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DEPOSITS - Scheduled Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Certificates of deposit of $250,000 or less
2018	$ 1,275,449
2019	79,600
2020	5,615
2021	1,401
2022 and After	3,387
Total	1,365,452	$ 1,550,235
Certificates of deposit of more than $250,000
2018	484,034
2019	67,822
2020	5,340
2021	2,394
2022 and After	750
Total	560,340	$ 410,958
Time Deposits [Abstract]
2018	1,759,483
2019	147,422
2020	10,955
2021	3,795
2022 and After	4,137
Total	$ 1,925,792

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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Amount of time deposit liabilities, including certificates of deposit.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC
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