Investment Securities (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Amortized Cost And Fair Values Of Investment Securities, With Gross Unrealized Gains And Losses

(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
December 31, 2012
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	281,746	$	4,364	$	(386	)	$	285,724
Obligations of state and political subdivisions		120,680		6,573		(178	)		127,075
Mortgage backed securities		1,303,030		29,108		(1,482	)		1,330,656
Other securities		1,460		89		—			1,549
Total securities available for sale	$	1,706,916	$	40,134	$	(2,046	)	$	1,745,004
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	69,949	$	1,244	$	—		$	71,193
Obligations of state and political subdivisions		88,909		4,730		(113	)		93,526
Mortgage backed securities		46,204		728		(153	)		46,779
Total securities held to maturity	$	205,062	$	6,702	$	(266	)	$	211,498
December 31, 2011
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	336,859	$	5,633	$	(4	)	$	342,488
Obligations of state and political subdivisions		137,503		6,500		(198	)		143,805
Mortgage backed securities		1,289,775		28,317		(718	)		1,317,374
Other securities		1,460		78		—			1,538
Total securities available for sale	$	1,765,597	$	40,528	$	(920	)	$	1,805,205
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	85,172	$	1,921	$	—		$	87,093
Obligations of state and political subdivisions		81,053		3,682		(57	)		84,678
Mortgage backed securities		26,539		800		—			27,339
Total securities held to maturity	$	192,764	$	6,403	$	(57	)	$	199,110

Schedule Of Exposure To Investment Security Issuers Exceed Ten Percentage Of Shareholders' Equity

(Dollars in thousands)	Amortized Cost		Market Value
Federal National Mortgage Association (Fannie Mae)	$	911,752	$	930,452
Government National Mortgage Association (Ginnie Mae)		205,389		209,692
Federal Home Loan Mortgage Corporation (Freddie Mac)		503,417		511,348
Total	$	1,620,558	$	1,651,492

Schedule Of Securities With Gross Unrealized Losses Aggregated By Investment Category

	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
December 31, 2012
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(386	)	$	59,741	$	—		$	—	$	(386	)	$	59,741
Obligations of state and political subdivisions		—			—		(178	)		1,094		(178	)		1,094
Mortgage backed securities		(1,473	)		180,027		(9	)		3,919		(1,482	)		183,946
Total securities available for sale	$	(1,859	)	$	239,768	$	(187	)	$	5,013	$	(2,046	)	$	244,781
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	—		$	—	$	—		$	—
Obligations of state and political subdivisions		(113	)		8,242		—			—		(113	)		8,242
Mortgage backed securities		(153	)		16,262		—			—		(153	)		16,262
Total securities held to maturity	$	(266	)	$	24,504	$	—		$	—	$	(266	)	$	24,504
December 31, 2011
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(4	)	$	9,996	$	—		$	—	$	(4	)	$	9,996
Obligations of state and political subdivisions		(11	)		1,104		(187	)		1,085		(198	)		2,189
Mortgage backed securities		(545	)		147,803		(173	)		21,679		(718	)		169,482
Total securities available for sale	$	(560	)	$	158,903	$	(360	)	$	22,764	$	(920	)	$	181,667
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	—		$	—	$	—		$	—
Obligations of state and political subdivisions		(26	)		2,354		(31	)		1,297		(57	)		3,651
Mortgage backed securities		—			—		—			—		—			—
Total securities held to maturity	$	(26	)	$	2,354	$	(31	)	$	1,297	$	(57	)	$	3,651

Schedule Of Other-Than-Temporarily Impaired Investment Security Portion Of Unrealized Loss Recognized In Other Comprehensive Income

(Dollars in thousands)	December 31,
	2012			2011			2010
Balance, beginning of period	$	(1,273	)	$	(764	)	$	(247	)
Credit losses on securities not previously considered other-than-temporarily impaired		—			—			(517	)
Credit losses on securities for which OTTI was previously recognized		—			(509	)		—
Reduction for securities sold/settle during the period		—			—			—
Balance, end of period	$	(1,273	)	$	(1,273	)	$	(764	)

Schedule Of Amortized Cost And Estimated Fair Value By Maturity Of Investment Securities

	Securities							Securities
	Available for Sale							Held to Maturity
(Dollars in thousands)	Weighted Average Yield			Amortized Cost		Estimated Fair Value		Weighted Average Yield			Amortized Cost		Estimated Fair Value
Within one year or less		1.52	%	$	18,409	$	18,541		1.61	%	$	20,797	$	20,916
One through five years		1.85			138,725		141,448		2.04			56,358		57,708
After five through ten years		2.14			518,218		532,684		2.50			26,215		27,500
Over ten years		1.78			1,031,564		1,052,331		2.98			101,692		105,374
Totals		1.89	%	$	1,706,916	$	1,745,004		2.52	%	$	205,062	$	211,498

Schedule Of Realized Gains And Losses From Sale Of Securities Classified As Available For Sale

	Years Ended December 31,
(Dollars in thousands)	2012			2011			2010
Realized gains	$	3,754		$	3,429		$	5,172
Realized losses		(15	)		(7	)		—
Net realized gains	$	3,739		$	3,422		$	5,172

Schedule Of Securities In Other Assets On Company's Consolidated Balance Sheets

(Dollars in thousands)	2012		2011
Federal Home Loan Bank (FHLB) stock	$	16,860	$	32,145
Federal Reserve Bank (FRB) stock		28,155		26,809
First National Bankers Bankshares, Inc. (FNBB) stock		899		899
Other investments		302		302
Total equity securities	$	46,216	$	60,155