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INCOME AND FRANCHISE TAXES (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current      
Federal $ 1,128 $ 0 $ 0
State (119) (93) (109)
Total 1,009 (93) (109)
Deferred      
Federal 20,061 18,710 (81,613)
State 6,018 1,772 (30,525)
Total 26,079 20,482 (112,138)
Total      
Federal 21,189 18,710 (81,613)
State 5,899 1,679 (30,634)
Total $ 27,088 20,389 (112,247)
Reconciliation between the income tax benefit and the expected tax benefit      
U.S. Federal corporate tax rate 35.00%    
Computed “expected” tax expense (benefit) $ 25,535 21,295 20,940
Increase (decrease) in taxes resulting from:      
Tax-exempt interest (1,420) (1,412) (1,431)
Other tax-exempt income (712) (1,023) (810)
Low-income housing and energy tax credits (1,225) (2,088) (1,557)
State income taxes, net of Federal income tax effect, excluding impact of deferred tax valuation allowance 3,958 2,638 2,389
Change in the beginning-of-the-year balance of the valuation allowance for deferred tax assets allocated to income tax expense (44) (180) (129,806)
Other 996 1,159 (1,972)
Total $ 27,088 $ 20,389 $ (112,247)