Quarterly report [Sections 13 or 15(d)]

Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details)

v3.26.3
Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt securities available for sale, less than twelve months, gross unrealized losses $ 12,217 $ 984
Debt securities available for sale, less than twelve months, fair value 730,574 77,583
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 5,518 9,632
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 126,542 187,749
Debt Securities, Available for Sale, Gross Unrealized Losses 17,735 10,616
Debt Securities, Available for Sale, Fair Value 857,116 265,332
Debt securities held to maturity, less than twelve months, gross unrealized losses 1,447 34
Debt securities held to maturity, less than twelve months, fair value 35,941 2,954
Debt securities held to maturity, more than twelve months, gross unrealized losses 60,044 44,250
Debt securities held to maturity, more than twelve months, fair value 494,060 569,943
Debt securities held to maturity, gross unrealized losses 61,491 44,284
Debt securities held to maturity, fair value 530,001 572,897
Total (61,491) (44,284)
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 2,183  
Debt securities available for sale, less than twelve months, fair value 438,386  
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (0)  
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0  
Debt Securities, Available for Sale, Gross Unrealized Losses 2,183  
Debt Securities, Available for Sale, Fair Value 438,386  
Debt securities held to maturity, less than twelve months, gross unrealized losses (0) (0)
Debt securities held to maturity, less than twelve months, fair value 0 0
Debt securities held to maturity, more than twelve months, gross unrealized losses 9,348 9,589
Debt securities held to maturity, more than twelve months, fair value 215,437 240,032
Debt securities held to maturity, gross unrealized losses 9,348 9,589
Debt securities held to maturity, fair value 215,437 240,032
Total (9,348) (9,589)
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 5,921 (0)
Debt securities available for sale, less than twelve months, fair value 132,457 0
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 953 852
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 14,924 22,662
Debt Securities, Available for Sale, Gross Unrealized Losses 6,874 852
Debt Securities, Available for Sale, Fair Value 147,381 22,662
Debt securities held to maturity, less than twelve months, gross unrealized losses 1,447 (0)
Debt securities held to maturity, less than twelve months, fair value 35,941 0
Debt securities held to maturity, more than twelve months, gross unrealized losses 50,345 34,395
Debt securities held to maturity, more than twelve months, fair value 274,456 325,307
Debt securities held to maturity, gross unrealized losses 51,792 34,395
Debt securities held to maturity, fair value 310,397 325,307
Total (51,792) (34,395)
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (0) (0)
Debt securities available for sale, less than twelve months, fair value 0 0
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 625 554
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 8,786 9,363
Debt Securities, Available for Sale, Gross Unrealized Losses 625 554
Debt Securities, Available for Sale, Fair Value 8,786 9,363
Debt securities held to maturity, less than twelve months, gross unrealized losses (0) 34
Debt securities held to maturity, less than twelve months, fair value 0 2,954
Debt securities held to maturity, more than twelve months, gross unrealized losses 351 266
Debt securities held to maturity, more than twelve months, fair value 4,167 4,604
Debt securities held to maturity, gross unrealized losses 351 300
Debt securities held to maturity, fair value 4,167 7,558
Total (351) (300)
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 4,113 984
Debt securities available for sale, less than twelve months, fair value 159,731 77,583
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 3,940 8,226
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 102,832 155,724
Debt Securities, Available for Sale, Gross Unrealized Losses 8,053 9,210
Debt Securities, Available for Sale, Fair Value $ 262,563 $ 233,307