Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Fair Value of Investment Securities

The majority of securities held are publicly traded, and the estimated fair values were obtained from an independent pricing service based upon market quotes.


	June 30, 2013
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss			Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Government agency	$	377,493	$	62	$	(16,223	)	$	361,332		14.86	%
Residential mortgage-backed securities		1,040,904		11,499		(15,303	)		1,037,100		42.65	%
CMO’s / REMIC’s - residential		420,465		6,159		(731	)		425,893		17.52	%
Municipal bonds		580,792		24,659		(3,120	)		602,331		24.77	%
Other securities		5,000		—		(75	)		4,925		0.20	%

Total investment securities	$	2,424,654	$	42,379	$	(35,452	)	$	2,431,581		100.00	%


	December 31, 2012
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss			Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Government agency	$	357,960	$	1,588	$	(248	)	$	359,300		14.67	%
Residential mortgage-backed securities		862,196		25,529		(127	)		887,598		36.24	%
CMO’s / REMIC’s - residential		565,968		7,402		(1,410	)		571,960		23.35	%
Municipal bonds		583,692		41,920		(183	)		625,429		25.53	%
Other securities		5,000		100		—			5,100		0.21	%

Total investment securities	$	2,374,816	$	76,539	$	(1,968	)	$	2,449,387		100.00	%

Summary of Continuous Loss Position of Securities

The tables below show the Company’s investment securities’ gross unrealized losses and fair value by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2013 and December 31, 2012. The Company has reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary.


	June 30, 2013
	Less Than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Available-for-sale:
Government agency	$	320,167	$	16,223	$	—	$	—	$	320,167	$	16,223
Residential mortgage-backed securities		495,949		15,303		—		—		495,949		15,303
CMO / REMICs - residential		63,857		606		20,706		125		84,563		731
Municipal bonds		50,615		2,921		2,079		199		52,694		3,120
Other securities		4,925		75		—		—		4,925		75

Total	$	935,513	$	35,128	$	22,785	$	324	$	958,298	$	35,452


	December 31, 2012
	Less Than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Available-for-sale:
Government agency	$	51,134	$	248	$	—	$	—	$	51,134	$	248
Residential mortgage-backed securities		55,118		127		—		—		55,118		127
CMO / REMICs - residential		74,784		572		69,042		838		143,826		1,410
Municipal bonds		13,110		162		975		21		14,085		183
Other securities		—		—		—		—		—		—

Total	$	194,146	$	1,109	$	70,017	$	859	$	264,163	$	1,968

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Mortgage-backed securities and CMO/REMICs are included in maturity categories based upon estimated prepayment speeds.


	June 30, 2013
	Amortized Cost		Fair Value		Weighted- Average Yield
	(Dollars in thousands)
Available-for-sale:
Due in one year or less	$	164,603	$	166,925		1.73	%
Due after one year through five years		1,675,196		1,694,138		2.14	%
Due after five years through ten years		529,570		515,942		2.37	%
Due after ten years		55,285		54,576		3.49	%

Total	$	2,424,654	$	2,431,581		2.20	%

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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