Loans and Allowance for Credit Losses on Loans - Analysis Of Past Due Loans By Portfolio Segment Including Non-Accrual Loans Without ACL (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Total Loans	$ 421,864	$ 419,474
Non-Accrual Loans	128	478
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,442	420
Greater than 90 Days [Member]
Financing Receivable, Past Due [Line Items]
Total Loans		117
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,442	537
Current
Financing Receivable, Past Due [Line Items]
Total Loans	420,422	418,937
CRE [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	75,406	80,588
CRE [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	75,406	80,588
MF [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	4,220	4,839
MF [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	4,220	4,839
C+I [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	26,805	22,541
C+I [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	26,805	22,541
ADL [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	15,806	12,875
ADL [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	15,806	12,875
RES [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	264,362	265,249
Non-Accrual Loans	128	361
RES [Member] \| 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,102	262
RES [Member] \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,102	262
RES [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	263,260	264,987
HELOC [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	23,572	20,652
HELOC [Member] \| 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	340	136
HELOC [Member] \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	340	136
HELOC [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	23,232	20,516
CON [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	11,693	12,730
Non-Accrual Loans		117
CON [Member] \| 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans		22
CON [Member] \| Greater than 90 Days [Member]
Financing Receivable, Past Due [Line Items]
Total Loans		117
CON [Member] \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans		139
CON [Member] \| Current
Financing Receivable, Past Due [Line Items]
Total Loans	$ 11,693	$ 12,591