Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Examination [Line Items]
U.S. federal tax rate	35.00%	35.00%	35.00%
Net deferred tax assets	$ 66,858,000	$ 17,951,000
Valuation allowance	0	44,821,000
Period of cumulative loss position	3 years
Improved classified asset ratio as a percentage of Tier 1 Capital and the allowance for loan losses	23.00%
Classified asset ratio as a percentage of Tier 1 Capital and the allowance for loan losses	54.10%
Federal tax loss carryforward	42,776,000	44,755,000
Deferred tax assets not related to net operating losses or credits	14,900,000
Alternative minimum tax credits	1,304,000	1,304,000
State tax loss carryforward	7,925,000	8,202,000
Accrued interest and penalties	0
Unrecognized income tax benefit or provision	0
Income taxes related to securities transactions	162,000	2,939,000	471,000
Minimum [Member]
Income Tax Examination [Line Items]
Annual income before taxes	13,000,000
Maximum [Member]
Income Tax Examination [Line Items]
Annual income before taxes	16,000,000
U.S. Federal [Member]
Income Tax Examination [Line Items]
Net deferred tax assets	52,600,000
Alternative minimum tax credits	1,300,000
U.S. Federal [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards expiration	2029
U.S. Federal [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards expiration	2032
State [Member]
Income Tax Examination [Line Items]
Net deferred tax assets	$ 14,300,000
State [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards expiration	2027
State [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards expiration	2032