Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 2,513,102 $ 1,924,581
Other comprehensive income (loss) 12,754 18,670
Ending balance 2,425,450 2,459,465
Unrealized Gains (Losses) on AFS Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 37,877 (5,949)
Other comprehensive income (loss) before reclassification 14,687 20,081
Amounts reclassified from accumulated other comprehensive income (1,529) (85)
Other comprehensive income (loss) 13,158 19,996
Ending balance 51,035 14,047
Unrealized Gains (Losses) for AFS Securities Transferred to HTM    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 75 95
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income (5) (5)
Other comprehensive income (loss) (5) (5)
Ending balance 70 90
Change in Fair Value of Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (782) (3,393)
Other comprehensive income (loss) before reclassification (699) (1,460)
Amounts reclassified from accumulated other comprehensive income 1,481 120
Other comprehensive income (loss) 782 (1,340)
Ending balance   (4,733)
Unrealized Gains (Losses) on BOLI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (1,595) (1,026)
Other comprehensive income (loss) before reclassification (1,289) 0
Amounts reclassified from accumulated other comprehensive income 108 19
Other comprehensive income (loss) (1,181) 19
Ending balance (2,776) (1,007)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 35,575 (10,273)
Other comprehensive income (loss) before reclassification 12,699 18,621
Amounts reclassified from accumulated other comprehensive income 55 49
Other comprehensive income (loss) 12,754 18,670
Ending balance $ 48,329 $ 8,397