NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 3,171
Securities held to maturity, due in one year or less, fair value	3,188
Securities held to maturity, due after one year through five years, amortized cost	26,563
Securities held to maturity, due after one year through five years, fair value	27,189
Securities held to maturity, due after five years, amortized cost	454,443
Securities held to maturity, due after five years, fair value	500,902
Securities held to maturity, amortized cost	484,177
Securities held to maturity, fair value	531,279	$ 521,277
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,280
Securities available for sale, Due in one year or less, fair value	1,295
Securities available for sale, due after one year through five years, amortized cost	12,409
Securities available for sale, Due after one year through five years, fair value	12,694
Securities available for sale, due after five years, amortized cost	195,939
Securities available for sale, due after five years, fair value	199,376
Securities available for sale, single maturity, amortized cost	209,628
Securities available for sale, single maturity, fair value	213,365
Securities available for sale, amortized cost	337,012	350,060
Securities available for sale, fair value	344,716	361,966
Securities available for sale, callable, amortized cost	337,012
Securities available for sale, callable, fair value	344,716
Callable Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	181,009
Securities available for sale, fair value	184,439
Municipal securities.
Securities held to maturity:
Securities held to maturity, fair value	530,229	520,227
Securities available for sale:
Securities available for sale, amortized cost	162,964	147,241
Securities available for sale, fair value	166,359	152,408
Municipal securities. | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	285,608
Securities held to maturity, callable, fair value	297,413
Securities available for sale:
Securities available for sale, callable, amortized cost	157,961
Securities available for sale, callable, fair value	161,122
Asset-backed securities
Securities available for sale:
Securities available for sale, amortized cost	29,622	39,663
Securities available for sale, fair value	30,607	40,683
Securities available for sale, callable, amortized cost	29,622
Securities available for sale, callable, fair value	30,607
Residential mortgage-backed and related securities
Securities available for sale:
Securities available for sale, amortized cost	97,762	127,670
Securities available for sale, fair value	100,744	132,842
Securities available for sale, callable, amortized cost	97,762
Securities available for sale, callable, fair value	100,744
Other Securities
Securities held to maturity:
Securities held to maturity, fair value	1,050	1,050
Securities available for sale:
Securities available for sale, amortized cost	23,048	20,550
Securities available for sale, fair value	23,317	$ 20,697
Other Securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	23,048
Securities available for sale, callable, fair value	$ 23,317