Loans - Age Analysis of Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 3,484	$ 4,649
60-89 Days Past Due	1,060	1,717
Greater Than 90 Days	3,295	2,737
Total Past Due	7,839	9,103
Current	634,514	614,427
Loans, net of unearned income	642,353	623,530
Recorded Investment > 90 Days and Accruing	702	457
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	166	23
60-89 Days Past Due	5	49
Greater Than 90 Days	325	304
Total Past Due	496	376
Current	96,822	91,348
Loans, net of unearned income	97,318	91,724
Recorded Investment > 90 Days and Accruing
Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater Than 90 Days
Total Past Due
Current	17,036	17,617
Loans, net of unearned income	17,036	17,617
Recorded Investment > 90 Days and Accruing
Commercial Real Estate -Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	211	1,448
60-89 Days Past Due	353	200
Greater Than 90 Days	323	145
Total Past Due	887	1,793
Current	208,109	198,086
Loans, net of unearned income	208,996	199,879
Recorded Investment > 90 Days and Accruing	9
Consumer - Credit Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	13	16
60-89 Days Past Due	3	1
Greater Than 90 Days	16	25
Total Past Due	32	42
Current	2,999	3,157
Loans, net of unearned income	3,031	3,199
Recorded Investment > 90 Days and Accruing	16	25
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	4	74
60-89 Days Past Due		86
Greater Than 90 Days	4	10
Total Past Due	8	170
Current	5,315	5,694
Loans, net of unearned income	5,323	5,864
Recorded Investment > 90 Days and Accruing		1
Consumer - Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	112	212
60-89 Days Past Due	38	17
Greater Than 90 Days	10	11
Total Past Due	160	240
Current	33,697	31,944
Loans, net of unearned income	33,857	32,184
Recorded Investment > 90 Days and Accruing		8
Student Loans - TERI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	33	77
60-89 Days Past Due	13	43
Greater Than 90 Days	38	19
Total Past Due	84	139
Current	5,680	5,749
Loans, net of unearned income	5,764	5,888
Recorded Investment > 90 Days and Accruing
Student Loans - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	58	119
60-89 Days Past Due	3	123
Greater Than 90 Days	74	180
Total Past Due	135	422
Current	4,653	4,841
Loans, net of unearned income	4,788	5,263
Recorded Investment > 90 Days and Accruing	74	180
Residential - Prime [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,887	2,680
60-89 Days Past Due	645	1,198
Greater Than 90 Days	2,505	2,043
Total Past Due	6,037	5,921
Current	260,203	255,991
Loans, net of unearned income	266,240	261,912
Recorded Investment > 90 Days and Accruing	$ 603	$ 243