Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
Property, Plant and Equipment [Line Items] | |||
Amount paid under sale-leaseback arrangement | $ 262 | ||
Gain on sale of branch | $ 297 | ||
Sale-leaseback transaction | 15 year | ||
Total lease expense | $ 2,900 | $ 2,900 | $ 4,200 |
Premises and Equipment [Member] | |||
Property, Plant and Equipment [Line Items] | |||
Depreciation included in noninterest expense | $ 7,200 | $ 13,200 | $ 10,400 |