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Derivatives, Hedging Activities, and Other Financial Instruments - Notional and Fair Value of Derivatives Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Other assets    
Derivative [Line Items]    
Derivative asset, notional amount $ 81,205 $ 59,305
Credit risk derivative asset, fair value 2,902 1,722
Other liabilities    
Derivative [Line Items]    
Derivative liability, notional amount 81,205 59,305
Credit risk derivative liability, fair value $ 3,047 $ 1,813