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Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2022
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Debt securities available for sale, less than twelve months, gross unrealized losses | $ (2,591) | $ (801)
Debt securities available for sale, less than twelve months, fair value | 491,031 | 15,845
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (63,125) | (68,365)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 508,710 | 535,836
Debt Securities, Available for Sale, Gross Unrealized Losses | (65,716) | (69,166)
Debt Securities, Available for Sale, Fair Value | 999,741 | 551,681
Debt Securities held to maturity less than twelve months, gross unrealized losses | (162) | (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 9,895 | 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (82,269) | (75,474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 771,382 | 902,933
Debt Securities, Held To Maturity , Gross Unrealized Losses | (82,431) | (75,475)
Debt Securities,Held To Maturity, Fair Value | 779,735 | 903,363
US Treasury Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | (197) |
Debt securities available for sale, less than twelve months, fair value | 479,762 |
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 | (197) |
Debt Securities, Available for Sale, Fair Value | 479,762 |
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, Twelve Months or More, Gross Unrealized Losses | (25,065) | (24,718)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 368,868 | 484,267
Debt Securities, Held To Maturity , Gross Unrealized Losses | (25,065) | (24,718)
Debt Securities,Held To Maturity, Fair Value | 368,868 | 484,267
US Government Agencies Debt Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | 0 |
Debt securities available for sale, less than twelve months, fair value | 0 |
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 | 0 |
Debt Securities, Available for Sale, Fair Value | 0 |
Collateralized Mortgage-Backed Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | (2) | (6)
Debt securities available for sale, less than twelve months, fair value | 161 | 704
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (26,674) | (25,973)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 205,195 | 214,393
Debt Securities, Available for Sale, Gross Unrealized Losses | (26,677) | (25,979)
Debt Securities, Available for Sale, Fair Value | 205,356 | 215,097
Debt Securities held to maturity less than twelve months, gross unrealized losses | (162) | (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 9,895 | 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (56,471) | (50,024)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 393,887 | 411,585
Debt Securities, Held To Maturity , Gross Unrealized Losses | (56,634) | (50,025)
Debt Securities,Held To Maturity, Fair Value | 405,323 | 412,015
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 | (1,186) | (1,178)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 9,512 | 9,777
Debt Securities, Available for Sale, Gross Unrealized Losses | (1,186) | (1,178)
Debt Securities, Available for Sale, Fair Value | 9,512 | 9,777
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, Twelve Months or More, Gross Unrealized Losses | (733) | (732)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 7,086 | 7,081
Debt Securities, Held To Maturity , Gross Unrealized Losses | (733) | (732)
Debt Securities,Held To Maturity, Fair Value | 7,086 | 7,081
Corporate Debt Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | (2,392) | (794)
Debt securities available for sale, less than twelve months, fair value | 11,108 | 15,141
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (35,265) | (41,214)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 294,003 | 311,666
Debt Securities, Available for Sale, Gross Unrealized Losses | (37,657) | (42,009)
Debt Securities, Available for Sale, Fair Value | $ 305,111 | $ 326,807

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