Deposits - Total Deposits (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Percentage Change, Checking, non-interest bearing	11.10%
Percentage Change, Checking, interest bearing	0.00%
Percentage Change, Savings accounts	9.70%
Percentage Change, Certificates of deposit	(30.20%)
Percentage change, Total	1.70%
Checking, non-interest bearing	$ 245,914	$ 221,293
Checking, interest bearing	450,042	450,216
Savings accounts	985,473	898,043
Certificates of deposit	185,435	265,762
Total deposits	$ 1,866,864	$ 1,835,314