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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains/(losses) arising during the period $ (7,397) $ (9,184) $ 36,780
Less: Reclassification adjustment for losses realized in net income 0 1,866 1,071
Net unrealized gains/(losses) on investment securities (7,397) (7,318) 37,851
Defined benefit plans, Before Tax      
Net actuarial gains/losses arising during the period (963) 687 (7,409)
Amortization of net actuarial losses 1,599 1,688 1,070
Amortization of net transition obligation 17 16 17
Amortization of prior service cost 18 18 18
Settlement 3,847    
Defined benefit plans, net 4,518 2,409 (6,304)
Other comprehensive income (loss) (2,879) (4,909) 31,547
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains/losses arising during the period (2,945) (3,655) 14,714
Less: Reclassification adjustment for gains/losses realized in net income 0 742 426
Net unrealized gains (losses) on investment securities (2,945) (2,913) 15,140
Defined benefit plans, Tax Effect      
Net actuarial gains/losses arising during the period (385) 274 (3,052)
Amortization of net actuarial losses 634 672 441
Amortization of net transition obligation 6 7 7
Amortization of prior service cost 7 7 7
Settlement 1,528    
Defined benefit plans, net 1,790 960 (2,597)
Other comprehensive income (loss) (1,155) (1,953) 12,543
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period (4,452) (5,529) 22,066
Less: Reclassification adjustment for gains/losses realized in net income 0 1,124 645
Net unrealized gains (losses) on investment securities (4,452) (4,405) 22,711
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period (578) 413 (4,357)
Amortization of net actuarial losses 965 1,016 629
Amortization of net transition obligation 11 9 10
Amortization of prior service cost 11 11 11
Settlement 2,319    
Defined benefit plans, net 2,728 1,449 (3,707)
Other comprehensive income (loss), net of tax $ (1,724) $ (2,956) $ 19,004