Fair Value Measurements (Detail 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Fair value, Real estate held for sale	$ 5,718	$ 3,515
Recurring | Level 3 | Derivative loan commitments
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Fair Value, Assets	120
Fair Value, Liabilities		4
Recurring | Level 3 | Forward loan sale commitments
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Fair Value, Assets		248
Fair Value, Liabilities	8
Non-recurring | Level 3
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Fair value, Impaired loans (collateral dependent)	1,379	987
Fair value, Real estate held for sale	$ 3,831	$ 3,515
Non-recurring | Level 3 | Real estate held for sale | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Selling costs (as a percent)		5.00%
Minimum | Recurring | Level 3 | Derivative loan commitments | Investor pricing
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Pull-through rate (as a percent)	82.50%	82.50%
Pricing spreads (as a percent)	99.14%	95.28%
Minimum | Recurring | Level 3 | Forward loan sale commitments | Investor pricing
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Pull-through rate (as a percent)	82.50%	825.50%
Pricing spreads (as a percent)	99.13%	94.55%
Minimum | Non-recurring | Level 3 | Impaired loans (collateral dependent) | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Collateral discounts/selling costs (as a percent)	5.00%	5.00%
Minimum | Non-recurring | Level 3 | Foreclosed real estate | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Collateral discounts/selling costs (as a percent)	5.00%	5.00%
Minimum | Non-recurring | Level 3 | Real estate held for sale | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Selling costs (as a percent)	5.00%
Maximum | Recurring | Level 3 | Derivative loan commitments | Investor pricing
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Pull-through rate (as a percent)	100.00%	100.00%
Pricing spreads (as a percent)	107.96%	106.16%
Maximum | Recurring | Level 3 | Forward loan sale commitments | Investor pricing
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Pull-through rate (as a percent)	100.00%	100.00%
Pricing spreads (as a percent)	108.35%	106.16%
Maximum | Non-recurring | Level 3 | Impaired loans (collateral dependent) | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Collateral discounts/selling costs (as a percent)	30.00%	30.00%
Maximum | Non-recurring | Level 3 | Foreclosed real estate | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Collateral discounts/selling costs (as a percent)	30.00%	30.00%
Maximum | Non-recurring | Level 3 | Real estate held for sale | Appraisal of collateral
Additional quantitative information about assets and liabilities measured at fair value on a recurring and non-recurring basis
Selling costs (as a percent)	6.00%