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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, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	40	64	162
Recorded Investment | $	$ 8,071	$ 6,616	$ 7,457
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	1	3
Recorded Investment | $	$ 6,437	$ 76	$ 791
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	1
Recorded Investment | $	$ 0	$ 1,844	$ 211
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	36	58	156
Recorded Investment | $	$ 1,634	$ 2,286	$ 6,251
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	4	2
Recorded Investment | $	$ 0	$ 2,410	$ 204

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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