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Investment Securities - Textual (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
loan
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
loan
Dec. 31, 2018
USD ($)
Investments, Debt and Equity Securities [Abstract]          
Securities classified as trading | $ $ 0   $ 0   $ 0
Mortgage backed securities evaluation non temporary decline number (securities) | loan 0 0 0 0