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Troubled Debt Restructurings, by Type of Loan Modification (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	$ 199	$ 5,406	$ 8,467
Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	20	284	1,714
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	50	1,507	1,285
Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	0	0	675
Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	129	3,615	4,793
Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	129	3,368	1,351
Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			29
Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	0	0	2,190
Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	0	0	390
Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment	0	247	833
Rate Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Rate Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		5,376	4,289
Term Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		284	1,328
Term Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		1,507	625
Term Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	200
Term Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		3,585	2,136
Term Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		3,338	313
Term Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			29
Term Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	1,006
Term Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	330
Term Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		247	458
Interest-Only Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	2
Interest-Only Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	2
Interest-Only Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Interest-Only Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Term Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		30	3,221
Rate & Term Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	269
Rate & Term Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	658
Rate & Term Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	475
Rate & Term Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		30	1,819
Rate & Term Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		30	200
Rate & Term Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Rate & Term Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	1,184
Rate & Term Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	60
Rate & Term Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	375
Rate & Interest-Only Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Rate & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate & Interest-Only Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	222
Term & Interest-Only Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	222
Term & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	222
Term & Interest-Only Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Term & Interest-Only Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate, Term & Interest-Only Modification
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	733
Rate, Term & Interest-Only Modification | Consumer Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	117
Rate, Term & Interest-Only Modification | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate, Term & Interest-Only Modification | Small Business Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate, Term & Interest-Only Modification | Real Estate Loans
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	616
Rate, Term & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	616
Rate, Term & Interest-Only Modification | Real Estate Loans | Equity Lines
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment			0
Rate, Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate, Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		0	0
Rate, Term & Interest-Only Modification | Real Estate Loans | Other construction/Land
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding, Recorded Investment		$ 0	$ 0

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