Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	$ 3,043	$ 3,840
Fair Value, Option, Changes in Fair Value, Gain (Loss)	5,138	2,792
Other Real Estate Owned, Fair Value Disclosure		530
Assets, Fair Value Disclosure	3,043	4,370
Fair Value, Inputs, Level 1 [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
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [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
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	3,043	3,840
Other Real Estate Owned, Fair Value Disclosure		530
Assets, Fair Value Disclosure	3,043	4,370
Collateral dependent loans [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 5,138	2,597
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		$ 195