Summary of Accounting Policies - Summary of Loans Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Accounting Policies [Line Items]
Loans held for sale	$ 59,461	$ 61,359
Residential Mortgage
Schedule Of Accounting Policies [Line Items]
Loans held for sale	17,004	5,834
Commercial Loans
Schedule Of Accounting Policies [Line Items]
Loans held for sale	$ 42,457	$ 55,525