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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Securities available for sale, continuous unrealized loss position, less than 12 months $ 341,046,000 $ 119,073,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 4,954,000 899,000
Securities available for sale, continuous unrealized loss position, 12 months or more 49,160,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,002,000 0
Securities available for sale, continuous unrealized loss position 390,206,000 119,073,000
Securities available for sale, continuous unrealized loss position, unrealized loss 5,956,000 899,000
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 274,190,000 118,650,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 3,974,000 897,000
Securities available for sale, continuous unrealized loss position, 12 months or more 48,317,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 980,000 0
Securities available for sale, continuous unrealized loss position 322,507,000 118,650,000
Securities available for sale, continuous unrealized loss position, unrealized loss 4,954,000 897,000
Collateralized Mortgage Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 23,578,000 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 544,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more 23,000 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 23,601,000 0
Securities available for sale, continuous unrealized loss position, unrealized loss 544,000 0
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 32,180,000 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 278,000 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 32,180,000 0
Securities available for sale, continuous unrealized loss position, unrealized loss 278,000 0
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 11,098,000 423,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 158,000 2,000
Securities available for sale, continuous unrealized loss position, 12 months or more 820,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 22,000 0
Securities available for sale, continuous unrealized loss position 11,918,000 423,000
Securities available for sale, continuous unrealized loss position, unrealized loss $ 180,000 $ 2,000