Estimated Fair Value of Financial Instruments - Level 3 Valuation Inputs and Technique (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2014 Internal Models with Significant Unobservable Market Parameters (Level 3)	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Internal Models with Significant Unobservable Market Parameters (Level 3)	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Internal Models with Significant Unobservable Market Parameters (Level 3)	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Internal Models with Significant Unobservable Market Parameters (Level 3) Collateral dependent impaired loans	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans	$ 913,057	$ 1,334	$ 21,986	$ 1,334
Comparability adjustments (percent)					15.00%	20.00%