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Fair Value Measurements, By Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Financial assets [Abstract]    
Interest bearing time deposits with other banks $ 8,791 $ 6,955
Available-for-sale securities $ 275,208 314,017
Financial liabilities [Abstract]    
Consideration period for recognition of cash and due from banks 90 days  
Consideration period for recognition of accrued interest receivable and payable 90 days  
Level I [Member]    
Financial assets [Abstract]    
Cash and due from banks $ 19,362 17,754
Interest bearing time deposits with other banks 0 0
Available-for-sale securities 1,671 5,899
Loans held for sale 393 1,827
Net loans 0 0
Bank owned life insurance 26,556 26,223
Regulatory stock 4,490 5,306
Accrued interest receivable 3,697 4,089
Financial liabilities [Abstract]    
Deposits 791,387 740,889
Borrowed funds 30,396 41,330
Accrued interest payable 628 720
Level II [Member]    
Financial assets [Abstract]    
Cash and due from banks 0 0
Interest bearing time deposits with other banks 0 0
Available-for-sale securities 273,537 308,118
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 8,791 6,960
Available-for-sale securities   0
Net loans 878,901 797,184
Bank owned life insurance 0 0
Regulatory stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 258,446 263,183
Borrowed funds 38,107 36,095
Accrued interest payable 0  
Carrying Amount [Member]    
Financial assets [Abstract]    
Cash and due from banks 19,362 17,754
Interest bearing time deposits with other banks 8,791 6,955
Available-for-sale securities 275,208 314,017
Loans held for sale 393 1,827
Net loans 878,070 790,725
Bank owned life insurance 26,556 26,223
Regulatory stock 4,490 5,306
Accrued interest receivable 3,697 4,089
Financial liabilities [Abstract]    
Deposits 1,051,209 1,005,503
Borrowed funds 69,998 79,662
Accrued interest payable 628 720
Fair Value [Member]    
Financial assets [Abstract]    
Cash and due from banks 19,362 17,754
Interest bearing time deposits with other banks 8,791 6,960
Available-for-sale securities 275,208 314,017
Loans held for sale 393 1,827
Net loans 878,901 797,184
Bank owned life insurance 26,556 26,223
Regulatory stock 4,490 5,306
Accrued interest receivable 3,697 4,089
Financial liabilities [Abstract]    
Deposits 1,049,833 1,004,072
Borrowed funds 68,503 77,425
Accrued interest payable $ 628 $ 720