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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | $ 16,203,838 |  | $ 15,297,889 | $ 15,341,394 |  |
Non-Graded, Recorded Investment | 1,799,858 |  | 1,855,535 | 1,842,251 |  |
Total | 18,003,696 |  | 17,153,424 | 17,183,645 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 181,303 |  | 189,412 | 204,117 |  |
Non-Graded, Allowance | 18,367 |  | 19,053 | 18,570 |  |
Total | 215,142 | $ 223,967 | 230,682 | 250,061 | $ 248,710 | $ 246,159
Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 11,323,917 |  | 10,706,035 | 10,612,477 |  |
Non-Graded, Recorded Investment | 25,122 |  | 27,940 | 25,478 |  |
Total | 11,349,039 |  | 10,733,975 | 10,637,955 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 112,842 |  | 123,383 | 136,819 |  |
Non-Graded, Allowance | 880 |  | 886 | 923 |  |
Total | 113,722 | 120,083 | 124,269 | 137,742 | 137,616 | 140,213
Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 3,147,219 |  | 2,930,156 | 2,847,240 |  |
Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 2,944,499 |  | 2,986,949 | 2,958,827 |  |
Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,699,554 |  | 1,471,256 | 1,543,695 |  |
Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 647,816 |  | 496,774 | 546,137 |  |
Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 2,353,722 |  | 2,314,753 | 2,221,518 |  |
Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 556,229 |  | 534,087 | 520,538 |  |
Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 3,712,220 |  | 3,479,987 | 3,688,592 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Total | 3,712,220 |  | 3,479,987 | 3,688,592 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 58,758 |  | 56,621 | 58,580 |  |
Non-Graded, Allowance | 0 |  | 0 | 0 |  |
Total | 58,758 | 57,070 | 56,621 | 58,580 | 58,343 | 50,749
Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 118,999 |  | 117,245 | 141,592 |  |
Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 768,024 |  | 691,532 | 722,805 |  |
Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 820,127 |  | 831,770 | 862,973 |  |
Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,056,984 |  | 980,017 | 952,380 |  |
Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 653,384 |  | 573,014 | 693,635 |  |
Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 294,702 |  | 286,409 | 315,207 |  |
Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 250,081 |  | 234,477 | 216,007 |  |
Non-Graded, Recorded Investment | 1,692,169 |  | 1,739,209 | 1,723,191 |  |
Total | 1,942,250 |  | 1,973,686 | 1,939,198 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 3,082 |  | 2,947 | 2,976 |  |
Non-Graded, Allowance | 15,462 |  | 15,504 | 15,283 |  |
Total | 18,544 | 18,431 | 18,451 | 18,259 | 18,177 | 18,224
Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 1,068,412 |  | 1,043,435 | 989,040 |  |
Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 169,653 |  | 197,506 | 191,729 |  |
Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Total | 704,185 |  | 732,745 | 758,429 |  |
Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 917,620 |  | 877,390 | 824,318 |  |
Non-Graded, Recorded Investment | 82,567 |  | 88,386 | 93,582 |  |
Total | 1,000,187 |  | 965,776 | 917,900 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 6,621 |  | 6,461 | 5,742 |  |
Non-Graded, Allowance | 2,025 |  | 2,663 | 2,364 |  |
Total | 8,646 | 8,408 | 9,124 | 8,106 | 7,247 | 8,773
Specific Allowance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 16,203,838 |  | 15,297,889 | 15,341,394 |  |
Non-Graded, Recorded Investment | 1,799,858 |  | 1,855,535 | 1,842,251 |  |
Total | 18,003,696 |  | 17,153,424 | 17,183,645 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 181,303 |  | 189,412 | 204,117 |  |
Non-Graded, Allowance | 18,367 |  | 19,053 | 18,570 |  |
Total | 199,670 |  | 208,465 | 222,687 |  |
Nonspecific Allowance [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Total | 0 |  | 0 | 0 |  |
Related Allowance [Abstract] |  |  |  |  |  |
Internally Risk Graded, Allowance | 0 |  | 0 | 0 |  |
Non-Graded, Allowance | 0 |  | 0 | 0 |  |
Total | 15,472 | $ 19,975 | 22,217 | 27,374 | $ 27,327 | $ 28,200
Performing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 1,758,197 |  | 1,808,995 | 1,799,001 |  |
Performing [Member] | Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 25,009 |  | 27,870 | 25,374 |  |
Performing [Member] | Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 25,009 |  | 27,870 | 25,374 |  |
Performing [Member] | Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 1,650,882 |  | 1,692,925 | 1,680,229 |  |
Performing [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 796,282 |  | 784,928 | 750,891 |  |
Performing [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 162,086 |  | 188,327 | 182,677 |  |
Performing [Member] | Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 692,514 |  | 719,670 | 746,661 |  |
Performing [Member] | Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Non-Graded, Recorded Investment | 82,306 |  | 88,200 | 93,398 |  |
Performing [Member] | Pass [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 15,815,960 |  | 14,797,279 | 14,613,315 |  |
Performing [Member] | Pass [Member] | Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 10,971,935 |  | 10,226,089 | 9,902,434 |  |
Performing [Member] | Pass [Member] | Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,936,184 |  | 2,632,986 | 2,376,368 |  |
Performing [Member] | Pass [Member] | Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,903,168 |  | 2,943,869 | 2,921,510 |  |
Performing [Member] | Pass [Member] | Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,679,834 |  | 1,443,917 | 1,507,063 |  |
Performing [Member] | Pass [Member] | Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 620,687 |  | 472,869 | 513,442 |  |
Performing [Member] | Pass [Member] | Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,319,035 |  | 2,253,497 | 2,130,339 |  |
Performing [Member] | Pass [Member] | Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 513,027 |  | 478,951 | 453,712 |  |
Performing [Member] | Pass [Member] | Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 3,680,096 |  | 3,463,002 | 3,675,014 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 116,821 |  | 113,190 | 138,790 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 745,691 |  | 686,915 | 720,730 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 812,848 |  | 824,408 | 859,722 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,056,953 |  | 979,969 | 947,950 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 653,384 |  | 573,014 | 693,635 |  |
