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Bank segment - Components of investment securities (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) issue	Dec. 31, 2015 USD ($) issue
Available-for-sale securities
Total available-for-sale securities, Amortized cost	$ 897,070	$ 823,756
Gross unrealized gains	10,930	4,589
Gross unrealized losses	(1,705)	(7,697)
Available-for-sale securities	$ 906,295	$ 820,648
Available-for-sale, securities, less than 12 months, number of issues | issue	9	51
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	$ 67,217	$ 388,838
Gross unrealized losses, less than 12 months	$ (256)	$ (3,732)
Available-for-sale, securities, greater than 12 months, number of issues | issue	23	28
Fair value, 12 months or longer	$ 110,502	$ 143,195
Gross unrealized losses, 12 months or longer	(1,449)	(3,965)
U.S. Treasury and federal agency obligations
Available-for-sale securities
Total available-for-sale securities, Amortized cost	215,716	213,234
Gross unrealized gains	3,078	1,025
Gross unrealized losses	(97)	(1,300)
Available-for-sale securities	$ 218,697	$ 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	2	3
Fair value, 12 months or longer	$ 9,511	$ 17,378
Gross unrealized losses, 12 months or longer	(97)	(434)
Mortgage-related securities- FNMA, FHLMC and GNMA
Available-for-sale securities
Total available-for-sale securities, Amortized cost	681,354	610,522
Gross unrealized gains	7,852	3,564
Gross unrealized losses	(1,608)	(6,397)
Available-for-sale securities	$ 687,598	$ 607,689
Available-for-sale, securities, less than 12 months, number of issues | issue	9	38
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair value, less than 12 months	$ 67,217	$ 305,785
Gross unrealized losses, less than 12 months	$ (256)	$ (2,866)
Available-for-sale, securities, greater than 12 months, number of issues | issue	21	25
Fair value, 12 months or longer	$ 100,991	$ 125,817
Gross unrealized losses, 12 months or longer	$ (1,352)	$ (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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-Publisher FASB
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