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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 980,239 $ 652,405 $ 503,315
Unrealized gain (loss)     (3,414)
Reclassification adjustment from other comprehensive income (14,768) (29,405) (2,340)
Tax effect of current period changes (9,287) 4,261 2,386
Total other comprehensive income (loss) 14,269 (6,047) (3,368)
Ending Balance 1,012,308 980,239 652,405
Unrealized Gain (Loss) on AFS Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (9,042) (2,995) 509
Reclassification adjustment from other comprehensive income (14,768) (29,405) (3,258)
Tax effect of current period changes (9,287) 4,261 2,485
Total other comprehensive income (loss) 14,269 (6,047) (3,504)
Ending Balance 5,227 (9,042) (2,995)
Unrealized gain (loss) on AFS securities arising during the period      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Unrealized gain (loss) 16,334 19,097 (2,731)
Unrealized gain (loss) on AFS securities reclassification of HTM to AFS securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Unrealized gain (loss) 21,990    
Cash Flow Hedge      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance   0 (136)
Unrealized gain (loss)     (683)
Reclassification adjustment from other comprehensive income     918
Tax effect of current period changes     (99)
Total other comprehensive income (loss)     136
Ending Balance     0
Total      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (9,042) (2,995) 373
Total other comprehensive income (loss) 14,269 (6,047) (3,368)
Ending Balance $ 5,227 $ (9,042) $ (2,995)