Deposits - Total Deposits (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Percentage Change, Checking, non-interest bearing	11.20%
Percentage Change, Checking, interest bearing	20.10%
Percentage Change, Savings accounts	3.70%
Percentage Change, Certificates of deposit	30.70%
Percentage change, Total	11.50%
Checking, non-interest bearing	$ 293,049	$ 263,639
Checking, interest bearing	528,728	440,174
Savings accounts	961,260	927,074
Certificates of deposit	240,744	184,166
Total deposits	$ 2,023,781	$ 1,815,053