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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
FINANCIAL ASSETS
Cash and cash equivalents	$ 1,720,239	$ 1,945,148	$ 1,763,908	$ 1,707,733
Securities held for investment	14,511
Loans:
Loans (net of unearned interest)	3,245,084	3,242,427	3,065,439
Allowance for loan losses	(38,982)	(38,725)	(37,436)
Loans, net	3,206,102	3,203,702	3,028,003
FINANCIAL LIABILITIES
Deposits	5,150,411	5,440,830	5,099,648
Short-term borrowings	3,522	4,571	6,340
Long-term borrowings	9,964	9,178	11,329
Junior subordinated debentures	26,804	26,804	26,804
Carrying Amount [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,720,239		1,763,908
Securities held for investment	14,511		19,734
Loans:
Loans (net of unearned interest)	3,245,084		3,065,439
Allowance for loan losses	(38,982)		(37,436)
Loans, net	3,206,102		3,028,003
FINANCIAL LIABILITIES
Deposits	5,150,411		5,099,648
Short-term borrowings	3,522		6,340
Long-term borrowings	9,964		11,329
Junior subordinated debentures	26,804		26,804
Fair Value [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,720,239		1,763,908
Securities held for investment	14,654		20,104
Loans:
Loans, net	3,238,652		3,092,725
FINANCIAL LIABILITIES
Deposits	5,175,528		5,121,335
Short-term borrowings	3,522		6,340
Long-term borrowings	9,906		11,431
Junior subordinated debentures	28,991		28,970
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments	1,574		1,321
Letters of credit	$ 437		$ 428

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