Derivatives - Schedules of Offsetting Liability Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	$ 77	$ 149
Interest rate swaps
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	71
Retail interest rate contracts
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities		78
Not Designated as Hedging Instrument
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	149
Not Designated as Hedging Instrument | Interest rate swaps
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	71
Gross amounts offset in the Statement of Financial Position	0	0
Net amounts of assets and liabilities presented in the Statement of Financial Position	77	71
Gross amounts not offset in the Statement of Financial Position, Financial Instruments	0	0
Gross amounts not offset in the Statement of Financial Position, Collateral Posted	77	71
Net Amount	$ 0	0
Not Designated as Hedging Instrument | Retail interest rate contracts
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities		78
Gross amounts offset in the Statement of Financial Position		0
Net amounts of assets and liabilities presented in the Statement of Financial Position		78
Gross amounts not offset in the Statement of Financial Position, Financial Instruments		0
Gross amounts not offset in the Statement of Financial Position, Collateral Posted		0
Net Amount		$ 78