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Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financial assets [Abstract]    
Interest bearing time deposits with other banks $ 10,532 $ 10,283
Level I [Member]    
Financial assets [Abstract]    
Cash and due from banks 12,475 18,517
Interest bearing time deposits with other banks 0 0
Loans held for sale 233 1,439
Net loans 0 0
Bank owned life insurance 27,035 26,883
Regulatory stock 6,705 6,784
Accrued interest receivable 4,283 4,196
Financial liabilities [Abstract]    
Deposits 847,737 838,490
Borrowed funds 87,413 77,650
Accrued interest payable 867 897
Level II [Member]    
Financial assets [Abstract]    
Cash and due from banks 0 0
Interest bearing time deposits with other banks 0 0
Loans held for sale 0  
Net loans 0 0
Bank owned life insurance 0 0
Regulatory stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 0 0
Borrowed funds 0 0
Accrued interest payable 0 0
Level III [Member]    
Financial assets [Abstract]    
Cash and due from banks 0 0
Interest bearing time deposits with other banks 10,543 10,287
Loans held for sale 0  
Net loans 1,001,421 981,238
Bank owned life insurance 0 0
Regulatory stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 262,318 263,093
Borrowed funds 35,409 35,802
Accrued interest payable 0  
Carrying Amount [Member]    
Financial assets [Abstract]    
Cash and due from banks 12,475 18,517
Interest bearing time deposits with other banks 10,532 10,283
Loans held for sale 233 1,439
Net loans 1,020,151 989,335
Bank owned life insurance 27,035 26,883
Regulatory stock 6,705 6,784
Accrued interest receivable 4,283 4,196
Financial liabilities [Abstract]    
Deposits 1,115,153 1,104,943
Borrowed funds 124,121 114,664
Accrued interest payable 867 897
Fair Value [Member]    
Financial assets [Abstract]    
Cash and due from banks 12,475 18,517
Interest bearing time deposits with other banks 10,543 10,287
Loans held for sale 233 1,439
Net loans 1,001,421 981,238
Bank owned life insurance 27,035 26,883
Regulatory stock 6,705 6,784
Accrued interest receivable 4,283 4,196
Financial liabilities [Abstract]    
Deposits 1,110,055 1,101,583
Borrowed funds 122,822 113,452
Accrued interest payable $ 867 $ 897