NOTE 3 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 2,946
Securities held to maturity, due in one year or less, fair value	2,954
Securities held to maturity, due after one year through five years, amortized cost	31,055
Securities held to maturity, due after one year through five years, fair value	31,689
Securities held to maturity, due after five years, amortized cost	309,476
Securities held to maturity, due after five years, fair value	328,831
Securities held to maturity, amortized cost	343,477
Securities held to maturity, fair value	363,474	$ 400,770
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,084
Securities available for sale, Due in one year or less, fair value	1,088
Securities available for sale, due after one year through five years, amortized cost	17,157
Securities available for sale, Due after one year through five years, fair value	17,384
Securities available for sale, due after five years, amortized cost	67,590
Securities available for sale, Due after five years, fair value	69,580
Securities available for sale, single maturity, amortized cost	85,831
Securities available for sale, single maturity, fair value	88,052
Securities available for sale, amortized cost	206,949	266,671
Securities available for sale, fair value	211,932	261,056
Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	46,766
Securities available for sale, callable, fair value	48,323
US States and Political Subdivisions Debt Securities
Securities held to maturity:
Securities held to maturity, fair value	362,430	399,721
Securities available for sale:
Securities available for sale, amortized cost	47,259	59,069
Securities available for sale, fair value	48,902	58,546
US States and Political Subdivisions Debt Securities | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	176,339
Securities held to maturity, callable, fair value	181,785
Securities available for sale:
Securities available for sale, callable, amortized cost	40,262
Securities available for sale, callable, fair value	41,646
Residential Mortgage Backed Securities
Securities available for sale:
Securities available for sale, amortized cost	121,118	163,698
Securities available for sale, fair value	123,880	159,249
Securities available for sale, callable, amortized cost	121,118
Securities available for sale, callable, fair value	123,880
Other Securities
Securities held to maturity:
Securities held to maturity, fair value	1,044	1,049
Securities available for sale:
Securities available for sale, amortized cost	17,711	6,754
Securities available for sale, fair value	17,882	$ 6,850
Other Securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	6,504
Securities available for sale, callable, fair value	$ 6,677