Loans Receivable - Summary of Information Relating to Troubled Debt Restructuring by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts	1	6	19	10
Pre-Modification Outstanding Recorded Investment	$ 25	$ 139	$ 2,447	$ 1,186
Maturity Date Extension	25	139	142	1,086
Deferral of Principal Payments
Other			2,305	100
Total	25	139	2,447	1,186
Consumer Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts	1	6	7	6
Pre-Modification Outstanding Recorded Investment	25	139	116	139
Maturity Date Extension	25	139	116	139
Deferral of Principal Payments
Other
Total	25	139	116	139
Commercial Real Estate [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts			12	1
Pre-Modification Outstanding Recorded Investment			2,331	100
Maturity Date Extension			26
Deferral of Principal Payments
Other			2,305	100
Total			2,331	100
Residential Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts				3
Pre-Modification Outstanding Recorded Investment				947
Maturity Date Extension				947
Deferral of Principal Payments
Other
Total				$ 947