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Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities available for sale $ 418,934 $ 283,502
Equity securities 1,900 1,600
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 96,953 61,359
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 9,562 21,030
US Government Agencies Debt Securities [Member]    
Securities available for sale 124,845 81,531
US Treasury and Government [Member]    
Securities available for sale 40,528  
Municipal Notes [Member]    
Securities available for sale 147,046 119,582
Fair Value, Recurring [Member]    
Securities available for sale 418,934 283,502
Equity securities 1,913 1,553
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 96,953 61,359
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 9,562 21,030
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 124,845 81,531
Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 40,528  
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 147,046 119,582
Fair Value, Nonrecurring [Member]    
Impaired loans 2,644 3,168
Loans held for sale 4,087 7,941
Foreclosed real estate 64  
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 1,347 1,728
Foreclosed real estate 64  
Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 100 97
Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 719 779
Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 181 211
Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 297 353
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 0 0
Equity securities 1,913 1,553
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 0 0
Loans held for sale 0 0
Foreclosed real estate 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 0 0
Foreclosed real estate 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 418,934 283,502
Equity securities 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 96,953 61,359
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 9,562 21,030
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 124,845 81,531
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 40,528  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 147,046 119,582
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 0 0
Loans held for sale 4,087 7,941
Foreclosed real estate 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 0 0
Foreclosed real estate 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 0 0
Equity securities 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 2,644 3,168
Loans held for sale 0 0
Foreclosed real estate 64  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 1,347 1,728
Foreclosed real estate 64  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 100 97
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 719 779
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 181 211
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans $ 297 $ 353