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DEPOSITS (Deposit Liabilities) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Deposits: |  |  |
Non-interest-bearing accounts |  | $ 5,994,693,000 | $ 5,492,924,000
Interest-bearing checking |  | 1,722,085,000 | 1,569,435,000
Regular savings accounts |  | 2,597,731,000 | 2,398,482,000
Money market accounts |  | 2,327,380,000 | 2,191,135,000
Total interest-bearing transaction and saving accounts |  | 6,647,196,000 | 6,159,052,000
Certificates of deposit less than or equal to $250,000 |  | 711,424,000 | 718,256,000
Certificates of deposit greater than $250,000 |  | 195,554,000 | 197,064,000
Total certificates of deposit | [1] | 906,978,000 | 915,320,000
Total deposits |  | 13,548,867,000 | 12,567,296,000
Included in total deposits: |  |  |
Public fund transaction and savings accounts |  | 321,042,000 | 302,875,000
Public fund interest-bearing certificates |  | 51,021,000 | 59,127,000
Total public deposits |  | 372,063,000 | 362,002,000
Total brokered deposits |  | 0 | 0
CD acquisition premium |  | $ 34,000 | $ 58,000
[1] | Certificates of deposit include $34,000 and $58,000 of acquisition premiums at March 31, 2021 and December 31, 2020, respectively.

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