Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Number of Contracts	41
Recorded Investment	$ 27,309
Real-estate commercial mortage
Financing Receivable, Modifications [Line Items]
Number of Contracts	20
Recorded Investment	16,482
Real-estate commercial mortage | Default [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	1,134
Real-estate commercial mortage | Default [Member] | YTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11
Recorded Investment	11,873
Real-estate commercial mortage | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	8
Recorded Investment	2,702
Commercial - Secured [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	7
Recorded Investment	1,947
Commercial - Secured [Member] | Default [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0
Recorded Investment	0
Commercial - Secured [Member] | Default [Member] | YTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Recorded Investment	23
Commercial - Secured [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	5
Recorded Investment	925
Real-estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Contracts	12
Recorded Investment	3,088
Real-estate - residential mortgage | Default [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Recorded Investment	217
Real-estate - residential mortgage | Default [Member] | YTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	9
Recorded Investment	1,977
Real-estate - residential mortgage | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Recorded Investment	217
Construction - Commercial Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	5,792
Construction - Commercial Residential [Member] | Default [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	5,792
Construction - Commercial Residential [Member] | Default [Member] | YTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	5,792
Construction - Commercial Residential [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	5,792
Default [Member] | QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	5
Recorded Investment	7,143
Default [Member] | YTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	23
Recorded Investment	19,665
QTD [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	16
Recorded Investment	$ 9,636