Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	$ 1,228	$ 1,044
Total Past Due and Non Accrual	2,808	3,164
Current	346,014	326,499
Total Loans Receivable	348,822	329,663
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	1,138	1,417
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	442	571
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	0	132
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	2	63
Total Past Due and Non Accrual	135	204
Current	86,404	67,043
Total Loans Receivable	86,539	67,247
Commercial | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	47	141
Commercial | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	86	0
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	0	0
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	474	250
Total Past Due and Non Accrual	673	701
Current	167,844	162,758
Total Loans Receivable	168,517	163,459
Commercial Real Estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	199	319
Commercial Real Estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	0	0
Commercial Real Estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	0	132
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	707	599
Total Past Due and Non Accrual	1,841	1,836
Current	76,466	79,662
Total Loans Receivable	78,307	81,498
Residential | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	780	737
Residential | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	354	500
Residential | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	0	0
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	45	132
Total Past Due and Non Accrual	159	423
Current	15,300	17,036
Total Loans Receivable	15,459	17,459
Installment | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	112	220
Installment | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	2	71
Installment | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	$ 0	$ 0