NOTE 2 - INVESTMENT SECURITIES - Summary of the fair value of investment securities pledged (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Aug. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged securities held to maturity, at amortized cost	$ 951,916	$ 948,676
Assets pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	346,763	354,550
Pledged securities held to maturity, at amortized cost	175,841	176,632	$ 200,300
Assets pledged as collateral | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	186,221	189,898
Assets pledged as collateral | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	3,179	3,323
Assets pledged as collateral | Other borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	157,363	161,329
Assets pledged as collateral | U.S. govt. sponsored agency securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	12,484	12,606
Assets pledged as collateral | U.S. govt. sponsored agency securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	11,210	11,268
Assets pledged as collateral | U.S. govt. sponsored agency securities | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	1,274	1,338
Assets pledged as collateral | Residential mortgage-backed and related securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	38,221	38,550
Assets pledged as collateral | Residential mortgage-backed and related securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	36,316	36,565
Assets pledged as collateral | Residential mortgage-backed and related securities | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	1,905	1,985
Assets pledged as collateral | Municipal securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	296,058	303,394
Assets pledged as collateral | Municipal securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	138,695	142,065
Assets pledged as collateral | Municipal securities | Other borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security Owned and Pledged as Collateral, Fair Value	$ 157,363	$ 161,329