| **Income Tax**                       | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Income Tax Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Income Tax                           | INCOME TAXThe following table summarizes the major components creating differences between income taxes at the federal statutory and the effective tax rate recorded in the consolidated statements of income for the three and six months ended June 30, 2016 and 2015:Three Months EndedJune 30,Six Months EndedJune 30,  2016201520162015Reconciliation of Federal Statutory to Actual Tax Expense:    Federal statutory income tax at 35%$9,353$9,389$17,496$17,091Tax-exempt interest income(2,104)(1,738)(4,130)(3,167)Basis difference on sale of insurance subsidiary2,252 2,252Stock compensation8101318Earnings on life insurance(453)(223)(970)(485)Tax credits(129)(148)(258)(292)Other41(686)139(727)Actual Tax Expense$6,716$8,856$12,290$14,690Effective Tax Rate25.1%33.0%24.6%30.1% |

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| - Definition
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
+ References
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