Servicing Rights - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Income earned on mortgage servicing rights	$ 1,253,000	$ 188,000
Mortgage loans portfolios serviced	1,900,000,000		1,370,000,000
Escrow balances maintained in connection with serviced loans	6,700,000		5,900,000
Mortgage servicing rights, at carrying value	941,100,000
Mortgage servicing rights, at fair value	$ 10,100,000
Mortgage servicing rights, sale closing date	Apr. 01, 2014
Discount rate used to calculate present value of cash flows	7.25%