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SEGMENT REPORTING - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			4
Segment Reporting Information [Line Items]
Noninterest expense	$ 100,075	$ 87,920	$ 189,175	$ 163,799
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Noninterest expense	54,055	46,235	104,322	87,142
Operating Segments | Mortgage Banking
Segment Reporting Information [Line Items]
Noninterest expense	42,772	38,616	80,045	72,761
Adjustment | Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Noninterest expense	(3,500)	(1,000)	(7,400)	(3,600)
Adjustment | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Noninterest expense	(3,700)	(4,200)	(7,200)	(6,200)
Adjustment | Operating Segments | Mortgage Banking
Segment Reporting Information [Line Items]
Noninterest expense	7,100	4,700	13,800	9,100
Adjustment | Operating Segments | Financial Advisory
Segment Reporting Information [Line Items]
Noninterest expense	$ 158	$ 419	$ 760	$ 691

X

- Definition

Total aggregate amount of all noninterest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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