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Statement Of Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income and expenses:                      
Interest income $ 35,930 $ 34,128 $ 33,814 $ 79,587 [1] $ 33,607 $ 34,426 $ 34,459 $ 92,623 [1] $ 183,459 $ 195,115 $ 193,473
Other income                 2,188 2,091 2,409
Less: Interest expense 5,379 5,556 5,502 6,367 [1] 6,710 7,263 7,630 8,652 [1] 22,804 30,255 36,661
Less: Other expenses                 9,019 7,683 8,325
Income before income tax benefit 10,186 31,572 14,481 127,706 [1] 8,363 11,341 14,110 110,383 [1] 183,945 144,197 98,433
Income tax benefit 3,565 10,904 4,903 45,234 [1] 2,159 3,471 5,447 38,971 [1] 64,606 50,048 33,680
NET INCOME 6,621 20,668 9,578 82,472 [1] 6,204 7,870 8,663 71,412 [1] 119,339 94,149 64,753
Parent Company
                     
Income and expenses:                      
Dividends from subsidiary                 115,476 35,476 15,825
Interest income                 3 81 12
Other income                 39 39 39
Less: Interest expense                 2,522 2,515 2,515
Less: Other expenses                 441 382 373
Income before income tax benefit                 112,555 32,699 12,988
Income tax benefit                 997 961 971
Income before equity in undistributed net income of subsidiaries                 113,552 33,660 13,959
Equity in undistributed net income of subsidiaries                 5,787 60,489 50,794
NET INCOME                 $ 119,339 $ 94,149 $ 64,753
[1] The first quarter of 2012 and 2011 was significantly impacted by the TRS operating division.