NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 3,448
Securities held to maturity, due in one year or less, fair value	3,469
Securities held to maturity, due after one year through five years, amortized cost	35,903
Securities held to maturity, due after one year through five years, fair value	36,526
Securities held to maturity, due after five years, amortized cost	386,625
Securities held to maturity, due after five years, fair value	405,073
Securities held to maturity, amortized cost	425,976
Securities held to maturity, fair value	445,068	$ 426,545
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,921
Securities available for sale, Due in one year or less, fair value	1,903
Securities available for sale, due after one year through five years, amortized cost	14,976
Securities available for sale, Due after one year through five years, fair value	15,411
Securities available for sale, due after five years, amortized cost	116,704
Securities available for sale, Due after five years, fair value	120,124
Securities available for sale, single maturity, amortized cost	133,601
Securities available for sale, single maturity, fair value	137,438
Securities available for sale, amortized cost	311,357	206,962
Securities available for sale, fair value	322,907	210,695
Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	88,511
Securities available for sale, callable, fair value	91,184
Municipal securities
Securities held to maturity:
Securities held to maturity, fair value	444,018	425,495
Securities available for sale:
Securities available for sale, amortized cost	98,388	46,659
Securities available for sale, fair value	101,266	48,257
Municipal securities | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	202,436
Securities held to maturity, callable, fair value	205,736
Securities available for sale:
Securities available for sale, callable, amortized cost	84,011
Securities available for sale, callable, fair value	86,534
Asset-backed securities
Securities held to maturity:
Securities held to maturity, callable, amortized cost	39,712
Securities held to maturity, callable, fair value	39,797
Securities available for sale:
Securities available for sale, amortized cost	39,712	16,958
Securities available for sale, fair value	39,797	16,887
Residential mortgage-backed and related securities
Securities held to maturity:
Securities held to maturity, callable, amortized cost	138,044
Securities held to maturity, callable, fair value	145,672
Securities available for sale:
Securities available for sale, amortized cost	138,044	118,724
Securities available for sale, fair value	145,672	120,587
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	18,550	4,749
Securities available for sale, fair value	18,700	$ 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	$ 4,650