NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 2,781
Securities held to maturity, due in one year or less, fair value	2,794
Securities held to maturity, due after one year through five years, amortized cost	32,323
Securities held to maturity, due after one year through five years, fair value	32,929
Securities held to maturity, due after five years, amortized cost	353,609
Securities held to maturity, due after five years, fair value	370,489
Securities held to maturity, amortized cost	388,713
Securities held to maturity, fair value	406,212	$ 400,770
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,624
Securities available for sale, Due in one year or less, fair value	1,633
Securities available for sale, due after one year through five years, amortized cost	27,466
Securities available for sale, Due after one year through five years, fair value	27,638
Securities available for sale, due after five years, amortized cost	65,042
Securities available for sale, Due after five years, fair value	66,591
Securities available for sale, single maturity, amortized cost	94,132
Securities available for sale, single maturity, fair value	95,862
Securities available for sale, amortized cost	251,892
Securities available for sale, fair value	255,090
Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	55,688
Securities available for sale, callable, fair value	56,850
US States and Political Subdivisions Debt Securities
Securities held to maturity:
Securities held to maturity, fair value	405,162	399,721
US States and Political Subdivisions Debt Securities | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	188,313
Securities held to maturity, callable, fair value	193,173
Securities available for sale:
Securities available for sale, callable, amortized cost	44,184
Securities available for sale, callable, fair value	45,185
U.S. govt. sponsored agency securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	4,999
Securities available for sale, callable, fair value	5,003
Residential Mortgage Backed Securities
Securities available for sale:
Securities available for sale, callable, amortized cost	157,760
Securities available for sale, callable, fair value	159,228
Other Securities
Securities held to maturity:
Securities held to maturity, fair value	1,050	$ 1,049
Other Securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	6,505
Securities available for sale, callable, fair value	$ 6,662