Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Number Of Impaired Loans With Unobservable Inputs	17
Assets [Abstract]
Other real estate owned	$ 0	$ 0
Percentage at which new appraisals discounted (in hundredths)	10.00%
Number of consecutive monthly payments for come out from non accrual status	6
Recurring [Member]
Assets [Abstract]
U.S. government agencies	13,654	9,343
Obligations of states and political subdivisions	74,304	67,542
Mortgage-backed securities [Abstract]
Agency	165,512	187,070
Non-agency	15,305	18,206
Other-asset backed securities	32,192	15,796
Corporate preferred securities	61	40
Corporate securities	7,346	9,976
Trust preferred securities		269
Mortgage interest rate locks	91
Liabilities [Abstract]
Interest rate swap	563	314
Mortgage banking hedge instruments	63
Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	92,501	92,514
Impaired loans	11,895	10,648
Assets [Abstract]
Other real estate owned	11,933	8,535
Level 1 [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	0
Liabilities [Abstract]
Interest rate swap	0
Mortgage banking hedge instruments	0
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	0
Level 1 [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 securities	0	0
Corporate securities	0	0
Trust preferred securities		0
Mortgage interest rate locks	0
Liabilities [Abstract]
Interest rate swap	0	0
Mortgage banking hedge instruments	0
Level 1 [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 2 [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	91
Liabilities [Abstract]
Interest rate swap	563
Mortgage banking hedge instruments	63
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	92,501
Level 2 [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	13,654	9,343
Obligations of states and political subdivisions	74,304	67,542
Mortgage-backed securities [Abstract]
Agency	165,512	187,070
Non-agency	15,305	18,206
Other-asset backed securities	32,192	15,796
Corporate preferred securities	61	40
Corporate securities	7,346	9,976
Trust preferred securities		269
Mortgage interest rate locks	91
Liabilities [Abstract]
Interest rate swap	563	314
Mortgage banking hedge instruments	63
Level 2 [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	92,501	92,514
Impaired loans	9,823	6,767
Assets [Abstract]
Other real estate owned	11,933	8,535
Level 3 [Member]
Mortgage-backed securities [Abstract]
Mortgage interest rate locks	0
Liabilities [Abstract]
Interest rate swap	0
Mortgage banking hedge instruments	0
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	0
Level 3 [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 securities	0	0
Corporate securities	0	0
Trust preferred securities		0
Mortgage interest rate locks	0
Liabilities [Abstract]
Interest rate swap	0	0
Mortgage banking hedge instruments	0
Level 3 [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Loans Held-for-sale	0	0
Impaired loans	$ 2,072	$ 3,881