Mortgage Banking Derivatives - Summary of Notional Amount and Fair Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Included in mortgage banking derivatives liability:
Derivative liability, fair value	$ 196,815	$ 205,630
Interest Rate Lock Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	30,933	28,939
Included in mortgage banking derivatives asset:
Derivative asset, fair value	269	1,016
Forward Sale And Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount		8,417
Included in mortgage banking derivatives asset:
Derivative asset, fair value		253
To-be-announced Mortgage-backed Securities Trades [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	50,000
Included in mortgage banking derivatives liability:
Derivative liability, notional amount		44,000
Included in mortgage banking derivatives asset:
Derivative asset, fair value	$ 1,216
Included in mortgage banking derivatives liability:
Derivative liability, fair value		$ 50