Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Sep. 30, 2013 Quarter	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Credit card and other personal loans charged off period no later than period		180 days
Number of Quarters | Quarter	19
Percentage of excess loan balance for watch category		90.00%
Impaired loans measurement		Impaired loans measured for impairment generally include: (1) non-accruing Special mention, Substandard and Doubtful loans in excess of $250,000; (2) Substandard and Doubtful loans in excess of $500,000; (3) Special Mention loans in excess of $500,000 if any of the loans in the relationship are more than 30 days past due or if the borrower has filed for bankruptcy; and (4) all troubled debt restructurings (“TDRs”).
Loan Receivables		$ 134,334,000	$ 132,038,000
Special Mention
Significant Accounting Policies [Line Items]
Loan Receivables		$ 4,859,000	$ 4,346,000
Loan due days		30 days
Residential First Mortgages
Significant Accounting Policies [Line Items]
Minimum balance in order to assign a risk rating grade		$ 1,000,000
Consumer Loans
Significant Accounting Policies [Line Items]
Minimum balance in order to assign a risk rating grade		$ 250,000
Minimum
Significant Accounting Policies [Line Items]
Number of days past due for a loan to remain on accrual status		90 days
Minimum | Non-accruing Special mention, Substandard and Doubtful loans
Significant Accounting Policies [Line Items]
Loan Receivables		$ 250,000
Minimum | Substandard and Doubtful loans
Significant Accounting Policies [Line Items]
Loan Receivables		500,000
Minimum | Special Mention
Significant Accounting Policies [Line Items]
Loan Receivables		$ 500,000