Fair Value Measurements - Summary of Estimated Fair Value of Financial Instruments that are not Required to be Measured or Reported at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets:
Cash and cash equivalents (Level 1)	$ 220,182	$ 166,100
Securities held to maturity (Level 2)	28,083	31,967
Financial liabilities:
Long-term borrowings (Level 3)	102,688	112,549
Short-term borrowings (Level 1)	0	10,000
Note payable (Level 3)	559	565
Subordinated Notes (Level 3)	62,129	61,984
Carrying Amount [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents (Level 1)	220,182	166,100
Accrued interest receivable (Level 1)	9,545	9,870
Restricted investments in bank stock (Level 1)	4,780	5,209
Cash surrender value of life insurance (Level 1)	52,507	52,079
Financial liabilities:
Non-maturity deposits (Level 1)	1,776,412	1,723,849
Short-term borrowings (Level 1)		10,000
Accrued interest payable (Level 1)	2,581	1,865
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities held to maturity (Level 2)	28,083	31,508
Carrying Amount [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net of allowance for credit losses (Level 3)	2,247,322	2,229,314
Financial liabilities:
Time Deposits (Level 3)	657,282	636,733
Long-term borrowings (Level 3)	40,000	40,000
Note payable (Level 3)	559	565
Subordinated Notes (Level 3)	62,129	61,984
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents (Level 1)	220,182	166,100
Accrued interest receivable (Level 1)	9,545	9,870
Restricted investments in bank stock (Level 1)	4,780	5,209
Cash surrender value of life insurance (Level 1)	52,507	52,079
Financial liabilities:
Non-maturity deposits (Level 1)	1,776,412	1,723,849
Short-term borrowings (Level 1)		10,000
Accrued interest payable (Level 1)	2,581	1,865
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities held to maturity (Level 2)	26,764	30,284
Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net of allowance for credit losses (Level 3)	2,250,242	2,231,057
Financial liabilities:
Time Deposits (Level 3)	655,882	634,875
Long-term borrowings (Level 3)	40,280	40,256
Note payable (Level 3)	559	565
Subordinated Notes (Level 3)	$ 60,700	$ 60,251