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Note 5 - Impaired Loans (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance $ 4,943
Unpaid principal balance - with no specific allowance 5,820
Recorded investment - with an allowance 4,624
Unpaid principal balance - with an allowance 5,169
Related allowance 696
Unpaid principal balance 10,989
Recorded investment 9,567
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 1,402
Unpaid principal balance - with no specific allowance 1,694
Recorded investment - with an allowance 419
Unpaid principal balance - with an allowance 601
Related allowance 125
Unpaid principal balance 2,295
Recorded investment 1,821
Commercial Portfolio Segment [Member] | Construction Loans [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 0
Unpaid principal balance - with no specific allowance 0
Recorded investment - with an allowance 0
Unpaid principal balance - with an allowance 0
Related allowance 0
Unpaid principal balance 0
Recorded investment 0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 2,198
Unpaid principal balance - with no specific allowance 2,608
Recorded investment - with an allowance 3,111
Unpaid principal balance - with an allowance 3,312
Related allowance 131
Unpaid principal balance 5,920
Recorded investment 5,309
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 430
Unpaid principal balance - with no specific allowance 482
Recorded investment - with an allowance 932
Unpaid principal balance - with an allowance 1,065
Related allowance 321
Unpaid principal balance 1,547
Recorded investment 1,362
Retail Portfolio Segment [Member] | Consumer Loans [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 45
Unpaid principal balance - with no specific allowance 62
Recorded investment - with an allowance 0
Unpaid principal balance - with an allowance 0
Related allowance 0
Unpaid principal balance 62
Recorded investment 45
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 628
Unpaid principal balance - with no specific allowance 678
Recorded investment - with an allowance 0
Unpaid principal balance - with an allowance 0
Related allowance 0
Unpaid principal balance 678
Recorded investment 628
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]  
Financing Receivable Impaired [Line Items]  
Recorded investment - with no specific allowance 240
Unpaid principal balance - with no specific allowance 296
Recorded investment - with an allowance 162
Unpaid principal balance - with an allowance 191
Related allowance 119
Unpaid principal balance 487
Recorded investment $ 402