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, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 40,367 $ 25,179
Due after one year through five years 213,662 145,276
Due after five years through ten years 273,207 223,210
Due after ten years 1,384,006 577,674
Total AFS securities 1,911,242 971,339
Estimated Fair Value    
Due in one year or less 40,342 25,326
Due after one year through five years 209,552 145,980
Due after five years through ten years 271,360 226,251
Due after ten years 1,361,887 576,665
Total AFS securities 1,883,141 974,222
Carrying Value    
Due in one year or less 0 3,221
Due after one year through five years 3,917 44,289
Due after five years through ten years 3,500 79,114
Due after ten years 227,916 73,015
Total HTM securities 235,333 199,639
Estimated Fair Value    
Due in one year or less 0 3,230
Due after one year through five years 3,889 44,601
Due after five years through ten years 3,479 80,532
Due after ten years 225,342 75,120
Total HTM securities $ 232,710 $ 203,483