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Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt securities available for sale, less than twelve months, gross unrealized losses | $ (801) | $ (22,258)
Debt securities available for sale, less than twelve months, fair value | 15,845 | 372,749
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (68,365) | (40,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 535,836 | 260,400
Debt Securities, Available for Sale, Gross Unrealized Losses | (69,166) | (62,567)
Debt Securities, Available for Sale, Fair Value | 551,681 | 633,149
Debt Securities held to maturity less than twelve months, gross unrealized losses | (1) | (44,573)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 430 | 578,572
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (75,474) | (53,603)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 902,933 | 352,742
Debt Securities, Held To Maturity , Gross Unrealized Losses | (75,475) | (98,175)
Debt Securities,Held To Maturity, Fair Value | 903,363 | 931,314
Collateralized Mortgage-Backed Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | (6) | (3,473)
Debt securities available for sale, less than twelve months, fair value | 704 | 60,234
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (25,973) | (29,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 214,393 | 189,109
Debt Securities, Available for Sale, Gross Unrealized Losses | (25,979) | (32,782)
Debt Securities, Available for Sale, Fair Value | 215,097 | 249,343
Debt Securities held to maturity less than twelve months, gross unrealized losses | (1) | (31,367)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 430 | 278,746
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (50,024) | (29,592)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 411,585 | 174,842
Debt Securities, Held To Maturity , Gross Unrealized Losses | (50,025) | (60,960)
Debt Securities,Held To Maturity, Fair Value | 412,015 | 453,588
US States and Political Subdivisions Debt Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | 0 | (186)
Debt securities available for sale, less than twelve months, fair value | 0 | 5,283
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (1,178) | (1,411)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 9,777 | 7,880
Debt Securities, Available for Sale, Gross Unrealized Losses | (1,178) | (1,597)
Debt Securities, Available for Sale, Fair Value | 9,777 | 13,163
Debt Securities held to maturity less than twelve months, gross unrealized losses | 0 | (544)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 0 | 4,443
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (732) | (474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 7,081 | 2,330
Debt Securities, Held To Maturity , Gross Unrealized Losses | (732) | (1,018)
Debt Securities,Held To Maturity, Fair Value | 7,081 | 6,773
Corporate Debt Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses | (794) | (18,566)
Debt securities available for sale, less than twelve months, fair value | 15,141 | 304,254
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses | (41,214) | (9,589)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value | 311,666 | 63,411
Debt Securities, Available for Sale, Gross Unrealized Losses | (42,009) | (28,155)
Debt Securities, Available for Sale, Fair Value | 326,807 | 367,666
US Treasury Securities [Member] |  |
Debt securities available for sale, less than twelve months, gross unrealized losses |  | (33)
Debt securities available for sale, less than twelve months, fair value |  | 2,969
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 |  | (33)
Debt Securities, Available for Sale, Fair Value |  | 2,969
Debt Securities held to maturity less than twelve months, gross unrealized losses | 0 | (12,662)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value | 0 | 295,383
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses | (24,718) | (23,537)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value | 484,267 | 175,570
Debt Securities, Held To Maturity , Gross Unrealized Losses | (24,718) | (36,197)
Debt Securities,Held To Maturity, Fair Value | $ 484,267 | 470,953
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 |  | 9
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 |  | $ 9

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