Quarterly report [Sections 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, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 4,832,639 $ 3,185,216 $ 3,142,879 $ 3,043,686 $ 2,548,928 $ 2,556,327 $ 3,142,879 $ 2,556,327
Net current period other comprehensive (loss) income 37,678 12,929 25,971 90,280 (8,289) (30,949) 76,578 51,042
Ending balance 4,917,058 4,832,639 3,185,216 3,182,416 3,043,686 2,548,928 4,917,058 3,182,416
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (294,373)   (317,142) (330,804)   (302,532) (317,142) (302,532)
Other comprehensive income (loss) before reclassification 35,020     66,856     57,721 33,438
Amounts reclassified from AOCI into earnings (3)     (3)     65 5,143
Net current period other comprehensive (loss) income 35,017     66,853     57,786 38,581
Ending balance (259,356) (294,373)   (263,951) (330,804)   (259,356) (263,951)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 0   0 1   6 0 6
Other comprehensive income (loss) before reclassification 0     0     0 0
Amounts reclassified from AOCI into earnings 0     0     0 (5)
Net current period other comprehensive (loss) income 0     0     0 (5)
Ending balance 0 0   1 1   0 1
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (26,540)   (43,078) (52,775)   (42,165) (43,078) (42,165)
Other comprehensive income (loss) before reclassification 2,863     23,589     19,401 12,979
Amounts reclassified from AOCI into earnings 0     0     0 0
Net current period other comprehensive (loss) income 2,863     23,589     19,401 12,979
Ending balance (23,677) (26,540)   (29,186) (52,775)   (23,677) (29,186)
Unrealized Gains (Losses) on BOLI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 127   534 991   1,342 534 1,342
Other comprehensive income (loss) before reclassification 0     0     (10) (16)
Amounts reclassified from AOCI into earnings (202)     (162)     (599) (497)
Net current period other comprehensive (loss) income (202)     (162)     (609) (513)
Ending balance (75) 127   829 991   (75) 829
AOCI Attributable to Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (320,786) (333,715) (359,686) (382,587) (374,298) (343,349) (359,686) (343,349)
Other comprehensive income (loss) before reclassification 37,883     90,445     77,112 46,401
Amounts reclassified from AOCI into earnings (205)     (165)     (534) 4,641
Net current period other comprehensive (loss) income 37,678 12,929 25,971 90,280 (8,289) (30,949) 76,578 51,042
Ending balance $ (283,108) $ (320,786) $ (333,715) $ (292,307) $ (382,587) $ (374,298) $ (283,108) $ (292,307)