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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available for sale, continuous unrealized loss position, less than 12 months $ 10,962 $ 2,729
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 7 14
Securities available for sale, continuous unrealized loss position, 12 months or more 533,184 546,018
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 49,558 66,098
Securities available for sale, continuous unrealized loss position 544,146 548,747
Securities available for sale, continuous unrealized loss position, unrealized loss 49,565 66,112
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 10,962 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 7 0
Securities available for sale, continuous unrealized loss position, 12 months or more 383,485 390,496
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 37,500 52,000
Securities available for sale, continuous unrealized loss position 394,447 390,496
Securities available for sale, continuous unrealized loss position, unrealized loss 37,507 52,000
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 114
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position, 12 months or more 26,969 28,749
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 4,964 5,715
Securities available for sale, continuous unrealized loss position 26,969 28,863
Securities available for sale, continuous unrealized loss position, unrealized loss 4,964 5,715
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 1,109
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 6
Securities available for sale, continuous unrealized loss position, 12 months or more 101,811 106,171
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 5,259 6,184
Securities available for sale, continuous unrealized loss position 101,811 107,280
Securities available for sale, continuous unrealized loss position, unrealized loss 5,259 6,190
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 1,506
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 8
Securities available for sale, continuous unrealized loss position, 12 months or more 20,919 20,602
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,835 2,199
Securities available for sale, continuous unrealized loss position 20,919 22,108
Securities available for sale, continuous unrealized loss position, unrealized loss 1,835 2,207
Other Debt and Equity Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position, 12 months or more 0 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position 0 0
Securities available for sale, continuous unrealized loss position, unrealized loss $ 0 $ 0