Other Income - Summary of Other Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income And Expenses [Abstract]
Servicing income	$ 162	$ 113	$ 266	$ 238
Prepayment fees	50		50	19
Retained interests in transferred assets	40	51	81	105
Loan related income - other	28	63	80	110
Other	26	26	53	57
Other income	$ 306	$ 253	$ 530	$ 529