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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net unrealized gains/losses on investment securities, Before Tax        
Net unrealized gains (losses) arising during the period $ 12,561 $ (2,562) $ 3,285 $ 29,323
Less: Reclassification adjustment for gains (losses) realized in net income 0 0 1,866 1,071
Net unrealized gains (losses) on investment securities 12,561 (2,562) 5,151 30,394
Defined benefit plans, Before Tax        
Amortization of net actuarial losses 419 305 1,260 915
Amortization of net transition obligation 4 4 12 12
Amortization of prior service cost 5 5 15 15
Defined benefit plans, net 428 314 1,287 942
Other comprehensive income (loss) 12,989 (2,248) 6,438 31,336
Net unrealized gains/losses on investment securities, Tax Effect        
Net unrealized gains (losses) arising during the period 4,998 (897) 1,306 11,744
Less: Reclassification adjustment for gains (losses) realized in net income 0 0 743 429
Net unrealized gains (losses) on investment securities 4,998 (897) 2,049 12,173
Defined benefit plans, Tax Effect        
Amortization of net actuarial losses 165 100 499 343
Amortization of net transition obligation 2 1 7 5
Amortization of prior service cost 2 1 6 5
Defined benefit plans, net 169 102 512 353
Other comprehensive income 5,167 (795) 2,561 12,526
Net unrealized gains/losses on investment securities, Net of Tax        
Net unrealized gains (losses) arising during the period 7,563 (1,665) 1,979 17,579
Less: Reclassification adjustment for gains (losses) realized in net income 0 0 1,123 642
Net unrealized gains (losses) on investment securities 7,563 (1,665) 3,102 18,221
Defined benefit plans, Net of Tax        
Amortization of net actuarial losses 254 205 761 572
Amortization of net transition obligation 2 3 5 7
Amortization of prior service cost 3 4 9 10
Defined benefit plans, net 259 212 775 589
Total other comprehensive income (loss), net of tax $ 7,822 $ (1,453) $ 3,877 $ 18,810