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Loans and Allowance for Loan Losses - Related Party Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]      
Balance at beginning of year $ 3,329 $ 3,749 $ 3,425
Additions 0 0 550
Advances 165 0 569
Repayments (390) (420) 0
Reclassified as unrelated-party loan due to a change in borrower status (542) 0 (795)
Balance at end of year 2,562 $ 3,329 $ 3,749
Undisbursed commitment to related parties $ 1,000