Fair Value Measurements (Fair Value Mortgage Loans Held For Sale, Commitments to Originate And Commitments to Sell Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Mortgage Loans Held for Sale, Commitments to Originate And Commitments To Sell [Line Items]
Mortgage loans held for sale	$ 35,409		$ 20,340
Mortgage loans held for sale difference between fair value and principal amount	1,672
Notional or Principal Amount [Member]
Mortgage Loans Held for Sale, Commitments to Originate And Commitments To Sell [Line Items]
Mortgage loans held for sale	33,737	[1]	19,624	[1]
Commitments to originate	102,063		56,950
Commitments to sell	135,799		76,574
Fair Value [Member]
Mortgage Loans Held for Sale, Commitments to Originate And Commitments To Sell [Line Items]
Mortgage loans held for sale	35,409	[1]	20,340	[1]
Commitments to originate	4,873		1,864
Commitments to sell	$ (6,545)		$ (2,580)

[1] At September 30, 2012, the difference between the aggregate fair value and the aggregate principal amount of mortgage loans held for sale amounted to $1.7 million. There were no mortgage loans held for sale 90 days or more past due as of September 30, 2012.