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INCOME AND FRANCHISE TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Allowance for loan and lease losses $ 10,622 $ 19,926
Accrued expenses 294 644
Employee retirement benefits 2,784 6,138
Federal and state tax credit carryforwards 12,473 33,803
Federal and state net operating loss carryforwards 3,306 2,732
Restricted stock and non-qualified stock options 661 412
Premises and equipment 3,633 4,106
Other 3,169 5,060
Total deferred tax assets 36,942 72,821
Deferred tax liabilities    
Intangible assets 4,785 8,138
Other 2,343 3,006
Total deferred tax liabilities 7,128 11,144
Less: Deferred tax valuation allowance 3,321 2,751
Net deferred tax assets 26,493 58,926
Net change in the total valuation allowance (600) 100
Federal    
Income Tax Contingency [Line Items]    
Income tax receivable, current 6,700  
State    
Income Tax Contingency [Line Items]    
Income tax receivable, current $ 6 $ 4