Income Taxes - Reconciliation of Income Taxes Computed at Federal Statutory Rate to Actual Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax at the federal statutory rate	34.00%	34.00%	34.00%
Return to provision adjustment for 2012 taxable gain on sale of subsidiary	6.34%	0.00%	0.00%
State franchise tax, net of federal tax benefit	5.89%	3.74%	(0.01%)
Officer life insurance	(1.47%)	(1.30%)	(1.45%)
Affordable housing credits	(1.80%)	(1.59%)	(2.03%)
Tax-exempt interest	(7.02%)	(7.74%)	(7.16%)
Other	(0.27%)	2.03%	3.42%
Effective Tax Rate	35.67%	29.14%	26.77%