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, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 3,043,686 $ 2,548,928 $ 2,556,327 $ 2,424,470 $ 2,440,236 $ 2,372,737 $ 2,556,327 $ 2,372,737
Net current period other comprehensive income (loss) 90,280 (8,289) (30,949) (67,039) (48,934) 56,353 51,042 (59,620)
Ending balance 3,182,416 3,043,686 2,548,928 2,388,801 2,424,470 2,440,236 3,182,416 2,388,801
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (330,804)   (302,532) (353,811)   (363,919) (302,532) (363,919)
Other comprehensive income (loss) before reclassification 66,856     (79,193)     33,438 (79,669)
Amounts reclassified from AOCI into earnings (3)     21,799     5,143 32,383
Net current period other comprehensive income (loss) 66,853     (57,394)     38,581 (47,286)
Ending balance (263,951) (330,804)   (411,205) (353,811)   (263,951) (411,205)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 1   6 12   17 6 17
Other comprehensive income (loss) before reclassification 0     0     0 0
Amounts reclassified from AOCI into earnings 0     (2)     (5) (7)
Net current period other comprehensive income (loss) 0     (2)     (5) (7)
Ending balance 1 1   10 12   1 10
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (52,775)   (42,165) (57,221)   (54,610) (42,165) (54,610)
Other comprehensive income (loss) before reclassification 23,589     (9,581)     12,979 (12,192)
Amounts reclassified from AOCI into earnings 0     0     0 0
Net current period other comprehensive income (loss) 23,589     (9,581)     12,979 (12,192)
Ending balance (29,186) (52,775)   (66,802) (57,221)   (29,186) (66,802)
Unrealized Gains (Losses) on BOLI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 991   1,342 153   226 1,342 226
Other comprehensive income (loss) before reclassification 0     0     (16) 10
Amounts reclassified from AOCI into earnings (162)     (62)     (497) (145)
Net current period other comprehensive income (loss) (162)     (62)     (513) (135)
Ending balance 829 991   91 153   829 91
AOCI Attributable to Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (382,587) (374,298) (343,349) (410,867) (361,933) (418,286) (343,349) (418,286)
Other comprehensive income (loss) before reclassification 90,445     (88,774)     46,401 (91,851)
Amounts reclassified from AOCI into earnings (165)     21,735     4,641 32,231
Net current period other comprehensive income (loss) 90,280 (8,289) (30,949) (67,039) (48,934) 56,353 51,042 (59,620)
Ending balance $ (292,307) $ (382,587) $ (374,298) $ (477,906) $ (410,867) $ (361,933) $ (292,307) $ (477,906)