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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 |

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- 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 + Details
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