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Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 600,616 $ 550,025 $ 544,956
Actual % of Plan Assets 100.00% 100.00%  
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 517,858 $ 469,647  
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 82,758 80,378  
BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 152,084 150,893 $ 155,618
Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 124,940 126,392  
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 27,144 24,501  
Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Cash and equivalents | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 60,674 $ 26,613  
Actual % of Plan Assets 10.00% 5.00%  
Cash and equivalents | BancShares Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
Cash and equivalents | BancShares Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 1.00% 1.00%  
Cash and equivalents | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 60,674 $ 26,613  
Cash and equivalents | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Cash and equivalents | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Cash and equivalents | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 3,839 $ 13,437  
Actual % of Plan Assets 2.49% 8.90%  
Cash and equivalents | Bancorporation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00%    
Cash and equivalents | Bancorporation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 1.00%    
Cash and equivalents | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 3,839 $ 13,437  
Cash and equivalents | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Cash and equivalents | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Equity Securities | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 66,015 $ 267,037  
Actual % of Plan Assets 54.00% 63.00%  
Equity Securities | BancShares Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 55.00%  
Equity Securities | BancShares Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 70.00% 65.00%  
Equity Securities | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 65,964 $ 267,037  
Equity Securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 51 0  
Equity Securities | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Equity Securities | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 18,274 $ 80,676  
Target Allocation 60.00%    
Actual % of Plan Assets 58.00% 63.00%  
Equity Securities | Bancorporation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00%    
Equity Securities | Bancorporation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 70.00%    
Equity Securities | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 18,260 $ 80,676  
Equity Securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 14 0  
Equity Securities | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 0 $ 0  
Debt Securities | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Actual % of Plan Assets 28.00% 26.00%  
Debt Securities | BancShares Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 15.00% 25.00%  
Debt Securities | BancShares Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 45.00% 40.00%  
Debt Securities | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Actual % of Plan Assets 31.00% 22.00%  
Debt Securities | Bancorporation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 15.00%    
Debt Securities | Bancorporation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 45.00%    
Equity mutual funds | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 256,976 $ 78,645  
Equity mutual funds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 252,710 78,645  
Equity mutual funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4,266 0  
Equity mutual funds | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Equity mutual funds | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 69,978 15,005  
Equity mutual funds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 68,832 15,005  
Equity mutual funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,146 0  
Equity mutual funds | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
US government and government agency securities | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 57,890 58,526  
US government and government agency securities | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 47,647 48,957  
US government and government agency securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 10,243 9,569  
US government and government agency securities | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
US government and government agency securities | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 15,407 20,476  
US government and government agency securities | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 8,919 3,986  
US government and government agency securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 6,488 16,490  
US government and government agency securities | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Corporate Bonds | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 68,198 70,809  
Corporate Bonds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Corporate Bonds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 68,198 70,809  
Corporate Bonds | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Corporate Bonds | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 19,496 8,011  
Corporate Bonds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Corporate Bonds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 19,496 8,011  
Corporate Bonds | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Fixed Income Mutual Funds | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 42,849 17,351  
Fixed Income Mutual Funds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 42,849 17,351  
Fixed Income Mutual Funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Fixed Income Mutual Funds | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Fixed Income Mutual Funds | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 11,822 4,198  
Fixed Income Mutual Funds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 11,822 4,198  
Fixed Income Mutual Funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Fixed Income Mutual Funds | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Alternative investments | BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 48,014 $ 31,044  
Actual % of Plan Assets 8.00% 6.00%  
Alternative investments | BancShares Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
Alternative investments | BancShares Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 8.00%  
Alternative investments | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 48,014 $ 31,044  
Alternative investments | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Alternative investments | BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Alternative investments | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 13,268 9,090  
Actual % of Plan Assets 9.00%    
Defined Benefit Plan, Target Allocation Percentage 0.05    
Alternative investments | Bancorporation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00%    
Alternative investments | Bancorporation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00%    
Alternative investments | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 13,268 9,090  
Alternative investments | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Alternative investments | Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 0 $ 0  
Fixed Income And Cash | Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 35.00%