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INVESTMENT SECURITIES - Proceeds from Sales and Calls of Securities and Associated Gross Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains on sales and calls of securities available-for-sale $ 556 $ 5,532 $ 14,768
Gross realized losses on sales and calls of securities available-for-sale (5,408) 0 0
Net realized (losses) gains on sales and calls of securities available-for-sale (4,852) 5,532 14,768
Proceeds from sales and calls of securities available-for-sale $ 1,249,588 $ 1,025,471 $ 1,500,459