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, 2016
Dec. 31, 2015
Available-for-sale Securities [Abstract]    
Due in one year or less, Amortized Cost $ 21,403 $ 8,380
Due in one year or less, Estimated Fair Value 21,517 8,370
Due after one year through five years, Amortized Cost 108,198 65,326
Due after one year through five years, Estimated Fair Value 109,778 66,996
Due after five years through ten years, Amortized Cost 300,552 296,864
Due after five years through ten years, Estimated Fair Value 301,888 301,920
Due after ten years, Amortized Cost 517,444 520,706
Due after ten years, Estimated Fair Value 513,581 526,006
Total securities available for sale, Amortized Cost 947,597 891,276
Total securities available for sale, Estimated Fair Value 946,764 903,292
Held-to-maturity Securities [Abstract]    
Due in one year or less, Carrying Value 4,403 1,488
Due in one year or less, Estimated Fair Value 4,440 1,491
Due after one year through five years, Carrying Value 28,383 4,294
Due after one year through five years, Estimated Fair Value 28,763 4,348
Due after five years through ten years, Carrying Value 51,730 44,736
Due after five years through ten years, Estimated Fair Value 51,522 45,501
Due after ten years, Carrying Value 117,010 154,856
Due after ten years, Estimated Fair Value 117,590 158,097
Held-to-maturity Securities, Total 201,526 205,374
Total securities held to maturity, Estimated Fair Value $ 202,315 $ 209,437