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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
FINANCIAL ASSETS
Cash and cash equivalents	$ 1,826,936	$ 1,945,148	$ 1,912,614	$ 1,707,733
Securities held for investment	12,213
Loans, net	3,320,079	3,203,702	3,078,838
FINANCIAL LIABILITIES
Deposits	5,309,464	5,440,830	5,253,505
Short-term borrowings	5,074	4,571	5,665
Long-term borrowings	8,938	9,178	11,255
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	1,826,936		1,912,614
Securities held for investment	12,213		16,769
FINANCIAL LIABILITIES
Deposits	5,309,464		5,253,505
Short-term borrowings	5,074		5,665
Long-term borrowings	8,938		11,255
Junior subordinated debentures	26,804		26,804
Carrying Amount [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net	3,320,079		3,078,838
Fair Value [Member]
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments	1,378		1,300
Letters of credit	468		458
Fair Value [Member] | Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,826,936		1,912,614
Securities held for investment	12,328		17,080
FINANCIAL LIABILITIES
Deposits	5,338,655		5,275,969
Short-term borrowings	5,074		5,665
Long-term borrowings	8,889		11,333
Junior subordinated debentures	28,927		28,777
Fair Value [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net	$ 3,346,578		$ 3,143,799

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