Bank segment (Details 8) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Credit risk profile based on payment activity for loans
30-59 days past due	$ 7,164	$ 5,781
60-89 days past due	3,131	1,752
Greater than 90 days	21,869	26,227
Total past due	32,164	33,760
Current	4,262,881	4,125,193
Total financing receivables	4,295,045	4,158,953	3,963,389
Recorded Investment greater than 90 days and accruing	52	0
Residential 1-4 family
Credit risk profile based on payment activity for loans
30-59 days past due	5,161	2,728
60-89 days past due	2,233	622
Greater than 90 days	14,739	15,411
Total past due	22,133	18,761
Current	1,996,959	1,987,246
Total financing receivables	2,019,092	2,006,007	2,001,035
Commercial real estate
Credit risk profile based on payment activity for loans
30-59 days past due	0	0
Greater than 90 days	3,731	3,770
Total past due	3,731	3,770
Current	472,385	436,673
Total financing receivables	476,116	440,443	382,735
Home equity line of credit
Credit risk profile based on payment activity for loans
30-59 days past due	956	765
60-89 days past due	545	312
Greater than 90 days	364	960
Total past due	1,865	2,037
Current	788,972	737,294
Total financing receivables	790,837	739,331	673,727
Residential land
Credit risk profile based on payment activity for loans
30-59 days past due	230	184
60-89 days past due	0	48
Greater than 90 days	145	2,756
Total past due	375	2,988
Current	16,814	13,188
Total financing receivables	17,189	16,176	21,836
Recorded Investment greater than 90 days and accruing	52
Commercial construction
Credit risk profile based on payment activity for loans
Current	80,312	52,112
Total financing receivables	80,312	52,112	50,114
Residential construction
Credit risk profile based on payment activity for loans
Current	17,441	12,774
Total financing receivables	17,441	12,774	9,664
Commercial loans
Credit risk profile based on payment activity for loans
30-59 days past due	266	1,668
60-89 days past due	52	612
Greater than 90 days	2,717	3,026
Total past due	3,035	5,306
Current	779,769	778,082
Total financing receivables	782,804	783,388	719,519
Recorded Investment greater than 90 days and accruing		0
Consumer loans
Credit risk profile based on payment activity for loans
30-59 days past due	551	436
60-89 days past due	301	158
Greater than 90 days	173	304
Total past due	1,025	898
Current	110,229	107,824
Total financing receivables	111,254	108,722	104,759
Recorded Investment greater than 90 days and accruing		$ 0