Past Due Loans, Allowance For Credit Losses, Impaired Loans and TDRS (Details) - TDRs That Defaulted Within Twelve Months of the Restructured Date (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs That Defaulted Within Twelve Months of the Restructured Date [Line Items]
Number of Loans	0	2
Recorded Investment	$ 0	$ 125
Commercial And Industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs That Defaulted Within Twelve Months of the Restructured Date [Line Items]
Number of Loans	0	2
Recorded Investment	$ 0	$ 125