Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Loans	Dec. 31, 2012 Loans
Financing Receivable, Modifications [Line Items]
Number of Loans	71	260
Pre-Modification Outstanding Recorded Investment	$ 11,779	$ 15,654
Post-Modification Outstanding Recorded Investment	11,018	14,346
Total Difference in Recorded Investment	(761)	(1,308)
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	9
Pre-Modification Outstanding Recorded Investment	3,769
Post-Modification Outstanding Recorded Investment	3,298
Total Difference in Recorded Investment	(471)
Interest Rate Reduction and Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2
Pre-Modification Outstanding Recorded Investment	664
Post-Modification Outstanding Recorded Investment	636
Total Difference in Recorded Investment	(28)
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Investment	4,339
Post-Modification Outstanding Recorded Investment	4,216
Total Difference in Recorded Investment	(123)
Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	56	242
Pre-Modification Outstanding Recorded Investment	1,983	6,904
Post-Modification Outstanding Recorded Investment	1,856	6,904
Total Difference in Recorded Investment	(127)
Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	14
Pre-Modification Outstanding Recorded Investment	970	6,898
Post-Modification Outstanding Recorded Investment	958	5,607
Total Difference in Recorded Investment	(12)	(1,291)
Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	4
Pre-Modification Outstanding Recorded Investment	54	1,852
Post-Modification Outstanding Recorded Investment	54	1,835
Total Difference in Recorded Investment		(17)
Commercial Real Estate [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	4
Pre-Modification Outstanding Recorded Investment	2,772
Post-Modification Outstanding Recorded Investment	2,494
Total Difference in Recorded Investment	(278)
Commercial Real Estate [Member] | Interest Rate Reduction and Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2
Pre-Modification Outstanding Recorded Investment	664
Post-Modification Outstanding Recorded Investment	636
Total Difference in Recorded Investment	(28)
Commercial Real Estate [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Investment	4,339
Post-Modification Outstanding Recorded Investment	4,216
Total Difference in Recorded Investment	(123)
Commercial Real Estate [Member] | Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	6
Pre-Modification Outstanding Recorded Investment	227
Post-Modification Outstanding Recorded Investment	190
Total Difference in Recorded Investment	(37)
Commercial Real Estate [Member] | Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	3
Pre-Modification Outstanding Recorded Investment	219	704
Post-Modification Outstanding Recorded Investment	219	693
Total Difference in Recorded Investment		(11)
Commercial Real Estate [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		2
Pre-Modification Outstanding Recorded Investment		1,785
Post-Modification Outstanding Recorded Investment		1,768
Total Difference in Recorded Investment		(17)
Commercial and Industrial [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2
Pre-Modification Outstanding Recorded Investment	670
Post-Modification Outstanding Recorded Investment	638
Total Difference in Recorded Investment	(32)
Commercial and Industrial [Member] | Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Investment	3
Post-Modification Outstanding Recorded Investment	1
Total Difference in Recorded Investment	(2)
Commercial and Industrial [Member] | Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	4
Pre-Modification Outstanding Recorded Investment	751	2,825
Post-Modification Outstanding Recorded Investment	739	2,601
Total Difference in Recorded Investment	(12)	(224)
Commercial Construction [Member] | Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		6
Pre-Modification Outstanding Recorded Investment		2,894
Post-Modification Outstanding Recorded Investment		1,874
Total Difference in Recorded Investment		(1,020)
Residential Mortgage [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2
Pre-Modification Outstanding Recorded Investment	153
Post-Modification Outstanding Recorded Investment	149
Total Difference in Recorded Investment	(4)
Residential Mortgage [Member] | Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	8	76
Pre-Modification Outstanding Recorded Investment	617	2,349
Post-Modification Outstanding Recorded Investment	592	2,349
Total Difference in Recorded Investment	(25)
Residential Mortgage [Member] | Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		475
Post-Modification Outstanding Recorded Investment		439
Total Difference in Recorded Investment		(36)
Residential Mortgage [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	2
Pre-Modification Outstanding Recorded Investment	54	67
Post-Modification Outstanding Recorded Investment	54	67
Home Equity [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Investment	174
Post-Modification Outstanding Recorded Investment	17
Total Difference in Recorded Investment	(157)
Home Equity [Member] | Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	30
Pre-Modification Outstanding Recorded Investment	1,032
Post-Modification Outstanding Recorded Investment	982
Total Difference in Recorded Investment	(50)
Home Equity [Member] | Discharge of Debt [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		161
Pre-Modification Outstanding Recorded Investment		4,530
Post-Modification Outstanding Recorded Investment		4,530
Installment and Other Consumer [Member] | Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	11	5
Pre-Modification Outstanding Recorded Investment	104	25
Post-Modification Outstanding Recorded Investment	91	25
Total Difference in Recorded Investment	$ (13)