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Bank segment - Components of investment securities (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) issue | Dec. 31, 2014 USD ($) issue
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | $ 693,157 | $ 549,627
Gross unrealized gains | 6,572 | 6,745
Gross unrealized losses | (6,209) | (5,978)
Available-for-sale securities | $ 693,520 | $ 550,394
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 32 | 12
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 247,800 | $ 88,999
Gross unrealized losses, less than 12 months | $ (2,099) | $ (525)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 28 | 34
Fair value, 12 months or longer | $ 154,878 | $ 201,791
Gross unrealized losses, 12 months or longer | (4,110) | (5,453)
U.S. Treasury and federal agency obligations |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 168,143 | 119,507
Gross unrealized gains | 1,355 | 1,092
Gross unrealized losses | (1,039) | (1,039)
Available-for-sale securities | $ 168,459 | $ 119,560
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 12 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 76,835 | $ 41,970
Gross unrealized losses, less than 12 months | $ (477) | $ (361)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 3 | 5
Fair value, 12 months or longer | $ 18,332 | $ 29,168
Gross unrealized losses, 12 months or longer | (562) | (678)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 525,014 | 430,120
Gross unrealized gains | 5,217 | 5,653
Gross unrealized losses | (5,170) | (4,939)
Available-for-sale securities | $ 525,061 | $ 430,834
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 20 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 170,965 | $ 47,029
Gross unrealized losses, less than 12 months | $ (1,622) | $ (164)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 25 | 29
Fair value, 12 months or longer | $ 136,546 | $ 172,623
Gross unrealized losses, 12 months or longer | $ (3,548) | $ (4,775)

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