Fair Value Measurements (Schedule Of Valuation Methodology And Unobservable Inputs) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Fair Value Measurements [Line Items]
Impaired Loans, Fair Value	$ 34,618
Other Real Estate, Fair Value	2,622
Mortgage Servicing Rights, Fair Value	$ 11,013
Range Four [Member]
Fair Value Measurements [Line Items]
Range of Inputs	8.00%
Minimum [Member] | Range One [Member]
Fair Value Measurements [Line Items]
Range of Inputs	0.00%
Minimum [Member] | Range Two [Member]
Fair Value Measurements [Line Items]
Range of Inputs	3.00%
Minimum [Member] | Range Three [Member]
Fair Value Measurements [Line Items]
Range of Inputs	25.00%
Minimum [Member] | Range Five [Member]
Fair Value Measurements [Line Items]
Range of Inputs	15.00%
Minimum [Member] | Range Six [Member]
Fair Value Measurements [Line Items]
Range of Inputs	7.40%
Minimum [Member] | Range Seven [Member]
Fair Value Measurements [Line Items]
Range of Inputs	2.60%
Maximum [Member] | Range One [Member]
Fair Value Measurements [Line Items]
Range of Inputs	15.00%
Maximum [Member] | Range Two [Member]
Fair Value Measurements [Line Items]
Range of Inputs	8.00%
Maximum [Member] | Range Three [Member]
Fair Value Measurements [Line Items]
Range of Inputs	33.00%
Maximum [Member] | Range Five [Member]
Fair Value Measurements [Line Items]
Range of Inputs	60.00%
Maximum [Member] | Range Six [Member]
Fair Value Measurements [Line Items]
Range of Inputs	25.00%
Maximum [Member] | Range Seven [Member]
Fair Value Measurements [Line Items]
Range of Inputs	4.40%