Investment Securities (Tables)

9 Months Ended

Sep. 30, 2012

Investment Securities

Schedule of amortized cost, gross unrealized gains and losses, and fair value of investment securities

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
(dollars in thousands)	Cost		Gains		Losses			Value
September30, 2012
Available-for-Sale:
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	990,957	$	15,193	$	(4	)	$	1,006,146
Debt Securities Issued by States and Political Subdivisions	682,054		32,990		(1		)	715,043
Debt Securities Issued by Corporations	82,567		2,341		(10		)	84,898
Mortgage-Backed Securities Issued by
Government Agencies	1,241,154		35,876		(615		)	1,276,415
U.S. Government-Sponsored Enterprises	39,327		2,380		-			41,707
Total Mortgage-Backed Securities	1,280,481		38,256		(615		)	1,318,122
Total	$	3,036,059	$	88,780	$	(630	)	$	3,124,209
Held-to-Maturity:
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	179,451	$	5,802	$	-		$	185,253
Mortgage-Backed Securities Issued by
Government Agencies	3,260,932		104,407		(22		)	3,365,317
U.S. Government-Sponsored Enterprises	34,876		2,551		-			37,427
Total Mortgage-Backed Securities	3,295,808		106,958		(22		)	3,402,744
Total	$	3,475,259	$	112,760	$	(22	)	$	3,587,997
December31, 2011
Available-for-Sale:
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	1,220,282	$	11,204	$	(468	)	$	1,231,018
Debt Securities Issued by States and Political Subdivisions	391,276		15,783		-			407,059
Debt Securities Issued by Corporations	97,917		607		(2,137		)	96,387
Mortgage-Backed Securities Issued by
Government Agencies	1,618,913		38,066		(1,107		)	1,655,872
U.S. Government-Sponsored Enterprises	58,548		3,001		-			61,549
Total Mortgage-Backed Securities	1,677,461		41,067		(1,107		)	1,717,421
Total	$	3,386,936	$	68,661	$	(3,712	)	$	3,451,885
Held-to-Maturity:
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	179,474	$	6,704	$	-		$	186,178
Mortgage-Backed Securities Issued by
Government Agencies	3,429,038		89,801		(2,918		)	3,515,921
U.S. Government-Sponsored Enterprises	49,284		2,823		-			52,107
Total Mortgage-Backed Securities	3,478,322		92,624		(2,918		)	3,568,028
Total	$	3,657,796	$	99,328	$	(2,918	)	$	3,754,206

Analysis of the contractual maturities of investment securities

(dollars in thousands)	Amortized Cost		Fair Value
Available-for-Sale:
Due in One Year or Less	$	515,969	$	517,705
Due After One Year Through Five Years	234,406		242,906
Due After Five Years Through Ten Years	302,891		315,529
Due After Ten Years	702,312		729,947
	1,755,578		1,806,087
Mortgage-Backed Securities Issued by
Government Agencies	1,241,154		1,276,415
U.S. Government-Sponsored Enterprises	39,327		41,707
Total Mortgage-Backed Securities	1,280,481		1,318,122
Total	$	3,036,059	$	3,124,209
Held-to-Maturity:
Due After One Year Through Five Years	$	179,451	$	185,253
Mortgage-Backed Securities Issued by
Government Agencies	3,260,932		3,365,317
U.S. Government-Sponsored Enterprises	34,876		37,427
Total Mortgage-Backed Securities	3,295,808		3,402,744
Total	$	3,475,259	$	3,587,997

Schedule of investment securities in an unrealized loss position

	Less Than 12 Months					12 Months or Longer					Total
			Gross					Gross					Gross
			Unrealized					Unrealized					Unrealized
(dollars in thousands)	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
September30, 2012
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	260	$	(1	)	$	626	$	(3	)	$	886	$	(4	)
Debt Securities Issued by States and Political Subdivisions	100		(1		)	-		-			100		(1		)
Debt Securities Issued by Corporations	-		-			9,990		(10		)	9,990		(10		)
Mortgage-Backed Securities Issued by Government Agencies	57,368		(533		)	12,663		(104		)	70,031		(637		)
Total	$	57,728	$	(535	)	$	23,279	$	(117	)	$	81,007	$	(652	)
December31, 2011
Debt Securities Issued by the U.S. Treasury and Government Agencies	$	127,644	$	(464	)	$	920	$	(4	)	$	128,564	$	(468	)
Debt Securities Issued by Corporations	38,059		(2,137		)	-		-			38,059		(2,137		)
Mortgage-Backed Securities Issued by Government Agencies	727,726		(3,751		)	34,824		(274		)	762,550		(4,025		)
Total	$	893,429	$	(6,352	)	$	35,744	$	(278	)	$	929,173	$	(6,630	)