Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details)

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STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,924,581 $ 1,046,329 $ 1,001,032
Other comprehensive income (loss) 45,848 (9,343) 2,925
Ending balance 2,513,102 1,924,581 1,046,329
Unrealized Gains (Losses) on AFS Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (5,949) 1,874 (542)
Transfer of HTM securities to AFS securities   2,785  
Cumulative effects from adoption of new accounting standards   465  
Other comprehensive income (loss) before reclassification 49,890 (10,711) 2,936
Amounts reclassified from accumulated other comprehensive income (6,064) (362) (520)
Other comprehensive income (loss) 43,826 (11,073) 2,416
Ending balance 37,877 (5,949) 1,874
Unrealized Gains (Losses) for AFS Securities Transferred to HTM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 95 2,705 3,377
Transfer of HTM securities to AFS securities   (2,785)  
Cumulative effects from adoption of new accounting standards   583  
Other comprehensive income (loss) before reclassification 0 0 0
Amounts reclassified from accumulated other comprehensive income (20) (408) (672)
Other comprehensive income (loss) (20) (408) (672)
Ending balance 75 95 2,705
Change in Fair Value of Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (3,393) (4,361) (5,179)
Transfer of HTM securities to AFS securities   0  
Cumulative effects from adoption of new accounting standards   (1,094)  
Other comprehensive income (loss) before reclassification (5,103) 1,087 (44)
Amounts reclassified from accumulated other comprehensive income 7,714 975 862
Other comprehensive income (loss) 2,611 2,062 818
Ending balance (782) (3,393) (4,361)
Unrealized Gains (Losses) on BOLI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,026) (1,102) (1,465)
Transfer of HTM securities to AFS securities   0  
Cumulative effects from adoption of new accounting standards   0  
Other comprehensive income (loss) before reclassification (646) 0 0
Amounts reclassified from accumulated other comprehensive income 77 76 363
Other comprehensive income (loss) (569) 76 363
Ending balance (1,595) (1,026) (1,102)
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (10,273) (884) (3,809)
Transfer of HTM securities to AFS securities   0  
Cumulative effects from adoption of new accounting standards   (46)  
Other comprehensive income (loss) before reclassification 44,141 (9,624) 2,892
Amounts reclassified from accumulated other comprehensive income 1,707 281 33
Other comprehensive income (loss) 45,848 (9,343) 2,925
Ending balance $ 35,575 $ (10,273) $ (884)