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INCOME AND FRANCHISE TAXES (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ 1,727 $ 805 $ 1,128
State (81) (4) (119)
Total 1,646 801 1,009
Deferred      
Federal 27,263 19,842 20,061
State 4,943 4,585 6,018
Total 32,206 24,427 26,079
Total      
Federal 28,990 20,647 21,189
State 4,862 4,581 5,899
Total $ 33,852 25,228 27,088
Reconciliation between the income tax benefit and the expected tax benefit      
U.S. Federal corporate tax rate 35.00%    
Computed expected tax expense (benefit) $ 26,270 25,260 25,535
Increase (decrease) in taxes resulting from:      
Tax-exempt interest (1,387) (1,410) (1,420)
Other tax-exempt income (1,186) (940) (712)
Low-income housing and energy tax credits (1,135) (899) (946)
State income taxes, net of Federal income tax effect, excluding impact of deferred tax valuation allowance 3,145 2,981 3,834
Change in the beginning-of-the-year balance of the valuation allowance for deferred tax assets allocated to income tax expense 570 (52) (44)
Tax Cuts And Jobs Act of 2017, Change In Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit) 7,440 0 0
Other, net 135 288 841
Total 33,852 25,228 $ 27,088
Income Tax Benefit, Due to Vesting of Restricted Stock 500    
Federal      
Investments, Owned, Federal Income Tax Note [Line Items]      
Income Taxes Receivable 6,700    
Taxes Payable   28  
State      
Investments, Owned, Federal Income Tax Note [Line Items]      
Income Taxes Receivable $ 6 $ 4