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DEPOSITS - Scheduled Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Certificates of deposit of $250,000 or less
2019	$ 2,018,605
2020	336,618
2021	27,124
2022	3,542
2023 and After	2,703
Total	2,388,592	$ 1,365,452
Certificates of deposit of more than $250,000
2019	627,100
2020	172,503
2021	8,361
2022	513
2023 and After	805
Total	809,282	$ 560,340
Time Deposits [Abstract]
2019	2,645,705
2020	509,121
2021	35,485
2022	4,055
2023 and After	3,508
Total	$ 3,197,874

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Contractual Maturities, Time Deposits, $250,000 Or More [Abstract]

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Time Deposit Maturities Year Five And Thereafter

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Time Deposits $250,000 Maturities or More, Year Five and Thereafter

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Time Deposits $250,000 Maturities or More, Year Four

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Time Deposits $250,000 Maturities or More, Year One

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Time Deposits $250,000 Maturities or More, Year Three

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Time Deposits $250,000 Maturities or More, Year Two

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Time Deposits, $250,000 Or More

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Time Deposits, Less than $250,000

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Time Deposits Under $250,000 Maturities [Abstract]

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Time Deposits Under $100,000 Maturities, Year Five and Thereafter

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Time Deposits Under $250,000 Maturities, Year Four

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Time Deposits Under $250,000 Maturities, Year One

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Time Deposits Under $250,000 Maturities, Year Three

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Time Deposits Under $250,000 Maturities, Year Two

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Total Certificates Of Deposit [Abstract]

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Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Topic 470
-SubTopic 10
-Section 50
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Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposit liabilities, including certificates of deposit.

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