Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 3,791	$ 3,711
Unpaid Principal Balance	4,120	4,464
Average Recorded Investment	3,417	3,235
Interest Income Recognized	104	30
Interest Recognized-Cash Method	76	22
Recorded Investment	3,129	4,093
Unpaid Principal Balance	3,466	4,396
Related Allowance	1,529	1,652
Average Recorded Investment	3,581	4,612
Interest Income Recognized	2	7
Interest Recognized-Cash Method	1	6
Recorded Investment	6,920	7,804
Unpaid Principal Balance	7,586	8,860
Related Allowance	1,529	1,652
Average Recorded Investment	6,998	7,847
Interest Income Recognized	106	37
Interest Recognized-Cash Method	77	28
Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,591	1,648
Unpaid Principal Balance	1,869	1,981
Average Recorded Investment	1,508	1,450
Interest Income Recognized	32	21
Interest Recognized-Cash Method	22	10
Recorded Investment	449	943
Unpaid Principal Balance	487	1,020
Related Allowance	112	213
Average Recorded Investment	624	1,110
Interest Income Recognized	2	7
Interest Recognized-Cash Method	1	6
Recorded Investment	2,040	2,591
Unpaid Principal Balance	2,356	3,001
Related Allowance	112	213
Average Recorded Investment	2,132	2,560
Interest Income Recognized	34	28
Interest Recognized-Cash Method	23	16
Land
Financing Receivable, Impaired [Line Items]
Recorded Investment	120	125
Unpaid Principal Balance	131	126
Average Recorded Investment	124	125
Interest Income Recognized	0	6
Interest Recognized-Cash Method	0	9
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	1	0
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	120	125
Unpaid Principal Balance	131	126
Related Allowance	0	0
Average Recorded Investment	125	125
Interest Income Recognized	0	6
Interest Recognized-Cash Method	0	9
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	403
Unpaid Principal Balance	0	413
Average Recorded Investment	173	315
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	0	403
Unpaid Principal Balance	0	413
Related Allowance	0	0
Average Recorded Investment	173	315
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,637	1,535
Unpaid Principal Balance	1,643	1,944
Average Recorded Investment	1,410	1,292
Interest Income Recognized	63	0
Interest Recognized-Cash Method	47	1
Recorded Investment	949	1,301
Unpaid Principal Balance	1,048	1,394
Related Allowance	145	275
Average Recorded Investment	1,108	1,542
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	2,586	2,836
Unpaid Principal Balance	2,691	3,338
Related Allowance	145	275
Average Recorded Investment	2,518	2,834
Interest Income Recognized	63	0
Interest Recognized-Cash Method	47	1
Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment	189	0
Unpaid Principal Balance	209	0
Average Recorded Investment	38	0
Interest Income Recognized	4	0
Interest Recognized-Cash Method	3	0
Recorded Investment	1,709	1,776
Unpaid Principal Balance	1,909	1,909
Related Allowance	1,259	1,098
Average Recorded Investment	1,801	1,857
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	1,898	1,776
Unpaid Principal Balance	2,118	1,909
Related Allowance	1,259	1,098
Average Recorded Investment	1,839	1,857
Interest Income Recognized	4	0
Interest Recognized-Cash Method	3	0
Home Equity and Second Mortgage
Financing Receivable, Impaired [Line Items]
Recorded Investment	254	0
Unpaid Principal Balance	268	0
Average Recorded Investment	164	53
Interest Income Recognized	5	2
Interest Recognized-Cash Method	4	2
Recorded Investment	22	73
Unpaid Principal Balance	22	73
Related Allowance	13	66
Average Recorded Investment	47	103
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	276	73
Unpaid Principal Balance	290	73
Related Allowance	13	66
Average Recorded Investment	211	156
Interest Income Recognized	5	2
Interest Recognized-Cash Method	4	2
Other Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	1
Interest Recognized-Cash Method	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Interest Recognized-Cash Method	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	1
Interest Recognized-Cash Method	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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