v3.26.1
Note 3 - Debt Securities Available for Sale and Held to Maturity - Schedule of Estimated Market Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investment securities available for sale, amortized cost, 1 year or less $ 204,192 $ 199,254
Investment securities available for sale, fair value, 1 year or less 203,356 198,573
Investment securities held to maturity, amortized cost, 1 year or less 60,501 33,326
Investment securities held to maturity, fair value, 1 year or less 60,400 33,302
Investment securities available for sale, amortized cost, over 1 to 5 years 1,435,262 1,231,338
Investment securities available for sale, fair value, over 1 to 5 years 1,360,107 1,182,101
Investment securities held to maturity, amortized cost, over 1 to 5 years 412,457 425,387
Investment securities held to maturity, fair value, over 1 to 5 years 410,862 428,326
Investment securities available for sale, amortized cost, over 5 to 10 years 671,976 838,304
Investment securities available for sale, fair value, over 5 to 10 years 615,983 771,540
Investment securities held to maturity, amortized cost, over 5 to 10 years 285,330 317,128
Investment securities held to maturity, fair value, over 5 to 10 years 274,059 309,423
Investment securities available for sale, amortized cost, subtotal 2,311,430 2,268,896
Investment securities available for sale, fair value, subtotal 2,179,446 2,152,214
Investment securities held to maturity, amortized cost, subtotal 758,288 775,841
Investment securities held to maturity, fair value, subtotal 745,321 771,051
Debt securities available for sale, amortized cost 3,749,144 3,598,126
Debt securities available for sale 3,596,855 3,468,734
Debt securities held to maturity, amortized cost 799,559 819,575
Deb Securities, Held-to-maturity, Excluding Accrued Interest, Fair Value 784,304 812,580
Collateralized Debt Obligations [Member]    
Debt securities available for sale, amortized cost, without single date maturity 293,927 425,465
Debt securities available for sale, without single date maturity 293,987 424,614
Debt securities held to maturity, amortized cost, without single date maturity 0 0
Debt securities held to maturity, fair value, without single date maturity 0 0
Debt securities available for sale, amortized cost 293,927 425,465
Debt securities available for sale 293,987 424,614
Agency Residential MBS [Member]    
Debt securities available for sale, amortized cost, without single date maturity 187,993 194,394
Debt securities available for sale, without single date maturity 177,308 184,346
Debt securities held to maturity, amortized cost, without single date maturity 41,271 43,734
Debt securities held to maturity, fair value, without single date maturity 38,983 41,529
Debt securities available for sale, amortized cost 187,993 194,394
Debt securities available for sale 177,308 184,346
Debt securities held to maturity, amortized cost 41,271 43,734
Deb Securities, Held-to-maturity, Excluding Accrued Interest, Fair Value 38,983 41,529
Agency Commercial MBS [Member]    
Debt securities available for sale, amortized cost, without single date maturity 955,794 709,371
Debt securities available for sale, without single date maturity 946,114 707,560
Debt securities held to maturity, amortized cost, without single date maturity 0 0
Debt securities held to maturity, fair value, without single date maturity 0 0
Debt securities available for sale, amortized cost 955,794 709,371
Debt securities available for sale $ 946,114 $ 707,560