Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income and Expenses [Abstract]
Lending and other client related processing costs	$ 3,541	$ 3,704	$ 7,836	$ 7,253
Telephone	2,416	2,544	4,649	4,503
Data processing services	2,387	1,358	4,216	3,191
Postage and supplies	784	727	1,574	1,492
Dues and publications	647	697	1,449	1,282
Other	4,191	5,279	9,035	10,110
Total other noninterest expense	$ 13,966	$ 14,309	$ 28,759	$ 27,831