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Consolidaiton Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 18,093 $ 20,500
Unrealized holding gains (losses) arising during period 12,873 (606)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 238 117
Amortization of net unrealized gains on held-to-maturity securiites (516) (764)
Less: reclassification adjustment for gains included in net income (2,833) (3,737)
Total unrealized gains (losses) on investment securities 9,762 (4,990)
Amortization of net actuarial loss included in net income 903 718
Amortization of prior service cost included in net income 25 24
Total defined benefit pension plans 928 742
Other comprehensive income (loss) 10,690 (4,248)
Comprehensive income $ 28,783 $ 16,252