v3.26.3
CHANGE IN ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 2,738,545  
Other comprehensive income (loss) $ (124,604) $ 44,166 (142,543) $ 140,571
Amounts reclassified from accumulated other comprehensive loss (6,638) 3,301 (9,376) 9,617
Total other comprehensive (loss) income (131,242) 47,467 (151,919) 150,188
Ending balance 2,613,043   2,613,043  
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (466,224) (522,156) (445,547) (624,877)
Total other comprehensive (loss) income (131,242) 47,467 (151,919) 150,188
Ending balance (597,466) (474,689) (597,466) (474,689)
Net change in investment securities available-for-sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (393,925) (445,064) (376,545) (537,789)
Other comprehensive income (loss) (124,595) 44,395 (141,975) 137,120
Amounts reclassified from accumulated other comprehensive loss 0 0 0 0
Total other comprehensive (loss) income (124,595) 44,395 (141,975) 137,120
Ending balance (518,520) (400,669) (518,520) (400,669)
Net change in investment securities held-to-maturity        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (57,638) (69,950) (63,409) (76,405)
Other comprehensive income (loss) 0 0 0 0
Amounts reclassified from accumulated other comprehensive loss 3,028 3,370 8,799 9,825
Total other comprehensive (loss) income 3,028 3,370 8,799 9,825
Ending balance (54,610) (66,580) (54,610) (66,580)
Net change in defined benefit plan        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3,187) (3,937) (2,524) (3,815)
Other comprehensive income (loss) 0 7 (487) 24
Amounts reclassified from accumulated other comprehensive loss (87) (69) (263) (208)
Total other comprehensive (loss) income (87) (62) (750) (184)
Ending balance (3,274) (3,999) (3,274) (3,999)
Net change in fair value of derivatives used for cash flow hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (11,123) (2,982) (2,790) (7,297)
Other comprehensive income (loss) 0 (215) 0 4,100
Amounts reclassified from accumulated other comprehensive loss (9,579) 0 (17,912) 0
Total other comprehensive (loss) income (9,579) (215) (17,912) 4,100
Ending balance (20,702) (3,197) (20,702) (3,197)
Net change in equity method investments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (351) (223) (279) 429
Other comprehensive income (loss) (9) (21) (81) (673)
Amounts reclassified from accumulated other comprehensive loss 0 0 0 0
Total other comprehensive (loss) income (9) (21) (81) (673)
Ending balance $ (360) $ (244) $ (360) $ (244)