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
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 30,048 $ 25,179
Due after one year through five years 201,580 145,276
Due after five years through ten years 228,924 223,210
Due after ten years 806,653 577,674
Total securities available for sale 1,267,205 971,339
Estimated Fair Value    
Due in one year or less 30,097 25,326
Due after one year through five years 199,198 145,980
Due after five years through ten years 228,561 226,251
Due after ten years 795,323 576,665
Total securities available for sale 1,253,179 974,222
Carrying Value    
Due in one year or less 6,764 3,221
Due after one year through five years 48,016 44,289
Due after five years through ten years 78,816 79,114
Due after ten years 65,137 73,015
Total securities held to maturity 198,733 199,639
Estimated Fair Value    
Due in one year or less 6,780 3,230
Due after one year through five years 48,265 44,601
Due after five years through ten years 79,099 80,532
Due after ten years 65,760 75,120
Total securities held to maturity $ 199,904 $ 203,483