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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 2,709,732 $ 2,708,490 $ 2,425,450 $ 2,513,102 $ 2,708,490 $ 2,513,102
Other comprehensive income (loss) 16,571 (34,514) 12,975 12,754 (17,943) 25,729
Ending balance 2,747,597 2,709,732 2,618,226 2,425,450 2,747,597 2,618,226
Unrealized Gains (Losses) on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 40,974 74,161 51,035 37,877 74,161 37,877
Other comprehensive income (loss) before reclassification 13,818   21,019   (19,307) 35,706
Amounts reclassified from AOCI into earnings 0   (8,168)   (62) (9,697)
Other comprehensive income (loss) 13,818   12,851   (19,369) 26,009
Ending balance 54,792 40,974 63,886 51,035 54,792 63,886
Unrealized Gains (Losses) for AFS Securities Transferred to HTM            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 50 55 70 75 55 75
Other comprehensive income (loss) before reclassification 0   0   0 0
Amounts reclassified from AOCI into earnings (5)   (5)   (10) (10)
Other comprehensive income (loss) (5)   (5)   (10) (10)
Ending balance 45 50 65 70 45 65
Change in Fair Value of Cash Flow Hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (1,475) 0 0 (782) 0 (782)
Other comprehensive income (loss) before reclassification 2,607   0   1,179 (699)
Amounts reclassified from AOCI into earnings 0   0   (47) 1,481
Other comprehensive income (loss) 2,607   0   1,132 782
Ending balance 1,132 (1,475) 0 0 1,132 0
Unrealized Gains (Losses) on BOLI            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (3,048) (3,201) (2,776) (1,595) (3,201) (1,595)
Other comprehensive income (loss) before reclassification 0   0   0 (1,289)
Amounts reclassified from AOCI into earnings 151   129   304 237
Other comprehensive income (loss) 151   129   304 (1,052)
Ending balance (2,897) (3,048) (2,647) (2,776) (2,897) (2,647)
Accumulated Other Comprehensive Income (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 36,501 71,015 48,329 35,575 71,015 35,575
Other comprehensive income (loss) before reclassification 16,425   21,019   (18,128) 33,718
Amounts reclassified from AOCI into earnings 146   (8,044)   185 (7,989)
Other comprehensive income (loss) 16,571 (34,514) 12,975 12,754 (17,943) 25,729
Ending balance $ 53,072 $ 36,501 61,304 48,329 $ 53,072 $ 61,304
Cumulative Effect, Period of Adoption, Adjustment            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance     $ (39,053)      
Ending balance       $ (39,053)