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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
FINANCIAL ASSETS
Securities held for investment	$ 7,923	$ 8,593
Loans, net of allowance for loan losses	3,815,711	3,810,509
FINANCIAL LIABILITIES
Deposits	5,808,221	5,904,704
Short-term borrowings	2,075	3,982
Junior subordinated debentures	26,804	26,804
Carrying Amount [Member] | Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,817,228	1,913,895
Securities held for investment	7,923	8,593
FINANCIAL LIABILITIES
Deposits	5,808,221	5,904,704
Short-term borrowings	2,075	3,982
Junior subordinated debentures	26,804	26,804
Carrying Amount [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net of allowance for loan losses	3,815,711	3,810,509
Fair Value [Member]
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments	1,666	1,640
Letters of credit	485	478
Fair Value [Member] | Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents	1,817,228	1,913,895
Securities held for investment	7,991	8,671
FINANCIAL LIABILITIES
Deposits	5,131,120	5,945,502
Short-term borrowings	2,075	3,982
Junior subordinated debentures	29,806	31,200
Fair Value [Member] | Level 3 Inputs [Member]
FINANCIAL ASSETS
Loans, net of allowance for loan losses	$ 3,853,964	$ 3,847,791

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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