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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Available-for-Sale, Amortized Cost $ 468,549 $ 507,466
Securities available for sale, gross unrealized gains 787 197
Securities available for sale, gross unrealized losses 32,065 46,844
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 437,271 460,819
Securities held to maturity, at amortized cost (fair value $4,446 and $5,311, respectively) 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,554 1,689
Held-to-Maturity, Fair Value 4,446 5,311
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-Sale, Amortized Cost 81,166 95,056
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 9,122 11,193
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 72,044 83,863
Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale, Amortized Cost 25,402 9,682
Securities available for sale, gross unrealized gains 94 20
Securities available for sale, gross unrealized losses 323 349
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 25,173 9,353
US Government Agencies Debt Securities [Member]    
Available-for-Sale, Amortized Cost 138,174 151,143
Securities available for sale, gross unrealized gains 38 0
Securities available for sale, gross unrealized losses 8,707 13,162
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 129,505 137,981
US Treasury and Government [Member]    
Available-for-Sale, Amortized Cost 64,758 82,646
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 1,674 3,914
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 63,084 78,732
Municipal Notes [Member]    
Available-for-Sale, Amortized Cost 159,049 168,939
Securities available for sale, gross unrealized gains 655 177
Securities available for sale, gross unrealized losses 12,239 18,226
Securities available for sale, at fair value (amortized cost $468,549 and $507,466, respectively) 147,465 150,890
Corporate Note Securities [Member]    
Securities held to maturity, at amortized cost (fair value $4,446 and $5,311, respectively) 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,554 1,689
Held-to-Maturity, Fair Value $ 4,446 $ 5,311