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INVESTMENT SECURITIES - Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Available-for-Sale, Amortized Cost    
Within one year $ 93,132 $ 46,226
After one year but within five years 343,295 219,281
After five years but within ten years 611,063 471,231
After ten years 3,325,891 3,300,962
Amortized Cost 4,373,381 4,037,700
Available for Sale, Fair Value    
Within one year 92,369 45,836
After one year but within five years 319,066 208,380
After five years but within ten years 525,963 422,496
After ten years 2,753,719 2,865,534
Fair value 3,691,117 3,542,246
Held to Maturity, Amortized Cost    
Within one year 3,475 1,920
After one year but within five years 20,046 21,180
After five years but within ten years 79,989 69,374
After ten years 822,217 875,862
Amortized cost 925,727 968,336
Held to Maturity, Fair Value    
Within one year 3,440 1,918
After one year but within five years 19,379 21,166
After five years but within ten years 75,245 69,851
After ten years 672,415 786,131
Fair value $ 770,479 $ 879,066