Loans (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 1,276,000		$ 2,873,000
Sale of loans held-for-sale	2,400,000
Net gains on sale of loans	109,000	2,851,000	149,000
Percentage of charge-off to contractual balances for impaired loans		23.60%		23.30%
Charge-Offs for accruing TDRs		13,400,000		333,000
Charge-off in case of TDRs that subsequently got defaulted		361,000
Impaired loans, recorded investment		320,260,000		381,992,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan is in period default after, days		90
Maximum [Member] | Residential Mortgage Loans [Member] | Reduction Of Stated Interest Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Periods' range for modifications involving reduction of stated interest rate of accruing troubled debt restructurings		4
Maximum [Member] | Reduction Of Stated Interest Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Periods' range for modifications involving reduction of stated interest rate of accruing troubled debt restructurings		5
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan is in period default after, days		60
Minimum [Member] | Residential Mortgage Loans [Member] | Reduction Of Stated Interest Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Periods' range for modifications involving reduction of stated interest rate of accruing troubled debt restructurings		9
Minimum [Member] | Reduction Of Stated Interest Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Periods' range for modifications involving reduction of stated interest rate of accruing troubled debt restructurings		6
Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs having payments default		2,900,000
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		3,233,000		3,736,000
Residential Mortgage Loans [Member] | Non-Accrual Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		3,390,000		2,328,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		776,000
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		15,266,000		4,025,000
Commercial Loans [Member] | Non-Accrual Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		4,124,000		2,310,000
Construction Loans- Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		500,000
Retail Shopping And Commercial Use Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		10
Troubled debt restructurings, total		71,600,000
Office And Commercial Use Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		8
Troubled debt restructurings, total		27,600,000
Hotel Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		2
Troubled debt restructurings, total		13,200,000
Single Family Residential Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		8
Troubled debt restructurings, total		13,100,000
Land Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		1
Troubled debt restructurings, total		724,000
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default		2
Troubled debt restructurings, total		45,000
TDRs having payments default		932,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs having payments default		1,300,000
Accruing Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		126,270,000		136,800,000
Allowance for credit losses associated with TDRs		2,100,000		3,600,000
Non-Accrual Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		44,075,000		28,146,000
Allowance for credit losses associated with TDRs		$ 1,200,000		$ 1,300,000