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DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Other Assets
Derivatives, Fair Value [Line Items]
Notional Amount Assets	$ 70,486,000	$ 877,695,000
Derivatives asset, fair values	1,005,000	17,968,000
Other Assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	0	289,637,000
Derivatives asset, fair values	0	8,317,000
Other Assets | Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	0	537,476,000
Derivatives asset, fair values	0	8,897,000
Other Assets | Interest rate swaps and cap on loans
Derivatives, Fair Value [Line Items]
Notional Amount Assets	70,486,000	46,346,000
Derivatives asset, fair values	1,005,000	707,000
Other Assets | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount Assets	0	4,236,000
Derivatives asset, fair values	0	47,000
Accrued Expenses and Other Liabilities
Derivatives, Fair Value [Line Items]
Notional Amount Liability	70,486,000	338,820,000
Derivatives liability, fair values	1,033,000	2,116,000
Accrued Expenses and Other Liabilities | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	0	22,945,000
Derivatives liability, fair values	0	231,000
Accrued Expenses and Other Liabilities | Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	0	265,322,000
Derivatives liability, fair values	0	1,212,000
Accrued Expenses and Other Liabilities | Interest rate swaps and caps on loans
Derivatives, Fair Value [Line Items]
Notional Amount Liability	70,486,000	46,346,000
Derivatives liability, fair values	1,033,000	655,000
Accrued Expenses and Other Liabilities | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount Liability	0	4,207,000
Derivatives liability, fair values	$ 0	$ 18,000

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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