Quarterly report pursuant to Section 13 or 15(d)

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

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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
AFS Securities [Abstract]    
Due in one year or less, Amortized Cost $ 11,823 $ 19,875
Due in one year or less, Estimated Fair Value 11,927 19,997
Due after one year through five years, Amortized Cost 175,393 161,448
Due after one year through five years, Estimated Fair Value 180,836 169,103
Due after five years through ten years, Amortized Cost 316,877 235,021
Due after five years through ten years, Estimated Fair Value 325,440 242,791
Due after ten years, Amortized Cost 2,646,163 2,022,903
Due after ten years, Estimated Fair Value 2,676,973 2,108,528
Total AFS securities 3,150,256 2,439,247
Total AFS securities, Estimated Fair Value 3,195,176 2,540,419
HTM Securities [Abstract]    
Due in one year or less, Carrying Value 3,501 1,443
Due in one year or less, Estimated Fair Value 3,512 1,460
Due after one year through five years, Carrying Value 5,890 8,577
Due after one year through five years, Estimated Fair Value 6,142 8,893
Due after five years through ten years, Carrying Value 14,061 1,744
Due after five years through ten years, Estimated Fair Value 16,091 1,805
Due after ten years, Carrying Value 512,270 533,087
Due after ten years, Estimated Fair Value 572,707 607,607
Total HTM Securities 535,722 544,851
Total HTM securities, Estimated Fair Value $ 598,452 $ 619,765