Disclosures About Fair Value of Assets and Liabilities - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Discounted cash flow | State and municipal | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Maturity/Call date	1 month	1 month
Blend of US Muni BQ curve	A-	A-
Discount rate	1.00%	1.00%
Discounted cash flow | State and municipal | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Maturity/Call date	18 years	15 years
Blend of US Muni BQ curve	BBB-	BBB-
Discount rate	6.25%	5.00%
Discounted cash flow | Corporate obligations/Equity securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Risk free rate	3 month LIBOR	3 month LIBOR
Discount to reflect current market conditions	2.00%	2.00%
Collateral based measurements | Impaired loans (collateral dependent) | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.00%	0.00%
Collateral based measurements | Impaired loans (collateral dependent) | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	50.00%	50.00%
Collateral based measurements | Impaired loans (collateral dependent) | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	2.00%	3.00%
Appraisals | Other real estate owned | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions	0.00%	0.00%
Appraisals | Other real estate owned | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions	20.00%	20.00%
Appraisals | Other real estate owned | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions	4.00%	2.00%
Significant Unobservable Inputs (Level 3) | Discounted cash flow | State and municipal
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 6,630	$ 7,235
Significant Unobservable Inputs (Level 3) | Discounted cash flow | Corporate obligations/Equity securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	857	2,742
Significant Unobservable Inputs (Level 3) | Collateral based measurements | Impaired loans (collateral dependent)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	19,830	12,117
Significant Unobservable Inputs (Level 3) | Appraisals | Other real estate owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 5,638	$ 6,877