Estimated Fair Value of Financial Instruments - Summary of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Accrued interest payable	$ 828	$ 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	54,954	30,659
Securities	223,173	203,763
Restricted stock	5,741	5,741
Portfolio loans, net	872,125	864,911
Loans held for sale	6,250	7,634
Accrued interest receivable	4,018	3,726
Demand, savings and money market	533,393	517,181
Certificates of deposit	515,783	482,411
Short-term borrowings	1,889	1,115
Federal Home Loan Bank advances	46,557	46,508
Junior subordinated debentures	16,238	16,238
Accrued interest payable	803	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	54,954	30,659
Securities	223,173	203,763
Restricted stock	5,741	5,741
Portfolio loans, net	877,068	868,716
Loans held for sale	6,369	7,891
Accrued interest receivable	4,018	3,726
Demand, savings and money market	528,329	511,665
Certificates of deposit	519,290	485,394
Short-term borrowings	1,889	1,115
Federal Home Loan Bank advances	46,733	46,828
Junior subordinated debentures	17,010	17,197
Accrued interest payable	803	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	54,954
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	218,489	203,763
Restricted stock	5,741
Portfolio loans, net
Loans held for sale	6,369
Accrued interest receivable	4,018
Demand, savings and money market	528,329
Certificates of deposit	519,290
Short-term borrowings	1,889
Federal Home Loan Bank advances	46,733
Junior subordinated debentures	17,010
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	877,068
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