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Bank segment - Components of investment securities (Details) $ in Thousands | Mar. 31, 2019 USD ($) issue | Dec. 31, 2018 USD ($) issue
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,368,733 | $ 1,421,897
Gross unrealized gains | 2,456 | 954
Gross unrealized losses | (22,926) | (34,318)
Estimated fair value | $ 1,348,263 | $ 1,388,533
Gross unrealized losses, Less than 12 months, Number of issues | issue | 5 | 33
Gross unrealized losses, Less than 12 months, Fair value | $ 23,814 | $ 178,068
Gross unrealized losses, Less than 12 months, Amount | $ (17) | $ (1,907)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 181 | 164
Gross unrealized losses, 12 months or longer, Fair value | $ 1,127,667 | $ 1,066,295
Gross unrealized losses, 12 months or longer, Amount | (22,909) | (32,411)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 140,203 | 141,875
Gross unrealized gains | 2,528 | 1,446
Gross unrealized losses | (398) | (1,264)
Held-to-maturity investment securities | $ 142,333 | $ 142,057
Less Than 12 Months: Number Of Issues | issue | 0 | 3
Less than 12 Months: Fair value | $ 0 | $ 29,814
Less than 12 Months: Amount | $ 0 | $ (400)
12 months or longer: Number of issues | issue | 3 | 2
12 months or longer: Fair value | $ 39,027 | $ 31,505
12 months or longer: Amount | (398) | (864)
U.S. Treasury and federal agency obligations |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 142,179 | 156,694
Gross unrealized gains | 93 | 62
Gross unrealized losses | (1,428) | (2,407)
Estimated fair value | $ 140,844 | $ 154,349
Gross unrealized losses, Less than 12 months, Number of issues | issue | 2 | 5
Gross unrealized losses, Less than 12 months, Fair value | $ 10,022 | $ 25,882
Gross unrealized losses, Less than 12 months, Amount | $ (7) | $ (208)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 20 | 19
Gross unrealized losses, 12 months or longer, Fair value | $ 117,499 | $ 118,405
Gross unrealized losses, 12 months or longer, Amount | (1,421) | (2,199)
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 1,149,167 | 1,192,169
Gross unrealized gains | 1,318 | 789
Gross unrealized losses | (21,498) | (31,542)
Estimated fair value | $ 1,128,987 | $ 1,161,416
Gross unrealized losses, Less than 12 months, Number of issues | issue | 3 | 22
Gross unrealized losses, Less than 12 months, Fair value | $ 13,792 | $ 129,011
Gross unrealized losses, Less than 12 months, Amount | $ (10) | $ (1,330)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 161 | 145
Gross unrealized losses, 12 months or longer, Fair value | $ 1,010,168 | $ 947,890
Gross unrealized losses, 12 months or longer, Amount | (21,488) | (30,212)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 140,203 | 141,875
Gross unrealized gains | 2,528 | 1,446
Gross unrealized losses | (398) | (1,264)
Held-to-maturity investment securities | $ 142,333 | $ 142,057
Less Than 12 Months: Number Of Issues | issue | 0 | 3
Less than 12 Months: Fair value | $ 0 | $ 29,814
Less than 12 Months: Amount | $ 0 | $ (400)
12 months or longer: Number of issues | issue | 3 | 2
12 months or longer: Fair value | $ 39,027 | $ 31,505
12 months or longer: Amount | (398) | (864)
Corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 49,417 | 49,398
Gross unrealized gains | 1,045 | 103
Gross unrealized losses | 0 | (369)
Estimated fair value | $ 50,462 | $ 49,132
Gross unrealized losses, Less than 12 months, Number of issues | issue | 0 | 6
Gross unrealized losses, Less than 12 months, Fair value | $ 0 | $ 23,175
Gross unrealized losses, Less than 12 months, Amount | $ 0 | $ (369)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 0 | 0
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 0
Gross unrealized losses, 12 months or longer, Amount | 0 | 0
Mortgage revenue bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 27,970 | 23,636
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 27,970 | $ 23,636
Gross unrealized losses, Less than 12 months, Number of issues | issue | 0 | 0
Gross unrealized losses, Less than 12 months, Fair value | $ 0 | $ 0
Gross unrealized losses, Less than 12 months, Amount | $ 0 | $ 0
Gross unrealized losses, 12 months or longer, Number of issues | issue | 0 | 0
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 0
Gross unrealized losses, 12 months or longer, Amount | $ 0 | $ 0

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