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Note 16 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
 
 
 
 
Fair Value Measurements at December 31, 20
17 Using
 
Description
 
Balance as of
December 31,
2017
   
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
U.S. Government agencies and corporations
 
$
307,719
   
$
---
   
$
307,719
   
$
---
 
States and political subdivisions
 
 
16,834
   
 
---
   
 
16,834
   
 
---
 
Mortgage-backed securities
 
 
659
   
 
---
   
 
659
   
 
---
 
Corporate debt securities
 
 
6,175
   
 
---
   
 
6,175
   
 
---
 
Total securities available for sale
 
$
331,387
   
$
---
   
$
331,387
   
$
---
 
   
 
 
 
 
Fair Value Measurements at December 31, 20
16 Using
 
Description
 
Balance as of
December 31,
2016
   
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
U.S. Government agencies and corporations
  $
285,598
    $
---
    $
285,598
    $
---
 
States and political subdivisions
   
11,693
     
---
     
11,693
     
---
 
Mortgage-backed securities
   
930
     
---
     
930
     
---
 
Corporate debt securities
   
5,898
     
---
     
5,898
     
---
 
Other securities
   
163
     
---
     
163
     
---
 
Total securities available for sale
  $
304,282
    $
---
    $
304,282
    $
---
 
Fair Value Measurements, Nonrecurring [Table Text Block]
       
 
 
 
 
Carrying value
 
Date
 
Description
 
Balance
   
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
   
Assets:
   
 
     
 
     
 
     
 
 
December 31, 201
7
 
Impaired
loans net of valuation allowance
 
$
1,303
   
$
---
   
$
---
   
$
1,303
 
December 31, 201
6
 
Impaired loans net of valuation allowance
   
878
     
---
     
---
     
878
 
       
 
 
 
 
Carrying
Value
 
Date
 
Description
 
Balance
   
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
   
Assets:
   
 
     
 
     
 
     
 
 
December 31, 201
7
 
Other real estate owned net of valuation allowance
 
$
2,817
   
$
---
   
$
---
   
$
2,817
 
December 31, 201
6
 
Other real estate owned net of valuation allowance
   
3,156
     
---
     
---
     
3,156
 
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
Impaired Loans
 
Valuation Technique
 
Unobservable Input
 
Range
(Weighted Average)
 
December 31, 2017
 
Present value of cash flows
 
Discount rate
 
 5.50%
-
13.25%
(5.92%)
 
December 31, 2016
 
Present value of cash flows
 
Discount rate
 
 6.75%
-
8.00%
(7.35%)
 
   
Valuation Technique
 
Unobservable Input
 
Rang
(Weighted Average)
 
                     
Other real estate owned
 
Discounted appraised value
 
Selling cost
 
 2.00%
(1)
6.01%
(4.72%)
 
Other real estate owned
 
Discounted appraised value
 
Discount for lack of marketability and age of appraisal
 
 1.68%
68.33%
(11.07%)
 
   
Valuation Technique
 
Unobservable Input
 
Range
(Weighted Average)
 
                     
Other real estate owned
 
Discounted appraised value
 
Selling cost
 
 2.91%
(1)
8.60%
(6.48%)
 
Other real estate owned
 
Discounted appraised value
 
Discount for lack of marketability and age of appraisal
 
 0%
53.46%
(13.66%)
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December
31, 2017
 
   
 
 
 
 
Estimated Fair Value
 
   
Carrying
Amount
   
Level 1
   
Level 2
   
Level 3
 
Financial assets:
                               
Cash and due from banks
 
$
12,926
   
$
12,926
   
$
---
   
$
---
 
Interest-bearing deposits
 
 
51,233
   
 
51,233
   
 
---
   
 
---
 
Securities
 
 
458,551
   
 
---
   
 
461,500
   
 
---
 
Restricted securities
 
 
1,200
   
 
---
   
 
1,200
   
 
---
 
Mortgage loans held for sale
 
 
260
   
 
---
   
 
260
   
 
---
 
Loans, net
 
 
660,144
   
 
---
   
 
---
   
 
656,399
 
Accrued interest receivable
 
 
5,297
   
 
---
   
 
5,297
   
 
---
 
Bank-owned life insurance
 
 
33,756
   
 
---
   
 
33,756
   
 
---
 
Financial liabilities:
                               
Deposits
 
$
1,059,734
   
$
---
   
$
944,850
   
$
113,053
 
Accrued interest payable
 
 
62
   
 
---
   
 
62
   
 
---
 
   
December 31, 201
6
 
   
 
 
 
 
Estimated Fair Value
 
   
Carrying
Amount
   
Level 1
   
Level 2
   
Level 3
 
Financial assets:
                               
Cash and due from banks
  $
13,974
    $
13,974
    $
---
    $
---
 
Interest-bearing deposits
   
80,268
     
80,268
     
---
     
---
 
Securities
   
439,239
     
---
     
441,974
     
---
 
Restricted securities
   
1,170
     
---
     
1,170
     
---
 
Mortgage loans held for sale
   
478
     
---
     
478
     
---
 
Loans, net
   
639,452
     
---
     
---
     
658,386
 
Accrued interest receivable
   
5,260
     
---
     
5,260
     
---
 
Bank-owned life insurance
   
22,998
     
---
     
22,998
     
---
 
Financial liabilities:
                               
Deposits
  $
1,043,442
    $
---
    $
912,828
    $
128,690
 
Accrued interest payable
   
55
     
---
     
55
     
---