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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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