|**Core Deposit and Other Intangibles (Tables)**          | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                    
|-------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Goodwill and Intangible Assets Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Schedule of core deposit and other intangibles           | The carrying basis and accumulated amortization of recognized core deposit and other intangibles are noted below.September 30, 2016December 31, 2015Gross carrying amount$61,799$58,360Core deposit and other intangibles acquired4,181Accumulated amortization(48,097)(45,164)Measurement period adjustment2,142Core deposit and other intangibles reduction(742)Core deposit and other intangibles$15,844$16,635
|                                                        
|                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                         | September 30, 2016                                                                                                                                                                                                                                                                                                                                                                                                
|Gross carrying amount                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                 
|Core deposit and other intangibles acquired              |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Accumulated amortization                                 | (48,097                                                                                                                                                                                                                                                                                                                                                                                                           
|Measurement period adjustment                            | 2,142                                                                                                                                                                                                                                                                                                                                                                                                             
|Core deposit and other intangibles reduction             |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Core deposit and other intangibles                       | $                                                                                                                                                                                                                                                                                                                                                                                                                 
|Schedule of estimated future amortization expense        | Estimated future amortization expense is summarized as follows:Amortization Expense2016$97820173,61420182,29920191,91420201,733After 20205,306$15,844                                                                                                                                                                                                                                                             
|                                                        
|                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                         | Amortization Expense                                                                                                                                                                                                                                                                                                                                                                                              
|2016                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                 
|2017                                                     | 3,614                                                                                                                                                                                                                                                                                                                                                                                                             
|2018                                                     | 2,299                                                                                                                                                                                                                                                                                                                                                                                                             
|2019                                                     | 1,914                                                                                                                                                                                                                                                                                                                                                                                                             
|2020                                                     | 1,733                                                                                                                                                                                                                                                                                                                                                                                                             
|After 2020                                               | 5,306                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                 

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