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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
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost    
Due in one year or less $ 751 $ 0
Due after one through five years 21,701 16,877
Due after five through ten years 293,438 241,803
Due after ten years 765,023 832,641
Total debt securities with a single maturity date 1,080,913 1,091,321
Total investment securities 1,555,699 1,574,023
Fair Value    
Due in one year or less 747 0
Due after one through five years 21,387 16,577
Due after five through ten years 272,988 227,493
Due after ten years 679,051 743,522
Total debt securities with a single maturity date 974,173 987,592
Total investment securities 1,384,392 1,407,102
Amortized Cost    
Due in one year or less 20,113 7,014
Due after one through five years 109,135 118,912
Due after five through ten years 241,143 228,224
Due after ten years 1,001,110 1,040,146
Total debt securities with a single maturity date 1,371,501 1,394,296
Total investment securities 1,907,929 1,971,784
Fair Value    
Due in one year or less 19,993 7,024
Due after one through five years 106,569 115,973
Due after five through ten years 219,493 210,125
Due after ten years 843,273 877,643
Total debt securities with a single maturity date 1,189,328 1,210,765
Total investment securities 1,653,943 1,718,287
U.S. Government-sponsored mortgage-backed securities    
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 474,786 482,702
Fair Value    
U.S. Government-sponsored mortgage-backed securities 410,219 419,510
Total investment securities 410,219 419,510
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 536,428 577,488
Total investment securities 536,428 577,488
Fair Value    
U.S. Government-sponsored mortgage-backed securities 464,615 507,522
Total investment securities $ 464,615 $ 507,522