Loans Receivable and Credit Quality TDR Loans Restructured or Defaulted in Period (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012 Loans	Sep. 30, 2011 Loans
Troubled debt restructurings current quarter [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	7
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 4,957	$ 3,558
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,957	3,558
Troubled debt restructurings current quarter [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,807	253
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,807	253
Troubled debt restructurings current quarter [Member] | Commercial and industrial [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,800
Troubled debt restructurings current quarter [Member] | Commercial and industrial [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Post-Modification Recorded Investment		300
Troubled debt restructurings current quarter [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	991
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	991
Troubled debt restructurings current quarter [Member] | Commercial real estate [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Post-Modification Recorded Investment		1,000
Troubled debt restructurings current quarter [Member] | Construction and land [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled debt restructurings current quarter [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	5
Financing Receivable, Modifications, Pre-Modification Recorded Investment	3,150	2,314
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,150	2,314
Troubled debt restructurings current quarter [Member] | Residential [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Post-Modification Recorded Investment		2,000
Troubled debt restructurings current quarter [Member] | Residential [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,200	300
Troubled debt restructurings current quarter [Member] | Home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled debt restructurings current quarter [Member] | Consumer and other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Quarter [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,282	1,156
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1,156
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Construction and land [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,282	0
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Quarter [Member] | Consumer and other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings current year [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	20	18
Financing Receivable, Modifications, Pre-Modification Recorded Investment	16,366	37,693
Financing Receivable, Modifications, Post-Modification Recorded Investment	16,447	38,045
Troubled Debt Restructurings current year [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,807	1,937
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,807	1,937
Troubled Debt Restructurings current year [Member] | Commercial and industrial [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,800
Troubled Debt Restructurings current year [Member] | Commercial and industrial [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		3
Financing Receivable, Modifications, Post-Modification Recorded Investment		1,900
Troubled Debt Restructurings current year [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	6	9
Financing Receivable, Modifications, Pre-Modification Recorded Investment	7,387	33,014
Financing Receivable, Modifications, Post-Modification Recorded Investment	7,468	33,366
Troubled Debt Restructurings current year [Member] | Commercial real estate [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	5	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,700	1,000
Troubled Debt Restructurings current year [Member] | Commercial real estate [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		4
Financing Receivable, Modifications, Post-Modification Recorded Investment		13,700
Troubled Debt Restructurings current year [Member] | Commercial real estate [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,800	18,700
Troubled Debt Restructurings current year [Member] | Construction and land [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	428
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	428
Troubled Debt Restructurings current year [Member] | Construction and land [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Post-Modification Recorded Investment		400
Troubled Debt Restructurings current year [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	12	5
Financing Receivable, Modifications, Pre-Modification Recorded Investment	7,172	2,314
Financing Receivable, Modifications, Post-Modification Recorded Investment	7,172	2,314
Troubled Debt Restructurings current year [Member] | Residential [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Post-Modification Recorded Investment		2,000
Troubled Debt Restructurings current year [Member] | Residential [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,900
Troubled Debt Restructurings current year [Member] | Residential [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	10	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,000	300
Troubled Debt Restructurings current year [Member] | Residential [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,300
Troubled Debt Restructurings current year [Member] | Home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled Debt Restructurings current year [Member] | Consumer and other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Year [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,282	2,236
Troubled Debt Restructurings Defaulted Current Year [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	125
Troubled Debt Restructurings Defaulted Current Year [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	2,111
Troubled Debt Restructurings Defaulted Current Year [Member] | Construction and land [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Year [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,282	0
Troubled Debt Restructurings Defaulted Current Year [Member] | Home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Troubled Debt Restructurings Defaulted Current Year [Member] | Consumer and other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0