Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment securities available-for-sale [Abstract]
Amortized cost	$ 181,434	$ 158,979
Unrealized gains	3,323	1,703
Unrealized losses	(266)	(441)
Estimated fair value	184,491	160,241
Gross realized gains from available-for-sale securities	20	930	672
Gross realized losses from available-for-sale securities	12	0	9
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Due in one year or less, Amortized cost	18,178
Due after one year through five years, Amortized cost	124,939
Due after five years through ten years, Amortized cost	29,444
Due after ten years, Amortized cost	8,873
Amortized cost	181,434	158,979
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Due in one year or less, Estimated fair value	18,262
Due after one year through five years, Estimated fair value	126,404
Due after five years through ten years, Estimated fair value	30,310
Due after ten years, Estimated fair value	9,515
Estimated fair value	184,491	160,241
Mortgage backed securities with expected maturities due after one year through five years	106,913
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	32,239	52,401
Less than 12 months, Unrealized losses	(266)	(439)
12 months or more, Fair Value	0	167
12 Months or more, Unrealized losses	0	(2)
Total Fair Value	32,239	52,568
Total Unrealized losses	(266)	(441)
Investment securities in an unrealized loss position less than 12 months	21
Investment securities pledged as collateral	32,227	34,206
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	997	2,294
Unrealized gains	8	20
Unrealized losses	0	0
Estimated fair value	1,005	2,314
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Amortized cost	997	2,294
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Estimated fair value	1,005	2,314
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	28,200	36,820
Unrealized gains	105	203
Unrealized losses	0	(9)
Estimated fair value	28,305	37,014
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Amortized cost	28,200	36,820
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Estimated fair value	28,305	37,014
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value		4,034
Less than 12 months, Unrealized losses		(9)
12 months or more, Fair Value		0
12 Months or more, Unrealized losses		0
Total Fair Value		4,034
Total Unrealized losses		(9)
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	27,226	19,735
Unrealized gains	1,563	894
Unrealized losses	(3)	(12)
Estimated fair value	28,786	20,617
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Amortized cost	27,226	19,735
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Estimated fair value	28,786	20,617
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	1,262	506
Less than 12 months, Unrealized losses	(3)	(10)
12 months or more, Fair Value	0	167
12 Months or more, Unrealized losses	0	(2)
Total Fair Value	1,262	673
Total Unrealized losses	(3)	(12)
Collateralized mortgage obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	8,156
Unrealized gains	123
Unrealized losses	(1)
Estimated fair value	8,278
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Amortized cost	8,156
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Estimated fair value	8,278
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	1,198
Less than 12 months, Unrealized losses	(1)
12 months or more, Fair Value	0
12 Months or more, Unrealized losses	0
Total Fair Value	1,198
Total Unrealized losses	(1)
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	116,855	100,130
Unrealized gains	1,524	586
Unrealized losses	(262)	(420)
Estimated fair value	118,117	100,296
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, by Contractual Maturity [Abstract]
Amortized cost	116,855	100,130
Available-for-sale Securities, Debt Maturities, Fair Value, by Contractual Maturity [Abstract]
Estimated fair value	118,117	100,296
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	29,779	47,861
Less than 12 months, Unrealized losses	(262)	(420)
12 months or more, Fair Value	0	0
12 Months or more, Unrealized losses	0	0
Total Fair Value	29,779	47,861
Total Unrealized losses	$ (262)	$ (420)