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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
FINANCIAL ASSETS
Cash and cash equivalents	$ 1,963,106	$ 1,857,535	$ 1,716,052	$ 1,945,148
Securities held for investment	11,269
Loans, net	3,502,346	3,348,112	3,181,303
FINANCIAL LIABILITIES
Deposits	5,737,850	5,419,519	5,174,512
Short-term borrowings	8,603	4,590	4,891
Long-term borrowings	2,000	6,938	11,040
Junior subordinated debentures	26,804	26,804	26,804
Carrying Amount [Member]
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments
Letters of credit
Carrying Amount [Member] | Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,966,106		1,716,052
Securities held for investment	11,269		16,099
FINANCIAL LIABILITIES
Deposits	5,737,850		5,174,512
Short-term borrowings	8,603		4,891
Long-term borrowings	2,000		11,040
Junior subordinated debentures	26,804		26,804
Carrying Amount [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net	3,502,346		3,181,303
Fair Value [Member]
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments	1,712		1,556
Letters of credit	459		469
Fair Value [Member] | Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,966,106		1,716,052
Securities held for investment	11,351		16,317
FINANCIAL LIABILITIES
Deposits	5,538,503		5,200,273
Short-term borrowings	8,603		4,891
Long-term borrowings	1,997		11,010
Junior subordinated debentures	28,948		31,093
Fair Value [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net	$ 3,424,944		$ 3,240,479

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