Significant Accounting Policies - Summary of Notional Amount and Fair Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	$ 852
Included in mortgage banking derivatives liability:
Mortgage banking derivative liability, fair value	288	$ 175
Interest Rate Lock Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	21,791
Included in mortgage banking derivatives liability:
Derivative liability, notional amount		8,863
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	806
Included in mortgage banking derivatives liability:
Mortgage banking derivative liability, fair value		95
Forward Sale And Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	1,826
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	46
To-be-announced Mortgage-backed Securities Trades [Member]
Included in mortgage banking derivatives liability:
Derivative liability, notional amount	23,000	10,000
Included in mortgage banking derivatives liability:
Mortgage banking derivative liability, fair value	$ 288	$ 80