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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts Reclassified from AOCI                      
Realized gains (losses) on sale of available for sale securities                 $ 38 $ 449 $ (8)
Total reclassifications, before income taxes $ (1,494) $ 14,146 $ 13,346 $ 13,487 $ 13,984 $ 13,514 $ 13,518 $ 13,270 39,485 54,286 31,889
Income tax effect (5,422) [1] (4,703) (4,505) (4,316) (4,824) (4,663) (4,664) (4,644) (18,946) (18,795) (10,778)
Net income $ (6,916) $ 9,443 $ 8,841 $ 9,171 $ 9,160 $ 8,851 $ 8,854 $ 8,626 20,539 35,491 21,111
Amount Reclassified from Accumulated Other Comprehensive Income                      
Amounts Reclassified from AOCI                      
Total reclassifications, before income taxes                 (1,861) (879) (1,023)
Income tax effect                 762 356 414
Net income                 (1,099) (523) (609)
Net securities gains (losses) | Amount Reclassified from Accumulated Other Comprehensive Income                      
Amounts Reclassified from AOCI                      
Realized gains (losses) on sale of available for sale securities                 38 449 (8)
Amortization of defined benefit pension plan and the defined benefit plan component of the SERP | Amount Reclassified from Accumulated Other Comprehensive Income                      
Amounts Reclassified from AOCI                      
Amortization of prior service cost                 77 77 77
Transition obligation                 (27) (28) (27)
Amortization of net loss                 (530) (433) (408)
Realized losses on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income                      
Amounts Reclassified from AOCI                      
Realized gains (losses) on sale of available for sale securities                 $ (1,419) $ (944) $ (657)
[1] 2017 amount includes a charge to write-down deferred tax assets due to the enactment of the Tax Act of $7.6 million.