|**Income Tax**                                             | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|---------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Income Tax Disclosure [Abstract]**                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Income Tax                                                 | Income TaxThree Months EndedJune 30,Six Months EndedJune 30,2015201420152014Income Tax Expense :Currently Payable:Federal$7,658$1,947$7,688$428Deferred:Federal1,0813,8066,7509,832State117135252245Total Income Tax Expense$8,856$5,888$14,690$10,505Reconciliation of Federal Statutory to Actual Tax Expense:Federal statutory income tax at 35%$9,389$7,367$17,091$13,750Tax-exempt interest income(1,738)(1,270)(3,167)(2,495)Basis difference on sale of insurance subsidiary2,2522,252Stock compensation1081821Earnings on life insurance(223)(228)(485)(490)Tax credits(148)(297)(292)(595)Other(686)308(727)314Actual Tax Expense$8,856$5,888$14,690$10,505
|                                                          
|                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                           | Three Months EndedJune 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                           | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Income Tax Expense :                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Currently Payable:                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Federal                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Deferred:                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Federal                                                    | 1,081                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|State                                                      | 117                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Total Income Tax Expense                                   | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Reconciliation of Federal Statutory to Actual Tax Expense: |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Federal statutory income tax at 35%                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Tax-exempt interest income                                 | (1,738                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Basis difference on sale of insurance subsidiary           | 2,252                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Stock compensation                                         | 10                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Earnings on life insurance                                 | (223                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Tax credits                                                | (148                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Other                                                      | (686                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Actual Tax Expense                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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