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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Commitments to make loans | Fixed Rate    
The contractual amounts of financial instruments with off-balance-sheet risk at year end    
Total contractual amounts of financial instruments with off-balance-sheet risk $ 2,684 $ 100
Commitments to make loans | Variable Rate    
The contractual amounts of financial instruments with off-balance-sheet risk at year end    
Total contractual amounts of financial instruments with off-balance-sheet risk 1,250 4,836
Unused lines of credit | Fixed Rate    
The contractual amounts of financial instruments with off-balance-sheet risk at year end    
Total contractual amounts of financial instruments with off-balance-sheet risk 72,114 64,338
Unused lines of credit | Variable Rate    
The contractual amounts of financial instruments with off-balance-sheet risk at year end    
Total contractual amounts of financial instruments with off-balance-sheet risk $ 245,830 $ 204,889