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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Composition of gross loans by rate type    
Variable rate loans $ 349,493 $ 290,462
Fixed rate loans 1,037,577 873,182
Total gross loans, net of deferred fees $ 1,387,070 $ 1,163,644