Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Lending and other client related processing costs	$ 5,539	$ 4,295
Telephone	2,703	2,233
Data processing services	2,582	1,829
Dues and publications	795	802
Postage and supplies	749	790
Other	3,839	4,844
Total other noninterest expense	$ 16,207	$ 14,793