Estimated Fair Value of Financial Instruments - Level 3 Valuation Inputs and Technique (Details) (Internal Models with Significant Unobservable Market Parameters (Level 3), USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans	$ 885,456
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans	2,353	21,986
Fair Value, Measurements, Nonrecurring [Member] | Collateral dependent impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans	$ 2,353