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INCOME AND FRANCHISE TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets      
Allowance for loan and lease losses   $ 22,275,000 $ 26,052,000
Accrued expenses   2,555,000 2,981,000
Employee retirement benefits   6,921,000 11,023,000
Federal and state tax credit carryforwards   34,821,000 30,593,000
Interest on nonaccrual loans   606,000 1,600,000
Federal and state net operating loss carryforwards   19,850,000 57,173,000
Restricted stock and nonqualified stock options   1,049,000 0
Other   9,227,000 13,357,000
Total deferred tax assets   97,304,000 142,779,000
Deferred tax liabilities      
Intangible assets   10,006,000 11,803,000
FHLB stock dividends received   0 10,742,000
Leases   423,000 1,203,000
Deferred gain on curtailed retirement plan   0 3,315,000
Liability on utilization of state tax credits   0 6,237,000
Other   2,093,000 2,234,000
Total deferred tax liabilities   12,522,000 35,534,000
Deferred tax valuation allowance   2,803,000 2,847,000
Net deferred tax assets   81,979,000 104,398,000
Net change in the total valuation allowance   0 3,900,000
Net impact of reversing the valuation allowance recorded as provision for income tax benefit $ 119,800,000    
Federal      
Income Tax Contingency [Line Items]      
Income tax receivable, current   600,000 $ 0
State      
Income Tax Contingency [Line Items]      
Income tax receivable, current   $ 1,700,000