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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Loan	Sep. 30, 2018 USD ($) Loan	Sep. 30, 2019 USD ($) Loan	Sep. 30, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	7	8	21	33
Recorded investment | $	$ 196	$ 473	$ 1,142	$ 1,458
Number of loans | Loan			4	0
Recorded Investment | $			$ 158	$ 0
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	0	1	0
Recorded investment | $	$ 0	$ 0	$ 431	$ 0
Manufactured housing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	7	7	19	30
Recorded investment | $	$ 196	$ 321	$ 628	$ 1,093
Number of loans | Loan			3	0
Recorded Investment | $			$ 76	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	1	1	2
Recorded investment | $	$ 0	$ 152	$ 83	$ 352
Number of loans | Loan			1	0
Recorded Investment | $			$ 82	$ 0
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	0	0	1
Recorded investment | $	$ 0	$ 0	$ 0	$ 13

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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