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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 2,424,470 $ 2,440,236 $ 2,372,737 $ 2,391,476 $ 2,498,335 $ 2,710,071 $ 2,372,737 $ 2,710,071
Other comprehensive (loss) income: (67,039) (48,934) 56,353 (145,836) (124,800) (210,118) (59,620) (480,754)
Ending balance 2,388,801 2,424,470 2,440,236 2,281,150 2,391,476 2,498,335 2,388,801 2,281,150
Unrealized Gains (Losses) on AFS Securities                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (353,811)   (363,919) (277,577)   22,763 (363,919) 22,763
Other comprehensive loss before reclassification (79,193)     (121,841)     (79,669) (422,183)
Amounts reclassified from AOCI into earnings 21,799     0     32,383 2
Other comprehensive (loss) income: (57,394)     (121,841)     (47,286) (422,181)
Ending balance (411,205) (353,811)   (399,418) (277,577)   (411,205) (399,418)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 12   17 25   35 17 35
Other comprehensive loss before reclassification 0     0     0 0
Amounts reclassified from AOCI into earnings (2)     (4)     (7) (14)
Other comprehensive (loss) income: (2)     (4)     (7) (14)
Ending balance 10 12   21 25   10 21
Change in Fair Value of Cash Flow Hedge                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (57,221)   (54,610) (36,452)   (1,567) (54,610) (1,567)
Other comprehensive loss before reclassification (9,581)     (24,142)     (12,192) (59,027)
Amounts reclassified from AOCI into earnings 0     0     0 0
Other comprehensive (loss) income: (9,581)     (24,142)     (12,192) (59,027)
Ending balance (66,802) (57,221)   (60,594) (36,452)   (66,802) (60,594)
Unrealized Gains (Losses) on BOLI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 153   226 (2,279)   (2,596) 226 (2,596)
Other comprehensive loss before reclassification 0     0     10 0
Amounts reclassified from AOCI into earnings (62)     151     (145) 468
Other comprehensive (loss) income: (62)     151     (135) 468
Ending balance 91 153   (2,128) (2,279)   91 (2,128)
AOCI Attributable to Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (410,867) (361,933) (418,286) (316,283) (191,483) 18,635 (418,286) 18,635
Other comprehensive loss before reclassification (88,774)     (145,983)     (91,851) (481,210)
Amounts reclassified from AOCI into earnings 21,735     147     32,231 456
Other comprehensive (loss) income: (67,039) (48,934) 56,353 (145,836) (124,800) (210,118) (59,620) (480,754)
Ending balance $ (477,906) $ (410,867) $ (361,933) $ (462,119) $ (316,283) $ (191,483) $ (477,906) $ (462,119)