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Fair Value - Undesignated Derivative Instruments (Detail) - Mortgage Banking - Level 2 - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Assets | Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Gross assets	$ 39,547	$ 15,949
Gross liabilities	44,238	1,790
Net rate lock commitments and forward sales contracts	(4,691)	14,159
Accrued Liabilities | Forward Sales Contracts
Derivatives, Fair Value [Line Items]
Gross assets	40,007	708
Gross liabilities	1,011	926
Net rate lock commitments and forward sales contracts	$ 38,996	$ (218)

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