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Fair Value Measurements (Details 4) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Valuation Methodology
Investment securities, available-for-sale	$ 801,950	$ 791,727
Level 3
Valuation Methodology
Investment securities, available-for-sale	5,619	5,337
Recurring | Level 3
Valuation Methodology
Investment securities, available-for-sale	5,619	5,337
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities
Valuation Methodology
Investment securities, available-for-sale	$ 4,810	$ 4,528
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Minimum
Unobservable Inputs
Credit spread assumption (as a percent)	0.72%	1.27%
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Maximum
Unobservable Inputs
Credit spread assumption (as a percent)	1.60%	2.03%
Recurring | Level 3 | Discounted cash flows | Foreign government
Valuation Methodology
Investment securities, available-for-sale	$ 809	$ 809
Recurring | Level 3 | Discounted cash flows | Foreign government | Minimum
Unobservable Inputs
Market yield assumption (as a percent)	0.71%	0.88%
Recurring | Level 3 | Discounted cash flows | Foreign government | Maximum
Unobservable Inputs
Market yield assumption (as a percent)	1.91%	2.00%
Non-recurring | Level 3 | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	20.00%
Non-recurring | Level 3 | Minimum | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	40.00%
Non-recurring | Level 3 | Maximum | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	75.00%
Non-recurring | Level 3 | Trade publications | Aircraft
Unobservable Inputs
Discount rate (as a percent)	10.00%
Non-recurring | Level 3 | Auction values | Autos
Unobservable Inputs
Discount rate (as a percent)	10.00%
Non-recurring | Level 3 | Trade publications and auction values | Medium and heavy duty trucks
Unobservable Inputs
Discount rate (as a percent)	15.00%
Non-recurring | Level 3 | Trade publications and auction values | Construction equipment financing
Unobservable Inputs
Discount rate (as a percent)	20.00%
Non-recurring | Level 3 | Appraisals | Real estate
Unobservable Inputs
Discount rate (as a percent)	20.00%

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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-Name Accounting Standards Codification
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Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

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