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Fair Value Measurements - Nonrecurring (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Assets and liabilities measured at fair value
Valuation allowance	$ 25	$ 278
Carrying value of other real estate owned	24,451	31,982	$ 31,964	$ 40,877	$ 39,232	$ 41,537
OREO Valuation allowance	19,872	19,229	$ 20,069	$ 19,045	$ 17,873	$ 22,284
Nonrecurring
Assets and liabilities measured at fair value
Total	24,743	32,546
Nonrecurring | Impaired loans
Assets and liabilities measured at fair value
Total	292	564
Valuation allowance	25	278
Decrease of specific allocations within the provision for loan losses	252	2,100
Nonrecurring | Impaired loans | Carrying Amount
Assets and liabilities measured at fair value
Total	317	842
Nonrecurring | Other real estate owned
Assets and liabilities measured at fair value
Total	24,451	31,982
Carrying value of other real estate owned	24,500	32,000
Outstanding balance	46,100	53,000
OREO Valuation allowance	19,900	19,200
OREO participations	1,700	1,800
Nonrecurring | Level 3
Assets and liabilities measured at fair value
Total	24,743	32,546
Nonrecurring | Level 3 | Impaired loans
Assets and liabilities measured at fair value
Total	292	564
Nonrecurring | Level 3 | Other real estate owned
Assets and liabilities measured at fair value
Total	$ 24,451	$ 31,982

X

- Definition

Represents the amount of increase (decrease) in specific allocations within the provision for loan losses for impaired financing receivables.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of allowance for credit losses related to recorded investment.

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