Quarterly report [Sections 13 or 15(d)]

SECURITIES AND OTHER INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details)

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SECURITIES AND OTHER INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
AFS Securities [Abstract]    
Due in one year or less, Amortized Cost $ 70,337 $ 35,954
Due in one year or less, Estimated Fair Value 70,349 35,808
Due after one year through five years, Amortized Cost 296,791 215,517
Due after one year through five years, Estimated Fair Value 297,731 215,513
Due after five years through ten years, Amortized Cost 540,107 286,487
Due after five years through ten years, Estimated Fair Value 521,978 271,443
Due after ten years, Amortized Cost 3,687,863 2,306,805
Due after ten years, Estimated Fair Value 3,377,465 1,919,402
Total AFS securities 4,595,098 2,844,763
Total AFS securities, Estimated Fair Value 4,267,523 2,442,166
HTM Securities [Abstract]    
Due in one year or less, Carrying Value 510 3,369
Due in one year or less, Estimated Fair Value 506 3,358
Due after one year through five years, Carrying Value 18,859 18,293
Due after one year through five years, Estimated Fair Value 19,278 18,547
Due after five years through ten years, Carrying Value 203,197 115,243
Due after five years through ten years, Estimated Fair Value 196,852 109,358
Due after ten years, Carrying Value 661,220 666,946
Due after ten years, Estimated Fair Value 631,463 628,072
Total HTM Securities 883,786 803,851
Total HTM securities, Estimated Fair Value $ 848,099 $ 759,335