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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Amortized Cost    
Due in one year or less $ 748 $ 0
Due after one through five years 23,922 16,877
Due after five through ten years 329,137 241,803
Due after ten years 719,065 832,641
Total debt securities with a single maturity date 1,072,872 1,091,321
Total investment securities 1,542,274 1,574,023
Fair Value    
Due in one year or less 741 0
Due after one through five years 22,675 16,577
Due after five through ten years 277,575 227,493
Due after ten years 564,510 743,522
Total debt securities with a single maturity date 865,501 987,592
Total investment securities 1,251,540 1,407,102
Amortized Cost    
Due in one year or less 35,613 7,014
Due after one through five years 120,348 118,912
Due after five through ten years 265,174 228,224
Due after ten years 931,254 1,040,146
Total debt securities with a single maturity date 1,352,389 1,394,296
Total investment securities 1,873,196 1,971,784
Fair Value    
Due in one year or less 34,981 7,024
Due after one through five years 112,583 115,973
Due after five through ten years 216,934 210,125
Due after ten years 697,833 877,643
Total debt securities with a single maturity date 1,062,331 1,210,765
Total investment securities 1,495,477 1,718,287
U.S. Government-sponsored mortgage-backed securities    
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 469,402 482,702
Fair Value    
U.S. Government-sponsored mortgage-backed securities 386,039 419,510
Total investment securities 386,039 419,510
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 520,807 577,488
Total investment securities 520,807 577,488
Fair Value    
U.S. Government-sponsored mortgage-backed securities 433,146 507,522
Total investment securities $ 433,146 $ 507,522