3. Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Entity's loan portfolio [Abstract]
Total loans	$ 2,080,068	$ 2,031,131
Deferred loan costs	(475)	299
Allowance for loan losses	(29,824)	(32,588)
Net loans	2,049,769	1,998,842
ConstructionAndLandDevelopmentMember
Entity's loan portfolio [Abstract]
Total loans	194,380	214,667
Allowance for loan losses	(8,230)	(9,856)
ResidentialConstructionAndLandDevelopmentMember
Entity's loan portfolio [Abstract]
Total loans	45,308	49,995
CommercialConstructionAndLandDevelopmentMember
Entity's loan portfolio [Abstract]
Total loans	149,072	164,672
CommercialRealEstateMember
Entity's loan portfolio [Abstract]
Total loans	921,023	844,860
Allowance for loan losses	(9,045)	(8,565)
CommercialRealEstateOwnerOccupiedMember
Entity's loan portfolio [Abstract]
Total loans	343,944	317,976
CommercialRealEstateNonOwnerOccupiedMember
Entity's loan portfolio [Abstract]
Total loans	458,646	417,658
FarmlandMember
Entity's loan portfolio [Abstract]
Total loans	12,099	15,756
MultifamilyNonresidentialAndJuniorLiensMember
Entity's loan portfolio [Abstract]
Total loans	106,334	93,470
ConsumerRealEstateMember
Entity's loan portfolio [Abstract]
Total loans	728,896	756,236
Allowance for loan losses	(10,811)	(10,019)
ConsumerRealEstateHomeEquityMember
Entity's loan portfolio [Abstract]
Total loans	246,806	263,035
ConsumerRealEstateOneToFourFamilyResidentialSecuredByFirstDeedsOfTrusttMember
Entity's loan portfolio [Abstract]
Total loans	447,400	450,667
ConsumerRealEstateSecuredBy1To4FamilyResidentialSecuredBySecondDeedsOfTrustMember
Entity's loan portfolio [Abstract]
Total loans	34,690	42,534
Commercial And Industrial Loans [Member]
Entity's loan portfolio [Abstract]
Total loans	203,840	189,887
Allowance for loan losses	(1,642)	(4,059)
Consumer And Other Loan [Member]
Entity's loan portfolio [Abstract]
Total loans	31,929	25,481
Allowance for loan losses	(96)	(89)
DepositOverdraftsMember
Entity's loan portfolio [Abstract]
Total loans	3,677	3,526
All other Loans
Entity's loan portfolio [Abstract]
Total loans	1,555	1,739
Consumer installment loans
Entity's loan portfolio [Abstract]
Total loans	$ 26,697	$ 20,216