Investment Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

The following is a summary of the amortized cost and fair value of investment securities available-for-sale and investment securities held-to-maturity at December 31, 2014 and 2013:

	Investment Securities Available-for-Sale
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
December 31, 2014
U.S. Treasury securities	$	8,272	$	—	$	13	$	8,259
Government sponsored agencies	263,658		356		511		263,503
State and political subdivisions	45,157		1,087		17		46,227
Residential mortgage-backed securities	240,465		885		1,543		239,807
Collateralized mortgage obligations	145,316		261		1,194		144,383
Corporate bonds	44,930		213		48		45,095
Preferred stock	1,389		201		—		1,590
Total	$	749,187	$	3,003	$	3,326	$	748,864
December 31, 2013
Government sponsored agencies	$	93,895	$	250	$	382	$	93,763
State and political subdivisions	42,450		1,355		7		43,798
Residential mortgage-backed securities	303,495		968		5,097		299,366
Collateralized mortgage obligations	182,128		452		1,639		180,941
Corporate bonds	65,028		499		252		65,275
Preferred stock	1,389		63		25		1,427
Total	$	688,385	$	3,587	$	7,402	$	684,570

Held-to-maturity Securities

	Investment Securities Held-to-Maturity
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
December 31, 2014
State and political subdivisions	$	305,913	$	7,294	$	4,557	$	308,650
Trust preferred securities	10,500		—		3,410		7,090
Total	$	316,413	$	7,294	$	7,967	$	315,740
December 31, 2013
State and political subdivisions	$	263,405	$	5,462	$	6,846	$	262,021
Trust preferred securities	10,500		—		4,250		6,250
Total	$	273,905	$	5,462	$	11,096	$	268,271

Amortized cost and fair value of debt securities by contractual maturity

	December 31, 2014
	Amortized Cost		Fair Value
	(In thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	194,598	$	194,475
Due after one year through five years	487,952		487,511
Due after five years through ten years	61,825		61,887
Due after ten years	3,423		3,401
Preferred stock	1,389		1,590
Total	$	749,187	$	748,864
Investment Securities Held-to-Maturity:
Due in one year or less	$	37,069	$	37,222
Due after one year through five years	131,711		134,918
Due after five years through ten years	96,736		98,774
Due after ten years	50,897		44,826
Total	$	316,413	$	315,740

Summary of continuous unrealized loss position of securities

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
December 31, 2014
U.S. Treasury securities	$	8,259	$	13	$	—	$	—	$	8,259	$	13
Government sponsored agencies	166,963		406		31,927		105		198,890		511
State and political subdivisions	62,310		3,348		36,847		1,226		99,157		4,574
Residential mortgage-backed securities	17,276		52		180,194		1,491		197,470		1,543
Collateralized mortgage obligations	63,077		179		31,620		1,015		94,697		1,194
Corporate bonds	—		—		14,952		48		14,952		48
Trust preferred securities	—		—		7,090		3,410		7,090		3,410
Preferred stock	—		—		—		—		—		—
Total	$	317,885	$	3,998	$	302,630	$	7,295	$	620,515	$	11,293
December 31, 2013
Government sponsored agencies	$	47,352	$	205	$	14,031	$	177	$	61,383	$	382
State and political subdivisions	126,345		6,475		19,074		378		145,419		6,853
Residential mortgage-backed securities	274,076		5,097		—		—		274,076		5,097
Collateralized mortgage obligations	84,995		1,127		14,684		512		99,679		1,639
Corporate bonds	14,931		78		19,826		174		34,757		252
Trust preferred securities	—		—		6,250		4,250		6,250		4,250
Preferred stock	1,024		25		—		—		1,024		25
Total	$	548,723	$	13,007	$	73,865	$	5,491	$	622,588	$	18,498