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Bank segment - Contractual maturities of securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Due in one year or less | $ 12,062 |
Due after one year through five years | 126,045 |
Due after five years through ten years | 54,880 |
Due after ten years | 15,427 |
Total amortized cost | 208,414 |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 1,090,729 |
Amortized cost | 1,299,143 | $ 1,421,897
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 137,029 |
Amortized cost | 137,029 | 141,875
Available-for-sale Securities, Debt Securities, Fair Value [Abstract] |  |
Due in one year or less | 12,076 |
Due after one year through five years | 127,461 |
Due after five years through ten years | 55,559 |
Due after ten years | 15,427 |
Total fair value | 210,523 |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 1,087,487 |
Total available-for-sale securities | 1,298,010 | 1,388,533
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 141,231 |
Total held-to-maturity securities | $ 141,231 | $ 142,057

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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