Investment Securities (Tables)

12 Months Ended

Dec. 31, 2012

Investment Securities [Abstract]

Amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities

The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2012 are summarized as follows:

	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
Investment securities available-for-sale:
U.S. Treasury securities	$	997	$	8	$	—		$	1,005
Securities of U.S. government agencies and corporations		28,200		105		—			28,305
Obligations of states and political subdivisions		27,226		1,563		(3	)		28,786
Collateralized mortgage obligations		8,156		123		(1	)		8,278
Mortgage-backed securities		116,855		1,524		(262	)		118,117
Total debt securities	$	181,434	$	3,323	$	(266	)	$	184,491

The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2011 are summarized as follows:

	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
Investment securities available-for-sale:
U.S. Treasury securities	$	2,294	$	20	$	—		$	2,314
Securities of U.S. government agencies and corporations		36,820		203		(9	)		37,014
Obligations of states and political subdivisions		19,735		894		(12	)		20,617
Mortgage-backed securities		100,130		586		(420	)		100,296
Total debt securities	$	158,979	$	1,703	$	(441	)	$	160,241

Amortized cost and estimated fair value of debt and other securities by contractual maturity

The amortized cost and estimated fair value of debt and other securities at December 31, 2012, by contractual maturity, are shown in the following table:

	Amortized cost		Estimated fair value
Due in one year or less	$	18,178	$	18,262
Due after one year through five years		124,939		126,404
Due after five years through ten years		29,444		30,310
Due after ten years		8,873		9,515
	$	181,434	$	184,491

Analysis of gross unrealized losses of the available-for-sale investment securities portfolio

An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2012, follows:

	Less than 12 months					12 months or more				Total
	Fair Value		Unrealized losses			Fair Value		Unrealized losses		Fair Value		Unrealized losses
Obligations of states and political subdivisions	$	1,262	$	(3	)	$	—	$	—	$	1,262		(3	)
Collateralized mortgage obligations		1,198		(1	)		—		—		1,198		(1	)
Mortgage-backed securities		29,779		(262	)		—		—		29,779		(262	)
Total	$	32,239	$	(266	)	$	—	$	—	$	32,239	$	(266	)

An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2011, follows:

	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized losses			Fair Value		Unrealized losses			Fair Value		Unrealized losses
Securities of U.S. government agencies and corporations	$	4,034	$	(9	)	$	—	$	—		$	4,034	$	(9	)
Obligations of states and political subdivisions		506		(10	)		167		(2	)		673		(12	)
Mortgage-backed securities		47,861		(420	)		—		—			47,861		(420	)
Total	$	52,401	$	(439	)	$	167	$	(2	)	$	52,568	$	(441	)