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
Jun. 30, 2026
Dec. 31, 2025
Investment securities available for sale, amortized cost, 1 year or less $ 179,617 $ 199,254
Investment securities available for sale, fair value, 1 year or less 178,159 198,573
Investment securities held to maturity, amortized cost, 1 year or less 91,670 33,326
Investment securities held to maturity, fair value, 1 year or less 91,531 33,302
Investment securities available for sale, amortized cost, over 1 to 5 years 1,521,309 1,231,338
Investment securities available for sale, fair value, over 1 to 5 years 1,430,382 1,182,101
Investment securities held to maturity, amortized cost, over 1 to 5 years 375,858 425,387
Investment securities held to maturity, fair value, over 1 to 5 years 373,005 428,326
Investment securities available for sale, amortized cost, over 5 to 10 years 566,009 838,304
Investment securities available for sale, fair value, over 5 to 10 years 524,504 771,540
Investment securities held to maturity, amortized cost, over 5 to 10 years 282,117 317,128
Investment securities held to maturity, fair value, over 5 to 10 years 270,149 309,423
Investment securities available for sale, amortized cost, subtotal 2,266,935 2,268,896
Investment securities available for sale, fair value, subtotal 2,133,045 2,152,214
Investment securities held to maturity, amortized cost, subtotal 749,645 775,841
Investment securities held to maturity, fair value, subtotal 734,685 771,051
Debt securities available for sale, amortized cost 3,806,125 3,598,126
Debt securities available for sale 3,639,177 3,468,734
Debt securities held to maturity, amortized cost 807,847 819,575
Deb Securities, Held-to-maturity, Excluding Accrued Interest, Fair Value 790,440 812,580
Collateralized Debt Obligations [Member]    
Debt securities available for sale, amortized cost, without single date maturity 208,278 425,465
Debt securities available for sale, without single date maturity 208,302 424,614
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 208,278 425,465
Debt securities available for sale 208,302 424,614
Agency Residential MBS [Member]    
Debt securities available for sale, amortized cost, without single date maturity 178,726 194,394
Debt securities available for sale, without single date maturity 167,015 184,346
Debt securities held to maturity, amortized cost, without single date maturity 38,873 43,734
Debt securities held to maturity, fair value, without single date maturity 36,504 41,529
Debt securities available for sale, amortized cost 178,726 194,394
Debt securities available for sale 167,015 184,346
Debt securities held to maturity, amortized cost 38,873 43,734
Deb Securities, Held-to-maturity, Excluding Accrued Interest, Fair Value 36,504 41,529
Agency Commercial MBS [Member]    
Debt securities available for sale, amortized cost, without single date maturity 1,152,186 709,371
Debt securities available for sale, without single date maturity 1,130,815 707,560
Debt securities held to maturity, amortized cost, without single date maturity 19,329 0
Debt securities held to maturity, fair value, without single date maturity 19,251 0
Debt securities available for sale, amortized cost 1,152,186 709,371
Debt securities available for sale 1,130,815 $ 707,560
Debt securities held to maturity, amortized cost 19,329  
Deb Securities, Held-to-maturity, Excluding Accrued Interest, Fair Value $ 19,251