Deposits (Escrow, Savings and Investment Certificate Accounts) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Banking And Thrift [Abstract]
Interest bearing		$ 2,084,926	$ 1,962,351
Non-interest bearing		494,077	266,281
Escrow accounts		2,579,003	2,228,632
Business checking and other deposits	[1]	120,012	104,082
Deposits, Total		$ 2,699,015	$ 2,332,714
Weighted average interest rate, Escrow accounts		0.10%	0.11%

[1] Business checking and other deposits primarily reflect non-interest bearing accounts.