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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 2,440,236 $ 2,372,737 $ 2,498,335 $ 2,710,071 $ 2,372,737 $ 2,710,071
Other comprehensive (loss) income: (48,934) 56,353 (124,800) (210,118) 7,419 (334,918)
Ending balance 2,424,470 2,440,236 2,391,476 2,498,335 2,424,470 2,391,476
Unrealized Gains (Losses) on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (321,265) (363,919) (164,204) 22,763 (363,919) 22,763
Other comprehensive loss before reclassification (32,544)   (113,374)   (476) (300,341)
Amounts reclassified from AOCI into earnings (2)   1   10,584 1
Other comprehensive (loss) income: (32,546)   (113,373)   10,108 (300,340)
Ending balance (353,811) (321,265) (277,577) (164,204) (353,811) (277,577)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 14 17 30 35 17 35
Other comprehensive loss before reclassification 0   0   0 0
Amounts reclassified from AOCI into earnings (2)   (5)   (5) (10)
Other comprehensive (loss) income: (2)   (5)   (5) (10)
Ending balance 12 14 25 30 12 25
Change in Fair Value of Cash Flow Hedge            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (40,896) (54,610) (24,880) (1,567) (54,610) (1,567)
Other comprehensive loss before reclassification (16,325)   (11,572)   (2,611) (34,885)
Amounts reclassified from AOCI into earnings 0   0   0 0
Other comprehensive (loss) income: (16,325)   (11,572)   (2,611) (34,885)
Ending balance (57,221) (40,896) (36,452) (24,880) (57,221) (36,452)
Unrealized Gains (Losses) on BOLI            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 214 226 (2,429) (2,596) 226 (2,596)
Other comprehensive loss before reclassification 0   0   10 0
Amounts reclassified from AOCI into earnings (61)   150   (83) 317
Other comprehensive (loss) income: (61)   150   (73) 317
Ending balance 153 214 (2,279) (2,429) 153 (2,279)
AOCI Attributable to Parent            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (361,933) (418,286) (191,483) 18,635 (418,286) 18,635
Other comprehensive loss before reclassification (48,869)   (124,946)   (3,077) (335,226)
Amounts reclassified from AOCI into earnings (65)   146   10,496 308
Other comprehensive (loss) income: (48,934) 56,353 (124,800) (210,118) 7,419 (334,918)
Ending balance $ (410,867) $ (361,933) $ (316,283) $ (191,483) $ (410,867) $ (316,283)