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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Securities Available-for-Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,835 $ 2,438 $ (2,995) $ 509
Unrealized gain arising during the period 12,565 (3,420) 39,374 (90)
Reclassification adjustment from other comprehensive income (12,824) 0 (29,613) 2
Tax effect of current period changes 107 1,438 (4,083) 35
Total changes, net of taxes (152) (1,982) 5,678 (53)
Balance at end of period 2,683 456 2,683 456
Cash Flow Hedge        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period 0 (240) 0 (136)
Unrealized gain arising during the period 0 581 0 401
Reclassification adjustment from other comprehensive income 0 0 0 0
Tax effect of current period changes 0 (245) 0 (169)
Total changes, net of taxes 0 336 0 232
Balance at end of period 0 96 0 96
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period 2,835 2,198 (2,995) 373
Unrealized gain arising during the period 12,565 (2,839) 39,374 311
Reclassification adjustment from other comprehensive income (12,824) 0 (29,613) 2
Tax effect of current period changes 107 1,193 (4,083) (134)
Total changes, net of taxes (152) (1,646) 5,678 179
Balance at end of period $ 2,683 $ 552 $ 2,683 $ 552