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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 34,801	$ 30,700
TDRs	7,185	8,599
Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	5,840	5,744
Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,345	2,855
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	554
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	12,036	8,413
TDRs	1,531	2,409
Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,334	880
Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	197	1,529
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	2,374	3,260
TDRs	185	337
Commercial and Industrial [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	185	168
Commercial and Industrial [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs		169
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	5,299	4,610
TDRs	746	624
Home Equity [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	477	426
Home Equity [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	269	198
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	12,590	8,413
TDRs	1,531	2,409
Commercial Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,334	880
Commercial Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	197	1,529
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	14,171	13,831
TDRs	4,662	5,106
Residential Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	3,794	4,185
Residential Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	868	921
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	367	586
TDRs	61	123
Consumer [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	50	85
Consumer [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	$ 11	$ 38

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Amount of financing receivable modified as troubled debt restructuring.

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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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-Topic 310
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
-Paragraph 16
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-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

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