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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Securities available for sale, amortized cost $ 498,156 $ 507,466
Securities available for sale, gross unrealized gains 193 197
Securities available for sale, gross unrealized losses 42,607 46,844
Securities available for sale, at fair value 455,742 460,819
Securities held to maturity, amortized cost 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,252 1,689
Securities held to maturity, fair value 4,748 5,311
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 87,990 95,056
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 10,444 11,193
Securities available for sale, at fair value 77,546 83,863
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 14,444 9,682
Securities available for sale, gross unrealized gains 0 20
Securities available for sale, gross unrealized losses 460 349
Securities available for sale, at fair value 13,984 9,353
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 147,673 151,143
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 12,073 13,162
Securities available for sale, at fair value 135,600 137,981
US Treasury and Government [Member]    
Securities available for sale, amortized cost 82,330 82,646
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 3,268 3,914
Securities available for sale, at fair value 79,062 78,732
Municipal Notes [Member]    
Securities available for sale, amortized cost 165,719 168,939
Securities available for sale, gross unrealized gains 193 177
Securities available for sale, gross unrealized losses 16,362 18,226
Securities available for sale, at fair value 149,550 150,890
Corporate Note Securities [Member]    
Securities held to maturity, amortized cost 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,252 1,689
Securities held to maturity, fair value $ 4,748 $ 5,311