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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 54,317 $ 51,900 $ 45,621
Adjustments to reconcile to net cash provided by operating activities:      
Amortization of stock-based compensation arrangements 1,360 1,530 3,075
Other, net 5,512 (3,148) 697
Net cash provided by operating activities 78,090 60,296 62,410
INVESTING ACTIVITIES      
Net cash provided by acquisitions     27,741
Net cash (used in) provided by investing activities (131,078) (185,890) 140,403
FINANCING ACTIVITIES      
Issuance of common stock 5,200 3,540 1,398
Common stock acquired (2,710) (256) (10,799)
Cash dividends paid (13,583) (21,090) (15,593)
Redemption of Junior Subordinated Debentures   (9,279)  
Net cash (used in) provided by financing activities (34,625) 363,009 300,841
Net increase in cash (87,613) 237,415 503,654
Cash, due from banks and interest-bearing deposits at the beginning of the period 1,945,148 1,707,733 1,204,079
Cash, due from banks and interest-bearing deposits at the end of the period 1,857,535 1,945,148 1,707,733
SUPPLEMENTAL DISCLOSURE      
Cash paid during the period for interest 14,142 18,312 25,520
Cash received during the period for income taxes, net 20,946 25,975 29,202
Parent Company [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 54,317 51,900 45,621
Adjustments to reconcile to net cash provided by operating activities:      
Equity in undistributed earnings of subsidiaries (34,351) (34,281) (31,856)
Amortization of stock-based compensation arrangements 1,137 1,517 2,999
Other, net (2,116) 2,944 12,402
Net cash provided by operating activities 18,987 22,080 29,166
INVESTING ACTIVITIES      
Net cash provided by acquisitions   19,866 11,748
Purchases of securities     (2)
Sales and maturities of held for investment and available for sale securities 63   28
Other, net     240
Net cash (used in) provided by investing activities 63 19,866 12,014
FINANCING ACTIVITIES      
Issuance of common stock 5,200 3,540 1,398
Common stock acquired (2,710) (256) (10,799)
Cash dividends paid (13,583) (21,090) (15,593)
Redemption of Junior Subordinated Debentures   (9,279)  
Paydown of long-term borrowings     (14,500)
Net cash (used in) provided by financing activities (11,093) (27,085) (39,494)
Net increase in cash 7,957 14,861 1,686
Cash, due from banks and interest-bearing deposits at the beginning of the period 19,635 4,774 3,088
Cash, due from banks and interest-bearing deposits at the end of the period 27,592 19,635 4,774
SUPPLEMENTAL DISCLOSURE      
Cash paid during the period for interest 1,965 2,128 2,818
Cash received during the period for income taxes, net $ 4,449 $ 1,884 $ 1,195