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Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Oct. 01, 2014
Dec. 31, 2013
BancShares Plan        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 550,025 $ 544,956   $ 524,017
Actual % of Plan Assets 100.00% 100.00%    
BancShares Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 550,025 $ 544,956    
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 469,647 391,028    
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 80,378 153,928    
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 150,893 155,618 $ 150,374 $ 0
Bancorporation Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 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 126,392 143,938    
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 24,501 11,680    
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]        
Actual % of Plan Assets 5.00% 1.00%    
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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 26,613 $ 3,854    
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 26,613 3,854    
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]        
Actual % of Plan Assets 8.90% 8.40%    
Cash and equivalents | Bancorporation Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 13,437 $ 13,077    
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 13,437 13,077    
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]        
Actual % of Plan Assets 63.00% 62.00%    
Equity Securities | BancShares Plan | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 55.00% 55.00%    
Equity Securities | BancShares Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 65.00% 65.00%    
Equity Securities | BancShares Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 267,037 $ 284,656    
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 267,037 284,656    
Equity Securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0 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]        
Target Allocation 60.00%      
Actual % of Plan Assets 63.00% 69.00%    
Equity Securities | Bancorporation Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 70.00%      
Equity Securities | Bancorporation Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 80,676 $ 101,540    
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 80,676 101,540    
Equity Securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0 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 26.00% 28.00%    
Debt Securities | BancShares Plan | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 25.00% 25.00%    
Debt Securities | BancShares Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 40.00% 40.00%    
Debt Securities | Bancorporation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Actual % of Plan Assets 22.00% 23.00%    
Equity mutual funds | BancShares Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 78,645 $ 52,379    
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 78,645 52,379    
Equity mutual funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0 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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 15,005 5,793    
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 15,005 5,793    
Equity mutual funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0 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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 58,526 23,528    
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 48,957 23,528    
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 9,569 0    
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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 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 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 16,490      
US government and government agency securities | Bancorporation Plan | Fair Value, Inputs, Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0      
Corporate Bonds | BancShares Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 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      
Corporate Bonds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 70,809      
Corporate Bonds | BancShares Plan | Fair Value, Inputs, Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0      
Corporate Bonds | Bancorporation Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 8,011 11,680    
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 8,011 11,680    
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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 17,351 153,928    
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 17,351 0    
Fixed Income Mutual Funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 0 153,928    
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 | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets 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 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      
Fixed Income Mutual Funds | Bancorporation Plan | Fair Value, Inputs, Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 0      
Alternative investments | BancShares Plan        
Defined Benefit Plan Disclosure [Line Items]        
Actual % of Plan Assets 6.00% 9.00%    
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 10.00% 8.00%    
Alternative investments | BancShares Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 31,044 $ 50,139    
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 31,044 50,139    
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]        
Actual % of Plan Assets 6.00%      
Defined Benefit Plan, Target Allocation Percentage 0.05      
Alternative investments | Bancorporation Plan | Fair Value        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 9,090      
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 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      
Alternative investments | Bancorporation Plan | Fair Value, Inputs, Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 0      
Fixed Income And Cash | Bancorporation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Target Allocation 35.00%