Deposits - Total Deposits (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Percentage Change, Checking, non-interest bearing	(3.90%)
Percentage Change, Checking, interest bearing	17.30%
Percentage Change, Savings accounts	0.60%
Percentage Change, Certificates of deposit	2.10%
Percentage change, Total	4.20%
Checking, non-interest bearing	$ 253,352	$ 263,639
Checking, interest bearing	516,238	440,174
Savings accounts	933,032	927,074
Certificates of deposit	187,973	184,166
Total deposits	$ 1,890,595	$ 1,815,053