NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 2,060
Securities held to maturity, due in one year or less, fair value	2,064
Securities held to maturity, due after one year through five years, amortized cost	28,228
Securities held to maturity, due after one year through five years, fair value	28,544
Securities held to maturity, due after five years, amortized cost	365,014
Securities held to maturity, due after five years, fair value	375,763
Securities held to maturity, amortized cost	395,302
Securities held to maturity, fair value	406,371	$ 400,770
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,375
Securities available for sale, Due in one year or less, fair value	1,387
Securities available for sale, due after one year through five years, amortized cost	52,247
Securities available for sale, Due after one year through five years, fair value	51,874
Securities available for sale, due after five years, amortized cost	44,858
Securities available for sale, Due after five years, fair value	45,494
Securities available for sale, single maturity, amortized cost	98,480
Securities available for sale, single maturity, fair value	98,755
Securities available for sale, amortized cost	261,918
Securities available for sale, fair value	260,447
Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	59,313
Securities available for sale, callable, fair value	59,654
US States and Political Subdivisions Debt Securities
Securities held to maturity:
Securities held to maturity, fair value	405,322	399,721
US States and Political Subdivisions Debt Securities | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	205,929
Securities held to maturity, callable, fair value	209,592
Securities available for sale:
Securities available for sale, callable, amortized cost	47,809
Securities available for sale, callable, fair value	48,158
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	4,955
Residential Mortgage Backed Securities
Securities available for sale:
Securities available for sale, callable, amortized cost	163,438
Securities available for sale, callable, fair value	161,692
Other Securities
Securities held to maturity:
Securities held to maturity, fair value	1,049	$ 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	$ 6,541