XML 53 R43.htm IDEA: XBRL DOCUMENT
v3.19.1

Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | $ 19,720,294 | $ 19,805,403 |  |
Non-Graded, Recorded Investment | 2,038,686 | 1,851,327 |  |
Total | 21,758,980 | 21,656,730 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 170,583 | 171,272 |  |
Non-Graded, Allowance | 15,579 | 18,417 |  |
Total | 205,340 | 207,457 | $ 223,967 | $ 230,682
Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 13,931,425 | 13,586,654 |  |
Non-Graded, Recorded Investment | 30,550 | 49,424 |  |
Total | 13,961,975 | 13,636,078 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 102,646 | 101,303 |  |
Non-Graded, Allowance | 931 | 923 |  |
Total | 103,577 | 102,226 | 120,083 | 124,269
Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,705,099 | 3,590,333 |  |
Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,287,563 | 3,258,192 |  |
Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 1,706,900 | 1,621,158 |  |
Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 742,374 | 730,521 |  |
Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 2,915,885 | 2,799,277 |  |
Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 803,083 | 804,550 |  |
Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 801,071 | 832,047 |  |
Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 4,600,651 | 4,764,813 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Total | 4,600,651 | 4,764,813 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 58,134 | 60,026 |  |
Non-Graded, Allowance | 0 | 0 |  |
Total | 58,134 | 60,026 | 57,070 | 56,621
Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 149,686 | 148,584 |  |
Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 890,685 | 919,082 |  |
Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 1,033,158 | 1,072,920 |  |
Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 1,210,358 | 1,288,065 |  |
Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 767,757 | 778,106 |  |
Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 549,007 | 558,056 |  |
Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 275,875 | 505,046 |  |
Non-Graded, Recorded Investment | 1,916,745 | 1,724,987 |  |
Total | 2,192,620 | 2,230,033 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 3,176 | 3,310 |  |
Non-Graded, Allowance | 12,492 | 14,654 |  |
Total | 15,668 | 17,964 | 18,431 | 18,451
Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 1,098,481 | 1,122,610 |  |
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 193,308 | 190,866 |  |
Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 900,831 | 916,557 |  |
Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 912,343 | 948,890 |  |
Non-Graded, Recorded Investment | 91,391 | 76,916 |  |
Total | 1,003,734 | 1,025,806 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 6,627 | 6,633 |  |
Non-Graded, Allowance | 2,156 | 2,840 |  |
Total | 8,783 | 9,473 | 8,408 | 9,124
Specific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 19,720,294 | 19,805,403 |  |
Non-Graded, Recorded Investment | 2,038,686 | 1,851,327 |  |
Total | 21,758,980 | 21,656,730 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 170,583 | 171,272 |  |
Non-Graded, Allowance | 15,579 | 18,417 |  |
Total | 186,162 | 189,689 |  |
Nonspecific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Total | 0 | 0 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance | 0 | 0 |  |
Non-Graded, Allowance | 0 | 0 |  |
Total | 19,178 | 17,768 | $ 19,975 | $ 22,217
Performing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 1,998,899 | 1,811,557 |  |
Performing [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 30,489 | 49,371 |  |
Performing [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 30,489 | 49,371 |  |
Performing [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 1,877,245 | 1,685,424 |  |
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 800,578 | 819,199 |  |
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 186,362 | 183,734 |  |
Performing [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 890,305 | 682,491 |  |
Performing [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment | 91,165 | 76,762 |  |
Performing [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 19,242,855 | 19,285,126 |  |
Performing [Member] | Pass [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 13,508,082 | 13,135,068 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 3,549,167 | 3,414,039 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 3,189,490 | 3,167,203 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,675,248 | 1,593,902 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 677,497 | 668,438 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 2,869,515 | 2,730,121 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 803,083 | 804,550 |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 744,082 | 756,815 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 4,549,845 | 4,712,826 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 149,336 | 148,234 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 857,698 | 885,588 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,024,892 | 1,059,334 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,203,220 | 1,287,471 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 767,757 | 776,898 |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 546,942 | 555,301 |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 272,741 | 492,976 |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 272,741 | 269,678 |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 223,298 |  |
Performing [Member] | Pass [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 912,187 | 944,256 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 195,739 | 181,960 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 171,717 | 157,866 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 39,285 | 42,176 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 60,361 | 49,761 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 21,100 | 18,809 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 34,033 | 30,934 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 13,748 | 14,920 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 3,190 | 1,266 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 23,975 | 23,927 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 11,549 | 11,926 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 4,219 | 10,532 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 7,136 | 281 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,071 | 1,188 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 52 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 52 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 47 | 115 |  |
Performing [Member] | Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 168,910 | 214,840 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 161,329 | 193,932 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 81,315 | 86,624 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 28,157 | 32,661 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 9,127 | 7,131 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 21,296 | 22,230 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 13,854 | 37,698 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 7,580 | 7,588 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 5,323 | 6,439 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,279 | 1,289 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 3,192 | 3,054 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 2 | 12 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 1,208 |  |
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 850 | 876 |  |
Performing [Member] | Substandard [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 2,225 | 10,026 |  |
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 2,225 | 9,730 |  |
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 296 |  |
Performing [Member] | Substandard [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 33 | 4,443 |  |
Nonaccrual [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 112,790 | 123,476 |  |
Non-Graded, Recorded Investment | 39,787 | 39,771 |  |
Nonaccrual [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 90,297 | 99,788 |  |
Non-Graded, Recorded Investment | 61 | 53 |  |
Nonaccrual [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 35,332 | 47,494 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 9,555 | 8,567 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 1,425 | 1,316 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 9,548 | 8,919 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 18,768 | 16,538 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 15,669 | 16,954 |  |
Non-Graded, Recorded Investment | 61 | 53 |  |
Nonaccrual [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 21,508 | 21,621 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 350 | 350 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 20,159 | 20,279 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 855 | 0 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 301 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 144 | 691 |  |
Non-Graded, Recorded Investment | 0 | 0 |  |
Nonaccrual [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 909 | 1,991 |  |
Non-Graded, Recorded Investment | 39,500 | 39,564 |  |
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 909 | 1,991 |  |
Non-Graded, Recorded Investment | 22,028 | 21,960 |  |
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Non-Graded, Recorded Investment | 6,946 | 7,132 |  |
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 0 | 0 |  |
Non-Graded, Recorded Investment | 10,526 | 10,472 |  |
Nonaccrual [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment | 76 | 76 |  |
Non-Graded, Recorded Investment | $ 226 | $ 154 |  |

X
- Definition The amount of the allowance for credit losses on recorded investment, that is internally risk graded, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. + References No definition available. + Details
Name: | bokf_InternallyRiskGradedAllowance
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the recorded investment, that is internally risk graded on credit quality, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. + References No definition available. + Details
Name: | bokf_InternallyRiskGradedRecordedInvestment
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the allowance for credit losses on recorded investment that is not internally risk graded, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. + References No definition available. + Details
Name: | bokf_NonGradedAllowance
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the recorded investment, for which risk grading is not used to monitor credit quality, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. These represent small homogeneous pools primarily composed of residential and consumers as well as certain commercial loans. + References No definition available. + Details
Name: | bokf_NonGradedRecordedInvestment
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | bokf_RecordedInvestmentAbstract
Namespace Prefix: | bokf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | bokf_RelatedAllowanceAbstract
Namespace Prefix: | bokf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_EnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_ServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_WholesaleAndRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_ManufacturingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HealthCareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_PublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_OtherCommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_ResidentialconstructionandlanddevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_OfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_OtherCommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_PermanentResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=bokf_SpecificAllowanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |