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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Composition of Nonaccrual Loans and Leases (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	$ 25,523	$ 19,382
Loans past due 90 days or more and still accruing	0	0
Specific allowance on non accrual loans	600	1,100
NTM Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	1,520	1,171
Loans past due 90 days or more and still accruing	0	0
Traditional Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	24,003	18,211
Loans past due 90 days or more and still accruing	0	0
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	5,751	3,723
Commercial | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	2,249	1,781
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	5,751	3,723
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	2,249	1,781
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	17,078	9,347
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	445	4,531
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	1,520	1,171
Consumer | NTM Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	0	0
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	15,558	8,176
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-accrual loans and leases	$ 445	$ 4,531

X

- Definition

Financing Receivable, Recorded Investment, Nonaccrual Status, Allowance

+ References

No definition available.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
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