NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 3,509
Securities held to maturity, due in one year or less, fair value	3,525
Securities held to maturity, due after one year through five years, amortized cost	32,354
Securities held to maturity, due after one year through five years, fair value	32,909
Securities held to maturity, due after five years, amortized cost	399,029
Securities held to maturity, due after five years, fair value	423,765
Securities held to maturity, amortized cost	434,892
Securities held to maturity, fair value	460,199	$ 426,545
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	7,795
Securities available for sale, Due in one year or less, fair value	7,810
Securities available for sale, due after one year through five years, amortized cost	14,010
Securities available for sale, Due after one year through five years, fair value	14,423
Securities available for sale, due after five years, amortized cost	147,081
Securities available for sale, Due after five years, fair value	150,151
Securities available for sale, single maturity, amortized cost	168,886
Securities available for sale, single maturity, fair value	172,384
Securities available for sale, amortized cost	336,863	206,962
Securities available for sale, fair value	347,196	210,695
Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	122,530
Securities available for sale, callable, fair value	125,035
Municipal securities
Securities held to maturity:
Securities held to maturity, fair value	459,150	425,495
Securities available for sale:
Securities available for sale, amortized cost	132,545	46,659
Securities available for sale, fair value	135,233	48,257
Municipal securities | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	204
Securities held to maturity, callable, fair value	203
Securities available for sale:
Securities available for sale, callable, amortized cost	118,030
Securities available for sale, callable, fair value	120,371
Asset-backed securities
Securities held to maturity:
Securities held to maturity, callable, amortized cost	39,696
Securities held to maturity, callable, fair value	40,665
Securities available for sale:
Securities available for sale, amortized cost	39,696	16,958
Securities available for sale, fair value	40,665	16,887
Residential mortgage-backed and related securities
Securities held to maturity:
Securities held to maturity, callable, amortized cost	128,281
Securities held to maturity, callable, fair value	134,147
Securities available for sale:
Securities available for sale, amortized cost	128,281	118,724
Securities available for sale, fair value	134,147	120,587
Other Securities
Securities held to maturity:
Securities held to maturity, fair value	1,049	1,050
Securities available for sale:
Securities available for sale, amortized cost	18,550	4,749
Securities available for sale, fair value	18,714	$ 4,886
Other Securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	4,500
Securities available for sale, callable, fair value	$ 4,664