilities 19,784 16,579
Long [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In An Asset Position Notional Amount 2,250 6,980
Fair Value Of Interest Rate Swaps With Loan Customers In An Asset Position 11 269
Short [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In A Liability Position Notional Amount 204,975 205,590
Fair Value Of Interest Rate Swaps With Loan Customers In A Liability Position 19,784 16,579
Short [Member] | Financial Institutions [Member]    
Derivatives Fair Value [Line Items]    
Counterparty Positions With Financial Institutions In An Asset Position Notional Amount 207,225 212,570
Fair Value Of Counterparty Positions With Financial Institutions In An Asset Position $ 19,773 $ 16,310