Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 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	$ 21,465	$ 15,822
Obligations of states and political subdivisions	76,104	78,300
Mortgage-backed securities:
Agency	161,055	166,943
Non-agency	18,123	15,579
Other asset-backed securities	36,237	34,642
Corporate preferred stock	73	62
Corporate securities	15,321	8,109
Mortgage interest rate locks	651	35
Loans held for sale	41,855	82,114
Interest rate swaps	167	80
Mortgage servicing rights	155
Liabilities:
Interest rate swaps	326	541
Mortgage banking hedge instruments	613	39
Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	8,305	12,343
Assets [Abstract]
Other real estate owned	4,530	9,929
Level I [Member]
Mortgage-backed securities:
Mortgage interest rate locks	0	0
Loans held for sale	0	0
Mortgage servicing rights	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
Mortgage interest rate locks	0	0
Loans held for sale	0	0
Interest rate swaps	0	0
Mortgage servicing rights	0
Liabilities:
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]
Impaired loans	0	0
Assets [Abstract]
Other real estate owned	0	0
Level II [Member]
Mortgage-backed securities:
Mortgage interest rate locks	167	80
Loans held for sale	41,855	82,114
Mortgage servicing rights	155
Level II [Member] | Recurring [Member]
Assets [Abstract]
U.S. government agencies	21,465	15,822
Obligations of states and political subdivisions	76,104	78,300
Mortgage-backed securities:
Agency	161,055	166,943
Non-agency	18,123	15,579
Other asset-backed securities	36,237	34,642
Corporate preferred stock	73	62
Corporate securities	14,836	8,109
Mortgage interest rate locks	651	35
Loans held for sale	41,855	82,114
Interest rate swaps	167	80
Mortgage servicing rights	155
Liabilities:
Interest rate swaps	326	541
Mortgage banking hedge instruments	613	39
Level II [Member] | Nonrecurring [Member]
Financial assets measured at fair value on a nonrecurring basis [Abstract]
Impaired loans	3,691	11,165
Assets [Abstract]
Other real estate owned	4,530	7,619
Level III [Member]
Mortgage-backed securities:
Mortgage interest rate locks	0	0
Loans held for sale	0	0
Mortgage servicing rights	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	485	0
Mortgage interest rate locks	0	0
Loans held for sale	0	0
Interest rate swaps	0	0
Mortgage servicing rights	0
Liabilities:
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]
Impaired loans	4,614	1,178
Assets [Abstract]
Other real estate owned	$ 0	$ 2,310