Quarterly report [Sections 13 or 15(d)]

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

v3.25.3
Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt securities available for sale, less than twelve months, gross unrealized losses $ 935 $ 1,758
Debt securities available for sale, less than twelve months, fair value 21,887 276,720
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 12,805 44,570
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 206,625 472,739
Debt Securities, Available for Sale, Gross Unrealized Losses 13,739 46,328
Debt Securities, Available for Sale, Fair Value 228,512 749,459
Debt securities held to maturity, less than twelve months, gross unrealized losses 53 536
Debt securities held to maturity, less than twelve months, fair value 3,077 40,115
Debt securities held to maturity, more than twelve months, gross unrealized losses 49,179 74,835
Debt securities held to maturity, more than twelve months, fair value 575,759 593,233
Debt securities held to maturity, gross unrealized losses 49,232 75,371
Debt securities held to maturity, fair value 578,835 633,348
Total (49,232) (75,371)
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (0) 6
Debt securities available for sale, less than twelve months, fair value 0 577
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 990 24,204
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 25,182 179,178
Debt Securities, Available for Sale, Gross Unrealized Losses 990 24,210
Debt Securities, Available for Sale, Fair Value 25,182 179,755
Debt securities held to maturity, less than twelve months, gross unrealized losses (0) 536
Debt securities held to maturity, less than twelve months, fair value 146 40,115
Debt securities held to maturity, more than twelve months, gross unrealized losses 37,440 54,614
Debt securities held to maturity, more than twelve months, fair value 333,063 356,215
Debt securities held to maturity, gross unrealized losses 37,440 55,150
Debt securities held to maturity, fair value 333,209 396,330
Total (37,440) (55,150)
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 630 1,000
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,290 9,072
Debt Securities, Available for Sale, Gross Unrealized Losses 630 1,000
Debt Securities, Available for Sale, Fair Value 9,290 9,072
Debt securities held to maturity, less than twelve months, gross unrealized losses 53 (0)
Debt securities held to maturity, less than twelve months, fair value 2,931 0
Debt securities held to maturity, more than twelve months, gross unrealized losses 304 589
Debt securities held to maturity, more than twelve months, fair value 4,565 7,247
Debt securities held to maturity, gross unrealized losses 357 589
Debt securities held to maturity, fair value 7,496 7,247
Total (357) (589)
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 935 1,307
Debt securities available for sale, less than twelve months, fair value 21,887 25,596
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 11,185 19,366
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 172,153 284,489
Debt Securities, Available for Sale, Gross Unrealized Losses 12,119 20,673
Debt Securities, Available for Sale, Fair Value 194,040 310,085
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses   445
Debt securities available for sale, less than twelve months, fair value   250,547
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   445
Debt Securities, Available for Sale, Fair Value   250,547
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 11,435 19,632
Debt securities held to maturity, more than twelve months, fair value 238,131 229,771
Debt securities held to maturity, gross unrealized losses 11,435 19,632
Debt securities held to maturity, fair value 238,130 229,771
Total $ (11,435) $ (19,632)