Other Income - Summary of Other Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income And Expenses [Abstract]
Prepayment fees	$ 339	$ 254	$ 389	$ 273
Servicing income	160	132	426	370
Income from Retained interests in transferred assets	42	43	123	148
Loan related income-other	33	63	113	173
Other	27	15	80	72
Other income	$ 601	$ 507	$ 1,131	$ 1,036