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Portfolio Loans - Summary of Loans to Executive Officers and Directors (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance at beginning of year $ 4,394 $ 13,513 $ 11,752
New loans and advances 11,539 641 11,796
Payments and other reductions (527) (9,760) (10,035)
Balance at end of year $ 15,406 $ 4,394 $ 13,513