DEPOSITS - Interest Expenses on deposits (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Expense, Deposits [Abstract]
Interest-bearing checking accounts	$ 5,933	$ 6,071	$ 5,208
Savings	11,116	16,017	14,298
Certificates of deposit	43,350	44,658	33,652
Brokered certificates of deposit	7,989	11,036	14,493
Interest expense on deposits	$ 68,388	$ 77,782	$ 67,651

Aggregate amount of interest expense on all deposits.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.6)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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Amount of interest expense on domestic brokered deposit liabilities.

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Amount of interest expense on domestic checking deposit liabilities.

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Interest expense incurred on all savings account deposits.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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