Income Taxes (Reconciliation of Statutory and Effective Tax Rates) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
Effective tax rate increase (decrease) - State taxes net of federal benefit	1.20%	1.10%	1.30%
Effective tax rate increase (decrease) - Tax-exempt interest	(2.20%)	(1.90%)	(2.30%)
Effective tax rate increase (decrease) - Life insurance	(1.70%)	(1.70%)	(2.30%)
Effective tax rate increase (decrease) - Dividend received deduction	(1.50%)	(1.20%)	(1.60%)
Effective tax rate increase (decrease) - Tax credits	(4.40%)	(3.70%)	(4.60%)
Effective tax rate increase (decrease) - Other	(1.30%)	(1.70%)	0.40%
Effective tax rate	25.10%	25.90%	25.90%