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Loans and Loans Held for Sale - Summary of Aggregate Amount of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Loans Receivable from Officers and Directors [Roll Forward]    
Balance at beginning of year $ 25,167 $ 24,517
New loans 25,203 22,740
Repayments or no longer considered a related party (40,300) (22,090)
Balance at end of year $ 10,070 $ 25,167