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Bank segment - Components of investment securities (Details) $ in Thousands	Jun. 30, 2018 USD ($) issue	Dec. 31, 2017 USD ($) issue
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 1,454,057	$ 1,421,622
Gross unrealized gains	445	1,231
Gross unrealized losses	(44,974)	(21,655)
Estimated fair value	$ 1,409,528	$ 1,401,198
Gross unrealized losses, Less than 12 months, Number of issues | issue	104	82
Gross unrealized losses, Less than 12 months, Fair value	$ 817,048	$ 736,772
Gross unrealized losses, Less than 12 months, Amount	$ (21,381)	$ (7,664)
Gross unrealized losses, 12 months or longer, Number of issues | issue	92	85
Gross unrealized losses, 12 months or longer, Fair value	$ 523,501	$ 522,208
Gross unrealized losses, 12 months or longer, Amount	(23,593)	(13,991)
Debt Securities, Held-to-maturity [Abstract]
Amortized cost	62,630	44,515
Gross unrealized gains	41	1
Gross unrealized losses	(1,227)	(104)
Held-to-maturity investment securities	$ 61,444	$ 44,412
Less Than 12 Months: Number Of Issues | issue	3	2
Less than 12 Months: Fair value	$ 41,138	$ 35,744
Less than 12 Months: Amount	$ (1,227)	$ (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
Debt Securities, Available-for-sale [Abstract]
Amortized cost	179,986	185,891
Gross unrealized gains	72	438
Gross unrealized losses	(4,125)	(2,031)
Estimated fair value	$ 175,933	$ 184,298
Gross unrealized losses, Less than 12 months, Number of issues | issue	19	15
Gross unrealized losses, Less than 12 months, Fair value	$ 98,578	$ 83,137
Gross unrealized losses, Less than 12 months, Amount	$ (2,018)	$ (825)
Gross unrealized losses, 12 months or longer, Number of issues | issue	9	8
Gross unrealized losses, 12 months or longer, Fair value	$ 67,283	$ 62,296
Gross unrealized losses, 12 months or longer, Amount	(2,107)	(1,206)
Mortgage-related securities- FNMA, FHLMC and GNMA
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,218,313	1,220,304
Gross unrealized gains	350	793
Gross unrealized losses	(40,831)	(19,624)
Estimated fair value	$ 1,177,832	$ 1,201,473
Gross unrealized losses, Less than 12 months, Number of issues | issue	81	67
Gross unrealized losses, Less than 12 months, Fair value	$ 694,629	$ 653,635
Gross unrealized losses, Less than 12 months, Amount	$ (19,345)	$ (6,839)
Gross unrealized losses, 12 months or longer, Number of issues | issue	83	77
Gross unrealized losses, 12 months or longer, Fair value	$ 456,218	$ 459,912
Gross unrealized losses, 12 months or longer, Amount	(21,486)	(12,785)
Debt Securities, Held-to-maturity [Abstract]
Amortized cost	62,630	44,515
Gross unrealized gains	41	1
Gross unrealized losses	(1,227)	(104)
Held-to-maturity investment securities	$ 61,444	$ 44,412
Less Than 12 Months: Number Of Issues | issue	3	2
Less than 12 Months: Fair value	$ 41,138	$ 35,744
Less than 12 Months: Amount	$ (1,227)	$ (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
Corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized cost	40,331
Gross unrealized gains	23
Gross unrealized losses	(18)
Estimated fair value	$ 40,336
Gross unrealized losses, Less than 12 months, Number of issues | issue	4
Gross unrealized losses, Less than 12 months, Fair value	$ 23,841
Gross unrealized losses, Less than 12 months, Amount	$ (18)
Gross unrealized losses, 12 months or longer, Number of issues | issue	0
Gross unrealized losses, 12 months or longer, Fair value	$ 0
Gross unrealized losses, 12 months or longer, Amount	0
Mortgage revenue bond
Debt Securities, Available-for-sale [Abstract]
Amortized cost	15,427	15,427
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 15,427	$ 15,427
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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