Loans Receivable and Allowance for Loan Losses - Schedule of Summarized Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 7,337,564	$ 7,253,902
Purchased credit-impaired ("PCI") loans	746	899
Premiums on purchased loans	2,474	3,243
Unearned discounts	(26)	(33)
Net deferred fees	(7,873)	(7,423)
Total loans	7,332,885	7,250,588
Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	5,311,445	5,127,453
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,634,759	1,695,021
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	391,360	431,428
Residential Real Estate \| Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,077,689	1,099,464
Commercial Real Estate \| Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,578,393	2,299,313
Multifamily \| Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,225,551	1,339,677
Construction Loans \| Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 429,812	$ 388,999

Purchased Credit-Impaired Loans

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- Definition

Unamortized Loan Commitment and Origination Fees

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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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No definition available.

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- Definition

Unearned discounts (other than cash or quantity discounts and the like), finance charges, and interest included in the face amount of receivables, that are shown as a deduction from the related receivables. For example, 1) finance charges booked as a receivable when a loan is made and recognized as income at a later date; and 2) interest charges deducted from the face loan amount, resulting in a discounted amount actually advanced to the borrower (wherein the receivable includes the amount actually advanced to the borrower and the as yet unearned interest income).

+ References

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 2
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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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