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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Securities available for sale, continuous unrealized loss position, less than 12 months $ 58,665 $ 180,363
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 681 3,525
Securities available for sale, continuous unrealized loss position, 12 months or more 478,716 500,054
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 40,326 60,282
Securities available for sale, continuous unrealized loss position 537,381 680,417
Securities available for sale, continuous unrealized loss position, unrealized loss 41,007 63,807
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 23,431 113,942
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 98 2,379
Securities available for sale, continuous unrealized loss position, 12 months or more 347,556 361,171
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 29,475 44,847
Securities available for sale, continuous unrealized loss position 370,987 475,113
Securities available for sale, continuous unrealized loss position, unrealized loss 29,573 47,226
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 22 194
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 1
Securities available for sale, continuous unrealized loss position, 12 months or more 23,138 24,865
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 4,866 6,331
Securities available for sale, continuous unrealized loss position 23,160 25,059
Securities available for sale, continuous unrealized loss position, unrealized loss 4,866 6,332
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 32,869 63,387
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 565 1,117
Securities available for sale, continuous unrealized loss position, 12 months or more 87,987 92,153
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 4,325 6,710
Securities available for sale, continuous unrealized loss position 120,856 155,540
Securities available for sale, continuous unrealized loss position, unrealized loss 4,890 7,827
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 2,343 2,840
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 18 28
Securities available for sale, continuous unrealized loss position, 12 months or more 20,035 21,865
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,660 2,394
Securities available for sale, continuous unrealized loss position 22,378 24,705
Securities available for sale, continuous unrealized loss position, unrealized loss 1,678 2,422
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