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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, 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
Quarterly Financial Data [Line Items]                      
Net interest income $ 55,644 $ 59,744 $ 62,960 $ 58,602 $ 55,197 $ 55,980 $ 62,395 $ 57,109 $ 236,950 $ 234,681 $ 259,317
Provision for credit losses                      7,068   7,068 61,200
Net earnings $ 22,136 $ 9,257 $ 23,619 $ 22,268 $ 21,712 $ 22,383 $ 21,038 $ 16,600 $ 77,280 $ 81,733 $ 62,935
Basic earnings per common share $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.21 $ 0.21 $ 0.20 $ 0.16 $ 0.74 $ 0.77 $ 0.59
Diluted earnings per common share $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.21 $ 0.21 $ 0.20 $ 0.16 $ 0.74 $ 0.77 $ 0.59