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INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended					6 Months Ended
	Jun. 30, 2019 USD ($) security	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) security	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) security	Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
OTTI on investment securities	$ 0		$ 3,300,000	$ 0		$ 0	$ 0
Gross realized gains on sales and calls of securities available-for-sale	$ 0			$ 278,000		$ 208,000	$ 5,519,000
Securities available for sale portfolio | security	82		145			82
Available for sale securities in unrealized loss position | security	64		118			64
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Securities pledged	$ 106,300,000		$ 163,000,000.0			$ 106,300,000
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Securities sold	279,200,000	$ 132,200,000				644,500,000
Gross realized gains on sales and calls of securities available-for-sale	$ 0	$ 9,000				$ 143,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Securities sold					$ 76,800,000
Gross realized gains on sales and calls of securities available-for-sale					$ 4,900,000

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 1A
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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563

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-Section 50
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