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 ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   $ 1,046,329,000 $ 2,513,102,000 $ 1,924,581,000 $ 1,046,329,000
Other comprehensive income (loss)     35,440,000 45,848,000 (9,343,000)
Ending balance     2,708,490,000 2,513,102,000 1,924,581,000
Unrealized Gains (Losses) on AFS Securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   1,874,000 37,877,000 (5,949,000) 1,874,000
Transfer of HTM securities to AFS securities         2,785,000
Other comprehensive income (loss) before reclassification     45,996,000 49,890,000 (10,711,000)
Amounts reclassified from AOCI into earnings     (9,712,000) (6,064,000) (362,000)
Other comprehensive income (loss)     36,284,000 43,826,000 (11,073,000)
Ending balance     74,161,000 37,877,000 (5,949,000)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   2,705,000 75,000 95,000 2,705,000
Transfer of HTM securities to AFS securities         (2,785,000)
Other comprehensive income (loss) before reclassification     0 0 0
Amounts reclassified from AOCI into earnings     (20,000) (20,000) (408,000)
Other comprehensive income (loss)     (20,000) (20,000) (408,000)
Ending balance     55,000 75,000 95,000
Change in Fair Value of Cash Flow Hedges          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   (4,361,000) (782,000) (3,393,000) (4,361,000)
Transfer of HTM securities to AFS securities         0
Other comprehensive income (loss) before reclassification     (699,000) (5,103,000) 1,087,000
Amounts reclassified from AOCI into earnings     1,481,000 7,714,000 975,000
Other comprehensive income (loss)     782,000 2,611,000 2,062,000
Ending balance       (782,000) (3,393,000)
Unrealized Gains (Losses) on BOLI          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   (1,102,000) (1,595,000) (1,026,000) (1,102,000)
Transfer of HTM securities to AFS securities         0
Other comprehensive income (loss) before reclassification     (2,098,000) (646,000) 0
Amounts reclassified from AOCI into earnings     492,000 77,000 76,000
Other comprehensive income (loss)     (1,606,000) (569,000) 76,000
Ending balance     (3,201,000) (1,595,000) (1,026,000)
Accumulated Other Comprehensive Income (Loss)          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance   (884,000) 35,575,000 (10,273,000) (884,000)
Transfer of HTM securities to AFS securities         0
Other comprehensive income (loss) before reclassification     43,199,000 44,141,000 (9,624,000)
Amounts reclassified from AOCI into earnings     (7,759,000) 1,707,000 281,000
Other comprehensive income (loss)     35,440,000 45,848,000 (9,343,000)
Ending balance     71,015,000 35,575,000 (10,273,000)
Accounting Standards Update 2018-02          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Amounts reclassified from AOCI into earnings $ 107,000        
Accounting Standards Update 2016-01          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Amounts reclassified from AOCI into earnings   $ 61,000      
Cumulative Effect, Period of Adoption, Adjustment          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance     (1,133,000) (416,000)  
Ending balance     $ (39,053,000) (1,133,000) (416,000)
Cumulative Effect, Period of Adoption, Adjustment | Unrealized Gains (Losses) on AFS Securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance       465,000  
Ending balance         465,000
Cumulative Effect, Period of Adoption, Adjustment | Unrealized Gains (Losses) for AFS Securities Transferred to HTM          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance       583,000  
Ending balance         583,000
Cumulative Effect, Period of Adoption, Adjustment | Change in Fair Value of Cash Flow Hedges          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance       (1,094,000)  
Ending balance         (1,094,000)
Cumulative Effect, Period of Adoption, Adjustment | Unrealized Gains (Losses) on BOLI          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance       0  
Ending balance         0
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss)          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance       $ (46,000)  
Ending balance         $ (46,000)