Fair Value Measurements (Schedule Of Level Of Valuation Assumptions Used To Determine Each Adjustment And The Carrying Value Of The Related Individual Assets And The Total Losses On A Nonrecurring Basis) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	$ 40,438,000		$ 111,022,000
Loans held-for-sale	760,000		2,873,000
Other real estate owned	80,122,000	[1]	83,264,000	[2]
Investments in venture capital	8,693,000		8,410,000
Equity investments	323,000		522,000
Total assets	130,336,000		206,091,000
Other real estate owned net of disposal costs	92,700,000		71,000,000
Losses on impaired loans	1,743,000		7,116,000		91,009,000
Losses on loans held-for-sale			3,160,000		19,252,000
Losses on other real estate owned	7,003,000	[1]	20,139,000	[1],[2]	28,216,000	[2]
Losses on investments in venture capital	379,000		760,000		1,982,000
Losses on equity investments	200,000		304,000
Total losses on assets	9,325,000		31,479,000		140,459,000
Fair Value Measurements, Level 1 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity investments	323,000		522,000
Total assets	323,000		522,000
Fair Value Measurements, Level 2 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other real estate owned	79,029,000	[1]	72,159,000	[2]
Total assets	79,029,000		72,159,000
Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	40,438,000		111,022,000
Loans held-for-sale	760,000		2,873,000
Other real estate owned	1,093,000	[1]	11,105,000	[2]
Investments in venture capital	8,693,000		8,410,000
Total assets	50,984,000		133,410,000
Commercial Loans [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	4,251,000		4,824,000
Losses on impaired loans	877,000		3,411,000		16,293,000
Commercial Loans [Member] | Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	4,251,000		4,824,000
Construction - Residential [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans			500,000
Losses on impaired loans			1,295,000		23,234,000
Construction - Residential [Member] | Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans			500,000
Construction - Other [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans			5,659,000
Losses on impaired loans					12,493,000
Construction - Other [Member] | Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans			5,659,000
Real Estate Loans [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	35,576,000		99,309,000
Losses on impaired loans	820,000		1,407,000		27,350,000
Real Estate Loans [Member] | Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	35,576,000		99,309,000
Land Loans [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	611,000		730,000
Losses on impaired loans	46,000		1,003,000		11,639,000
Land Loans [Member] | Fair Value Measurements, Level 3 [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total impaired loans	$ 611,000		$ 730,000

[1] Other real estate owned balance of $92.7 million in the consolidated balance sheet is net of estimated disposal costs.

[2] Other real estate owned balance of $71.0 million in the consolidated balance sheet is net of estimated disposal costs.