Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit
Real estate construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	287,914	334,130
Real estate mortgage loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	413,215	432,608
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	36,817	38,986
Commercial loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	900,124	814,732
Consumer loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	613,568	598,264
Deposit account overdraft privilege
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 126,515	$ 125,317

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.