Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	$ 1,524	$ 958
Total Past Due and Non Accrual	3,069	1,869
Current	308,853	313,885
Total Loans Receivable	311,922	315,754
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	1,379	756
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	36	28
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	130	127
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	64	46
Total Past Due and Non Accrual	295	46
Current	57,183	52,240
Total Loans Receivable	57,478	52,286
Commercial | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	101	0
Commercial | 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 | 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	130	0
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	407	247
Total Past Due and Non Accrual	935	768
Current	151,329	157,546
Total Loans Receivable	152,264	158,314
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	528	394
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	127
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual	789	658
Total Past Due and Non Accrual	1,419	967
Current	81,438	82,903
Total Loans Receivable	82,857	83,870
Residential | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	598	292
Residential | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	32	17
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	264	7
Total Past Due and Non Accrual	420	88
Current	18,483	21,196
Total Loans Receivable	19,323	21,284
Installment | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	152	70
Installment | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non Accrual	4	11
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