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Note Fair value measurement (Changes in level 3 assets and liabilities measured at fair value on a recurring basis) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 166,508	$ 195,766	$ 170,420	$ 204,959
Gains (Losses) included in earnings	(4,202)	(10,342)	(13,148)	(24,439)
Gains (losses) included in OCI	(1)	(1)	1	9
Additions	2,953	1,722	8,129	7,901
Sales		0		(521)
Settlements	(33)	(372)	(177)	(1,048)
Transfers out of Level 3	0	(4,164)	0	(4,252)
Ending Balance	165,225	182,609	165,225	182,609
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	3	(6,239)	20	(9,869)
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		(163,668)	(164,858)	(153,158)
Gains (Losses) included in earnings		(3,208)	(6,112)	(13,718)
Gains (losses) included in OCI		0	0	0
Additions		0	0	0
Sales		0		0
Settlements		0	170,970	0
Transfer into Level 3	0	0	0	0
Transfer out of Level 3	0	0	0	0
Ending Balance	0	(166,876)	0	(166,876)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss		(3,208)	0	(13,718)
Other liabilities | Contingent consideration
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		(163,668)	(164,858)	(153,158)
Gains (Losses) included in earnings		(3,208)	(6,112)	(13,718)
Gains (losses) included in OCI		0	0	0
Additions		0	0	0
Sales		0		0
Settlements		0	170,970	0
Transfer out of Level 3		0		0
Ending Balance	0	(166,876)	0	(166,876)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss		(3,208)	0	(13,718)
Available-for-sale debt securities | Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,264	1,289	1,288	1,392
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	(1)	(1)	1	9
Additions	0	0	0	0
Sales		0		0
Settlements	0	0	(26)	(25)
Transfers out of Level 3		0		(88)
Ending Balance	1,263	1,288	1,263	1,288
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	0	0	0
Trading account securities | Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	43	4,334	43	4,755
Gains (Losses) included in earnings	0	(77)	0	(124)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	332
Sales		0		(156)
Settlements	0	(326)	0	(876)
Transfers out of Level 3		(3,888)		(3,888)
Ending Balance	43	43	43	43
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	0	0	(23)
Trading account securities | Collateralized Mortgage Obligations
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	670	858	529	1,321
Gains (Losses) included in earnings	0	5	6	0
Gains (losses) included in OCI	0	0	0	0
Additions	7	31	260	39
Sales		0		(365)
Settlements	(33)	(46)	(151)	(147)
Transfers out of Level 3		(276)		(276)
Ending Balance	644	572	644	572
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	1	6	(5)
Trading account securities | Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	506	557	529	602
Gains (Losses) included in earnings	(8)	(8)	(31)	(53)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales		0		0
Settlements	0	0	0	0
Transfers out of Level 3		0		0
Ending Balance	498	549	498	549
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	3	1	14	22
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	164,025	188,728	168,031	196,889
Gains (Losses) included in earnings	(4,194)	(10,262)	(13,123)	(24,262)
Gains (losses) included in OCI	0	0	0	0
Additions	2,946	1,691	7,869	7,530
Sales		0		0
Settlements	0	0	0	0
Transfers out of Level 3		0		0
Ending Balance	162,777	180,157	162,777	180,157
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	$ 0	$ (6,241)	$ 0	$ (9,863)

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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