Securities - Additional Information Concerning the Company's Investments in Corporate Debt Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 10,311
Estimated Fair Value	10,325
Average Maturity (years)	11 years 9 months 18 days
Average Book Yield	6.35%
Subordinated Debt [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	3,225
Estimated Fair Value	3,499
Average Maturity (years)	2 years 10 months 24 days
Average Book Yield	5.72%
Preferred Stock [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	7,086
Estimated Fair Value	$ 6,826
Average Maturity (years)	15 years 10 months 24 days
Average Book Yield	6.64%