Deposits - Time Deposits by Remaining Maturity (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Time Deposits [Line Items]
Three months or less	$ 103,710
Three to six months	106,375
Six to twelve months	174,391
Over twelve months	511,951
Total	896,427
Certificates of Deposit [Member]
Time Deposits [Line Items]
Three months or less	94,704
Three to six months	98,110
Six to twelve months	157,512
Over twelve months	394,627
Total	744,953
Other Time Deposits [Member]
Time Deposits [Line Items]
Three months or less	9,006
Three to six months	8,265
Six to twelve months	16,879
Over twelve months	117,324
Total	$ 151,474