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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
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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

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