Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Non Covered	$ 68,373		$ 58,742	$ 61,707		$ 70,454
Other Real Estate, Covered	591		6,817	8,152		22,982
Mortgage servicing rights	17,730	$ 16,824	19,351	$ 19,327	$ 18,162	$ 16,688
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	61,379		64,197
Other Real Estate, Non Covered	45,564		44,571
Other Real Estate, Covered	401		4,403
Mortgage servicing rights	16,688		17,997
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0		0
Other Real Estate, Non Covered	0		0
Other Real Estate, Covered	0		0
Mortgage servicing rights	0		0
Fair Value, Measurements, Nonrecurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0		0
Other Real Estate, Non Covered	0		0
Other Real Estate, Covered	0		0
Mortgage servicing rights	0		0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	61,379		64,197
Other Real Estate, Non Covered	45,564		44,571
Other Real Estate, Covered	401		4,403
Mortgage servicing rights	$ 16,688		$ 17,997