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Calculation for Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 6,259	$ 7,043	$ 18,392	$ 19,775
Dividends on preferred stock		228	105	683
Net income available to common shareholders	$ 6,259	$ 6,815	$ 18,287	$ 19,092
Weighted average number of common shares outstanding, basic	18,470,348	18,402,764	18,644,679	18,407,173
Convertible preferred stock		1,045,419	223,201	1,046,430
Weighted average number of common shares outstanding, diluted	18,500,975	19,466,126	18,895,909	19,472,136
Basic earnings per common share	$ 0.34	$ 0.37	$ 0.98	$ 1.04
Diluted earnings per common share	$ 0.34	$ 0.36	$ 0.97	$ 1.02
Stock Options
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Stock attributable to share based compensation	26,804	17,375	24,938	18,027
Antidilutive potential common shares	130,382	255,244	130,382	255,244
Restricted Stock
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Stock attributable to share based compensation	3,823	568	3,091	506

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