Investment Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments Schedule [Abstract]

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

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

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
(In Thousands)
Available-for-Sale Securities:
June 30, 2016
GSE	$	39,080	$	147	$	—	$	39,227
CMO		259,834		6,520		32		266,322
FNMA MBS		336,103		11,144		23		347,224
FHLMC MBS		84,550		2,343		—		86,893
GNMA MBS		26,181		641		29		26,793
	$	745,748	$	20,795	$	84	$	766,459
December 31, 2015
GSE	$	31,041	$	—	$	127	$	30,914
CMO		253,189		713		2,414		251,488
FNMA MBS		320,105		1,081		2,715		318,471
FHLMC MBS		99,350		405		313		99,442
GNMA MBS		20,387		420		93		20,714
	$	724,072	$	2,619	$	5,662	$	721,029
(In Thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
Held-to-Maturity Securities (a)
June 30, 2016
State and political subdivisions	$	166,398	$	6,654	$	20	$	173,032
December 31, 2015
State and political subdivisions	$	165,862	$	1,943	$	62	$	167,743

(a) Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value at the time of transfer. The amortized cost of held-to-maturity securities included net unrealized gains of $2.6 million and $2.9 million at June 30, 2016 and December 31, 2015, respectively, related to securities transferred, which are offset in Accumulated Other Comprehensive Income, net of tax.

Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity

The scheduled maturities of investment securities available-for-sale and held-to-maturity at June 30, 2016 and December 31, 2015 are presented in the table below:

	Available-for-Sale
(In Thousands)	Amortized Cost		Fair Value
June 30, 2016
Within one year	$	10,994	$	11,009
After one year but within five years		28,086		28,218
After five years but within ten years		239,335		248,220
After ten years		467,333		479,012
	$	745,748	$	766,459
December 31, 2015
Within one year	$	3,997	$	3,995
After one year but within five years		30,009		29,840
After five years but within ten years		218,023		215,018
After ten years		472,043		472,176
	$	724,072	$	721,029
	Held-to-Maturity
(In Thousands)	Amortized Cost		Fair Value
June 30, 2016
After one year but within five years		3,179		3,212
After five years but within ten years		9,520		9,796
After ten years		153,699		160,024
	$	166,398	$	173,032
December 31, 2015
Within one year	$	1,486	$	1,488
After one year but within five years		3,465		3,456
After five years but within ten years		7,939		8,045
After ten years		152,972		154,754
	$	165,862	$	167,743

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

For these investment securities with unrealized losses, the table below shows our gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at June 30, 2016.

	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
(In Thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available-for-sale securities:
CMO		4,992		15		5,383		17		10,375		32
FNMA MBS		4,119		23		—		—		4,119		23
GNMA MBS		8,539		29		—		—		8,539		29
Total temporarily impaired investments	$	17,650	$	67	$	5,383	$	17	$	23,033	$	84
	Less than 12 months				12 months or longer				Total
(In Thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Held-to-maturity securities:
State and political subdivisions	$	—	$	—	$	2,449	$	20	$	2,449	$	20
Total temporarily impaired investments	$	—	$	—	$	2,449	$	20	$	2,449	$	20

For these investment securities with unrealized losses, the table below shows our gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at December 31, 2015.

	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
(In Thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available-for-sale securities:
GSE	$	30,914	$	127	$	—	$	—	$	30,914	$	127
CMO		139,486		1,703		26,536		711		166,022		2,414
FNMA MBS		214,465		2,715		—		—		214,465		2,715
FHLMC MBS		41,791		136		4,025		177		45,816		313
GNMA MBS		4,073		29		2,377		64		6,450		93
Total temporarily impaired investments	$	430,729	$	4,710	$	32,938	$	952	$	463,667	$	5,662
	Less than 12 months				12 months or longer				Total
(In Thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Held-to-maturity securities:
State and political subdivisions	$	9,845	$	62	$	—	$	—	$	9,845	$	62
Total temporarily impaired investments	$	9,845	$	62	$	—	$	—	$	9,845	$	62