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Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities without Readily Determinable Fair Value, Amount $ 13,425 $ 0  
Fair Value, Option, Changes in Fair Value, Gain (Loss) (508) 0 $ 0
Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral dependent loans, Fair Value 15,569 10,007  
Other real estate owned, fair value disclosure 525    
Equity Securities without Readily Determinable Fair Value, Amount 13,425    
Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral dependent loans, Fair Value 0 0  
Other real estate owned, fair value disclosure 0    
Equity Securities without Readily Determinable Fair Value, Amount 0    
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral dependent loans, Fair Value 0 0  
Other real estate owned, fair value disclosure 0    
Equity Securities without Readily Determinable Fair Value, Amount 13,425    
Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral dependent loans, Fair Value 15,569 10,007  
Other real estate owned, fair value disclosure 525    
Equity Securities without Readily Determinable Fair Value, Amount 0    
Collateral dependent loans [Domain] | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 8,700 $ 7,519  
Other real estate owned | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 70    
equity securities without readily determinable fair value [Domain] | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (13,425)