Fair Value Measurements (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Mortgage-backed securities [Abstract]
Interest rate swaps	$ 80,000
Liabilities [Abstract]
Interest rate swaps	541,000
Loans held-for-sale		92,514,000
Percentage at which new appraisals are discounted (in hundredths)	10.00%
Number of consecutive monthly payments on timely basis	6
Recurring [Member]
Assets [Abstract]
U.S. government agencies	15,822,000	9,343,000
Obligations of states and political subdivisions	78,300,000	67,542,000
Mortgage-backed securities [Abstract]
Agency	166,943,000	187,070,000
Non-agency	15,579,000	18,206,000
Other asset-backed securities	34,642,000	15,796,000
Corporate preferred securities	62,000	40,000
Corporate securities	8,109,000	9,976,000
Mortgage interest rate locks	35,000
Trust preferred securities		269,000
Liabilities [Abstract]
Derivative financial instruments	39,000	314,000
Nonrecurring [Member]
Liabilities [Abstract]
Loans held-for-sale	0	0
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	12,343,000	10,648,000
Mortgages held for sale	82,114,000	92,514,000
Assets [Abstract]
Other real estate owned	9,929,000	8,535,000
Level I [Member]
Mortgage-backed securities [Abstract]
Interest rate swaps	0
Liabilities [Abstract]
Interest rate swaps	0
Derivative financial instruments	0
Loans held-for-sale	0
Level I [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	0	0
Obligations of states and political subdivisions	0	0
Mortgage-backed securities [Abstract]
Agency	0	0
Non-agency	0	0
Corporate preferred securities	0	0
Corporate securities	0	0
Trust preferred securities		0
Liabilities [Abstract]
Derivative financial instruments	0	0
Level I [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	0	0
Mortgages held for sale	0	0
Assets [Abstract]
Other real estate owned	0	0
Level II [Member]
Mortgage-backed securities [Abstract]
Interest rate swaps	80,000
Liabilities [Abstract]
Interest rate swaps	541,000
Derivative financial instruments	39,000
Loans held-for-sale	82,114,000
Level II [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	15,822,000	9,343,000
Obligations of states and political subdivisions	78,300,000	67,542,000
Mortgage-backed securities [Abstract]
Agency	166,943,000	187,070,000
Non-agency	15,579,000	18,206,000
Other asset-backed securities	34,642,000	15,796,000
Corporate preferred securities	62,000	40,000
Corporate securities	8,109,000	9,976,000
Mortgage interest rate locks	35,000
Trust preferred securities		269,000
Liabilities [Abstract]
Derivative financial instruments	39,000	314,000
Level II [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	11,165,000	6,767,000
Mortgages held for sale	82,114,000	92,514,000
Assets [Abstract]
Other real estate owned	7,619,000	8,535,000
Level III [Member]
Mortgage-backed securities [Abstract]
Interest rate swaps	0
Liabilities [Abstract]
Interest rate swaps	0
Derivative financial instruments	0
Loans held-for-sale	0
Level III [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	0	0
Obligations of states and political subdivisions	0	0
Mortgage-backed securities [Abstract]
Agency	0	0
Non-agency	0	0
Corporate preferred securities	0	0
Corporate securities	0	0
Trust preferred securities		0
Liabilities [Abstract]
Derivative financial instruments	0	0
Level III [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	1,178,000	3,881,000
Mortgages held for sale	0	0
Assets [Abstract]
Other real estate owned	$ 2,310,000	$ 0