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 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 2,747,597 $ 2,709,732 $ 2,708,490 $ 2,618,226 $ 2,425,450 $ 2,513,102 $ 2,708,490 $ 2,513,102
Other comprehensive income (loss) (23,649) 16,571 (34,514) 1,358 12,975 12,754 (41,592) 27,087
Ending balance 2,694,439 2,747,597 2,709,732 2,660,885 2,618,226 2,425,450 2,694,439 2,660,885
Unrealized Gains (Losses) on AFS Securities                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 54,792   74,161 63,886   37,877 74,161 37,877
Other comprehensive income (loss) before reclassification (23,242)     1,250     (42,549) 36,956
Amounts reclassified from AOCI into earnings (7)     (14)     (69) (9,711)
Other comprehensive income (loss) (23,249)     1,236     (42,618) 27,245
Ending balance 31,543 54,792   65,122 63,886   31,543 65,122
Unrealized Gains (Losses) for AFS Securities Transferred to HTM                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 45   55 65   75 55 75
Other comprehensive income (loss) before reclassification 0     0     0 0
Amounts reclassified from AOCI into earnings (5)     (5)     (15) (15)
Other comprehensive income (loss) (5)     (5)     (15) (15)
Ending balance 40 45   60 65   40 60
Change in Fair Value of Cash Flow Hedge                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 1,132   0 0   (782) 0 (782)
Other comprehensive income (loss) before reclassification (545)     0     634 (699)
Amounts reclassified from AOCI into earnings 0     0     (47) 1,481
Other comprehensive income (loss) (545)     0     587 782
Ending balance 587 1,132   0 0   587 0
Unrealized Gains (Losses) on BOLI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (2,897)   (3,201) (2,647)   (1,595) (3,201) (1,595)
Other comprehensive income (loss) before reclassification 0     0     0 (1,289)
Amounts reclassified from AOCI into earnings 150     127     454 364
Other comprehensive income (loss) 150     127     454 (925)
Ending balance (2,747) (2,897)   (2,520) (2,647)   (2,747) (2,520)
AOCI Attributable to Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 53,072 36,501 71,015 61,304 48,329 35,575 71,015 35,575
Other comprehensive income (loss) before reclassification (23,787)     1,250     (41,915) 34,968
Amounts reclassified from AOCI into earnings 138     108     323 (7,881)
Other comprehensive income (loss) (23,649) 16,571 (34,514) 1,358 12,975 12,754 (41,592) 27,087
Ending balance $ 29,423 $ 53,072 $ 36,501 $ 62,662 61,304 48,329 $ 29,423 $ 62,662
Cumulative Effect, Period of Adoption, Adjustment                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance         $ (39,053)      
Ending balance           $ (39,053)