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Consolidated Statements of Changes in Shareholders’ Equity and Comprehensive Income (unaudited) (USD $)
In Thousands
Common Stock [Member]
Accumulated Deferred Compensation [Member]
Comprehensive Income [Member]
Retained Earnings [Member]
Total
Beginning balance at Dec. 31, 2009$ 366,247$ 2,485$ 3,714$ 133,002$ 505,448
Beginning balance (in Shares) at Dec. 31, 200929,208    
Comprehensive income     
Net income for the period   70,84670,846
Other comprehensive income, net of tax:     
Increase in net unrealized gain on securities available for sale  3,497 3,497
Post-retirement benefit transition obligation amortization  27 27
Total comprehensive income    74,370
Exercise of stock options12,682   12,682
Exercise of stock options (in Shares)305    
Stock option tax benefits917   917
Restricted stock activity194239  433
Restricted stock activity (in Shares)7    
Stock based compensation1,060   1,060
Stock awarded to employees101   101
Stock awarded to employees (in Shares)2    
Purchase and retirement of stock(5,078)  (17,171)(22,249)
Purchase and retirement of stock (in Shares)(404)    
Dividends   (31,589)(31,589)
Ending balance at Sep. 30, 2010376,1232,7247,238155,088541,173
Ending balance (in Shares) at Sep. 30, 201029,118    
Beginning balance at Dec. 31, 2010378,8852,724159163,519545,287
Beginning balance (in Shares) at Dec. 31, 201029,090    
Comprehensive income     
Net income for the period   66,08366,083
Other comprehensive income, net of tax:     
Increase in net unrealized gain on securities available for sale  10,609 10,609
Post-retirement benefit transition obligation amortization  27 27
Total comprehensive income    76,719
Exercise of stock options6,234   6,234
Exercise of stock options (in Shares)150    
Stock option tax benefits6   6
Restricted stock activity455336  791
Restricted stock activity (in Shares)15    
Stock based compensation1,080   1,080
Stock awarded to employees75   75
Stock awarded to employees (in Shares)2    
Purchase and retirement of stock(12,337)  (32,725)(45,062)
Purchase and retirement of stock (in Shares)(956)    
Dividends   (31,142)(31,142)
Ending balance at Sep. 30, 2011$ 374,398$ 3,060$ 10,795$ 165,735$ 553,988
Ending balance (in Shares) at Sep. 30, 201128,301