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Fair Value Measurements (Schedule Of Valuation Methodology And Unobservable Inputs) (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Other Real Estate Owned [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
OREO $ 166
Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 8.00%
Mortgage Servicing Rights [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Mortgage servicing assets $ 52,075
Mortgage Servicing Rights [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 1.90%
Mortgage Servicing Rights [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 3.60%
Interest Rate Risk [Member] | Mortgage Servicing Rights [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Constant prepayment rate 2.80%
Interest Rate Risk [Member] | Mortgage Servicing Rights [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Constant prepayment rate 27.70%
Nonperforming Financial Instruments [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Collateral dependent impaired loans and leases $ 7,374
Nonperforming Financial Instruments [Member] | Market Approach Valuation Technique - Discount for cost to sell [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 8.00%
Nonperforming Financial Instruments [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 0.00%
Nonperforming Financial Instruments [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 15.00%
Other Real Estate Owned [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rates 0.00%