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INCOME AND FRANCHISE TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets    
Allowance for loan and lease losses $ 19,926,000 $ 22,275,000
Accrued expenses 644,000 2,555,000
Employee retirement benefits 6,138,000 6,921,000
Federal and state tax credit carryforwards 33,803,000 34,821,000
Interest on nonaccrual loans 493,000 606,000
Federal and state net operating loss carryforwards 2,732,000 19,850,000
Restricted stock and nonqualified stock options 412,000 1,049,000
Premises and equipment 4,106,000 4,269,000
Other 4,567,000 4,958,000
Total deferred tax assets 72,821,000 97,304,000
Deferred tax liabilities    
Intangible assets 8,138,000 10,006,000
Leases 284,000 423,000
Other 2,722,000 2,093,000
Total deferred tax liabilities 11,144,000 12,522,000
Deferred tax valuation allowance 2,751,000 2,803,000
Net deferred tax assets 58,926,000 81,979,000
Net change in the total valuation allowance 100,000 0
Federal    
Income Tax Contingency [Line Items]    
Income tax receivable, current 0 600,000.0
State    
Income Tax Contingency [Line Items]    
Income tax receivable, current $ 0 $ 1,700,000