Derivatives - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Total other liabilities	$ 77	$ 149
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative asset	261	71
Total other liabilities	77	71
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Derivative asset	873	1,137
Retail interest rate contracts
Derivatives, Fair Value [Line Items]
Total other liabilities		78
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset	950	1,208
Total other liabilities	77	149
Not Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative asset	77	71
Total other liabilities	77	71
Not Designated as Hedging Instrument | Interest rate swaps | Other assets
Derivatives, Fair Value [Line Items]
Derivative asset	77	71
Not Designated as Hedging Instrument | Interest rate swaps | Other liabilities
Derivatives, Fair Value [Line Items]
Total other liabilities	77	71
Not Designated as Hedging Instrument | Interest rate lock commitments | Other assets
Derivatives, Fair Value [Line Items]
Derivative asset	873	1,137
Not Designated as Hedging Instrument | Retail interest rate contracts
Derivatives, Fair Value [Line Items]
Total other liabilities		78
Not Designated as Hedging Instrument | Retail interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Total other liabilities	$ 0	$ 78