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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net earnings $ 77,280 $ 81,733 $ 62,935
Adjustments to reconcile net earnings to cash used in by operating activities:      
Stock based compensation 2,039 2,214 2,197
Total adjustments 77,481 48,285 39,930
Net cash provided by (used in) operating activities 154,761 130,018 102,865
CASH FLOWS FROM INVESTING ACTIVITIES:      
Net cash (used in) provided by investing activities (221,088) (86,663) 550,435
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends on common stock (44,552) (35,805) (36,103)
Proceeds from exercise of stock options 2,557 59 1,547
Tax benefit from exercise of stock options 194 1 425
Repurchase of common stock (54) (12,527) (5,169)
Net cash used in financing activities (180,585) (102,287) (352,279)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (246,912) (58,932) 301,021
CASH AND CASH EQUIVALENTS, beginning of period 345,343 404,275 103,254
CASH AND CASH EQUIVALENTS, end of period 98,431 345,343 404,275
Parent Company [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net earnings 77,280 81,733 62,935
Adjustments to reconcile net earnings to cash used in by operating activities:      
Earnings of subsidiaries (81,039) (88,750) (68,378)
Tax settlement received from the Bank 5,240   3,377
Stock based compensation 2,039 2,214 2,197
Other operating activities, net (1,717) (8,105) (3,586)
Total adjustments (75,477) (94,641) (66,390)
Net cash provided by (used in) operating activities 1,803 (12,908) (3,455)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Dividends received from the Bank 82,300 68,000 43,100
Net cash (used in) provided by investing activities 82,300 68,000 43,100
CASH FLOWS FROM FINANCING ACTIVITIES      
Repayment of junior subordinated debentures (48,043)    
Cash dividends on common stock (44,552) (35,805) (36,103)
Proceeds from exercise of stock options 2,557 59 1,547
Tax benefit from exercise of stock options 194 1 425
Repurchase of common stock (54) (12,527) (5,169)
Net cash used in financing activities (89,898) (48,272) (39,300)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (5,795) 6,820 345
CASH AND CASH EQUIVALENTS, beginning of period 21,054 14,234 13,889
CASH AND CASH EQUIVALENTS, end of period $ 15,259 $ 21,054 $ 14,234