Investments in debt and equity securities available-for-sale (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Amortized Costs and Fair Values

The amortized costs and fair values follow:

	June 30, 2015		December 31, 2014
	Amortized costs	Fair values	Amortized costs	Fair values
	($000 omitted)
Debt securities:
Municipal	61,493	62,022	60,656	61,689
Corporate	289,187	297,040	296,578	308,691
Foreign	157,495	161,346	163,099	166,685
U.S. Treasury Bonds	13,804	14,111	14,337	14,802
Equity securities	29,347	32,264	22,710	28,236
	551,326	566,783	557,380	580,103

Gross Unrealized Gains and Losses

Gross unrealized gains and losses were:

	June 30, 2015		December 31, 2014
	Gains	Losses	Gains	Losses
	($000 omitted)
Debt securities:
Municipal	834	305	1,125	92
Corporate	10,158	2,305	12,559	446
Foreign	4,111	260	3,690	104
U.S. Treasury Bonds	313	6	492	27
Equity securities	3,878	961	5,982	456
	19,294	3,837	23,848	1,125

Debt Securities According to Contractual Terms

Debt securities as of June 30, 2015 mature, according to their contractual terms, as follows (actual maturities may differ due to call or prepayment rights):

	Amortized costs	Fair values
	($000 omitted)
In one year or less	44,224	44,589
After one year through five years	226,379	232,501
After five years through ten years	213,073	218,150
After ten years	38,303	39,279
	521,979	534,519

Gross Unrealized Losses on Investments and Fair Values of Related Securities

Gross unrealized losses on investments and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2015, were:

	Less than 12 months		More than 12 months		Total
	Losses	Fair values	Losses	Fair values	Losses	Fair values
	($000 omitted)
Debt securities:
Municipal	247	12,126	58	11,430	305	23,556
Corporate	1,472	22,688	833	31,840	2,305	54,528
Foreign	106	4,670	154	4,826	260	9,496
U.S. Treasury Bonds	4	1,196	2	3,597	6	4,793
Equity securities	961	11,637	—	—	961	11,637
	2,790	52,317	1,047	51,693	3,837	104,010

Gross unrealized losses on investments and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2014, were:

	Less than 12 months		More than 12 months		Total
	Losses	Fair values	Losses	Fair values	Losses	Fair values
	($000 omitted)
Debt securities:
Municipal	1	2,673	91	12,076	92	14,749
Corporate	107	7,167	339	26,545	446	33,712
Foreign	11	34,236	93	6,446	104	40,682
U.S. Treasury Bonds	—	—	27	3,694	27	3,694
Equity securities	456	6,540	—	—	456	6,540
	575	50,616	550	48,761	1,125	99,377