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Disclosures about Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Cash and cash equivalents, carrying value | $ 212,505 | $ 62,135 |
Cash and cash equivalents, fair value | 212,505 | 62,135 |
Debt securities, available for sale | 577,198 | 663,294 |
Interest-only GNMA securities | 16,272 |  |
Equity securities | 2,406 | 1,718 |
Loans held for sale, carrying value | 486,328 | 1,507 |
Loans held for sale, fair value | 486,328 | 1,507 |
Loans receivable, net of allowance for loan losses, carrying value | 9,508,367 | 8,503,522 |
Loans receivable, net of allowance for loan losses, fair value | 9,853,037 | 8,481,128 |
FHLB, Federal Reserve Bank and other restricted stock, carrying value | 84,214 | 89,685 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 84,214 | 89,685 |
Derivatives | 23,608 | 14,693 |
Liabilities: |  |  |
Deposits, carrying value | 8,648,936 | 7,142,236 | $ 6,800,142
Deposits, fair value | 8,652,340 | 7,136,009 |
Federal funds purchased, carrying value | 538,000 | 187,000 |
Federal funds purchased, fair value | 538,000 | 187,000 |
FHLB advances, carrying value | 850,000 | 1,248,070 |
FHLB advances, fair value | 852,162 | 1,248,046 |
Other borrowings, carrying value | 123,630 | 123,871 |
Other borrowings, fair value | 127,603 | 121,718 |
Subordinated debt, carrying value | 181,115 | 108,977 |
Subordinated debt, fair value | 192,217 | 110,550 |
Derivatives | 45,939 | 16,286 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 212,505 | 62,135 |
Debt securities, available for sale | 0 | 0 |
Interest-only GNMA securities | 0 |  |
Equity securities | 2,406 | 1,718 |
Loans held for sale, fair value | 0 | 0 |
Loans receivable, net of allowance for loan losses, fair value | 0 | 0 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 0 | 0 |
Derivatives | 0 | 0 |
Liabilities: |  |  |
Deposits, fair value | 6,980,402 | 5,408,055 |
Federal funds purchased, fair value | 538,000 | 187,000 |
FHLB advances, fair value | 0 | 998,070 |
Other borrowings, fair value | 0 | 0 |
Subordinated debt, fair value | 0 | 0 |
Derivatives | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 0 | 0 |
Debt securities, available for sale | 577,198 | 663,294 |
Interest-only GNMA securities | 0 |  |
Equity securities | 0 | 0 |
Loans held for sale, fair value | 2,130 | 1,507 |
Loans receivable, net of allowance for loan losses, fair value | 2,245,758 | 1,405,420 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 84,214 | 89,685 |
Derivatives | 23,529 | 14,624 |
Liabilities: |  |  |
Deposits, fair value | 1,671,938 | 1,727,954 |
Federal funds purchased, fair value | 0 | 0 |
FHLB advances, fair value | 852,162 | 249,976 |
Other borrowings, fair value | 127,603 | 121,718 |
Subordinated debt, fair value | 192,217 | 110,550 |
Derivatives | 45,939 | 16,286 |
Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 0 | 0 |
Debt securities, available for sale | 0 | 0 |
Interest-only GNMA securities | 16,272 |  |
Equity securities | 0 | 0 |
Loans held for sale, fair value | 484,198 | 0 |
Loans receivable, net of allowance for loan losses, fair value | 7,607,279 | 7,075,708 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 0 | 0 |
Derivatives | 79 | 69 |
Liabilities: |  |  |
Deposits, fair value | 0 | 0 |
Federal funds purchased, fair value | 0 | 0 |
FHLB advances, fair value | 0 | 0 |
Other borrowings, fair value | 0 | 0 |
Subordinated debt, fair value | 0 | 0 |
Derivatives | $ 0 | $ 0 |

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- Definition Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances, Fair Value Disclosure + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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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=118932676&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=118951113&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 of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + 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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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