Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 2,090	$ 812
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	2,090	812
Derivative Liabilities	(2,032)	(2,584)
Total net derivatives	58	(1,772)
Trading | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	90	182
Derivative Liabilities	0	0
Total net derivatives	90	182
Cash Flow | Designated as Hedging Instrument | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(2,032)	(2,584)
Total net derivatives	(2,032)	(2,584)
Fair Value | Designated as Hedging Instrument | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	2,000	630
Derivative Liabilities	0	0
Total net derivatives	$ 2,000	$ 630