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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Carrying Amount | $ 251,726 | $ 146,323 | $ 413,242 | $ 264,709
Cash and cash equivalents, Estimated Fair Value | 251,726 | 146,323 |  |
Debt securities, available for sale | 1,157,944 |  |  |
Debt securities, available for sale, Estimated Fair Value | 1,157,944 |  |  |
Investment securities, at fair value | 1,161,000 | 471,371 |  |
Investments securities, available for sale, fair value |  | 471,371 |  |
Equity securities, carrying amount | 3,056 |  |  |
Equity securities, Estimated Fair Value | 3,056 |  |  |
Loans held for sale, Carrying Amount | 1,043 | 146,077 |  |
Loans held for sale, Estimated Fair Value | 1,043 | 146,251 |  |
Loans receivable, net of allowance for loan losses, Carrying Amount | 9,074,176 | 8,523,651 |  |
Loans receivable, net of allowance for loan losses, Estimated Fair Value | 9,058,053 | 8,470,171 |  |
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount | 136,066 | 105,918 |  |
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 136,066 | 105,918 |  |
Derivative assets | 16,247 | 9,752 |  |
Deposits, Carrying Amount | 7,295,954 | 6,800,142 |  |
Deposits, Estimated Fair Value | 7,288,828 | 6,796,095 |  |
Federal funds purchased, Carrying Amount | 105,000 | 155,000 |  |
Federal funds purchased, Estimated Fair Value | 105,000 | 155,000 |  |
FHLB advances, Carrying Amount | 2,389,797 | 1,611,860 |  |
FHLB advances, Estimated Fair Value | 2,389,785 | 1,611,603 |  |
Other borrowings, Carrying Amount | 186,888 | 186,497 |  |
Other borrowings, Estimated Fair Value | 185,364 | 193,557 |  |
Subordinated debt, Carrying Amount | 108,929 | 108,880 |  |
Subordinated debt, Estimated Fair Value | 114,675 | 115,775 |  |
Derivative liabilities | 13,698 | 10,074 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Estimated Fair Value | 251,726 | 146,323 |  |
Debt securities, available for sale, Estimated Fair Value | 0 |  |  |
Investments securities, available for sale, fair value |  | 3,352 |  |
Equity securities, Estimated Fair Value | 3,056 |  |  |
Loans held for sale, Estimated Fair Value | 0 | 0 |  |
Loans receivable, net of allowance for loan losses, Estimated Fair Value | 0 | 0 |  |
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0 |  |
Derivative assets | 0 | 0 |  |
Deposits, Estimated Fair Value | 5,223,793 | 4,894,449 |  |
Federal funds purchased, Estimated Fair Value | 105,000 | 155,000 |  |
FHLB advances, Estimated Fair Value | 1,504,797 | 881,860 |  |
Other borrowings, Estimated Fair Value | 63,554 | 65,072 |  |
Subordinated debt, Estimated Fair Value | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0 |  |
Debt securities, available for sale, Estimated Fair Value | 1,157,944 |  |  |
Investments securities, available for sale, fair value |  | 468,019 |  |
Equity securities, Estimated Fair Value | 0 |  |  |
Loans held for sale, Estimated Fair Value | 1,043 | 1,886 |  |
Loans receivable, net of allowance for loan losses, Estimated Fair Value |  | 1,793,408 |  |
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 136,066 | 105,918 |  |
Derivative assets | 16,114 | 9,692 |  |
Deposits, Estimated Fair Value | 2,065,035 | 1,901,646 |  |
Federal funds purchased, Estimated Fair Value | 0 | 0 |  |
FHLB advances, Estimated Fair Value | 884,988 | 729,743 |  |
Other borrowings, Estimated Fair Value | 121,810 | 128,485 |  |
Subordinated debt, Estimated Fair Value | 114,675 | 115,775 |  |
Derivative liabilities | 13,698 | 10,074 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0 |  |
Debt securities, available for sale, Estimated Fair Value | 0 |  |  |
Investments securities, available for sale, fair value |  | 0 |  |
Equity securities, Estimated Fair Value | 0 |  |  |
Loans held for sale, Estimated Fair Value | 0 | 144,365 |  |
Loans receivable, net of allowance for loan losses, Estimated Fair Value | 7,127,315 | 6,676,763 |  |
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0 |  |
Derivative assets | 133 | 60 |  |
Deposits, Estimated Fair Value | 0 | 0 |  |
Federal funds purchased, Estimated Fair Value | 0 | 0 |  |
FHLB advances, Estimated Fair Value | 0 | 0 |  |
Other borrowings, Estimated Fair Value | 0 | 0 |  |
Subordinated debt, Estimated Fair Value | 0 | 0 |  |
Derivative liabilities | $ 0 | $ 0 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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