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Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Contract	Sep. 30, 2018 USD ($) Contract	Sep. 30, 2019 USD ($) Contract	Sep. 30, 2018 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	1	1	9	11
Pre-Modification Outstanding Recorded Investment	$ 605	$ 19	$ 1,050	$ 298
Post-Modification Outstanding Recorded Investment	$ 604	$ 18	$ 1,020	$ 255
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	1		1
Pre-Modification Outstanding Recorded Investment	$ 605		$ 610
Post-Modification Outstanding Recorded Investment	$ 604		$ 604
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract			1	1
Pre-Modification Outstanding Recorded Investment			$ 44	$ 10
Post-Modification Outstanding Recorded Investment			$ 37	$ 8
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	1		1
Pre-Modification Outstanding Recorded Investment	$ 605		$ 610
Post-Modification Outstanding Recorded Investment	$ 604		$ 604
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract			4	5
Pre-Modification Outstanding Recorded Investment			$ 194	$ 203
Post-Modification Outstanding Recorded Investment			$ 183	$ 176
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract		1	1	4
Pre-Modification Outstanding Recorded Investment		$ 19	$ 15	$ 65
Post-Modification Outstanding Recorded Investment		$ 18	$ 12	$ 52
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract			2	1
Pre-Modification Outstanding Recorded Investment			$ 187	$ 20
Post-Modification Outstanding Recorded Investment			$ 184	$ 19

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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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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, before troubled debt restructuring, of financing receivable to be modified.

+ References

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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=118936363&loc=SL6953676-111524

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