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Premises, Equipment and Leases - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Write-downs of long-term investments in land and buildings related to expected closures $ 259 $ 935  
Depreciation and amortization expense 4,135 4,405 $ 4,666
Lease expense 862 $ 1,060 $ 1,180
Future minimum lease payments $ 5