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INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security	Mar. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
OTTI on investment securities	$ 0	$ 3,300,000	$ 0
Gross realized gains on sales and calls of securities available-for-sale	$ 208,000		5,241,000
Securities available for sale portfolio | security	99	145
Available for sale securities in unrealized loss position | security	88	118
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Securities pledged	$ 107,300,000	$ 163,000,000
Non-agency commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities sold	132,200,000
Gross realized gains on sales and calls of securities available-for-sale	9,000
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Securities sold	365,300,000
Gross realized gains on sales and calls of securities available-for-sale	$ 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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- Definition

Number of available for sale securities in portfolio.

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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=82897076&loc=d3e27357-111563

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- Definition

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
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 8A
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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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