Loans Receivable - Summary of Information Relating to Troubled Debt Restructuring by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Contract	Jun. 30, 2013 Contract	Jun. 30, 2014 Contract	Jun. 30, 2013 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	14	5	18
Pre-Modification Outstanding Recorded Investment	$ 46	$ 2,303	$ 138	$ 2,422
Maturity Date Extension	46	41	53	117
Deferral of Principal Payments
Other		2,262	85	2,305
Total	46	2,303	138	2,422
Consumer Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	3	2	6
Pre-Modification Outstanding Recorded Investment	46	15	57	91
Maturity Date Extension	46	15	46	91
Deferral of Principal Payments
Other			11
Total	46	15	57	91
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		11		12
Pre-Modification Outstanding Recorded Investment		2,288		2,331
Maturity Date Extension		26		26
Deferral of Principal Payments
Other		2,262		2,305
Total		2,288		2,331
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Pre-Modification Outstanding Recorded Investment			57
Maturity Date Extension			0
Deferral of Principal Payments
Other			57
Total			57
Consumer Dealer Auto and RV Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			2
Pre-Modification Outstanding Recorded Investment			24
Maturity Date Extension			7
Deferral of Principal Payments
Other			17
Total			$ 24