Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Taxes [Abstract]

Schedule of reconciliation of the United States federal statutory tax rate to the effective tax rate

	Three Months  Ended September 30,						Nine Months  Ended September 30,
	2012			2011			2012			2011
Tax at U.S. statutory rate		35.00	%		35.00	%		35.00	%		35.00	%
Increase (decrease) in taxes resulting from:
Tax-exempt interest income		(7.58	)		(7.93	)		(8.41	)		(7.71	)
BOLI income		(4.18	)		(2.44	)		(3.30	)		(2.66	)
Investment tax credits, net of amortization		(2.19	)		(0.56	)		(0.72	)		(0.54	)
State income taxes, net of federal benefit		0.31			(0.77	)		(0.03	)		(0.16	)
(Decrease)/increase to valuation allowance		(10.76	)		(1.30	)		(4.21	)		0.54
Other items, net		0.21			4.17			0.81			3.47
Effective tax rate		10.81	%		26.17	%		19.14	%		27.94	%