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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales and calls of securities available-for-sale $ 1,025,471 $ 1,500,459 $ 4,148,003
Debt Securities      
Debt Securities, Available-for-sale [Line Items]      
Gross realized gains on sales and calls of securities available-for-sale 5,532 14,768 30,919
Gross realized losses on sales and calls of securities available-for-sale 0 0 (1,514)
Net realized gains on sales and calls of securities available-for-sale $ 5,532 $ 14,768 $ 29,405