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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities available for sale, amortized cost $ 413,441 $ 274,709
Securities available for sale, gross unrealized gains 6,920 8,830
Securities available for sale, gross unrealized losses 1,427 37
Securities available for sale, at fair value 418,934 283,502
Securities held to maturity, amortized cost 2,000 0
Securities held to maturity, gross unrealized gains 37  
Securities held to maturity, gross unrealized losses 0  
Securities held to maturity, fair value 2,037  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 96,100 59,997
Securities available for sale, gross unrealized gains 1,032 1,362
Securities available for sale, gross unrealized losses 179 0
Securities available for sale, at fair value 96,953 61,359
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 9,439 20,842
Securities available for sale, gross unrealized gains 124 218
Securities available for sale, gross unrealized losses 1 30
Securities available for sale, at fair value 9,562 21,030
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 124,916 80,359
Securities available for sale, gross unrealized gains 711 1,175
Securities available for sale, gross unrealized losses 782 3
Securities available for sale, at fair value 124,845 81,531
US Treasury and Government [Member]    
Securities available for sale, amortized cost 40,609  
Securities available for sale, gross unrealized gains 0  
Securities available for sale, gross unrealized losses 81  
Securities available for sale, at fair value 40,528  
Municipal Notes [Member]    
Securities available for sale, amortized cost 142,377 113,511
Securities available for sale, gross unrealized gains 5,053 6,075
Securities available for sale, gross unrealized losses 384 4
Securities available for sale, at fair value 147,046 $ 119,582
Corporate Note Securities [Member]    
Securities held to maturity, amortized cost 2,000  
Securities held to maturity, gross unrealized gains 37  
Securities held to maturity, gross unrealized losses 0  
Securities held to maturity, fair value $ 2,037