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INVESTMENT SECURITIES - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
position
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
position
Jun. 30, 2015
USD ($)
Dec. 31, 2015
position
Investment [Line Items]          
Percentage of debt securities considered to be of investment-grade 98.00%   98.00%    
Percentage of tax-exempt municipal securities classified as pre-refunded 6.00%   6.00%    
General obligation bonds as percentage of tax-exempt municipal securities that were not pre-refunded     47.00%    
Special revenue bonds as percentage of tax exempt municipal securities that were not pre-refunded     53.00%    
Maximum percentage of any general obligation bonds in one state     10.00%    
Percentage of tax exempt securities 4.60%   4.60%    
Percentage of corporate securities associated with financial services industry 24.00%   24.00%   25.00%
Securities in unrealized loss positions, number of positions 190   190    
Number of positions         2,070
Other-than-temporary impairments | $ $ 0 $ 0 $ 0 $ 0  
Residential Mortgage-Backed Securities          
Investment [Line Items]          
Mortgage-backed Securities as Percentage of Agency Mortgage-backed Securities 99.00%   99.00%   98.00%