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Bank segment - Components of investment securities (Details) $ in Thousands	Jun. 30, 2016 USD ($) issue	Dec. 31, 2015 USD ($) issue
Available-for-sale securities
Total available-for-sale securities, Amortized cost	$ 880,554	$ 823,756
Gross unrealized gains	14,153	4,589
Gross unrealized losses	(686)	(7,697)
Available-for-sale investment securities	$ 894,021	$ 820,648
Available-for-sale, securities, less than 12 months, number of issues | issue	3	51
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	$ 20,608	$ 388,838
Gross unrealized losses, less than 12 months	$ (65)	$ (3,732)
Available-for-sale, securities, greater than 12 months, number of issues | issue	15	28
Fair value, 12 months or longer	$ 67,308	$ 143,195
Gross unrealized losses, 12 months or longer	(621)	(3,965)
U.S. Treasury and federal agency obligations
Available-for-sale securities
Total available-for-sale securities, Amortized cost	194,048	213,234
Gross unrealized gains	4,131	1,025
Gross unrealized losses	(20)	(1,300)
Available-for-sale investment securities	$ 198,159	$ 212,959
Available-for-sale, securities, less than 12 months, number of issues | issue	0	13
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	$ 0	$ 83,053
Gross unrealized losses, less than 12 months	$ 0	$ (866)
Available-for-sale, securities, greater than 12 months, number of issues | issue	1	3
Fair value, 12 months or longer	$ 3,842	$ 17,378
Gross unrealized losses, 12 months or longer	(20)	(434)
Mortgage-related securities- FNMA, FHLMC and GNMA
Available-for-sale securities
Total available-for-sale securities, Amortized cost	686,506	610,522
Gross unrealized gains	10,022	3,564
Gross unrealized losses	(666)	(6,397)
Available-for-sale investment securities	$ 695,862	$ 607,689
Available-for-sale, securities, less than 12 months, number of issues | issue	3	38
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	$ 20,608	$ 305,785
Gross unrealized losses, less than 12 months	$ (65)	$ (2,866)
Available-for-sale, securities, greater than 12 months, number of issues | issue	14	25
Fair value, 12 months or longer	$ 63,466	$ 125,817
Gross unrealized losses, 12 months or longer	$ (601)	$ (3,531)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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