Regulatory Capital (Details)	Sep. 30, 2012
Regulatory Capital Details
Tier I capital to total average assets, Bank (as a percentage)	9.21%
Tier I capital to risk-weighted assets, Bank (as a percentage)	12.64%
Total capital to risk-weighted assets, Bank (as a percentage)	13.90%
Tier I capital to total average assets, Regulatory Requirement (as a percentage)	8.00%
Tier I capital to risk-weighted assets, Regulatory Requirement (as a percentage)	4.00%
Total capital to risk-weighted assets, Regulatory Requirement (as a percentage)	12.00%