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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	$ 7,267,246	$ 7,138,498
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	6,215,716	6,181,911
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	113,574	126,180
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	81,959	110,080
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	836,666	700,664
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	19,331	19,663
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	3,212,312	3,285,297
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	3,164,722	3,201,822
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	40,441	55,696
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	7,149	27,779
Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Multi-family | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	1,455,592	1,373,800
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	1,395,034	1,306,466
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	30,575	30,551
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	29,983	36,783
Commercial and industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial and industrial | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	582,637	577,477
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	565,631	562,639
Commercial real estate owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	12,300	9,730
Commercial real estate owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	4,706	5,108
Commercial real estate owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	1,107,336	1,125,106
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	1,036,957	1,054,493
Commercial real estate non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	30,258	30,203
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	40,121	40,410
Commercial real estate non-owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate non-owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	53,372	56,491
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	53,372	56,491
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Construction | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	625,066	566,561
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	613,880	555,016
Residential real estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	11,186	11,545
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	77,778	79,731
Manufactured housing | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	70,232	71,924
Manufactured housing | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	7,546	7,807
Other
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	153,153	74,035
Other | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	0	0
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	152,554	73,724
Other | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable, gross	$ 599	$ 311

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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