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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities available for sale, amortized cost $ 507,922 $ 507,466
Securities available for sale, gross unrealized gains 497 197
Securities available for sale, gross unrealized losses 38,329 46,844
Securities available for sale, at fair value 470,090 460,819
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 1,704 1,689
Securities held to maturity, fair value 5,296 5,311
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 91,600 95,056
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 9,294 11,193
Securities available for sale, at fair value 82,306 83,863
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 9,117 9,682
Securities available for sale, gross unrealized gains 53 20
Securities available for sale, gross unrealized losses 223 349
Securities available for sale, at fair value 8,947 9,353
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 151,901 151,143
Securities available for sale, gross unrealized gains 18 0
Securities available for sale, gross unrealized losses 10,495 13,162
Securities available for sale, at fair value 141,424 137,981
US Treasury and Government [Member]    
Securities available for sale, amortized cost 82,638 82,646
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 2,827 3,914
Securities available for sale, at fair value 79,811 78,732
Municipal Notes [Member]    
Securities available for sale, amortized cost 172,666 168,939
Securities available for sale, gross unrealized gains 426 177
Securities available for sale, gross unrealized losses 15,490 18,226
Securities available for sale, at fair value 157,602 150,890
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 1,704 1,689
Securities held to maturity, fair value $ 5,296 $ 5,311