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Earnings Per Share - Components of Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income available to common shareholders $ 13,952us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 8,136us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average number of common shares outstanding - basic 26,777,389us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,686,570us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Share-based compensation plans 1,276,340us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 845,901us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Warrants 284,074us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 242,560us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Weighted-average number of common shares - diluted 28,337,803us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,775,031us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share $ 0.52us-gaap_EarningsPerShareBasic [1] $ 0.30us-gaap_EarningsPerShareBasic [1]
Diluted earnings per share $ 0.49us-gaap_EarningsPerShareDiluted [1] $ 0.29us-gaap_EarningsPerShareDiluted [1]
[1] Earnings per share amounts for the three months ended March 31, 2014 have been adjusted to reflect the 10% stock dividend declared on May 15, 2014 and issued on June 30, 2014.