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Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Bancorporation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 151,067 $ 168,591 $ 152,084
Actual % of Plan Assets 100.00% 100.00%  
Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 115,974 $ 126,709  
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 35,093 41,882  
Bancorporation Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 2,793 $ 3,941  
Actual % of Plan Assets 1.85% 2.34%  
Bancorporation Plan | Cash and equivalents | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
Bancorporation Plan | Cash and equivalents | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 5.00% 5.00%  
Bancorporation Plan | Cash and equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 2,793 $ 3,941  
Bancorporation Plan | Cash and equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Cash and equivalents | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 26,639 $ 26,892  
Actual % of Plan Assets 66.00% 70.00%  
Bancorporation Plan | Equity securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
Bancorporation Plan | Equity securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 70.00% 70.00%  
Bancorporation Plan | Equity securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 26,639 $ 26,892  
Bancorporation Plan | Equity securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Equity securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 0 $ 0  
Bancorporation Plan | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Actual % of Plan Assets 27.00% 25.00%  
Bancorporation Plan | Debt Securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 15.00% 15.00%  
Bancorporation Plan | Debt Securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 45.00% 45.00%  
Bancorporation Plan | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 74,305 $ 90,466  
Bancorporation Plan | Equity mutual funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 73,850 84,954  
Bancorporation Plan | Equity mutual funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 455 5,512  
Bancorporation Plan | Equity mutual funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | US government and government agency securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 13,749 15,798  
Bancorporation Plan | US government and government agency securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | US government and government agency securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 13,749 15,798  
Bancorporation Plan | US government and government agency securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 20,889 20,572  
Bancorporation Plan | Corporate Bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 20,889 20,572  
Bancorporation Plan | Corporate Bonds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Fixed Income Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 5,748 5,163  
Bancorporation Plan | Fixed Income Mutual Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 5,748 5,163  
Bancorporation Plan | Fixed Income Mutual Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Fixed Income Mutual Funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Alternative investments      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 6,944 $ 5,759  
Actual % of Plan Assets 5.00% 3.00%  
Bancorporation Plan | Alternative investments | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
Bancorporation Plan | Alternative investments | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
Bancorporation Plan | Alternative investments | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 6,944 $ 5,759  
Bancorporation Plan | Alternative investments | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
Bancorporation Plan | Alternative investments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 691,467 $ 712,999 $ 600,616
Actual % of Plan Assets 100.00% 100.00%  
Employer contributions $ 50,000 $ 50,000  
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 504,684 547,193  
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 186,783 165,806  
BancShares Plan | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 16,236 $ 67,084  
Actual % of Plan Assets 2.00% 9.00%  
BancShares Plan | Cash and equivalents | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
BancShares Plan | Cash and equivalents | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 5.00% 5.00%  
BancShares Plan | Cash and equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 16,236 $ 67,084  
BancShares Plan | Cash and equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Cash and equivalents | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 117,300 $ 76,920  
Actual % of Plan Assets 64.00% 65.00%  
BancShares Plan | Equity securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
BancShares Plan | Equity securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 70.00% 70.00%  
BancShares Plan | Equity securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 117,300 $ 76,920  
BancShares Plan | Equity securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Equity securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 0 $ 0  
BancShares Plan | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Actual % of Plan Assets 30.00% 23.00%  
BancShares Plan | Debt Securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 15.00% 15.00%  
BancShares Plan | Debt Securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 45.00% 45.00%  
BancShares Plan | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 321,023 $ 381,747  
BancShares Plan | Equity mutual funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 319,254 360,175  
BancShares Plan | Equity mutual funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,769 21,572  
BancShares Plan | Equity mutual funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | US government and government agency securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 65,545 60,663  
BancShares Plan | US government and government agency securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | US government and government agency securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 65,545 60,663  
BancShares Plan | US government and government agency securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 119,469 83,571  
BancShares Plan | Corporate Bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 119,469 83,571  
BancShares Plan | Corporate Bonds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Fixed Income Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 23,813 20,497  
BancShares Plan | Fixed Income Mutual Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 23,813 20,497  
BancShares Plan | Fixed Income Mutual Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Fixed Income Mutual Funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Alternative investments      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 28,081 $ 22,517  
Actual % of Plan Assets 4.00% 3.00%  
BancShares Plan | Alternative investments | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 0.00% 0.00%  
BancShares Plan | Alternative investments | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
BancShares Plan | Alternative investments | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 28,081 $ 22,517  
BancShares Plan | Alternative investments | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0 0  
BancShares Plan | Alternative investments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 0 $ 0