Fair Value Measurements (Details 2) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale		$ 435,861	$ 447,498
Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member]
Investments in securities that are classified as level 3
Cumulative Default		13.50%	12.40%
Loss Given Default		94.40%	94.30%
Cure Given Default		60.90%	60.90%
Pooled trust preferred securities | Significant Unobservable Inputs (Level 3)
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale		$ 1,800	$ 1,640
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member]
Investments in securities that are classified as level 3
Cumulative Default		5.00%	5.00%
Loss Given Default		85.00%	85.00%
Cure Given Default		0.00%	0.00%
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member]
Investments in securities that are classified as level 3
Cumulative Default		100.00%	100.00%
Loss Given Default		100.00%	100.00%
Cure Given Default		75.00%	75.00%
Fair Value, Measurements, Recurring [Member] | Collateral dependent impaired loans | Significant Unobservable Inputs (Level 3)
Investments in securities that are classified as level 3
Assets, Fair Value Disclosure	[1]	$ 32,009	$ 33,567
Fair Value, Measurements, Recurring [Member] | Other real estate owned and other foreclosed assets | Significant Unobservable Inputs (Level 3)
Investments in securities that are classified as level 3
Assets, Fair Value Disclosure	[1]	$ 190	$ 612
Measurement Input, Constant Prepayment Rate [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member]
Investments in securities that are classified as level 3
Debt Securities, Available-for-sale, Measurement Input		0.024	0.025
Measurement Input, Constant Prepayment Rate [Member] | Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member]
Investments in securities that are classified as level 3
Debt Securities, Available-for-sale, Measurement Input		0	0
Measurement Input, Constant Prepayment Rate [Member] | Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member]
Investments in securities that are classified as level 3
Debt Securities, Available-for-sale, Measurement Input		0.59	0.61

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.