Estimated Fair Value of Financial Instruments - Summary of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Accrued interest payable	$ 825	$ 882
Carrying Value [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and due from banks, Federal funds sold and interest bearing deposits in other banks	49,534	30,659
Securities	228,766	203,763
Restricted stock	5,741	5,741
Portfolio loans, net	865,081	864,911
Loans held for sale	3,423	7,634
Accrued interest receivable	3,896	3,726
Demand, savings and money market	534,798	517,181
Certificates of deposit	504,481	482,411
Short-term borrowings	1,859	1,115
Federal Home Loan Bank advances	46,607	46,508
Junior subordinated debentures	16,238	16,238
Accrued interest payable	825	882
Estimated Fair Value [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and due from banks, Federal funds sold and interest bearing deposits in other banks	49,534	30,659
Securities	228,766	203,763
Restricted stock	5,741	5,741
Portfolio loans, net	862,836	868,716
Loans held for sale	3,446	7,891
Accrued interest receivable	3,896	3,726
Demand, savings and money market	534,798	511,665
Certificates of deposit	507,055	485,394
Short-term borrowings	1,859	1,115
Federal Home Loan Bank advances	46,763	46,828
Junior subordinated debentures	16,614	17,197
Accrued interest payable	825	882
Level 1 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and due from banks, Federal funds sold and interest bearing deposits in other banks	49,534
Securities	0	0
Restricted stock
Portfolio loans, net
Loans held for sale
Accrued interest receivable
Demand, savings and money market
Certificates of deposit
Short-term borrowings
Federal Home Loan Bank advances
Junior subordinated debentures
Accrued interest payable
Level 2 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and due from banks, Federal funds sold and interest bearing deposits in other banks
Securities	224,082	203,763
Restricted stock	5,741
Portfolio loans, net
Loans held for sale	3,446
Accrued interest receivable	3,896
Demand, savings and money market	534,798
Certificates of deposit	507,055
Short-term borrowings	1,859
Federal Home Loan Bank advances	46,763
Junior subordinated debentures	16,614
Accrued interest payable	803
Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and due from banks, Federal funds sold and interest bearing deposits in other banks
Securities	4,684	0
Restricted stock
Portfolio loans, net	862,836
Loans held for sale	0
Accrued interest receivable	0
Demand, savings and money market
Certificates of deposit
Short-term borrowings
Federal Home Loan Bank advances
Junior subordinated debentures
Accrued interest payable