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

9 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Amortized Costs and Fair Values

The amortized costs and fair values follow:

	September 30, 2014		December 31, 2013
	Amortized costs	Fair values	Amortized costs	Fair values
	($000 omitted)
Debt securities:
Municipal	54,209	55,186	47,808	47,252
Corporate	292,208	303,115	285,104	291,832
Foreign	169,169	170,434	164,146	162,367
U.S. Treasury Bonds	13,819	14,369	14,334	15,197
Equity securities	17,663	22,509	17,441	20,695
	547,068	565,613	528,833	537,343

Gross Unrealized Gains and Losses

Gross unrealized gains and losses were:

	September 30, 2014		December 31, 2013
	Gains	Losses	Gains	Losses
	($000 omitted)
Debt securities:
Municipal	1,097	120	258	813
Corporate	11,958	1,051	9,955	3,228
Foreign	1,601	336	363	2,142
U.S. Treasury Bonds	590	40	924	60
Equity securities	5,210	364	3,264	11
	20,456	1,911	14,764	6,254

Debt Securities According to Contractual Terms

Debt securities as of September 30, 2014 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	1,610	1,627
After one year through five years	262,946	268,276
After five years through ten years	230,273	236,883
After ten years	34,576	36,318
	529,405	543,104

Gross Unrealized Losses on Investments and Fair Values of Related Securities

As of September 30, 2014, 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, were:

	Less than 12 months		More than 12 months		Total
	Losses	Fair values	Losses	Fair values	Losses	Fair values
	($000 omitted)
Debt securities:
Municipal	2	494	118	10,747	120	11,241
Corporate	123	21,044	928	34,704	1,051	55,748
Foreign	24	42,924	312	22,016	336	64,940
U.S. Treasury Bonds	1	241	39	3,555	40	3,796
Equity securities	364	1,090	—	—	364	1,090
	514	65,793	1,397	71,022	1,911	136,815

As of December 31, 2013, 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, were:

	Less than 12 months		More than 12 months		Total
	Losses	Fair values	Losses	Fair values	Losses	Fair values
	($000 omitted)
Debt securities:
Municipal	770	27,686	43	628	813	28,314
Corporate	1,682	66,776	1,546	21,710	3,228	88,486
Foreign	1,539	63,039	603	53,807	2,142	116,846
U.S. Treasury Bonds	60	3,772	—	—	60	3,772
Equity securities:	11	1,267	—	—	11	1,267
	4,062	162,540	2,192	76,145	6,254	238,685