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, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 23,387 $ 21,403
Due after one year through five years 128,261 108,198
Due after five years through ten years 267,492 300,552
Due after ten years 541,706 517,444
Total securities available for sale 960,846 947,597
Estimated Fair Value    
Due in one year or less 23,510 21,517
Due after one year through five years 130,107 109,778
Due after five years through ten years 271,830 301,888
Due after ten years 542,914 513,581
Total securities available for sale 968,361 946,764
Carrying Value    
Due in one year or less 5,879 4,403
Due after one year through five years 41,196 28,383
Due after five years through ten years 65,893 51,730
Due after ten years 91,833 117,010
Total securities held to maturity 204,801 201,526
Estimated Fair Value    
Due in one year or less 5,902 4,440
Due after one year through five years 41,959 28,763
Due after five years through ten years 67,444 51,522
Due after ten years 94,530 117,590
Total securities held to maturity $ 209,835 $ 202,315