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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Summary of Advances from FHLB (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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FederalHomeLoanBankAdvancesLineItems |  |
Advances From Federal Home Loan Banks | $ 320,000 | $ 440,000
long term debt [member] |  |
FederalHomeLoanBankAdvancesLineItems |  |
Advances From Federal Home Loan Banks | $ 320,000 | $ 440,000
Federal Home Loan Bank, Advance, Branch of FHLB Bank, Interest Rate, Type [Fixed List] | Fixed |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + 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 Describes the basis for the interest rate (floating or fixed) applicable to the Federal Home Loan Bank advances of the entity as of Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: 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 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. + References No definition available. + Details
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