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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Securities available for sale, continuous unrealized loss position, less than 12 months $ 193,930,000 $ 351,062,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 17,438,000 6,455,000
Securities available for sale, continuous unrealized loss position, 12 months or more 379,216,000 110,491,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 65,843,000 3,503,000
Securities available for sale, continuous unrealized loss position 573,146,000 461,553,000
Securities available for sale, continuous unrealized loss position, unrealized loss 83,281,000 9,958,000
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 53,019,000 274,287,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 5,713,000 5,274,000
Securities available for sale, continuous unrealized loss position, 12 months or more 335,725,000 110,053,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 59,379,000 3,495,000
Securities available for sale, continuous unrealized loss position 388,744,000 384,340,000
Securities available for sale, continuous unrealized loss position, unrealized loss 65,092,000 8,769,000
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 31,127,000 23,184,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 6,068,000 652,000
Securities available for sale, continuous unrealized loss position, 12 months or more 12,000 24,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position 31,139,000 23,208,000
Securities available for sale, continuous unrealized loss position, unrealized loss 6,068,000 652,000
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 97,252,000 40,748,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 4,516,000 392,000
Securities available for sale, continuous unrealized loss position, 12 months or more 32,870,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 4,542,000 0
Securities available for sale, continuous unrealized loss position 130,122,000 40,748,000
Securities available for sale, continuous unrealized loss position, unrealized loss 9,058,000 392,000
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 12,532,000 12,843,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 1,141,000 137,000
Securities available for sale, continuous unrealized loss position, 12 months or more 10,609,000 414,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,922,000 8,000
Securities available for sale, continuous unrealized loss position 23,141,000 13,257,000
Securities available for sale, continuous unrealized loss position, unrealized loss 3,063,000 145,000
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