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Bank segment - Contractual maturities of securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities [Abstract]
Due in one year or less	$ 25,005
Due after one year through five years	105,425
Due after five years through ten years	77,526
Due after ten years	27,788
Total amortized cost	235,744
Mortgage-related securities-FNMA, FHLMC and GNMA	1,218,313
Amortized cost	1,454,057	$ 1,421,622
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract]
Mortgage-related securities-FNMA, FHLMC and GNMA	62,630
Amortized cost	62,630	44,515
Available-for-sale Securities, Debt Securities, Fair Value [Abstract]
Due in one year or less	24,860
Due after one year through five years	104,020
Due after five years through ten years	75,563
Due after ten years	27,253
Total fair value	231,696
Mortgage-related securities-FNMA, FHLMC and GNMA	1,177,832
Total available-for-sale securities	1,409,528	1,401,198
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract]
Mortgage-related securities-FNMA, FHLMC and GNMA	61,444
Total held-to-maturity securities	$ 61,444	$ 44,412

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