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Note 4 - Mortgage Banking (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Activity in Secondary Market Loans [Table Text Block]

(Dollars in thousands)

                        
   

2020

    

2019

    

2018

  

Loans originated for resale, net of principal payments

   $ 326,286     $ 63,920     $ 33,555  

Proceeds from loan sales

     325,306       62,763       34,872  

Net gains on sales of loans held for sale

     11,313       1,951       1,003  

Loan servicing fees, net of amortization

     (129 )     82       91  
Servicing Asset at Amortized Cost [Table Text Block]

(Dollars in thousands)

                        
   

2020

    

2019

    

2018

  

Balance, beginning of year

   $ 2,131     $ 1,049     $ 908  

Capitalized

     3,554       822       441  

Amortization

     (1,344 )     (453 )     (300 )
Market valuation allowance change     (374 )     -       -  
Acquired from merger with County Bank Corp.     -       713       -  

Balance, end of year

   $ 3,967     $ 2,131     $ 1,049