Allowance for Credit Losses on Loans - Summary of Activity Related to Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	$ 5,561	$ 2,290
Provision for (recovery of) credit losses	533	1,495
Charge-offs	(480)	(754)
Recoveries	210	123
Net (charge-offs) recoveries	(270)	(631)
Balance, end of period	5,824	5,561
Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		2,407
Commercial [Member] | Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	1,493	435
Provision for (recovery of) credit losses	222	938
Charge-offs	(322)	(604)
Recoveries	135	22
Net (charge-offs) recoveries	(187)	(582)
Balance, end of period	1,528	1,493
Commercial [Member] | Commercial [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		702
Commercial [Member] | Real Estate Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	2,057	760
Provision for (recovery of) credit losses	209	280
Balance, end of period	2,266	2,057
Commercial [Member] | Real Estate Commercial [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		1,017
Commercial [Member] | Other Real Estate Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	389	177
Provision for (recovery of) credit losses	23	111
Charge-offs		(42)
Net (charge-offs) recoveries		(42)
Balance, end of period	412	389
Commercial [Member] | Other Real Estate Construction [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		143
Commercial [Member] | Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	9	4
Provision for (recovery of) credit losses	9
Balance, end of period	18	9
Commercial [Member] | Other Loans [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		5
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	31
Provision for (recovery of) credit losses	25	31
Balance, end of period	56	31
Non-Commercial [Member] | Real Estate - Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	796	561
Provision for (recovery of) credit losses	(17)	159
Recoveries	2	2
Net (charge-offs) recoveries	2	2
Balance, end of period	781	796
Non-Commercial [Member] | Real Estate - Residential [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		74
Non-Commercial [Member] | Home Equity [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	582	277
Provision for (recovery of) credit losses	6	(102)
Charge-offs	(1)
Recoveries	1	32
Net (charge-offs) recoveries		32
Balance, end of period	588	582
Non-Commercial [Member] | Home Equity [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		375
Non-Commercial [Member] | Consumers Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	204	76
Provision for (recovery of) credit losses	56	78
Charge-offs	(157)	(108)
Recoveries	72	67
Net (charge-offs) recoveries	(85)	(41)
Balance, end of period	$ 175	204
Non-Commercial [Member] | Consumers Loans [Member] | Cumulative Effect of Change in Accounting Principle [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period		$ 91