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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period $ (2,995) $ 373
Unrealized gain arising during the period 26,809 3,150
Reclassification adjustment from other comprehensive income (16,789) 2
Tax effect of current period changes (4,190) (1,327)
Total changes, net of taxes 5,830 1,825
Balance at end of period 2,835 2,198
Securities Available-for-Sale    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period (2,995) 509
Unrealized gain arising during the period 26,809 3,330
Reclassification adjustment from other comprehensive income (16,789) 2
Tax effect of current period changes (4,190) (1,403)
Total changes, net of taxes 5,830 1,929
Balance at end of period 2,835 2,438
Cash Flow Hedge    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period 0 (136)
Unrealized gain arising during the period 0 (180)
Reclassification adjustment from other comprehensive income 0 0
Tax effect of current period changes 0 76
Total changes, net of taxes 0 (104)
Balance at end of period $ 0 $ (240)