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Fair Value Measurements (Qualitative Information About Level 3 Assets Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Collateral dependent impaired loans [1]   $ 2,257
Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Collateral dependent impaired loans $ 285 1,448
Loan servicing rights 6,584  
Property acquired through foreclosure or repossession   1,109
Nonrecurring [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Collateral dependent impaired loans 285 1,448
Loan servicing rights $ 6,584  
Property acquired through foreclosure or repossession   $ 1,109
Nonrecurring [Member] | Minimum [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell 0.00% 0.00%
Appraisal adjustments [2] 0.00% 0.00%
Nonrecurring [Member] | Minimum [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell   12.00%
Appraisal adjustments [2]   22.00%
Nonrecurring [Member] | Minimum [Member] | Servicing Contracts [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount rates 10.00%  
Prepayment rates 18.00%  
Nonrecurring [Member] | Maximum [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell 25.00% 20.00%
Appraisal adjustments [2] 100.00% 100.00%
Nonrecurring [Member] | Maximum [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell   12.00%
Appraisal adjustments   22.00%
Nonrecurring [Member] | Maximum [Member] | Servicing Contracts [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount rates 14.00%  
Prepayment rates 39.00%  
Nonrecurring [Member] | Weighted Average [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell 14.00% 5.00%
Appraisal adjustments [2] 43.00% 67.00%
Nonrecurring [Member] | Weighted Average [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount for costs to sell   12.00%
Appraisal adjustments   22.00%
Nonrecurring [Member] | Weighted Average [Member] | Servicing Contracts [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Discount rates 10.00%  
Prepayment rates 20.00%  
[1] The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs. For accruing impaired loans (TDRs for which management has concluded that the collectibility of the loan is not in doubt), the recorded investment also includes accrued interest.
[2] Management may adjust appraisal values to reflect market value declines or other discounts resulting from its knowledge of the property.