SECURITIES (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost, Available for sale:
Within one year	$ 9,807
One to five years	90,205
Five to ten years	125,146
Beyond ten years	525,472
Total	750,630	$ 775,903
Estimated Fair Value, Available for sale:
Within one year	9,785
One to five years	88,221
Five to ten years	120,265
Beyond ten years	507,785
Estimated Fair Value	726,056	759,916
Amortized Cost, Held to maturity:
Within one year	2,878
One to five years	31,208
Five to ten years	55,680
Beyond ten years	86,323
Total	176,089	180,866
Estimated Fair Value, Held to maturity:
Within one year	2,873
One to five years	31,046
Five to ten years	55,269
Beyond ten years	83,689
Estimated Fair Value	$ 172,877	$ 179,885