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
Mar. 31, 2026
Dec. 31, 2025
AFS Securities [Abstract]    
Due in one year or less, Amortized Cost $ 88,280 $ 63,692
Due in one year or less, Estimated Fair Value 88,670 63,993
Due after one year through five years, Amortized Cost 268,750 298,683
Due after one year through five years, Estimated Fair Value 268,837 299,727
Due after five years through ten years, Amortized Cost 476,315 492,242
Due after five years through ten years, Estimated Fair Value 454,579 475,707
Due after ten years, Amortized Cost 3,500,136 3,635,381
Due after ten years, Estimated Fair Value 3,199,324 3,354,874
Total AFS securities 4,333,481 4,489,998
Total AFS securities, Estimated Fair Value 4,011,410 4,194,301
HTM Securities [Abstract]    
Due in one year or less, Carrying Value 11,727 507
Due in one year or less, Estimated Fair Value 11,779 503
Due after one year through five years, Carrying Value 13,874 18,813
Due after one year through five years, Estimated Fair Value 14,100 19,150
Due after five years through ten years, Carrying Value 240,645 222,284
Due after five years through ten years, Estimated Fair Value 231,530 216,095
Due after ten years, Carrying Value 604,042 642,612
Due after ten years, Estimated Fair Value 577,423 621,064
Total HTM Securities 870,288 884,216
Total HTM securities, Estimated Fair Value $ 834,832 $ 856,812