Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets
Total cash and cash equivalents	$ 401,372	$ 105,768	$ 421,386	$ 94,693
Interest-earning balances due from depository institutions	25,873us-gaap_InterestBearingDepositsInBanks	27,118us-gaap_InterestBearingDepositsInBanks
FHLB stock	25,338us-gaap_FederalHomeLoanBankStock	25,338us-gaap_FederalHomeLoanBankStock
Investment securities available-for-sale	3,028,289us-gaap_AvailableForSaleSecurities	3,137,158us-gaap_AvailableForSaleSecurities
Investment securities held-to-maturity	1,464us-gaap_HeldToMaturitySecurities	1,528us-gaap_HeldToMaturitySecurities
Total loans, net of allowance for loan losses	3,655,314	3,757,242
Accrued interest receivable	22,872us-gaap_InterestReceivable	23,194us-gaap_InterestReceivable
Deposits:
Noninterest-bearing	3,126,928	2,866,365
Interest-bearing	2,770,848	2,738,293
Junior subordinated debentures	25,774	25,774
Accrued interest payable	306	1,161
Swaps	571,976us-gaap_DerivativeLiabilities	573,707us-gaap_DerivativeLiabilities
Carrying Value [Member]
Assets
Total cash and cash equivalents	401,372	105,768
Interest-earning balances due from depository institutions	25,873	27,118
FHLB stock	25,338	25,338
Investment securities available-for-sale	3,028,289	3,137,158
Investment securities held-to-maturity	1,464	1,528
Loans held-for-sale	0	0
Total loans, net of allowance for loan losses	3,655,314	3,757,242
Accrued interest receivable	22,872	23,194
Swaps	11,624	10,080
Deposits:
Noninterest-bearing	3,126,928	2,866,365
Interest-bearing	2,770,848	2,738,293
Borrowings	560,352	809,106
Junior subordinated debentures	25,774	25,774
Accrued interest payable	306	1,161
Swaps	11,624	10,080
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	401,372	105,768
Interest-earning balances due from depository institutions	25,873	27,118
FHLB stock	25,338	25,338
Investment securities available-for-sale	3,028,289	3,137,158
Investment securities held-to-maturity	2,040	2,177
Loans held-for-sale	0	0
Total loans, net of allowance for loan losses	3,704,042	3,794,454
Accrued interest receivable	22,872	23,194
Swaps	11,624	10,080
Deposits:
Noninterest-bearing	3,126,928	2,866,365
Interest-bearing	2,771,030	2,739,221
Borrowings	560,291	822,607
Junior subordinated debentures	26,016	26,005
Accrued interest payable	306	1,161
Swaps	11,624	10,080
Estimated Fair Value [Member] \| Level 1 [Member]
Assets
Total cash and cash equivalents	401,372	105,768
Interest-earning balances due from depository institutions	0	0
FHLB stock	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Loans held-for-sale	0	0
Total loans, net of allowance for loan losses	0	0
Accrued interest receivable	0	0
Swaps	0	0
Deposits:
Noninterest-bearing	3,126,928	2,866,365
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Accrued interest payable	0	0
Swaps	0	0
Estimated Fair Value [Member] \| Level 2 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	25,873	27,118
FHLB stock	25,338	25,338
Investment securities available-for-sale	3,028,289	3,137,158
Investment securities held-to-maturity	0	0
Loans held-for-sale	0	0
Total loans, net of allowance for loan losses	0	0
Accrued interest receivable	22,872	23,194
Swaps	11,624	10,080
Deposits:
Noninterest-bearing	0	0
Interest-bearing	2,771,030	2,739,221
Borrowings	560,291	822,607
Junior subordinated debentures	26,016	26,005
Accrued interest payable	306	1,161
Swaps	11,624	10,080
Estimated Fair Value [Member] \| Level 3 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	0	0
FHLB stock	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	2,040	2,177
Loans held-for-sale	0	0
Total loans, net of allowance for loan losses	3,704,042	3,794,454
Accrued interest receivable	0	0
Swaps	0	0
Deposits:
Noninterest-bearing	0	0
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Accrued interest payable	0	0
Swaps	$ 0	$ 0

Borrowings.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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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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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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