Fair Value Measurements (Details 5) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 180,330	$ 337,965
Interest-earning deposits in financial institutions	107,150	81,705
Securities available-for-sale, Carrying Amount	3,474,560	3,223,830
Securities available‑for‑sale, Fair Value	3,474,560	3,223,830
Investment in FHLB stock, Carrying Amount	22,059	21,870
Investment in FHLB stock, Fair Value	22,059	21,870
Investments carried at cost, Carrying Amount	1,158	1,416
Investments carried at cost, Fair Value	11,719	3,843
Loans and leases held for investment, net, Carrying Amount	175,158	0
Loans held for sale, Fair Value	175,880
Loans and leases, net	15,397,499	15,298,716
Loans and leases held for investment, net	15,611,222
Equity warrants		5,497
Other derivative assets, Carrying Amount	235	694
Demand, interest checking, money market, and savings deposits	14,546,898	13,698,321
Time deposits	2,328,079	2,172,290
Time deposits	2,318,904	2,166,187
Borrowings	217,454	905,812
Borrowings	217,461	905,838
Subordinated debentures	445,743	440,744
Subordinated debentures	429,366	424,507
Derivative liabilities, Carrying Amount		3,285
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	180,330	337,965
Interest-earning deposits in financial institutions	107,150	81,705
Securities available‑for‑sale, Fair Value		2,080
Investment in FHLB stock, Fair Value	0	0
Investments carried at cost, Fair Value	0	0
Demand, interest checking, money market, and savings deposits	0	0
Time deposits	0	0
Borrowings	217,000	591,000
Subordinated debentures	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-earning deposits in financial institutions	0	0
Securities available‑for‑sale, Fair Value		3,156,475
Investment in FHLB stock, Fair Value	22,059	21,870
Investments carried at cost, Fair Value	0	0
Demand, interest checking, money market, and savings deposits	14,546,898	13,698,321
Time deposits	2,318,904	2,166,187
Borrowings	461	314,838
Subordinated debentures	429,366	424,507
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-earning deposits in financial institutions	0	0
Securities available‑for‑sale, Fair Value		65,275
Investment in FHLB stock, Fair Value	0	0
Investments carried at cost, Fair Value	11,719	3,843
Loans and leases held for investment, net	15,604,647
Demand, interest checking, money market, and savings deposits	0	0
Time deposits	0	0
Borrowings	0	0
Subordinated debentures	0	0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available‑for‑sale, Fair Value	3,474,560	3,223,830
Equity warrants	5,452	5,497
Other derivative assets, Fair Value	235	694
Derivative liabilities	2,235	3,285
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available‑for‑sale, Fair Value	3,721	2,080
Equity warrants	0	0
Other derivative assets, Fair Value	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available‑for‑sale, Fair Value	3,404,537	3,156,475
Equity warrants	0	0
Other derivative assets, Fair Value	235	694
Derivative liabilities	2,235	3,285
Fair Value, Measurements, Recurring \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available‑for‑sale, Fair Value	66,302	65,275
Equity warrants	5,452	5,497
Other derivative assets, Fair Value	0	0
Derivative liabilities	0	0
Non Purchased Credit Impaired Loans and Leases \| Fair Value, Measurements, Nonrecurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale, Fair Value	0
Non Purchased Credit Impaired Loans and Leases \| Fair Value, Measurements, Nonrecurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale, Fair Value	175,880
Non Purchased Credit Impaired Loans and Leases \| Fair Value, Measurements, Nonrecurring \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale, Fair Value	0
NonPCI and PCI Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net		15,298,716
Loans and leases held for investment, net		15,494,808
NonPCI and PCI Loans \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net	0	0
NonPCI and PCI Loans \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net	$ 6,575	1,661
NonPCI and PCI Loans \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net		$ 15,493,147

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

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Fair value portion of investments accounted under the cost method.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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No definition available.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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Fair value of securities received as collateral against derivative assets.

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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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Fair value of securities pledged as collateral against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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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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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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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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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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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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No definition available.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The face amount of loans that will be sold to other entities.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Amount of time deposit liabilities, including certificates of deposit.

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Fair value portion of warrants not settleable in cash classified as equity.

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