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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-Sale, Amortized Cost $ 489,187 $ 507,466
Securities available for sale, gross unrealized gains 2 197
Securities available for sale, gross unrealized losses 49,109 46,844
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 440,080 460,819
Securities held to maturity, at amortized cost (fair value $4,472 and $5,311, respectively) 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,528 1,689
Held-to-Maturity, Fair Value 4,472 5,311
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-Sale, Amortized Cost 84,385 95,056
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 12,312 11,193
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 72,073 83,863
Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale, Amortized Cost 23,439 9,682
Securities available for sale, gross unrealized gains 0 20
Securities available for sale, gross unrealized losses 624 349
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 22,815 9,353
US Government Agencies Debt Securities [Member]    
Available-for-Sale, Amortized Cost 147,195 151,143
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 12,203 13,162
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 134,992 137,981
US Treasury and Government [Member]    
Available-for-Sale, Amortized Cost 76,527 82,646
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 2,813 3,914
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 73,714 78,732
Municipal Notes [Member]    
Available-for-Sale, Amortized Cost 157,641 168,939
Securities available for sale, gross unrealized gains 2 177
Securities available for sale, gross unrealized losses 21,157 18,226
Securities available for sale, at fair value (amortized cost $489,187 and $507,466, respectively) 136,486 150,890
Corporate Note Securities [Member]    
Securities held to maturity, at amortized cost (fair value $4,472 and $5,311, respectively) 7,000 7,000
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 2,528 1,689
Held-to-Maturity, Fair Value $ 4,472 $ 5,311