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INCOME TAX- Differences between effective tax rates and the federal tax rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Differences between effective tax rates and the federal statutory rate applied to income before income taxes      
Federal statutory income tax rate (as a percent) 35.00% 35.00% 35.00%
Federal statutory income tax $ 16,021 $ 12,871 $ 11,082
Tax exempt interest (4,676) (4,425) (4,529)
Effect of state income taxes 169 3,199 111
Non-deductible expenses 193 338 504
Tax exempt income on life insurance (537) (454) (482)
Tax credits (501) (369) (757)
Change in valuation allowance (361) (2,749) 114
Captive insurance premiums (190) (371) (91)
Other 115 (261) (633)
Total income tax expense $ 10,233 $ 7,779 $ 5,319