Performing [Member] | Pass [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 294,399 |  | 285,506 | 314,187 |  |
Performing [Member] | Pass [Member] | Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 246,470 |  | 232,492 | 212,563 |  |
Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 246,470 |  | 232,492 | 212,563 |  |
Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Pass [Member] | Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Pass [Member] | Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 917,459 |  | 875,696 | 823,304 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 123,856 |  | 118,175 | 198,575 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 93,803 |  | 103,324 | 192,204 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 52,350 |  | 60,288 | 120,473 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 30,564 |  | 13,927 | 12,452 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 900 |  | 19,263 | 16,224 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 7,559 |  | 6,653 | 6,540 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,030 |  | 3,186 | 33,554 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 400 |  | 7 | 2,961 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 30,005 |  | 13,303 | 4,629 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,828 |  | 1,828 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 21,173 |  | 4,243 | 1,774 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 7,004 |  | 7,087 | 2,855 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 145 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 1,693 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 1,693 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 48 |  | 1,548 | 49 |  |
Performing [Member] | Substandard [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 140,026 |  | 241,101 | 327,315 |  |
Performing [Member] | Substandard [Member] | Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 137,314 |  | 239,389 | 320,786 |  |
Performing [Member] | Substandard [Member] | Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 93,088 |  | 144,598 | 226,407 |  |
Performing [Member] | Substandard [Member] | Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 6,390 |  | 26,533 | 17,111 |  |
Performing [Member] | Substandard [Member] | Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 4,725 |  | 5,502 | 9,788 |  |
Performing [Member] | Substandard [Member] | Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 16,579 |  | 11,290 | 16,499 |  |
Performing [Member] | Substandard [Member] | Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 16,532 |  | 43,305 | 33,120 |  |
Performing [Member] | Substandard [Member] | Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 8,161 | 17,861 |  |
Performing [Member] | Substandard [Member] | Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 123 |  | 827 | 5,174 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 395 | 751 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 92 |  | 98 | 0 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 31 |  | 48 | 4,420 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 286 | 3 |  |
Performing [Member] | Substandard [Member] | Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,555 |  | 822 | 478 |  |
Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 2,555 |  | 822 | 478 |  |
Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Performing [Member] | Substandard [Member] | Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 34 |  | 63 | 877 |  |
Nonaccrual [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 123,996 |  | 141,334 | 202,189 |  |
Non-Graded, Recorded Investment | 41,661 |  | 46,540 | 43,250 |  |
Nonaccrual [Member] | Commercial |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 120,865 |  | 137,233 | 197,053 |  |
Non-Graded, Recorded Investment | 113 |  | 70 | 104 |  |
Nonaccrual [Member] | Commercial | Energy [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 65,597 |  | 92,284 | 123,992 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial | Services [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 4,377 |  | 2,620 | 7,754 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial | Wholesale/retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial | Manufacturing [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial | Healthcare [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 16,125 |  | 14,765 | 24,505 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial | Other commercial and industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 113 |  | 70 | 104 |  |
Nonaccrual [Member] | Commercial real estate |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
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Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 350 |  | 1,832 | 2,051 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Retail [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,068 |  | 276 | 301 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Office [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 275 |  | 275 | 396 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Multifamily [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 10 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Industrial [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 303 |  | 472 | 1,017 |  |
Non-Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Nonaccrual [Member] | Residential mortgage |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,056 |  | 1,163 | 1,273 |  |
Non-Graded, Recorded Investment | 41,287 |  | 46,284 | 42,962 |  |
Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 1,056 |  | 1,163 | 1,273 |  |
Non-Graded, Recorded Investment | 22,049 |  | 24,030 | 22,142 |  |
Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Non-Graded, Recorded Investment | 7,567 |  | 9,179 | 9,052 |  |
Nonaccrual [Member] | Residential mortgage | Home equity [Member] |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 0 |  | 0 | 0 |  |
Non-Graded, Recorded Investment | 11,671 |  | 13,075 | 11,768 |  |
Nonaccrual [Member] | Personal |  |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |  |
Internally Risk Graded, Recorded Investment | 79 |  | 83 | 88 |  |
Non-Graded, Recorded Investment | $ 261 |  | $ 186 | $ 184 |  |

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