Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities [Abstract]    
Due in one year or less, Amortized Cost $ 25,179 $ 21,403
Due in one year or less, Estimated Fair Value 25,326 21,517
Due after one year through five years, Amortized Cost 145,276 108,198
Due after one year through five years, Estimated Fair Value 145,980 109,778
Due after five years through ten years, Amortized Cost 223,210 300,552
Due after five years through ten years, Estimated Fair Value 226,251 301,888
Due after ten years, Amortized Cost 577,674 517,444
Due after ten years, Estimated Fair Value 576,665 513,581
Total securities available for sale, Amortized Cost 971,339 947,597
Total securities available for sale, Estimated Fair Value 974,222 946,764
Held-to-maturity Securities [Abstract]    
Due in one year or less, Carrying Value 3,221 4,403
Due in one year or less, Estimated Fair Value 3,230 4,440
Due after one year through five years, Carrying Value 44,289 28,383
Due after one year through five years, Estimated Fair Value 44,601 28,763
Due after five years through ten years, Carrying Value 79,114 51,730
Due after five years through ten years, Estimated Fair Value 80,532 51,522
Due after ten years, Carrying Value 73,015 117,010
Due after ten years, Estimated Fair Value 75,120 117,590
Held-to-maturity Securities, Total 199,639 201,526
Total securities held to maturity, Estimated Fair Value $ 203,483 $ 202,315