Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 419	$ 546
Valuation Technique	Discounted cash flow	Discounted cash flow
Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	1,171	2,219
Impaired Loans Construction [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	1,564	1,587
Consumer Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value		339
Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	1,435	1,939
Construction Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,988	$ 2,310
Sales Comparison Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Sales comparison approach	Sales comparison approach
Sales Comparison Approach [Member] | Impaired Loans Construction [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Sales comparison approach	Sales comparison approach
Sales Comparison Approach [Member] | Consumer Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique		Sales comparison approach
Sales Comparison Approach [Member] | Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Sales comparison approach	Sales comparison approach
Sales Comparison Approach [Member] | Construction Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Sales comparison approach	Sales comparison approach
Income Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Income approach	Income approach
Weighted Average [Member] | Sales Comparison Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	11.78%	11.78%
Weighted Average [Member] | Sales Comparison Approach [Member] | Impaired Loans Construction [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	11.90%	11.90%
Weighted Average [Member] | Sales Comparison Approach [Member] | Consumer Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales		5.00%
Weighted Average [Member] | Sales Comparison Approach [Member] | Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	17.76%	17.76%
Weighted Average [Member] | Sales Comparison Approach [Member] | Construction Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	9.24%	9.24%
Weighted Average [Member] | Income Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences in net operating income Capitalization rate	9.41%	9.41%
Minimum [Member] | Sales Comparison Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	0.00%	0.00%
Minimum [Member] | Sales Comparison Approach [Member] | Impaired Loans Construction [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	0.00%	0.00%
Minimum [Member] | Sales Comparison Approach [Member] | Consumer Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales		0.00%
Minimum [Member] | Sales Comparison Approach [Member] | Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	6.00%	6.00%
Minimum [Member] | Sales Comparison Approach [Member] | Construction Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	6.54%	6.54%
Minimum [Member] | Income Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	3.95%	3.95%
Maximum [Member] | Sales Comparison Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	56.90%	56.90%
Maximum [Member] | Sales Comparison Approach [Member] | Impaired Loans Construction [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	25.00%	25.00%
Maximum [Member] | Sales Comparison Approach [Member] | Consumer Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales		10.00%
Maximum [Member] | Sales Comparison Approach [Member] | Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	46.53%	46.53%
Maximum [Member] | Sales Comparison Approach [Member] | Construction Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	26.63%	26.63%
Maximum [Member] | Income Approach [Member] | Impaired Loans Permanent Real Estate Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjustment for differences between comparable sales	14.62%	14.62%