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Fair Value Measurements - Assets Measured on a Recurring and Nonrecurring Basis (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Assets:      
Securities available-for-sale $ 48,560,000   $ 53,547,000
Fair value, assets measured on recurring basis, unobservable input reconciliation      
Impaired loans 4,537,000   2,453,000
Principal balance of impaired loans 227,000   0
Valuation allowance 149,000   0
Increase in the provision for loan losses $ 149,000   0
Discount rate on appraisal values for loans and real estate properties 20.00%    
U. S. government agencies and government sponsored entities      
Assets:      
Securities available-for-sale $ 1,978,000   1,957,000
Agency mortgage-backed securities: residential      
Assets:      
Securities available-for-sale 24,378,000   27,957,000
State and municipal      
Assets:      
Securities available-for-sale 20,824,000   21,380,000
Trust preferred security      
Assets:      
Securities available-for-sale 1,380,000   1,240,000
Corporate bonds      
Assets:      
Securities available-for-sale     1,013,000
Level 2      
Assets:      
Securities available-for-sale 47,180,000   52,307,000
Level 3      
Assets:      
Securities available-for-sale 1,380,000   1,240,000
Recurring basis | Level 2      
Assets:      
Securities available-for-sale 47,180,000   52,307,000
Recurring basis | Level 2 | U. S. government agencies and government sponsored entities      
Assets:      
Securities available-for-sale 1,978,000   1,957,000
Recurring basis | Level 2 | Agency mortgage-backed securities: residential      
Assets:      
Securities available-for-sale 24,378,000   27,957,000
Recurring basis | Level 2 | State and municipal      
Assets:      
Securities available-for-sale 20,824,000   21,380,000
Recurring basis | Level 2 | Corporate bonds      
Assets:      
Securities available-for-sale     1,013,000
Recurring basis | Level 3      
Assets:      
Securities available-for-sale 1,380,000   1,240,000
Recurring basis | Level 3 | Trust preferred security      
Assets:      
Securities available-for-sale 1,380,000   1,240,000
Fair value, assets measured on recurring basis, unobservable input reconciliation      
Recurring Level 3 assets, beginning of period balance 1,240,000 $ 1,340,000 1,340,000
Losses for the period included in other comprehensive income 140,000 (80,000)  
Recurring Level 3 assets, end of period balance 1,380,000 $ 1,260,000 $ 1,240,000
Commercial Real Estate      
Fair value, assets measured on recurring basis, unobservable input reconciliation      
Impaired loans $ 78,000