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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement of Partners' Capital [Abstract]    
Net income $ 61,188 $ 55,188
Other comprehensive income (loss), before tax:    
Change in net unrealized gain/loss during the period 21,431 (21,344)
Change in net unrealized gain on securities transfered to held-to-maturity (9,198) (8,459)
Change in net unrealized gain on securities transferred to held to maturity (9,198) (8,459)
Reclassification adjustment for net (gains) losses included in net income 0 (5)
Total securities available for sale and transferred securities 12,233 (29,808)
Defined-benefit post-retirement benefit plans:    
Change in the net actuarial gain/loss 672 1,640
Derivatives:    
Change in the accumulated gain/loss on effective cash flow hedge derivatives 0 0
Reclassification adjustments for (gains) losses included in net income:    
Interest rate swaps on variable-rate loans (9,345) (9,345)
Interest rate swap on junior subordinated deferrable interest debentures 0 1,085
Total derivatives (9,345) (8,260)
Other comprehensive income (loss), before tax 3,560 (36,428)
Deferred tax expense (benefit) related to other comprehensive income 1,246 (12,750)
Other comprehensive income (loss), net of tax 2,314 (23,678)
Comprehensive income $ 63,502 $ 31,510