Investment Securities (Tables)

3 Months Ended

Mar. 31, 2014

Investments Debt And Equity Securities [Abstract]

Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale Investment Securities

The following tables detail the amortized cost and the estimated fair value of our available-for-sale investment securities. None of our investment securities is classified as trading or held-to-maturity.

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(In Thousands)
Available-for-sale securities:
March 31, 2014:
State and political subdivisions	$	111,583	$	1,475	$	(2,483	)	$	110,575
U.S. Government and government sponsored enterprises (“GSE”)		32,022		73		(12	)		32,083
Collateralized Mortgage Obligation (“CMO”)		114,037		30		(3,984	)		110,083
Federal National Mortgage Association (“FNMA”) Mortgage-Backed Securities (“MBS”)		380,387		87		(10,004	)		370,470
Federal Home Loan Mortgage Corporation MBS (“FHLMC”)		136,274		26		(3,401	)		132,899
Government National Mortgage Association MBS (“GNMA”)		104,361		367		(1,587	)		103,141
	$	878,664	$	2,058	$	(21,471	)	$	859,251
December 31, 2013
State and political subdivisions		105,354		257		(5,426	)		100,185
GSE		32,082		93		(17	)		32,158
CMO		103,064		28		(5,535	)		97,557
FNMA MBS		382,909		20		(15,801	)		367,128
FHLMC MBS		129,460		29		(4,994	)		124,495
GNMA MBS		97,830		743		(2,981	)		95,592
	$	850,699	$	1,170	$	(34,754	)	$	817,115

Schedule of Maturities of Investment Securities Available-for-Sale

The scheduled maturities of investment securities available-for-sale at March 31, 2014 and December 31, 2013 were as follows:

	Available-for-Sale
	Amortized		Fair
	Cost		Value
	(In Thousands)
March 31, 2014
Within one year	$	16,194	$	16,233
After one year but within five years		40,883		41,046
After five years but within ten years		294,552		286,670
After ten years		527,035		515,302
	$	878,664	$	859,251
December 31, 2013
Within one year	$	16,319	$	16,378
After one year but within five years		19,761		19,986
After five years but within ten years		229,033		217,911
After ten years		585,586		562,840
	$	850,699	$	817,115

Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category

The tables below show our investment securities’ gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at March 31, 2014 and December 31, 2013.

	Less than 12 months				12 months or longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
	(In Thousands)
Available-for-sale
State and political subdivisions	$	42,003	$	1,722	$	13,374	$	761	$	55,377	$	2,483
GSE		5,982		12		—		—		5,982		12
CMO		82,229		2,719		25,974		1,265		108,203		3,984
FNMA MBS		341,483		8,989		17,955		1,015		359,438		10,004
FHLMC MBS		116,004		2,700		11,593		701		127,597		3,401
GNMA MBS		65,773		966		18,433		621		84,206		1,587
Total temporarily impaired investments	$	653,474	$	17,108	$	87,329	$	4,363	$	740,803	$	21,471
	Less than 12 months				12 months or longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
	(In Thousands)
Available-for-sale
State and political subdivisions	$	83,036	$	5,426	$	—	$	—	$	83,036	$	5,426
GSE		3,972		13		2,001		4		5,973		17
CMO		73,109		4,173		21,590		1,362		94,699		5,535
FNMA MBS		346,266		14,386		17,800		1,415		364,066		15,801
FHLMC MBS		116,732		4,548		7,307		446		124,039		4,994
GNMA MBS		57,076		1,897		18,829		1,084		75,905		2,981
Total temporarily impaired investments	$	680,191	$	30,443	$	67,527	$	4,311	$	747,718	$	34,754