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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

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