Deposits - Time Deposits by Remaining Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Time Deposits [Line Items]
Three months or less	$ 127,595
Three to six months	130,171
Six to twelve months	216,124
Over twelve months	383,580
Total, time deposits of $100,000 or more	857,470	795,113
Certificates of Deposit [Member]
Time Deposits [Line Items]
Three months or less	117,298
Three to six months	121,512
Six to twelve months	190,656
Over twelve months	258,989
Total, time deposits of $100,000 or more	688,455
Other Time Deposits [Member]
Time Deposits [Line Items]
Three months or less	10,297
Three to six months	8,659
Six to twelve months	25,468
Over twelve months	124,591
Total, time deposits of $100,000 or more	$ 169,015