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Selected Quarterly Financial Data (Unaudited) - Summary of the Unaudited Quarterly Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net interest income $ 41,921 $ 40,712 $ 40,630 $ 40,256 $ 42,297 $ 40,832 $ 40,869 $ 40,817 $ 163,519 $ 164,815 $ 156,897
Provision for loan losses 454 (12) 516 300 2,446 233 248 173 1,258 3,100 4,515
Securities transactions 79 90 129 122 272 385 226 4,032 420 4,915 1,598
Noninterest income 22,235 23,652 21,733 22,535 21,800 22,116 20,364 23,437 90,155 87,717 76,961
Noninterest expense 43,854 43,321 42,455 41,944 43,363 42,465 42,563 42,037 171,574 170,428 158,646
Net income $ 13,861 $ 14,491 $ 12,593 $ 13,372 $ 12,306 $ 13,860 $ 11,729 $ 14,005 $ 54,317 $ 51,900 $ 45,621
Net income per common share:                      
Basic $ 0.91 $ 0.94 $ 0.83 $ 0.88 $ 0.81 $ 0.91 $ 0.77 $ 0.93 $ 3.56 $ 3.42 $ 2.99
Diluted $ 0.88 $ 0.93 $ 0.82 $ 0.86 $ 0.79 $ 0.90 $ 0.76 $ 0.91 $ 3.49 $ 3.36 $ 2.93