5. INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Equity securities, Amortized Cost	$ 250,290
Equity securities, Estimated Fair Value	277,269
Held-to-Maturity Amortized Cost	328
Held-to-Maturity Estimated Fair Value	328	$ 404
Equity Securities - Corporate Stock
Within one year, Amortized Cost	4,969
After one through five years, Amortized Cost	5,145
After five through ten years, Amortized Cost	12,980
After ten years, Amortized Cost	4,158
Total Amortized Cost	27,252
Within one year, Estimated Fair Value	4,963
After one through five years, Estimated Fair Value	5,109
After five through ten years, Estimated Fair Value	12,818
After ten years, Estimated Fair Value	4,089
Total Estimated Fair Value	26,979
Equity securities, Amortized Cost	256,018
Equity securities, Estimated Fair Value	283,270
US Government Agencies and Sponsored Agencies
Held-to-Maturity Amortized Cost	311	378
Held-to-Maturity Estimated Fair Value	$ 311	$ 404