Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2012 item	Jul. 02, 2012	Jun. 30, 2012	Dec. 31, 2012 Software Y	Dec. 31, 2011 Software Y
Summary of Significant Accounting Policies
Number of offices for delivery of banking, trust and investment services	78
Number of investment advisory affiliates	5
Number of unconsolidated subsidiary	1
Percentage of assets acquired and liabilities assumed	100.00%
Loans
Past due period of interest or principal of loans excluding residential mortgage loans and equity lines of credit placed on nonaccrual status	90 days
Past due period of interest or principal of residential mortgage loans and equity lines of credit placed on nonaccrual status	180 days
Impaired Loans
Charge off of consumer loans, delinquency period for overdrafts, low end of range	60 days
Charge off of consumer loans, delinquency period for secured consumer loans	180 days
Minimum limit for nonperforming loans to be individually evaluated for impairment		$ 1,000,000	$ 500,000
Minimum limit for measuring impairment at the relationship level for borrowers with multiple loans exceeding $1,000,000		$ 1,000,000
Premises and Equipment
Estimated useful life of the software (in years)				5	5