Bank segment (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Amortized Cost
Due in one year or less	$ 0
Due after one year through five years	44,492
Due after five years through ten years	32,303
Due after ten years	25,677
Total amortized cost	102,472
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	447,373
Total available-for-sale securities, Amortized cost	549,845	535,090
Fair value
Due in one year or less	0
Due after one year through five years	44,538
Due after five years through ten years	32,839
Due after ten years	24,652
Total fair value	102,029
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	447,292
Available-for-sale securities	$ 549,321	$ 529,007