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DEPOSITS (Deposit Liabilities) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
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.