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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Operating Activities                      
Net earnings $ 28,613 $ 27,886 $ 26,813 $ 15,833 $ 25,581 $ 24,295 $ 25,484 $ 28,661 $ 99,145 $ 104,021 $ 95,608
Adjustments to reconcile net earnings to cash used in operating activities:                      
Stock-based compensation                 2,733 2,988 1,926
Total adjustments                 6,497 (16,319) 16,203
Cash Flows from Financing Activities                      
Repayment of junior subordinated debentures                     (41,238)
Cash dividends on common stock                 (48,862) (42,298) (29,939)
Proceeds from exercise of stock options                 5,144 5,522 4,517
Tax benefit related to exercise of stock options                 308 1,116 475
Repurchase of common stock                 (834) (5,474) (559)
Net increase (decrease) in cash and cash equivalents                 329 11,075 (3,738)
Cash and cash equivalents, beginning of period       105,768       94,693 105,768 94,693 98,431
Cash and cash equivalents, end of period 106,097       105,768       106,097 105,768 94,693
Parent Company [Member]                      
Cash Flows from Operating Activities                      
Net earnings                 99,145 104,021 95,608
Adjustments to reconcile net earnings to cash used in operating activities:                      
Earnings of subsidiaries                 (102,259) (107,119) (96,149)
Tax settlement received from the Bank                 1,233 1,812 1,903
Stock-based compensation                 2,733 2,988 1,926
Other operating activities, net                 (2,180) (3,080) 241
Total adjustments                 (100,473) (105,399) (92,079)
Net cash (used in) provided by operating activities                 (1,328) (1,378) 3,529
Cash Flows from Investing Activities                      
Dividends received from the Bank                 49,000 41,000 63,000
Net cash provided by investing activities                 49,000 41,000 63,000
Cash Flows from Financing Activities                      
Repayment of junior subordinated debentures                 0 0 (41,238)
Cash dividends on common stock                 (48,862) (42,298) (29,939)
Proceeds from exercise of stock options                 5,144 5,522 4,517
Tax benefit related to exercise of stock options                 308 1,116 475
Repurchase of common stock                 (834) (5,474) (559)
Net cash used in financing activities                 (44,244) (41,134) (66,744)
Net increase (decrease) in cash and cash equivalents                 3,428 (1,512) (215)
Cash and cash equivalents, beginning of period       $ 13,532       $ 15,044 13,532 15,044 15,259
Cash and cash equivalents, end of period $ 16,960       $ 13,532       $ 16,960 $ 13,532 $ 15,044