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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	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	$ 7,715,769	$ 7,138,498
Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	6,252,305	6,181,911
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	114,524	126,180
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	71,644	110,080
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	1,260,358	700,664
Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	16,938	19,663
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	3,017,531	3,285,297
Multi-family | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	2,969,263	3,201,822
Multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	43,147	55,696
Multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	5,121	27,779
Multi-family | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Multi-family | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	1,598,470	1,373,800
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	1,545,879	1,306,466
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	29,473	30,551
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	23,118	36,783
Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial and industrial | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	586,086	577,477
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	568,720	562,639
Commercial real estate owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	11,853	9,730
Commercial real estate owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	5,513	5,108
Commercial real estate owner occupied | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate owner occupied | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	1,176,575	1,125,106
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	1,108,632	1,054,493
Commercial real estate non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	30,051	30,203
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	37,892	40,410
Commercial real estate non-owner occupied | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Commercial real estate non-owner occupied | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	59,811	56,491
Construction | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	59,811	56,491
Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Construction | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	648,860	566,561
Residential real estate | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	641,166	555,016
Residential real estate | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	7,694	11,545
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	75,597	79,731
Manufactured housing | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Manufactured housing | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	68,192	71,924
Manufactured housing | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	7,405	7,807
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	552,839	74,035
Other consumer | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	0	0
Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	551,000	73,724
Other consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and lease receivable, gross	$ 1,839	$ 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=118952595&loc=d3e4428-111522

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