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, 2026
Dec. 31, 2025
AFS Securities [Abstract]    
Due in one year or less, Amortized Cost $ 101,001 $ 63,692
Due in one year or less, Estimated Fair Value 100,984 63,993
Due after one year through five years, Amortized Cost 323,504 298,683
Due after one year through five years, Estimated Fair Value 319,060 299,727
Due after five years through ten years, Amortized Cost 402,291 492,242
Due after five years through ten years, Estimated Fair Value 356,498 475,707
Due after ten years, Amortized Cost 3,397,177 3,635,381
Due after ten years, Estimated Fair Value 2,972,423 3,354,874
Total AFS securities 4,223,973 4,489,998
Total AFS securities, Estimated Fair Value 3,748,965 4,194,301
HTM Securities [Abstract]    
Due in one year or less, Carrying Value 5,587 507
Due in one year or less, Estimated Fair Value 5,592 503
Due after one year through five years, Carrying Value 25,831 18,813
Due after one year through five years, Estimated Fair Value 25,706 19,150
Due after five years through ten years, Carrying Value 293,486 222,284
Due after five years through ten years, Estimated Fair Value 267,875 216,095
Due after ten years, Carrying Value 520,422 642,612
Due after ten years, Estimated Fair Value 463,073 621,064
Total HTM Securities 845,326 884,216
Total HTM securities, Estimated Fair Value $ 762,246 $ 856,812