Loans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 760,000	$ 2,873,000
Decrease in loans held for sale	2,100,000
Sale of loans held for sale	3,600,000	4,300,000
Loans held for sale based on market value		2,900,000
Net gains on sale of loans	3,354,000	149,000	4,761,000
Net gains on sale of loans held for sale	88,000	779,000
Proceeds from sale of loans held for sale	46,377,000	7,481,000	44,597,000
Non-accrual loans held-for-sale	760,000	2,873,000	54,826,000
Charge-offs	(77,626,000)	(138,755,000)	(222,547,000)
Loans serviced for others	222,200,000
Impaired loans, recorded investment	321,973,000	381,992,000
Non-accrual Loans	201,197,000	242,319,000
Average balance of impaired loans	361,353,000	370,638,000
Interest income recognized, impaired loans	5,330,000	9,989,000
Percentage of charge-off to contractual balances for impaired loans	25.60%	23.30%
Accruing TDRs occurred, number of Loans	32	28	14
Decrease in troubled debt restructurings on accrual status	16,800,000
Charge-Offs for accruing TDRs	15,196,000
Accruing TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	120,016,000	136,800,000	54,992,000
Allowance for credit losses associated with TDRs	1,400,000	3,600,000
Non-Accrual TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	50,870,000	28,146,000	41,609,000
Allowance for credit losses associated with TDRs	1,600,000	1,300,000
Six Held For Sale Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		31,700,000
Other Real Estate Owned [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		21,500,000
Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	260,000
Loans serviced for others	60,800,000
Residential Mortgage Loans [Member] | Accruing TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	3,368,000	3,736,000
Residential Mortgage Loans [Member] | Non-Accrual TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	3,498,000	2,328,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	(11,745,000)	(21,609,000)
Loans serviced for others	49,000,000
Non-accrual Loans	30,661,000	31,498,000
Commercial Loans [Member] | Accruing TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	15,120,000	4,025,000
Commercial Loans [Member] | Non-Accrual TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total	3,981,000
Commercial Construction Loan [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	11	8
Troubled debt restructurings, total	74,400,000	64,400,000
Office And Commercial Use Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default	7	6
Troubled debt restructurings, total	23,800,000	20,800,000
Hotel Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default	1
Troubled debt restructurings, total	7,900,000	15,400,000
Accruing TDRs occurred, number of Loans		2
Single Family Residential Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default	10
Troubled debt restructurings, total	13,300,000	10,500,000
Accruing TDRs occurred, number of Loans		4
Multi-Family Residential Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings, total		21,400,000
Accruing TDRs occurred, number of Loans		3
28 Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in troubled debt restructurings on accrual status		81,800,000
Land Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs having payments default	1
Troubled debt restructurings, total	635,000	2,500,000
Accruing TDRs occurred, number of Loans		3
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loans pledged under specific pledge program	250,900,000	286,600,000
Number of TDRs having payments default	2	2
Troubled debt restructurings, total	39,000	1,800,000
TDRs having payments default	930,000
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced for others	111,800,000
TDRs having payments default	26,000
New Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sale of loans held for sale	4,400,000
Proceeds from sale of loans held for sale		20,800,000
Cash [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans held for sale		10,900,000
Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loans pledged under specific pledge program	2,000,000,000	2,400,000,000
Construction - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced for others	$ 600,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan is in period default after, days	90
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan is in period default after, days	60