Securities (Tables)

9 Months Ended

Sep. 30, 2014

Available-for-sale Securities [Abstract]

Securities Available for Sale

The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
September 30, 2014
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	867,583	$	7,950	$	(13,067	)	$	862,466
State and municipal securities	376,862		14,101		(1,466		)	389,497
U.S. government agency and government-sponsored enterprise securities	339,152		467		(5,620		)	333,999
U.S. government securities	20,903		1		(600		)	20,304
Other securities	5,284		22		(161		)	5,145
Total	$	1,609,784	$	22,541	$	(20,914	)	$	1,611,411
December 31, 2013
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	961,442	$	10,640	$	(23,674	)	$	948,408
State and municipal securities	357,013		11,450		(3,993		)	364,470
U.S. government agency and government-sponsored enterprise securities	335,671		434		(10,066		)	326,039
U.S. government securities	21,081		—		(967		)	20,114
Other securities	5,284		27		(231		)	5,080
Total	$	1,680,491	$	22,551	$	(38,931	)	$	1,664,111

Schedule of gross realized gains and losses on sales and calls of securities available for sale

The following table provides the gross realized gains and losses on the sales of securities for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
	(in thousands)
Gross realized gains	$	33	$	—	$	552	$	632
Gross realized losses	—		—		—		(170		)
Net realized gains	$	33	$	—	$	552	$	462

Schedule of Contractual Maturities of Investment Securities Available for Sale

The scheduled contractual maturities of investment securities available for sale at September 30, 2014 are presented as follows:

	September 30, 2014
	Amortized Cost		Fair Value
	(in thousands)
Due within one year	$	12,863	$	12,945
Due after one year through five years	357,261		356,376
Due after five years through ten years	443,780		443,165
Due after ten years	790,596		793,779
Other securities with no stated maturity	5,284		5,146
Total investment securities available-for-sale	$	1,609,784	$	1,611,411

Carrying Value of Securities Pledged As Collateral

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

	September 30, 2014
	(in thousands)
Washington and Oregon State to secure public deposits	$	286,337
Federal Reserve Bank to secure borrowings	41,352
Other securities pledged	44,488
Total securities pledged as collateral	$	372,177

Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses

The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2014 and December 31, 2013:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
September 30, 2014
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	162,583	$	(1,219	)	$	283,292	$	(11,848	)	$	445,875	$	(13,067	)
State and municipal securities	29,307		(170		)	52,322		(1,296		)	81,629		(1,466		)
U.S. government agency and government-sponsored enterprise securities	50,689		(201		)	231,082		(5,419		)	281,771		(5,620		)
U.S. government securities	—		—			19,253		(600		)	19,253		(600		)
Other securities	—		—			5,109		(161		)	5,109		(161		)
Total	$	242,579	$	(1,590	)	$	591,058	$	(19,324	)	$	833,637	$	(20,914	)
December 31, 2013
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	492,921	$	(10,991	)	$	121,303	$	(12,684	)	$	614,224	$	(23,675	)
State and municipal securities	112,400		(3,069		)	13,815		(923		)	126,215		(3,992		)
U.S. government agency and government-sponsored enterprise securities	260,001		(8,063		)	28,447		(2,003		)	288,448		(10,066		)
U.S. government securities	20,114		(967		)	—		—			20,114		(967		)
Other securities	2,257		(58		)	2,783		(173		)	5,040		(231		)
Total	$	887,693	$	(23,148	)	$	166,348	$	(15,783	)	$	1,054,041	$	(38,931	)