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, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]    
Due in one year or less, Amortized Cost $ 22,653 $ 25,179
Due in one year or less, Estimated Fair Value 22,789 25,326
Due after one year through five years, Amortized Cost 191,003 145,276
Due after one year through five years, Estimated Fair Value 188,999 145,980
Due after five years through ten years, Amortized Cost 218,211 223,210
Due after five years through ten years, Estimated Fair Value 217,304 226,251
Due after ten years, Amortized Cost 1,349,085 577,674
Due after ten years, Estimated Fair Value 1,345,729 576,665
Total securities available for sale, Amortized Cost 1,780,952 971,339
Total securities available for sale, Estimated Fair Value 1,774,821 974,222
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Due in one year or less, Carrying Value 0 3,221
Due in one year or less, Estimated Fair Value 0 3,230
Due after one year through five years, Carrying Value 3,893 44,289
Due after one year through five years, Estimated Fair Value 3,900 44,601
Due after five years through ten years, Carrying Value 3,480 79,114
Due after five years through ten years, Estimated Fair Value 3,507 80,532
Due after ten years, Carrying Value 484,899 73,015
Due after ten years, Estimated Fair Value 492,094 75,120
Held-to-maturity Securities, Total 492,272 199,639
Total securities held to maturity, Estimated Fair Value $ 499,501 $ 203,483