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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Securities available for sale, continuous unrealized loss position, less than 12 months $ 180,363 $ 2,729
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 3,525 14
Securities available for sale, continuous unrealized loss position, 12 months or more 500,054 546,018
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 60,282 66,098
Securities available for sale, continuous unrealized loss position 680,417 548,747
Securities available for sale, continuous unrealized loss position, unrealized loss 63,807 66,112
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 113,942 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 2,379 0
Securities available for sale, continuous unrealized loss position, 12 months or more 361,171 390,496
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 44,847 52,000
Securities available for sale, continuous unrealized loss position 475,113 390,496
Securities available for sale, continuous unrealized loss position, unrealized loss 47,226 52,000
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 194 114
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 1 0
Securities available for sale, continuous unrealized loss position, 12 months or more 24,865 28,749
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 6,331 5,715
Securities available for sale, continuous unrealized loss position 25,059 28,863
Securities available for sale, continuous unrealized loss position, unrealized loss 6,332 5,715
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 63,387 1,109
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 1,117 6
Securities available for sale, continuous unrealized loss position, 12 months or more 92,153 106,171
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 6,710 6,184
Securities available for sale, continuous unrealized loss position 155,540 107,280
Securities available for sale, continuous unrealized loss position, unrealized loss 7,827 6,190
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 2,840 1,506
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 28 8
Securities available for sale, continuous unrealized loss position, 12 months or more 21,865 20,602
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 2,394 2,199
Securities available for sale, continuous unrealized loss position 24,705 22,108
Securities available for sale, continuous unrealized loss position, unrealized loss 2,422 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