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Bank segment - Components of investment securities (Details) $ in Thousands | Mar. 31, 2018 USD ($) issue | Dec. 31, 2017 USD ($) issue
--- | --- | ---
Available-for-sale |  |
Amortized cost | $ 1,457,078 | $ 1,421,622
Gross unrealized gains | 553 | 1,231
Gross unrealized losses | (39,141) | (21,655)
Estimated fair value | $ 1,418,490 | $ 1,401,198
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months: Number of issues | issue | 104 | 82
Less than 12 months: Fair value | $ 855,970 | $ 736,772
Less than 12 months: Amount | $ (18,585) | $ (7,664)
12 months or longer: Number of Issues | issue | 88 | 85
12 months or longer: Fair value | $ 516,365 | $ 522,208
12 months or longer: Amount | (20,556) | (13,991)
Held-to-maturity Securities, Classified [Abstract] |  |
Amortized cost | 43,450 | 44,515
Gross unrealized gains | 0 | 1
Gross unrealized losses | (959) | (104)
Held-to-maturity investment securities | $ 42,491 | $ 44,412
Held-to-maturity Securities, Continuous Unrealized Loss Position |  |
Less Than 12 Months: Number Of Issues | issue | 3 | 2
Less than 12 Months: Fair value | $ 42,491 | $ 35,744
Less than 12 Months: Amount | $ (959) | $ (104)
12 months or longer: Number of issues | issue | 0 | 0
12 months or longer: Fair value | $ 0 | $ 0
12 months or longer: Amount | 0 | 0
U.S. Treasury and federal agency obligations |  |
Available-for-sale |  |
Amortized cost | 181,919 | 185,891
Gross unrealized gains | 164 | 438
Gross unrealized losses | (3,255) | (2,031)
Estimated fair value | $ 178,828 | $ 184,298
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months: Number of issues | issue | 18 | 15
Less than 12 months: Fair value | $ 93,034 | $ 83,137
Less than 12 months: Amount | $ (1,424) | $ (825)
12 months or longer: Number of Issues | issue | 9 | 8
12 months or longer: Fair value | $ 68,489 | $ 62,296
12 months or longer: Amount | (1,831) | (1,206)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Available-for-sale |  |
Amortized cost | 1,259,732 | 1,220,304
Gross unrealized gains | 389 | 793
Gross unrealized losses | (35,886) | (19,624)
Estimated fair value | $ 1,224,235 | $ 1,201,473
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months: Number of issues | issue | 86 | 67
Less than 12 months: Fair value | $ 762,936 | $ 653,635
Less than 12 months: Amount | $ (17,161) | $ (6,839)
12 months or longer: Number of Issues | issue | 79 | 77
12 months or longer: Fair value | $ 447,876 | $ 459,912
12 months or longer: Amount | (18,725) | (12,785)
Held-to-maturity Securities, Classified [Abstract] |  |
Amortized cost | 43,450 | 44,515
Gross unrealized gains | 0 | 1
Gross unrealized losses | (959) | (104)
Held-to-maturity investment securities | $ 42,491 | $ 44,412
Held-to-maturity Securities, Continuous Unrealized Loss Position |  |
Less Than 12 Months: Number Of Issues | issue | 3 | 2
Less than 12 Months: Fair value | $ 42,491 | $ 35,744
Less than 12 Months: Amount | $ (959) | $ (104)
12 months or longer: Number of issues | issue | 0 | 0
12 months or longer: Fair value | $ 0 | $ 0
12 months or longer: Amount | 0 | 0
Mortgage revenue bond |  |
Available-for-sale |  |
Amortized cost | 15,427 | 15,427
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 15,427 | $ 15,427
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months: Number of issues | issue | 0 | 0
Less than 12 months: Fair value | $ 0 | $ 0
Less than 12 months: Amount | $ 0 | $ 0
12 months or longer: Number of Issues | issue | 0 | 0
12 months or longer: Fair value | $ 0 | $ 0
12 months or longer: Amount | $ 0 | $ 0

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