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, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 2,708,490 $ 2,513,102
Other comprehensive income (loss) (34,514) 12,754
Ending balance 2,709,732 2,425,450
Unrealized Gains (Losses) on AFS Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 74,161 37,877
Other comprehensive income (loss) before reclassification (33,125) 14,687
Amounts reclassified from AOCI into earnings (62) (1,529)
Other comprehensive income (loss) (33,187) 13,158
Ending balance 40,974 51,035
Unrealized Gains (Losses) for AFS Securities Transferred to HTM    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 55 75
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from AOCI into earnings (5) (5)
Other comprehensive income (loss) (5) (5)
Ending balance 50 70
Change in Fair Value of Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0 (782)
Other comprehensive income (loss) before reclassification (1,428) (699)
Amounts reclassified from AOCI into earnings (47) 1,481
Other comprehensive income (loss) (1,475) 782
Ending balance (1,475) 0
Unrealized Gains (Losses) on BOLI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (3,201) (1,595)
Other comprehensive income (loss) before reclassification 0 (1,289)
Amounts reclassified from AOCI into earnings 153 108
Other comprehensive income (loss) 153 (1,181)
Ending balance (3,048) (2,776)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 71,015 35,575
Other comprehensive income (loss) before reclassification (34,553) 12,699
Amounts reclassified from AOCI into earnings 39 55
Other comprehensive income (loss) (34,514) 12,754
Ending balance $ 36,501 48,329
Cumulative Effect, Period of Adoption, Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Ending balance   $ (39,053)