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Loans Receivable and Allowance for Loan Losses - Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	41	40	64
Recorded Investment | $	$ 1,675	$ 8,071	$ 6,616
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	4	1
Recorded Investment | $	$ 0	$ 6,437	$ 76
Commercial real estate non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 1,844
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	0	4
Recorded Investment | $	$ 352	$ 0	$ 2,410
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	38	36	58
Recorded Investment | $	$ 1,310	$ 1,634	$ 2,286
Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	0	0
Recorded Investment | $	$ 13	$ 0	$ 0

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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