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INCOME AND FRANCHISE TAXES (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reconciliation between the income tax benefit and the expected tax benefit        
U.S. Federal corporate tax rate (as a percent)     35.00%  
Computed expected tax expense $ 7,097 $ 4,560 $ 12,751 $ 9,924
Increase (decrease) in taxes resulting from:        
Tax-exempt interest (357) (354) (709) (705)
Other tax-exempt income (161) (267) (397) (502)
Income tax credits (313) (675) (640) (870)
State income taxes, net of Federal income tax effect, excluding impact of deferred tax valuation allowance 1,526 573 2,265 1,173
Change in the beginning-of-the-year balance of the valuation allowance for deferred tax assets allocated to income tax expense 1 (3) 19 132
Other 151 43 414 243
Total $ 7,944 $ 3,877 $ 13,703 $ 9,395