Allowance for Loan Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2016 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan	4	3	9	8
Pre-mod outstanding principal balance	$ 495	$ 251	$ 823	$ 858
Post-mod outstanding principal balance	496	255	862	867
Financial impact due to TDR taken as additional provision	$ 98	$ 86	$ 125	$ 257
Number that defaulted during the period \| SecurityLoan	1	2	1	3
Recorded investment of TDRs that defaulted during the period	$ 86	$ 135	$ 86	$ 181
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	0	$ 0	$ 0
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan	3		4
Pre-mod outstanding principal balance	$ 163		$ 295
Post-mod outstanding principal balance	164		297
Financial impact due to TDR taken as additional provision	54		73
Number that defaulted during the period \| SecurityLoan				1
Recorded investment of TDRs that defaulted during the period				$ 46
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	$ 0	$ 0	$ 0
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan		2	1	3
Pre-mod outstanding principal balance		$ 182	$ 12	$ 468
Post-mod outstanding principal balance		182	12	470
Financial impact due to TDR taken as additional provision		86	8	249
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	$ 0	$ 0	$ 0
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan		1	1	1
Pre-mod outstanding principal balance		$ 69	$ 105	$ 69
Post-mod outstanding principal balance		73	105	74
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	0	0	0
Auto Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	0	0	0
Construction [Member] \| Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	0	0	0
Construction [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
RE Mortgage [Member] \| Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan	1		1	1
Pre-mod outstanding principal balance	$ 332		$ 332	$ 108
Post-mod outstanding principal balance	332		332	110
Financial impact due to TDR taken as additional provision	$ 44		$ 44	$ 8
Number that defaulted during the period \| SecurityLoan	1	1	1	1
Recorded investment of TDRs that defaulted during the period	$ 86	$ 98	$ 86	$ 98
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	$ 0	$ 0	$ 0
RE Mortgage [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan			2	1
Pre-mod outstanding principal balance			$ 79	$ 124
Post-mod outstanding principal balance			116	124
Financial impact due to TDR taken as additional provision				$ (5)
Number that defaulted during the period \| SecurityLoan		1		1
Recorded investment of TDRs that defaulted during the period		$ 37		$ 37
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	0	0	$ 0
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number \| SecurityLoan				2
Pre-mod outstanding principal balance				$ 89
Post-mod outstanding principal balance				89
Financial impact due to TDR taken as additional provision				5
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0

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Financing receivable modification post modification recorded investment.

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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=49124121&loc=SL6953676-111524

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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