Allowance for Loan Losses and Impaired Loans (Schedule of Purchased Credit Impaired Loans) (Detail) - Purchased Credit Impaired loans $ in Thousands	Dec. 31, 2018 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Contractually required payments receivable of loans	$ 2,178
Cash flows expected to be collected at acquisition	1,781
Fair value of acquired loans at acquisition	1,781
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Contractually required payments receivable of loans	233
Commercial Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Contractually required payments receivable of loans	1,724
Commercial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Contractually required payments receivable of loans	$ 221

Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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- Definition

Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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