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Note Allowance for loan losses (Troubled debt restructuring according to their accruing status) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 130,537		$ 115,191
Commercial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	52,250		40,863
Construction
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,530		0
Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	46,205		51,421
Leasing
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	297		450
Consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	26,255		$ 22,457
Non Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	1,431,012	$ 1,258,327
Non Covered Loans | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	124,080	104,581
Non Covered Loans | Commercial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	319,446	220,846
Non Covered Loans | Commercial | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	46,694	32,472
Non Covered Loans | Construction
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	1,829	0
Non Covered Loans | Construction | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,530	0
Non Covered Loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	997,362	930,076
Non Covered Loans | Mortgages | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	46,205	48,832
Non Covered Loans | Leasing
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	992	1,256
Non Covered Loans | Leasing | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	297	475
Non Covered Loans | Consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	111,383	106,149
Non Covered Loans | Consumer | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	25,354	22,802
Covered loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	5,885
Covered loans | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Covered loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	5,885
Covered loans | Mortgages | TDR
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Non-Accruing | Non Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	270,111	199,050
Non-Accruing | Non Covered Loans | Commercial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	119,250	59,626
Non-Accruing | Non Covered Loans | Construction
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	1,829	0
Non-Accruing | Non Covered Loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	133,708	126,798
Non-Accruing | Non Covered Loans | Leasing
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	220	393
Non-Accruing | Non Covered Loans | Consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	15,104	12,233
Non-Accruing | Covered loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	3,227
Non-Accruing | Covered loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	3,227
Accruing | Non Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	1,160,901	1,059,277
Accruing | Non Covered Loans | Commercial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	200,196	161,220
Accruing | Non Covered Loans | Construction
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	0
Accruing | Non Covered Loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	863,654	803,278
Accruing | Non Covered Loans | Leasing
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	772	863
Accruing | Non Covered Loans | Consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	96,279	93,916
Accruing | Covered loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	0	2,658
Accruing | Covered loans | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Troubled debt restructurings	$ 0	$ 2,658

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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+ References

No definition available.

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