Commitments and Contingencies (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	$ 5,989,648	$ 5,680,438
Standby letters of credit
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	63,027	65,154
Forward commitments to sell loans
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	$ 6,579	$ 10,008