Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Non Covered	$ 56,142	$ 60,759	$ 55,334	$ 58,742
Other Real Estate, Covered	349	472	9,734	6,817
Mortgage servicing rights	20,771	20,415	$ 17,186	$ 19,351
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	67,235	70,977
Other Real Estate, Non Covered	12,874	44,963
Other Real Estate, Covered	122	439
Mortgage servicing rights		342
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
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
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	67,235	70,977
Other Real Estate, Non Covered	12,874	44,963
Other Real Estate, Covered	$ 122	439
Mortgage servicing rights		$ 342