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Bank segment - Components of investment securities (Details) $ in Thousands | Jun. 30, 2017 USD ($) issue | Dec. 31, 2016 USD ($) issue
--- | --- | ---
Available-for-sale securities |  |
Amortized cost | $ 1,312,329 | $ 1,118,350
Gross unrealized gains | 3,149 | 2,662
Gross unrealized losses | (12,592) | (15,830)
Available-for-sale investment securities | $ 1,302,886 | $ 1,105,182
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Available-for-sale, securities, less than 12 months, number of issues (in issues) | issue | 114 | 106
Fair value, less than 12 months | $ 864,060 | $ 833,130
Gross unrealized losses, less than 12 months | $ (11,190) | $ (14,153)
Available-for-sale, securities, greater than 12 months, number of issues (in issues) | issue | 14 | 14
Fair value, 12 months or longer | $ 46,482 | $ 50,970
Gross unrealized losses, 12 months or longer | (1,402) | (1,677)
U.S. Treasury and federal agency obligations |  |
Available-for-sale securities |  |
Amortized cost | 187,289 | 193,515
Gross unrealized gains | 947 | 920
Gross unrealized losses | (1,653) | (2,154)
Available-for-sale investment securities | $ 186,583 | $ 192,281
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Available-for-sale, securities, less than 12 months, number of issues (in issues) | issue | 16 | 18
Fair value, less than 12 months | $ 104,417 | $ 123,475
Gross unrealized losses, less than 12 months | $ (1,532) | $ (2,010)
Available-for-sale, securities, greater than 12 months, number of issues (in issues) | issue | 1 | 1
Fair value, 12 months or longer | $ 3,186 | $ 3,485
Gross unrealized losses, 12 months or longer | (121) | (144)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Amortized cost | 1,109,613 | 909,408
Gross unrealized gains | 2,202 | 1,742
Gross unrealized losses | (10,939) | (13,676)
Available-for-sale investment securities | $ 1,100,876 | $ 897,474
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Available-for-sale, securities, less than 12 months, number of issues (in issues) | issue | 98 | 88
Fair value, less than 12 months | $ 759,643 | $ 709,655
Gross unrealized losses, less than 12 months | $ (9,658) | $ (12,143)
Available-for-sale, securities, greater than 12 months, number of issues (in issues) | issue | 13 | 13
Fair value, 12 months or longer | $ 43,296 | $ 47,485
Gross unrealized losses, 12 months or longer | (1,281) | (1,533)
Mortgage revenue bond |  |
Available-for-sale securities |  |
Amortized cost | 15,427 | 15,427
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Available-for-sale investment securities | $ 15,427 | $ 15,427
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Available-for-sale, securities, less than 12 months, number of issues (in issues) | issue | 0 | 0
Fair value, less than 12 months | $ 0 | $ 0
Gross unrealized losses, less than 12 months | $ 0 | $ 0
Available-for-sale, securities, greater than 12 months, number of issues (in issues) | issue | 0 | 0
Fair value, 12 months or longer | $ 0 | $ 0
Gross unrealized losses, 12 months or longer | $ 0 | $ 0

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