Loans and Allowance for Loan Losses - Investment in Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	$ 2,897	$ 23
Residential Real Estate
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	415	$ 23
Commercial | Commercial
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	100
Other | Commercial Real Estate
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	$ 2,382