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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gain (loss) $ 482         $ 789     $ 482 $ 789 $ 1,306
Interest income 37,133 35,558 34,992 32,595 31,389 31,674 32,479 32,903 140,278 128,445 136,450
Net actuarial losses                 (2,461) (2,381) (2,246)
Net transition obligation                 (17) (17) (18)
Prior service cost                 (18) (17) (18)
Tax (expense) benefit                 112,247    
Net income (loss) 10,295 10,204 14,267 137,309 12,410 10,721 10,812 13,478 172,075 47,421 36,571
Amount Reclassified from AOCI
                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Net income (loss)                 (8,734) (3,312) 2,187
Sale of investment securities available for sale | Amount Reclassified from AOCI
                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gain (loss)                 6,266 (1,382) 1,164
Tax (expense) benefit                 (2,511)    
Net of tax                 3,755 (1,382) 1,164
Unrealized gains (losses) on derivatives | Amount Reclassified from AOCI
                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Interest income                 (394) 434 3,235
Tax (expense) benefit                 (10,599)    
Net of tax                 (10,993) 434 3,235
Amortization of defined benefit plan items | Amount Reclassified from AOCI
                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Net actuarial losses                 (2,461) [1] (2,381) [1] (2,246) [1]
Net transition obligation                 (17) [1] (17) [1] (18) [1]
Prior service cost                 (18) [1] (17) [1] (18) [1]
Reclassification from Accumulated Other Comprehensive Income                 (2,496) (2,415) (2,282)
Tax (expense) benefit                 1,000 51 70
Net of tax                 $ (1,496) $ (2,364) $ (2,212)
[1] (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 14 for additional details).