Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014 Point	Mar. 31, 2013	Dec. 31, 2013 Point
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days principal payments should be past due for recognition of income on a loan be discontinued and previously accrued interest is reversed	90 days
Loan charge-off, amount	$ 133,000	$ 317,000
Loan portfolio risk factor	1.18		1.18
Days loans are past due to be nonperforming loans	90 days		90 days
Commitments to lend additional funds	0		0
Allowance for loan losses related to TDRs modified	0
Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan charge-off, amount	52,000	105,000
Loan charge-off period	90 days
Bank Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan charge-off period	45 days
Charge Off Treatment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal charge-offs	0
Qualitative Factor Economic Condition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan portfolio risk factor	1.20		1.20
Qualitative Factor Past Due Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan portfolio risk factor	1.20		1.20
Qualitative Factor Other Internal and External Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan portfolio risk factor	1.30		1.30
Overall Qualitative Factor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in estimated allowance for loan losses	486,000		471,000
Partial charge-off loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan charge-off, amount	486,000
Number of loan	12
Classified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in estimated allowance for loan losses	512,000		521,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period of performance borrower need to demonstrate for a loan be restored to accrual status	6 months
Value of significant property	$ 200,000