Investments (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The following table presents amortized cost, gross unrealized gains and losses, and carrying values of securities available-for-sale as of the dates indicated:

	December 31, 2014									December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Residential mortgage-backed securities:
Government agency and
government-sponsored enterprise
pass-through securities	$	515,902	$	20,142	$	(372	)	$	535,672	$	691,944	$	18,012	$	(2,768	)	$	707,188
Government agency and
government-sponsored enterprise
collateralized mortgage obligations	275,513		3,513		(1,080		)	277,946		197,069		388		(4,584		)	192,873
Covered private label collateralized
mortgage obligations	26,889		7,153		(95		)	33,947		30,502		7,552		(150		)	37,904
Other private label collateralized
mortgage obligations	10,961		46		(93		)	10,914		—		—		—			—
Municipal securities	521,499		15,899		(1,282		)	536,116		459,182		1,749		(24,273		)	436,658
Corporate debt securities	110,074		597		(562		)	110,109		84,119		71		(1,483		)	82,707
Government-sponsored enterprise debt
securities	36,232		525		—			36,757		10,046		—		(174		)	9,872
Other securities	25,801		33		(118		)	25,716		27,654		2		(113		)	27,543
Total	$	1,522,871	$	47,908	$	(3,602	)	$	1,567,177	$	1,500,516	$	27,774	$	(33,545	)	$	1,494,745

Unrealized losses on investment securities

Unrealized Losses on Investment Securities

The following tables present the gross unrealized losses and fair values of securities available-for-sale that were in unrealized loss positions, for which other-than-temporary impairments have not been recognized in earnings, as of the dates indicated:

	December 31, 2014
	Less Than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(In thousands)
Residential mortgage-backed securities:
Government agency and government-
sponsored enterprise pass-through
securities	$	10,711	$	(13	)	$	27,100	$	(359	)	$	37,811	$	(372	)
Government agency and government-
sponsored enterprise collateralized
mortgage obligations	23,908		(73		)	40,652		(1,007		)	64,560		(1,080		)
Covered private label collateralized
mortgage obligations	—		—			1,000		(95		)	1,000		(95		)
Other private label collateralized
mortgage obligations	1,618		(93		)	—		—			1,618		(93		)
Municipal securities	11,854		(66		)	84,822		(1,216		)	96,676		(1,282		)
Corporate debt securities	52,071		(547		)	10,131		(15		)	62,202		(562		)
Other securities	6,440		(90		)	10,019		(28		)	16,459		(118		)
Total	$	106,602	$	(882	)	$	173,724	$	(2,720	)	$	280,326	$	(3,602	)

	December 31, 2013
	Less Than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(In thousands)
Residential mortgage-backed securities:
Government agency and government-
sponsored enterprise pass-through
securities	$	148,662	$	(2,767	)	$	32	$	(1	)	$	148,694	$	(2,768	)
Government agency and government-
sponsored enterprise collateralized
mortgage obligations	179,938		(4,486		)	4,383		(98		)	184,321		(4,584		)
Covered private label collateralized
mortgage obligations	1,640		(60		)	617		(90		)	2,257		(150		)
Municipal securities	337,208		(24,273		)	—		—			337,208		(24,273		)
Corporate debt securities	72,636		(1,483		)	—		—			72,636		(1,483		)
Government-sponsored enterprise debt
securities	9,872		(174		)	—		—			9,872		(174		)
Other securities	23,969		(113		)	—		—			23,969		(113		)
Total	$	773,925	$	(33,356	)	$	5,032	$	(189	)	$	778,957	$	(33,545	)

Investments Classified by Contractual Maturity Date

The following table presents the contractual maturities of our available-for-sale securities portfolio based on amortized cost and carrying value as of the date indicated.

	December 31, 2014
	Amortized Cost		Estimated Fair Value
	(In thousands)
Due in one year or less	$	4,567	$	4,596
Due after one year through five years	85,288		85,219
Due after five years through ten years	262,556		268,665
Due after ten years	1,170,460		1,208,697
Total securities available-for-sale	$	1,522,871	$	1,567,177

Investment Income

The following table presents the composition of our interest income on investment securities for the years indicated:

	Year Ended December 31,
	2014		2013		2012
	(In thousands)
Taxable interest	$	30,135	$	23,542	$	29,652
Non-taxable interest	13,597		11,777		5,559
Dividend income	3,613		1,604		446
Total interest income on investment securities	$	47,345	$	36,923	$	35,657