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Fair Value Measurements - Quantitative Information about Level III Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value estimate	$ 4,730	$ 5,168	$ 4,832	$ 362	$ 287	$ 273
Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Asset	487	993
Impaired loans - Real estate secured \| Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value estimate	$ 598	$ 1,371
Impaired loans - Real estate secured \| Nonrecurring \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	0.00%	0.00%
Impaired loans - Real estate secured \| Nonrecurring \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	20.00%	20.00%
Impaired loans - Real estate secured \| Nonrecurring \| Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	10.00%	10.00%
Impaired loans - Non-real estate secured \| Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value estimate	$ 5,239	$ 5,551
Impaired loans - Non-real estate secured \| Nonrecurring \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	0.00%	0.00%
Impaired loans - Non-real estate secured \| Nonrecurring \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	20.00%	20.00%
Impaired loans - Non-real estate secured \| Nonrecurring \| Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	10.00%	5.00%
Other real estate owned \| Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	10.00%
Derivative assets \| Recurring \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	75.00%	75.00%
Derivative assets \| Recurring \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	90.00%	90.00%
Derivative assets \| Recurring \| Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	85.50%	89.00%
Derivative liabilities \| Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative liabilities	$ 71	$ 325
Derivative liabilities \| Recurring \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	75.00%	75.00%
Derivative liabilities \| Recurring \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	90.00%	90.00%
Derivative liabilities \| Recurring \| Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	85.50%	89.00%
Asset backed securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value estimate		$ 4,500
Asset backed securities \| Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value estimate	$ 4,321
Asset backed securities \| Recurring \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	3.00%	3.00%
Asset backed securities \| Recurring \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	6.00%	6.00%
Asset backed securities \| Recurring \| Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	5.00%	5.00%