NOTE 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Securities held to maturity:
Securities held to maturity, due in one year or less, amortized cost	$ 2,882
Securities held to maturity, due in one year or less, fair value	2,910
Securities held to maturity, due after one year through five years, amortized cost	29,592
Securities held to maturity, due after one year through five years, fair value	30,281
Securities held to maturity, due after five years, amortized cost	440,859
Securities held to maturity, due after five years, fair value	490,251
Securities held to maturity, amortized cost	473,333
Securities held to maturity, fair value	523,442	$ 521,277
Securities available for sale:
Securities available for sale, due in one year or less, amortized cost	1,471
Securities available for sale, Due in one year or less, fair value	1,492
Securities available for sale, due after one year through five years, amortized cost	11,927
Securities available for sale, Due after one year through five years, fair value	12,175
Securities available for sale, due after five years, amortized cost	179,658
Securities available for sale, due after five years, fair value	185,702
Securities available for sale, single maturity, amortized cost	193,056
Securities available for sale, single maturity, fair value	199,369
Securities available for sale, amortized cost	326,388	350,060
Securities available for sale, fair value	337,286	361,966
Securities available for sale, callable, amortized cost	326,388
Securities available for sale, callable, fair value	337,286
Callable Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	173,288
Securities available for sale, fair value	178,974
Municipal securities.
Securities held to maturity:
Securities held to maturity, fair value	522,392	520,227
Securities available for sale:
Securities available for sale, amortized cost	163,607	147,241
Securities available for sale, fair value	169,320	152,408
Municipal securities. | Callable Securities [Member]
Securities held to maturity:
Securities held to maturity, callable, amortized cost	272,039
Securities held to maturity, callable, fair value	283,607
Securities available for sale:
Securities available for sale, callable, amortized cost	158,149
Securities available for sale, callable, fair value	163,595
Asset-backed securities
Securities available for sale:
Securities available for sale, amortized cost	30,707	39,663
Securities available for sale, fair value	31,779	40,683
Securities available for sale, callable, amortized cost	30,707
Securities available for sale, callable, fair value	31,778
Residential mortgage-backed and related securities
Securities available for sale:
Securities available for sale, amortized cost	102,625	127,670
Securities available for sale, fair value	106,138	132,842
Securities available for sale, callable, amortized cost	102,625
Securities available for sale, callable, fair value	106,139
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	15,139	20,550
Securities available for sale, fair value	15,379	$ 20,697
Other Securities | Callable Securities [Member]
Securities available for sale:
Securities available for sale, callable, amortized cost	15,139
Securities available for sale, callable, fair value	$ 15,379