Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 191,652	$ 200,286
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	4,500	3,800
Fair Value, Measurements, Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,531	3,603
Other loans held for sale	3,295	10,197
Other real estate	1,447	3,363
Other assets held for sale	1,395	5,334
Fair Value, Measurements, Nonrecurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other loans held for sale	0	0
Other real estate	0	0
Other assets held for sale	0	0
Fair Value, Measurements, Nonrecurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other loans held for sale	0	0
Other real estate	0	0
Other assets held for sale	0	0
Fair Value, Measurements, Nonrecurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,531	3,603
Other loans held for sale	3,295	10,197
Other real estate	1,447	3,363
Other assets held for sale	$ 1,395	$ 5,334