Transfers of Financial Assets and Mortgage Servicing Assets (Schedule of Servicing Assets at Fair Value) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Transfers and Servicing [Abstract]
Beginning Balance	$ 28,690	$ 29,150
Originations of servicing assets	3,905	1,897
Changes in fair value:
Due to payoffs/paydowns	(1,492)	(1,131)
Due to market changes	263	(1,584)
Ending Balance	$ 31,366	$ 28,332