LOANS - Average recorded investment and interest income for impaired loans (Details 2) (Total Loans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	$ 15,605		$ 21,555
With no related allowance recorded, Interest Income Recognized	588		1,287
With an allowance recorded
With an allowance recorded, Average Recorded Investment	3,398		1,309
With an allowance recorded, Interest IncomeRecognized	213		70
Average Recorded Investment, Grand total	19,003		22,864		11,025
Interest Income Recognized, Grand total	801		1,357		325
Commercial real estate - owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	858		2,895
With no related allowance recorded, Interest Income Recognized	58		211
With an allowance recorded
With an allowance recorded, Average Recorded Investment	270
With an allowance recorded, Interest IncomeRecognized	21
Commercial real estate - non-owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	4,043	[1]	5,082	[1]
With no related allowance recorded, Interest Income Recognized	101	[1]	264	[1]
With an allowance recorded
With an allowance recorded, Average Recorded Investment	1,345	[1]		[1]
With an allowance recorded, Interest IncomeRecognized	102	[1]		[1]
Construction and land development
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	4,245		5,441
With no related allowance recorded, Interest Income Recognized	196		344
With an allowance recorded
With an allowance recorded, Average Recorded Investment			965
With an allowance recorded, Interest IncomeRecognized			30
Commercial loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	4,046		7,196
With no related allowance recorded, Interest Income Recognized	155		444
With an allowance recorded
With an allowance recorded, Average Recorded Investment			344
With an allowance recorded, Interest IncomeRecognized			40
Residential 1-4 family
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	2,413		941
With no related allowance recorded, Interest Income Recognized	78		24
With an allowance recorded
With an allowance recorded, Average Recorded Investment	1,783
With an allowance recorded, Interest IncomeRecognized	90
Other consumer loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Covered loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	4,715		3,925
With no related allowance recorded, Interest Income Recognized	234		245
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Average Recorded Investment, Grand total	4,715		3,925		4,943
Interest Income Recognized, Grand total	234		245		160
Covered loans | Commercial real estate - owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	134		187
With no related allowance recorded, Interest Income Recognized	19		19
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Covered loans | Commercial real estate - non-owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	2,101	[1]	1,788	[1]
With no related allowance recorded, Interest Income Recognized	62	[1]	84	[1]
With an allowance recorded
With an allowance recorded, Average Recorded Investment		[1]		[1]
With an allowance recorded, Interest IncomeRecognized		[1]		[1]
Covered loans | Construction and land development
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	1,087		1,080
With no related allowance recorded, Interest Income Recognized	101		103
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Covered loans | Commercial loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	210		216
With no related allowance recorded, Interest Income Recognized	23		23
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Covered loans | Residential 1-4 family
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	1,183		654
With no related allowance recorded, Interest Income Recognized	29		16
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Covered loans | Other consumer loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized
Non-covered Loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	10,890		17,630
With no related allowance recorded, Interest Income Recognized	354		1,042
With an allowance recorded
With an allowance recorded, Average Recorded Investment	3,398		1,309
With an allowance recorded, Interest IncomeRecognized	213		70
Average Recorded Investment, Grand total	14,288		18,939		6,082
Interest Income Recognized, Grand total	567		1,112		165
Non-covered Loans | Commercial real estate - owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	724		2,708
With no related allowance recorded, Interest Income Recognized	39		192
With an allowance recorded
With an allowance recorded, Average Recorded Investment	270
With an allowance recorded, Interest IncomeRecognized	21
Non-covered Loans | Commercial real estate - non-owner occupied
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	1,942	[1]	3,294	[1]
With no related allowance recorded, Interest Income Recognized	39	[1]	180	[1]
With an allowance recorded
With an allowance recorded, Average Recorded Investment	1,345	[1]		[1]
With an allowance recorded, Interest IncomeRecognized	102	[1]		[1]
Non-covered Loans | Construction and land development
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	3,158		4,361
With no related allowance recorded, Interest Income Recognized	95		241
With an allowance recorded
With an allowance recorded, Average Recorded Investment			965
With an allowance recorded, Interest IncomeRecognized			30
Non-covered Loans | Commercial loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	3,836		6,980
With no related allowance recorded, Interest Income Recognized	132		421
With an allowance recorded
With an allowance recorded, Average Recorded Investment			344
With an allowance recorded, Interest IncomeRecognized			40
Non-covered Loans | Residential 1-4 family
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment	1,230		287
With no related allowance recorded, Interest Income Recognized	49		8
With an allowance recorded
With an allowance recorded, Average Recorded Investment	1,783
With an allowance recorded, Interest IncomeRecognized	90
Non-covered Loans | Other consumer loans
With no related allowance recorded
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With an allowance recorded
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest IncomeRecognized

[1] Includes loans secured by farmland and multi-family residential loans.