Securities (Tables)

12 Months Ended

Dec. 31, 2012

Securities [Abstract]

Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2012
Available-for-sale
Obligations of states and political subdivisions	$	31,112	$	1,928	$	-		$	33,040
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises		345,528		12,699		(79	)		358,148
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises		375,627		6,181		(120	)		381,688
Private issue collateralized mortgage obligations		8,871		-		(697	)		8,174
Total securities available-for-sale	$	761,138	$	20,808	$	(896	)	$	781,050
December 31, 2011
Available-for-sale
Obligations of U.S. government sponsored enterprises	$	29,996	$	116	$	(5	)	$	30,107
Obligations of states and political subdivisions		37,138		2,620		-			39,758
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises		361,073		15,861		-			376,934
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises		127,153		1,628		(331	)		128,450
Private issue collateralized mortgage obligations		12,557		-		(1,916	)		10,641
Total debt securities		567,917		20,225		(2,252	)		585,890
Equity securities		5,000		-		(854	)		4,146
Total securities available-for-sale	$	572,917	$	20,225	$	(3,106	)	$	590,036

Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position

	Less Than 12 Months					12 Months or More					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
December 31, 2012
Mortgage-backed securities	$	42,782	$	(79	)	$	-	$	-		$	42,782	$	(79	)
Collateralized mortgage obligations		73,098		(120	)		-		-			73,098		(120	)
Private issue collateralized mortgage obligations		-		-			8,174		(697	)		8,174		(697	)
Total	$	115,880	$	(199	)	$	8,174	$	(697	)	$	124,054	$	(896	)
December 31, 2011
U.S. government sponsored enterprises	$	9,995	$	(5	)	$	-	$	-		$	9,995	$	(5	)
Collateralized mortgage obligations		37,994		(331	)		-		-			37,994		(331	)
Private issue collateralized mortgage obligations		-		-			10,641		(1,916	)		10,641		(1,916	)
Equity securities		-		-			4,146		(854	)		4,146		(854	)
Total	$	47,989	$	(336	)	$	14,787	$	(2,770	)	$	62,776	$	(3,106	)

Company's Sales of Securities

Years Ended December 31,
	2012			2011			2010
Available for sale
Proceeds from sales of securities	$	115,493		$	54,600		$	4,210
Gross realized gains		2,826			2,258			-
Gross realized (losses)		(289	)		(73	)		(188	)
Other-than-temporary impairment of securities		(39	)		(109	)		(221	)

Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity

Amortized Cost			Fair Value
Available-for-sale
Due in one year or less	$	3,395		$	3,438
Due after one year through five years		21,520			22,342
Due after five years through ten years		141,215			146,362
Due after ten years		595,008			608,908
	$	761,138		$	781,050