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
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Jun. 30, 2015
Dec. 31, 2016
Amortized Cost      
Due in one year or less $ 24,906   $ 21,403
Due after one year through five years 113,890   108,198
Due after five years through ten years 284,017   300,552
Due after ten years 525,964   517,444
Total securities available for sale 948,777   947,597
Estimated Fair Value      
Due in one year or less 24,989   21,517
Due after one year through five years 115,757   109,778
Due after five years through ten years 286,918   301,888
Due after ten years 525,394   513,581
Total securities available for sale 953,058   946,764
Carrying Value      
Due in one year or less 4,108   4,403
Due after one year through five years 30,050   28,383
Due after five years through ten years 62,127   51,730
Due after ten years 107,193   117,010
Total securities held to maturity 203,478   201,526
Estimated Fair Value      
Due in one year or less 4,140   4,440
Due after one year through five years 30,503   28,763
Due after five years through ten years 62,485   51,522
Due after ten years 108,483   117,590
Total securities held to maturity 205,611   202,315
Held to maturity securities unrealized gains before tax $ 4,800 $ 8,100 $ 5,200