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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,383,259		$ 7,700,873	$ 7,253,293
Allowance for loan and lease losses	(62,927)	$ (59,523)	(62,192)	(57,782)	$ (56,678)	$ (49,333)
Loans and leases receivable, net	6,320,332		7,638,681
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,383,259		7,700,873
Deferred loan costs/(fees) and premiums/(discounts), net	15,300		17,700
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,789,478		1,944,142	1,673,055
Allowance for loan and lease losses	(24,575)	(21,529)	(18,191)	(16,543)	(16,864)	(14,280)
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	891,029		867,013	823,193
Allowance for loan and lease losses	(6,579)	(6,877)	(6,674)	(6,012)	(5,732)	(4,971)
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,563,757		2,241,246	2,112,190
Allowance for loan and lease losses	(11,965)	(12,625)	(17,970)	(15,473)	(14,630)	(13,265)
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	75,359		68,741	71,494
Allowance for loan and lease losses	(4,118)	(3,120)	(1,827)	(1,870)	(1,840)	(1,701)
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	228,561		203,976	200,294
Allowance for loan and lease losses	(3,880)	$ (3,715)	(3,461)	$ (3,247)	$ (3,419)	$ (3,318)
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,775,953		2,305,490
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	59,122		70,265
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	653,475		826,731
Consumer | NTM Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	651,167		824,318
Consumer | NTM Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,308		$ 2,413

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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