Loans Receivable - Schedule of Loans Receivable on Nonaccrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	$ 8,724	$ 8,637
Commercial [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	28	30
Commercial Real Estate [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	5,023	4,787
Residential [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	3,350	3,405
Consumer Home Equity [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	124	214
Consumer Dealer Auto and RV Loans [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	124	136
Consumer Other [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans receivable on nonaccrual status	$ 75	$ 65