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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net unrealized gain/loss on investment securities, Before Tax |  |  |  |
Net unrealized gain/loss arising during the period, Before Tax | $ (39,577) | $ 1,696 | $ (44,400) | $ (1,784)
Change in net unrealized gain/loss on investment securities, Before Tax | (39,577) | 1,696 | (44,400) | (1,784)
Net unrealized gain/loss on derivatives, Before Tax |  |  |  |
Reclassification adjustment for gain/loss realized in net income, Before Tax |  | (359) | 394 | (931)
Change in net unrealized gain/loss on derivatives, Before Tax |  | (359) | 394 | (931)
Defined benefit plans, Before Tax |  |  |  |
Amortization of accumulated benefit plan losses, Before Tax | 618 | 580 | 1,234 | 1,160
Amortization of unrecognized transition obligations, Before Tax | 4 | 4 | 8 | 8
Amortization of prior service cost, Before Tax | 5 | 4 | 10 | 9
Change in defined benefit plans, Before Tax | 627 | 588 | 1,252 | 1,177
Change in accumulated other comprehensive income, Before tax | (38,950) | 1,925 | (42,754) | (1,538)
Net unrealized gain/loss on investment securities, Tax |  |  |  |
Net unrealized loss arising during the period, Tax | (16,477) |  | (16,477) |
Change in net unrealized gain/loss on investment securities, Tax | (16,477) |  | (16,477) |
Net unrealized gain/loss on derivatives, Tax |  |  |  |
Reclassification adjustment for gain/loss realized in net income, Tax |  |  | (10,599) |
Change in net unrealized gain/loss on derivatives, Tax |  |  | (10,599) |
Defined benefit plans, Tax |  |  |  |
Amortization of accumulated benefit plan losses, Tax | 248 |  | 248 |
Amortization of unrecognized transition obligations, Tax | 2 |  | 2 |
Amortization of prior service cost, Tax | 2 |  | 2 |
Change in defined benefit plans, Tax | 252 |  | 252 |
Change in accumulated other comprehensive income, Tax | (16,225) |  | (26,824) |
Net unrealized gain/loss on investment securities, Net of Tax |  |  |  |
Net unrealized gain/loss arising during the period, Net of Tax | (23,100) | 1,696 | (27,923) | (1,784)
Change in net unrealized gain/loss on investment securities, Net of Tax | (23,100) | 1,696 | (27,923) | (1,784)
Net unrealized gain/loss on derivatives, Net of Tax |  |  |  |
Reclassification adjustment for gain/loss realized in net income, Net of Tax |  | (359) | 10,993 | (931)
Change in net unrealized gain/loss on derivatives, Net of Tax |  | (359) | 10,993 | (931)
Defined benefit plans, Net of Tax |  |  |  |
Amortization of accumulated benefit plan losses, Net of Tax | 370 | 580 | 986 | 1,160
Amortization of unrecognized transition obligations, Net of Tax | 2 | 4 | 6 | 8
Amortization of prior service cost, Net of Tax | 3 | 4 | 8 | 9
Change in defined benefit plans, Net of Tax | 375 | 588 | 1,000 | 1,177
Change in accumulated other comprehensive income, Net of Tax | $ (22,725) | $ 1,925 | $ (15,930) | $ (1,538)

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