|**Other Intangibles (Tables)**                           | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                          
|-------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Goodwill and Intangible Assets Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                         
|Schedule of core deposit                                 | The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.September 30, 2017December 31, 2016Gross carrying amount$63,940$61,798Core deposit intangibles acquired18,164Other intangibles acquired3,765Measurement period adjustment2,142Accumulated amortization(52,666)(49,074)Total other intangibles$33,203$14,866
|                                                        
|                                                         |                                                                                                                                                                                                                                                                                                                                                                                         
|                                                         | September 30, 2017                                                                                                                                                                                                                                                                                                                                                                      
|Gross carrying amount                                    | $                                                                                                                                                                                                                                                                                                                                                                                       
|Core deposit intangibles acquired                        | 18,164                                                                                                                                                                                                                                                                                                                                                                                  
|Other intangibles acquired                               | 3,765                                                                                                                                                                                                                                                                                                                                                                                   
|Measurement period adjustment                            |                                                                                                                                                                                                                                                                                                                                                                                         
|Accumulated amortization                                 | (52,666                                                                                                                                                                                                                                                                                                                                                                                 
|Total other intangibles                                  | $                                                                                                                                                                                                                                                                                                                                                                                       
|Schedule of estimated future amortization expense        | Estimated future amortization expense is summarized as follows:Amortization Expense2017$2,05520186,71920195,16920203,63220213,427After 202112,201$33,203                                                                                                                                                                                                                                
|                                                        
|                                                         |                                                                                                                                                                                                                                                                                                                                                                                         
|                                                         | Amortization Expense                                                                                                                                                                                                                                                                                                                                                                    
|2017                                                     | $                                                                                                                                                                                                                                                                                                                                                                                       
|2018                                                     | 6,719                                                                                                                                                                                                                                                                                                                                                                                   
|2019                                                     | 5,169                                                                                                                                                                                                                                                                                                                                                                                   
|2020                                                     | 3,632                                                                                                                                                                                                                                                                                                                                                                                   
|2021                                                     | 3,427                                                                                                                                                                                                                                                                                                                                                                                   
|After 2021                                               | 12,201                                                                                                                                                                                                                                                                                                                                                                                  
|                                                         | $                                                                                                                                                                                                                                                                                                                                                                                       

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