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Selected Quarterly Financial Data (Details) (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
Summary of the unaudited quarterly results of operations                      
Net interest income $ 42,297 $ 40,832 $ 40,869 $ 40,817 $ 41,384 $ 40,218 $ 38,006 $ 37,289 $ 164,815 $ 156,897 $ 142,757
Provision for loan losses 2,446 233 248 173 829 885 2,013 788 3,100 4,515 2,954
Noninterest income 21,800 22,116 20,364 23,437 19,435 20,117 19,679 17,730 87,717 76,961 69,938
Noninterest expense 43,363 42,465 42,563 42,037 41,380 41,259 39,610 36,397 170,428 158,646 144,095
Net income $ 12,306 $ 13,860 $ 11,729 $ 14,005 $ 11,598 $ 12,553 $ 10,115 $ 11,355 $ 51,900 $ 45,621 $ 42,309
Net income per common share:                      
Basic $ 0.81 $ 0.91 $ 0.77 $ 0.93 $ 0.77 $ 0.82 $ 0.66 $ 0.74 $ 3.42 $ 2.99 $ 2.76
Diluted $ 0.79 $ 0.90 $ 0.76 $ 0.91 $ 0.75 $ 0.81 $ 0.65 $ 0.72 $ 3.36 $ 2.93 $ 2.70