Deposits - Major Classifications of Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Banking And Thrift [Abstract]
Interest-bearing demand deposits	$ 674,458	$ 697,701
Non-interest-bearing demand deposits	405,208	397,311
Savings deposits	244,405	241,754
Time deposits under $250,000	349,142	338,615
Time deposits $250,000 or more	33,968	28,789
Brokered time deposits	26,808	37,193
Total deposits	$ 1,733,989	$ 1,741,363