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Calculation for Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 6,175	$ 7,007	$ 12,133	$ 12,732
Dividends on preferred stock		227	105	455
Net income available to common shareholders	$ 6,175	$ 6,780	$ 12,028	$ 12,277
Weighted average number of common shares outstanding, basic	18,831,742	18,395,996	18,733,288	18,409,414
Convertible preferred stock		1,045,419	336,651	1,046,944
Weighted average number of common shares outstanding, diluted	18,860,119	19,457,237	19,095,408	19,475,333
Basic earnings per common share	$ 0.33	$ 0.37	$ 0.64	$ 0.67
Diluted earnings per common share	$ 0.33	$ 0.36	$ 0.64	$ 0.65
Stock Option
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Stock attributable to share based compensation	24,389	15,577	22,914	18,467
Antidilutive potential common shares	136,382	253,082	136,382	253,082
Restricted Stock
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Stock attributable to share based compensation	3,988	245	2,555	508

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Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]

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