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Bank segment - Components of investment securities (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) issue | Dec. 31, 2014 USD ($) issue
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | $ 779,080 | $ 549,627
Gross unrealized gains | 9,319 | 6,745
Gross unrealized losses | (2,562) | (5,978)
Available-for-sale securities | $ 785,837 | $ 550,394
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 12 | 12
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 81,939 | $ 88,999
Gross unrealized losses, less than 12 months | $ (324) | $ (525)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 28 | 34
Fair value, 12 months or longer | $ 151,092 | $ 201,791
Gross unrealized losses, 12 months or longer | (2,238) | (5,453)
U.S. Treasury and federal agency obligations |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 209,025 | 119,507
Gross unrealized gains | 2,435 | 1,092
Gross unrealized losses | (342) | (1,039)
Available-for-sale securities | $ 211,118 | $ 119,560
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 4 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 24,676 | $ 41,970
Gross unrealized losses, less than 12 months | $ (46) | $ (361)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 3 | 5
Fair value, 12 months or longer | $ 18,218 | $ 29,168
Gross unrealized losses, 12 months or longer | (296) | (678)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 570,055 | 430,120
Gross unrealized gains | 6,884 | 5,653
Gross unrealized losses | (2,220) | (4,939)
Available-for-sale securities | $ 574,719 | $ 430,834
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 8 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 57,263 | $ 47,029
Gross unrealized losses, less than 12 months | $ (278) | $ (164)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 25 | 29
Fair value, 12 months or longer | $ 132,874 | $ 172,623
Gross unrealized losses, 12 months or longer | $ (1,942) | $ (4,775)

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