Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - Interest rate contracts - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 35	$ 135
Derivatives designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	972	688
Derivatives not designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	14,194	11,948
Derivatives not designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 14,194	$ 11,948