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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | $ 20,338,154 |  | $ 19,805,403 |  |  |
Non-Graded, Recorded Investment | 1,947,213 |  | 1,851,327 |  |  |
Total | 22,285,367 |  | 21,656,730 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 171,275 |  | 171,272 |  |  |
Non-Graded, Allowance | 15,402 |  | 18,417 |  |  |
Total | 204,432 | $ 202,534 | 207,457 | $ 210,569 | $ 215,142 | $ 230,682
Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 14,396,278 |  | 13,586,654 |  |  |
Non-Graded, Recorded Investment | 28,347 |  | 49,424 |  |  |
Total | 14,424,625 |  | 13,636,078 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 105,714 |  | 101,303 |  |  |
Non-Graded, Allowance | 929 |  | 923 |  |  |
Total | 106,643 | 106,397 | 102,226 | 104,098 | 113,722 | 124,269
Commercial [Member] | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 4,114,269 |  | 3,590,333 |  |  |
Commercial [Member] | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 3,266,249 |  | 3,258,192 |  |  |
Commercial [Member] | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,848,617 |  | 1,621,158 |  |  |
Commercial [Member] | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 698,408 |  | 730,521 |  |  |
Commercial [Member] | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 3,032,968 |  | 2,799,277 |  |  |
Commercial [Member] | Public finance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 744,840 |  | 804,550 |  |  |
Commercial [Member] | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 719,274 |  | 832,047 |  |  |
Commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 4,626,057 |  | 4,764,813 |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Total | 4,626,057 |  | 4,764,813 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 54,350 |  | 60,026 |  |  |
Non-Graded, Allowance | 0 |  | 0 |  |  |
Total | 54,350 | 54,188 | 60,026 | 60,189 | 58,758 | 56,621
Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 135,361 |  | 148,584 |  |  |
Commercial real estate [Member] | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 799,169 |  | 919,082 |  |  |
Commercial real estate [Member] | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,014,275 |  | 1,072,920 |  |  |
Commercial real estate [Member] | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,324,839 |  | 1,288,065 |  |  |
Commercial real estate [Member] | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 873,536 |  | 778,106 |  |  |
Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 478,877 |  | 558,056 |  |  |
Residential mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 283,297 |  | 505,046 |  |  |
Non-Graded, Recorded Investment | 1,834,006 |  | 1,724,987 |  |  |
Total | 2,117,303 |  | 2,230,033 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 3,375 |  | 3,310 |  |  |
Non-Graded, Allowance | 12,159 |  | 14,654 |  |  |
Total | 15,534 | 15,724 | 17,964 | 18,683 | 18,544 | 18,451
Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,066,460 |  | 1,122,610 |  |  |
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 191,764 |  | 190,866 |  |  |
Residential mortgage [Member] | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 859,079 |  | 916,557 |  |  |
Personal [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,032,522 |  | 948,890 |  |  |
Non-Graded, Recorded Investment | 84,860 |  | 76,916 |  |  |
Total | 1,117,382 |  | 1,025,806 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 7,836 |  | 6,633 |  |  |
Non-Graded, Allowance | 2,314 |  | 2,840 |  |  |
Total | 10,150 | 9,388 | 9,473 | 8,709 | 8,646 | 9,124
Specific Allowance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 20,338,154 |  | 19,805,403 |  |  |
Non-Graded, Recorded Investment | 1,947,213 |  | 1,851,327 |  |  |
Total | 22,285,367 |  | 21,656,730 |  |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 171,275 |  | 171,272 |  |  |
Non-Graded, Allowance | 15,402 |  | 18,417 |  |  |
Total | 186,677 |  | 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 | 17,755 | $ 16,837 | 17,768 | $ 18,890 | $ 15,472 | $ 22,217
Performing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 1,910,190 |  | 1,811,557 |  |  |
Performing [Member] | Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 28,300 |  | 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 | 28,300 |  | 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 | 1,797,239 |  | 1,685,424 |  |  |
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 763,535 |  | 819,199 |  |  |
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 185,432 |  | 183,734 |  |  |
Performing [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 848,272 |  | 682,491 |  |  |
Performing [Member] | Personal [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 84,651 |  | 76,762 |  |  |
Performing [Member] | Pass [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 19,880,462 |  | 19,285,126 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 13,996,035 |  | 13,135,068 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 3,927,285 |  | 3,414,039 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 3,185,367 |  | 3,167,203 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,829,614 |  | 1,593,902 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 652,804 |  | 668,438 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,984,306 |  | 2,730,121 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Public finance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 744,840 |  | 804,550 |  |  |
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 671,819 |  | 756,815 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 4,571,803 |  | 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 | 135,011 |  | 148,234 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 765,708 |  | 885,588 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,007,136 |  | 1,059,334 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,316,856 |  | 1,287,471 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 872,627 |  | 776,898 |  |  |
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 474,465 |  | 555,301 |  |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 280,243 |  | 492,976 |  |  |
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 280,243 |  | 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 | 1,032,381 |  | 944,256 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 179,389 |  | 181,960 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 159,767 |  | 157,866 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 60,405 |  | 42,176 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 38,118 |  | 49,761 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 9,757 |  | 18,809 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 24,229 |  | 30,934 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 25,205 |  | 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 | 2,053 |  | 1,266 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 19,250 |  | 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 | 12,067 |  | 11,926 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 5,203 |  | 10,532 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,196 |  | 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 | 784 |  | 1,188 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 326 |  | 52 |  |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 326 |  | 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 | 46 |  | 115 |  |  |
Performing [Member] | Accruing Substandard [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 142,860 |  | 214,840 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 128,817 |  | 193,932 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 37,685 |  | 86,624 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 36,645 |  | 32,661 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 7,742 |  | 7,131 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 12,634 |  | 22,230 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 17,479 |  | 37,698 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Public finance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 11,819 |  | 6,439 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,262 |  | 1,289 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,081 |  | 3,054 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 6,501 |  | 12 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 1,208 |  |  |
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,975 |  | 876 |  |  |
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,191 |  | 10,026 |  |  |
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,191 |  | 9,730 |  |  |
Performing [Member] | Accruing 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] | Accruing Substandard [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 296 |  |  |
Performing [Member] | Accruing 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 | 135,444 |  | 123,476 |  |  |
Non-Graded, Recorded Investment | 37,022 |  | 39,771 |  |  |
Nonaccrual [Member] | Commercial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 47 |  | 53 |  |  |
Nonaccrual [Member] | Commercial [Member] | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Public finance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 47 |  | 53 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 20,132 |  | 20,279 |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 286 |  | 301 |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 |  |  |
Nonaccrual [Member] | Residential mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 537 |  | 1,991 |  |  |
Non-Graded, Recorded Investment | 19,628 |  | 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 |  |  |
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Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 |  |  |
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Nonaccrual [Member] | Personal [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 63 |  | 76 |  |  |
Non-Graded, Recorded Investment | $ 208 |  | $ 154 |  |  |

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