Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Liabilities:
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	$ 13,948	$ 15,822
Obligations of states and political subdivisions	79,147	78,300
Mortgage-backed securities:
Agency	166,563	166,943
Non-agency	17,491	15,579
Other asset-backed securities	33,033	34,642
Corporate preferred stock	70	62
Corporate securities	9,880	8,109
Loans held for sale	65,322	82,114
Interest rate swaps	159	80
Mortgage interest rate locks		35
Mortgage banking hedge instruments	251
Liabilities:
Mortgage interest rate locks	73
Interest rate swaps	312	541
Mortgage banking hedge instruments		39
Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	9,294	12,343
Assets [Abstract]
Other real estate owned	7,570	9,929
Level I [Member]
Mortgage-backed securities:
Loans held for sale	0	0
Mortgage interest rate locks	0	0
Mortgage banking hedge instruments	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:
Agency	0	0
Non-agency	0	0
Other asset-backed securities	0	0
Corporate preferred stock	0	0
Corporate securities	0	0
Loans held for sale	0	0
Interest rate swaps	0	0
Mortgage interest rate locks		0
Mortgage banking hedge instruments	0
Liabilities:
Mortgage interest rate locks	0
Interest rate swaps	0	0
Mortgage banking hedge instruments		0
Level I [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	0	0
Assets [Abstract]
Other real estate owned	0	0
Level II [Member]
Mortgage-backed securities:
Loans held for sale	65,322	82,114
Mortgage interest rate locks	159	80
Mortgage banking hedge instruments	251
Level II [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	13,948	15,822
Obligations of states and political subdivisions	79,147	78,300
Mortgage-backed securities:
Agency	166,563	166,943
Non-agency	17,491	15,579
Other asset-backed securities	33,033	34,642
Corporate preferred stock	70	62
Corporate securities	9,880	8,109
Loans held for sale	65,322	82,114
Interest rate swaps	159	80
Mortgage interest rate locks		35
Mortgage banking hedge instruments	251
Liabilities:
Mortgage interest rate locks	73
Interest rate swaps	312	541
Mortgage banking hedge instruments		39
Level II [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	7,494	11,165
Assets [Abstract]
Other real estate owned	7,570	7,619
Level III [Member]
Mortgage-backed securities:
Loans held for sale	0	0
Mortgage interest rate locks	0	0
Mortgage banking hedge instruments	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:
Agency	0	0
Non-agency	0	0
Other asset-backed securities	0	0
Corporate preferred stock	0	0
Corporate securities	0	0
Loans held for sale	0	0
Interest rate swaps	0	0
Mortgage interest rate locks		0
Mortgage banking hedge instruments	0
Liabilities:
Mortgage interest rate locks	0
Interest rate swaps	0	0
Mortgage banking hedge instruments		0
Level III [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	1,800	1,178
Assets [Abstract]
Other real estate owned	$ 0	$ 2,310