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	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 200,976	$ 214,316	$ 204,959	$ 221,811
Gains (Losses) included in earnings	(8,077)	(4,342)	(14,097)	(12,762)
Gains (losses) included in OCI	0	1	10	16
Additions	3,252	3,511	6,179	6,146
Sales	(160)	(798)	(521)	(2,024)
Settlements	(225)	(310)	(676)	(809)
Adjustments				0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	(88)	0
Ending Balance	195,766	212,378	195,766	212,378
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	(2,885)	654	(3,630)	(3,117)
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(160,543)	(120,823)	(153,158)	(120,380)
Gains (Losses) included in earnings	(3,125)	(7,688)	(10,510)	(8,131)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Adjustments				0
Transfer into Level 3	0	0	0	0
Transfer out of Level 3	0	0	0	0
Ending Balance	(163,668)	(128,511)	(163,668)	(128,511)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	(3,125)	(7,688)	(10,510)	(8,131)
Other liabilities \| Contingent consideration
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(160,543)	(120,823)	(153,158)	(120,380)
Gains (Losses) included in earnings	(3,125)	(7,688)	(10,510)	(8,131)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Adjustments				0
Transfer out of Level 3			0
Ending Balance	(163,668)	(128,511)	(163,668)	(128,511)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	(3,125)	(7,688)	(10,510)	(8,131)
Available For Sale Securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,289	1,422	1,392	1,434
Gains (Losses) included in earnings	0	0	0	(2)
Gains (losses) included in OCI	0	1	10	16
Additions	0	0	0	0
Sales	0	0	0	0
Settlements	0	(25)	(25)	(50)
Adjustments				0
Ending Balance	1,289	1,398	1,289	1,398
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	0	0	0
Available For Sale Securities \| Collateralized Mortgage Obligations
Assets, Fair Value Disclosure [Abstract]
Transfers out of Level 3			(88)
Trading account securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	4,345	5,397	4,755	6,454
Gains (Losses) included in earnings	(4)	28	(47)	117
Gains (losses) included in OCI	0	0	0	0
Additions	168	610	332	948
Sales	0	(596)	(156)	(1,716)
Settlements	(175)	(75)	(550)	(439)
Adjustments				0
Transfers out of Level 3			0
Ending Balance	4,334	5,364	4,334	5,364
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	4	15	(23)	101
Trading account securities \| Collateralized Mortgage Obligations
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,061	1,783	1,321	1,831
Gains (Losses) included in earnings	(1)	(7)	(5)	(13)
Gains (losses) included in OCI	0	0	0	0
Additions	8	35	8	209
Sales	(160)	(202)	(365)	(308)
Settlements	(50)	(210)	(101)	(320)
Adjustments				0
Transfers out of Level 3	0		0
Ending Balance	858	1,399	858	1,399
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	(2)	(3)	(6)	(6)
Trading account securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	583	663	602	687
Gains (Losses) included in earnings	(26)	(23)	(45)	(47)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Adjustments				0
Transfers out of Level 3			0
Ending Balance	557	640	557	640
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	12	10	21	21
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	193,698	205,051	196,889	211,405
Gains (Losses) included in earnings	(8,046)	(4,340)	(14,000)	(12,817)
Gains (losses) included in OCI	0	0	0	0
Additions	3,076	2,866	5,839	4,989
Sales	0	0	0	0
Settlements	0	0	0	0
Adjustments				0
Transfers out of Level 3			0
Ending Balance	188,728	203,577	188,728	203,577
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	$ (2,899)	$ 632	$ (3,622)	$ (3,233)

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