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Investment Securities - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Securities
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Securities
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Securities
Schedule of Available-for-sale Securities [Line Items]          
Number of securities in an unrealized loss position | Securities 131   131   97
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio 2.58%   2.58%   3.21%
OTTI charges incurred   $ 254   $ 518  
Carrying value of available-for-sale securities as security for various purposes $ 244,960   $ 244,960   $ 268,780
Debt Securities          
Schedule of Available-for-sale Securities [Line Items]          
OTTI charges incurred 0 0 0 0  
Non Agency Mortgage Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
OTTI charges incurred 0 254 0 486  
Equity Securities          
Schedule of Available-for-sale Securities [Line Items]          
OTTI charges incurred $ 0 $ 0 $ 0 $ 32