Income Taxes Major Reasons for the Difference in Effective Income Tax Rate from the Federal Tax Rate (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate Reconciliation
Federal income tax rate at statutory rate	35.00%	35.00%	35.00%
Increases (decreases) resulting from:
Tax-exempt interest and dividends	(4.50%)	(4.90%)	(7.00%)
State income taxes (net of federal income taxes)	2.90%	3.60%	3.80%
Bank owned life insurance	(1.50%)	(1.90%)	(2.80%)
Valuation allowance	0.00%	0.00%	(3.30%)
Federal tax credits	(1.00%)	(1.20%)	(1.70%)
Tax reserve adjustments	(1.90%)	(1.80%)	(0.60%)
Compensation deduction limitations	0.10%	0.40%	0.70%
Other	0.50%	0.50%	(0.30%)
Effective income tax rate	29.60%	29.70%	23.80%