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Fair Value Of Assets and Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And Non-Recurring) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities $ 1,781,883 $ 1,796,076 $ 1,256,768
Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Mortgage servicing rights 8,608 6,750 6,276
Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Impaired loans - collateral based 97,093    
Other real estate owned 142,287    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Mortgage servicing rights 8,608 6,750 6,276
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Impaired loans - collateral based 97,093    
Other real estate owned 142,287    
Impaired Loans [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Other Real Estate Owned [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Significant Unobservable Input Property specific impairment adjustment    
Level 3 Fair Value Measurements Range of Inputs 0%-48%    
Weighted Average of Inputs 1.87%    
Impact to valuation from an increased or higher input value Decrease    
Municipal Bonds [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities 150,647 110,471 99,384
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities 150,647 110,471 99,384
Municipal Bonds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities 32,688 30,770 35,755
Valuation Methodology Bond pricing    
Significant Unobservable Input Equivalent rating    
Level 3 Fair Value Measurements Range of Inputs BBB-AA+    
Impact to valuation from an increased or higher input value Increase    
Equity Securities [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities 49,271 49,699 40,717
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities 49,271 49,699 40,717
Equity Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities $ 20,442 $ 22,169 $ 22,255
Valuation Methodology Discounted cash flows    
Significant Unobservable Input Discount rate    
Level 3 Fair Value Measurements Range of Inputs 1.83%-2.71%    
Weighted Average of Inputs 2.28%    
Impact to valuation from an increased or higher input value Decrease    
Minimum [Member] | Other Real Estate Owned [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 0.00%    
Minimum [Member] | Equity Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 1.83%    
Maximum [Member] | Other Real Estate Owned [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 48.00%    
Maximum [Member] | Equity Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 2.71%    
Mortgage Servicing Rights [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Discounted cash flows    
Mortgage Servicing Rights [Member] | Minimum [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 10.00%    
Fair Value Inputs, Prepayment Rate 11.00%    
Mortgage Servicing Rights [Member] | Maximum [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 13.50%    
Fair Value Inputs, Prepayment Rate 17.00%    
Mortgage Servicing Rights Discount Rate Input [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Discount rate    
Level 3 Fair Value Measurements Range of Inputs 10%-13.5%    
Weighted Average of Inputs 10.17%    
Impact to valuation from an increased or higher input value Decrease    
Mortgage Servicing Rights Prepayment Rate Input [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Constant prepayment rate (CPR)    
Level 3 Fair Value Measurements Range of Inputs 11%-17%    
Weighted Average of Inputs 13.55%    
Impact to valuation from an increased or higher input value Decrease