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Note 9 - Financial and Off-balance Sheet Instruments (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 13,708,000 $ 13,458,000 $ 29,870,000 $ 16,331,000
Equities 10,482,000 9,421,000    
Available-for-sale 344,367,000 344,221,000    
Restricted investment in stocks 1,238,000 797,000    
Net loans 795,513,000 776,614,000    
Mortgage servicing rights 446,000 451,000    
Accrued interest receivable 4,212,000 2,852,000    
Deposits 1,034,614,000 1,015,598,000    
Short-term borrowings 49,897,000 50,872,000    
Accrued interest payable 450,000 449,000    
Cash and cash equivalents 13,708,000 13,458,000    
Restricted investment in stocks 1,238,000 797,000    
Net loans 795,909,000 771,685,000    
Mortgage servicing rights 574,000 604,000    
Accrued interest receivable 4,212,000 2,852,000    
Short-term borrowings 49,897,000 50,872,000    
Accrued interest payable 450,000 449,000    
Fair Value, Inputs, Level 1 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Equities 10,482,000 9,421,000    
Cash and cash equivalents 13,708,000 13,458,000    
Short-term borrowings 49,897,000 50,872,000    
Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Available-for-sale 344,255,000 344,105,000    
Restricted investment in stocks 1,238,000 797,000    
Accrued interest receivable 4,212,000 2,852,000    
Accrued interest payable 450,000 449,000    
Fair Value, Inputs, Level 3 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Available-for-sale 112,000 116,000    
Net loans 795,909,000 771,685,000    
Mortgage servicing rights 574,000 604,000    
Standby Letters of Credit [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Commitments to extend credit 63,000 31,000    
Standby Letters of Credit [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Commitments to extend credit 63,000 31,000    
With No Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits 811,895,000 791,810,000    
Deposits 811,895,000 791,810,000    
With No Stated Maturities [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits 811,895,000 791,810,000    
With Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits 222,719,000 223,788,000    
Deposits 220,896,000 220,876,000    
With Stated Maturities [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits $ 220,896,000 $ 220,876,000