Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Liabilities [Abstract]
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	$ 15,244	$ 15,822
Obligations of states and political subdivisions	82,464	78,300
Mortgage-backed securities [Abstract]
Agency	169,600	166,943
Non-agency	19,399	15,579
Other asset-backed securities	35,361	34,642
Corporate preferred stock	67	62
Corporate securities	9,515	8,109
Mortgage interest rate locks	69	35
Interest rate swaps	21	80
Liabilities [Abstract]
Interest rate swaps	423	541
Mortgage banking hedge instruments	81	39
Nonrecurring [Member]
Liabilities [Abstract]
Loans held-for-sale	0
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans held for sale	48,721	82,114
Impaired loans	10,994	12,343
Assets [Abstract]
Other real estate owned	7,904	9,929
Level I [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	0	0
Liabilities [Abstract]
Mortgage banking hedge instruments	0	0
Loans held-for-sale	0	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
Other asset-backed securities	0	0
Corporate preferred stock	0	0
Corporate securities	0	0
Mortgage interest rate locks	0	0
Interest rate swaps	0	0
Liabilities [Abstract]
Interest rate swaps	0	0
Mortgage banking hedge instruments	0	0
Level I [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans held for sale	0	0
Impaired loans	0	0
Assets [Abstract]
Other real estate owned	0	0
Level II [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	21	80
Liabilities [Abstract]
Mortgage banking hedge instruments	81	39
Loans held-for-sale	48,721	82,114
Level II [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	15,244	15,822
Obligations of states and political subdivisions	82,464	78,300
Mortgage-backed securities [Abstract]
Agency	169,600	166,943
Non-agency	19,399	15,579
Other asset-backed securities	35,361	34,642
Corporate preferred stock	67	62
Corporate securities	9,515	8,109
Mortgage interest rate locks	69	35
Interest rate swaps	21	80
Liabilities [Abstract]
Interest rate swaps	423	541
Mortgage banking hedge instruments	81	39
Level II [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans held for sale	48,721	82,114
Impaired loans	9,094	11,165
Assets [Abstract]
Other real estate owned	7,904	7,619
Level III [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	0	0
Liabilities [Abstract]
Mortgage banking hedge instruments	0	0
Loans held-for-sale	0	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
Other asset-backed securities	0	0
Corporate preferred stock	0	0
Corporate securities	0	0
Mortgage interest rate locks	0	0
Interest rate swaps	0	0
Liabilities [Abstract]
Interest rate swaps	0	0
Mortgage banking hedge instruments	0	0
Level III [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans held for sale	0	0
Impaired loans	1,900	1,178
Assets [Abstract]
Other real estate owned	$ 0	$ 2,310