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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | $ 4,855,463 |  |  |
Financing Receivable, Originated, 2019 | 3,161,473 |  |  |
Financing Receivable, Originated, 2018 | 2,651,833 |  |  |
Financing Receivable, Originated, 2017 | 1,788,880 |  |  |
Financing Receivable, Originated, 2016 | 1,356,476 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,054,469 |  |  |
Financing Receivable, Revolving | 6,108,767 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 30,159 |  |  |
Total | 23,007,520 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | $ 19,826,731 |  |
Non-Graded, Recorded Investment |  | 1,924,256 |  |
Total | 23,007,520 | 21,750,987 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 179,129 |  |
Non-Graded, Related Allowance |  | 14,435 |  |
Total, Related Allowance | 388,640 | 210,759 | $ 207,457 | $ 230,682
Commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 1,657,760 |  |  |
Financing Receivable, Originated, 2019 | 1,557,142 |  |  |
Financing Receivable, Originated, 2018 | 1,461,282 |  |  |
Financing Receivable, Originated, 2017 | 1,013,619 |  |  |
Financing Receivable, Originated, 2016 | 747,318 |  |  |
Financing Receivable, Originated, 2015 or Prior | 1,603,533 |  |  |
Financing Receivable, Revolving | 5,033,683 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 3,198 |  |  |
Total | 13,077,535 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,997,538 |  |
Non-Graded, Recorded Investment |  | 34,112 |  |
Total | 13,077,535 | 14,031,650 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 117,236 |  |
Non-Graded, Related Allowance |  | 951 |  |
Total, Related Allowance | 254,934 | 118,187 | 102,226 | 124,269
Commercial [Member] | Energy [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 157,690 |  |  |
Financing Receivable, Originated, 2019 | 55,833 |  |  |
Financing Receivable, Originated, 2018 | 90,799 |  |  |
Financing Receivable, Originated, 2017 | 7,178 |  |  |
Financing Receivable, Originated, 2016 | 13,815 |  |  |
Financing Receivable, Originated, 2015 or Prior | 29,020 |  |  |
Financing Receivable, Revolving | 3,114,859 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 3,469,194 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,469,194 | 3,973,377 |  |
Commercial [Member] | Healthcare [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 536,745 |  |  |
Financing Receivable, Originated, 2019 | 642,739 |  |  |
Financing Receivable, Originated, 2018 | 639,676 |  |  |
Financing Receivable, Originated, 2017 | 423,763 |  |  |
Financing Receivable, Originated, 2016 | 234,531 |  |  |
Financing Receivable, Originated, 2015 or Prior | 680,890 |  |  |
Financing Receivable, Revolving | 147,646 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 3,305,990 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,305,990 | 3,033,916 |  |
Commercial [Member] | Services [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 540,265 |  |  |
Financing Receivable, Originated, 2019 | 452,269 |  |  |
Financing Receivable, Originated, 2018 | 399,264 |  |  |
Financing Receivable, Originated, 2017 | 326,282 |  |  |
Financing Receivable, Originated, 2016 | 381,902 |  |  |
Financing Receivable, Originated, 2015 or Prior | 700,028 |  |  |
Financing Receivable, Revolving | 707,891 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 682 |  |  |
Total | 3,508,583 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,508,583 | 3,122,163 |  |
Commercial [Member] | General business [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 423,060 |  |  |
Financing Receivable, Originated, 2019 | 406,301 |  |  |
Financing Receivable, Originated, 2018 | 331,543 |  |  |
Financing Receivable, Originated, 2017 | 256,396 |  |  |
Financing Receivable, Originated, 2016 | 117,070 |  |  |
Financing Receivable, Originated, 2015 or Prior | 193,595 |  |  |
Financing Receivable, Revolving | 1,063,287 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 2,516 |  |  |
Total | 2,793,768 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 2,793,768 |  |  |
Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,760,866 |  |
Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 665,449 |  |
Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 709,868 |  |
Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 766,011 |  |
Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 725,577 |  |  |
Financing Receivable, Originated, 2019 | 1,219,638 |  |  |
Financing Receivable, Originated, 2018 | 954,485 |  |  |
Financing Receivable, Originated, 2017 | 506,146 |  |  |
Financing Receivable, Originated, 2016 | 325,092 |  |  |
Financing Receivable, Originated, 2015 or Prior | 744,404 |  |  |
Financing Receivable, Revolving | 223,158 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 38 |  |  |
Total | 4,698,538 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,433,783 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Total | 4,698,538 | 4,433,783 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 51,805 |  |
Non-Graded, Related Allowance |  | 0 |  |
Total, Related Allowance | 86,558 | 51,805 | 60,026 | 56,621
Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 150,879 |  |
Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 775,521 |  |
Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 928,379 |  |
Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,265,562 |  |
Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 856,117 |  |
Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 457,325 |  |
Paycheck Protection Program |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 1,682,310 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 1,682,310 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 1,682,310 |  |  |
Related Allowance [Abstract] |  |  |  |
Total, Related Allowance | 0 |  |  |
Loans to individuals [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 789,816 |  |  |
Financing Receivable, Originated, 2019 | 384,693 |  |  |
Financing Receivable, Originated, 2018 | 236,066 |  |  |
Financing Receivable, Originated, 2017 | 269,115 |  |  |
Financing Receivable, Originated, 2016 | 284,066 |  |  |
Financing Receivable, Originated, 2015 or Prior | 706,532 |  |  |
Financing Receivable, Revolving | 851,926 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 26,923 |  |  |
Total | 3,549,137 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,549,137 |  |  |
Related Allowance [Abstract] |  |  |  |
Total, Related Allowance | 47,148 |  |  |
Loans to individuals [Member] | Permanent residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,057,321 |  |
Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 197,794 |  |
Loans to individuals [Member] | Home equity [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 829,057 |  |
Loans to individuals [Member] | Residential Mortgage [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 565,006 |  |  |
Financing Receivable, Originated, 2019 | 149,947 |  |  |
Financing Receivable, Originated, 2018 | 124,678 |  |  |
Financing Receivable, Originated, 2017 | 125,714 |  |  |
Financing Receivable, Originated, 2016 | 160,870 |  |  |
Financing Receivable, Originated, 2015 or Prior | 371,059 |  |  |
Financing Receivable, Revolving | 340,316 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 25,413 |  |  |
Total | 1,863,003 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 279,113 |  |
Non-Graded, Recorded Investment |  | 1,805,059 |  |
Total |  | 2,084,172 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 3,085 |  |
Non-Graded, Related Allowance |  | 11,315 |  |
Total, Related Allowance |  | 14,400 | 17,964 | 18,451
Loans to individuals [Member] | Residential Mortgage [Member] | US Government Agency Insured Loans |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 4,859 |  |  |
Financing Receivable, Originated, 2019 | 33,880 |  |  |
Financing Receivable, Originated, 2018 | 35,009 |  |  |
Financing Receivable, Originated, 2017 | 43,099 |  |  |
Financing Receivable, Originated, 2016 | 58,573 |  |  |
Financing Receivable, Originated, 2015 or Prior | 233,267 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 408,687 |  |  |
Loans to individuals [Member] | Personal [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 219,951 |  |  |
Financing Receivable, Originated, 2019 | 200,866 |  |  |
Financing Receivable, Originated, 2018 | 76,379 |  |  |
Financing Receivable, Originated, 2017 | 100,302 |  |  |
Financing Receivable, Originated, 2016 | 64,623 |  |  |
Financing Receivable, Originated, 2015 or Prior | 102,206 |  |  |
Financing Receivable, Revolving | 511,610 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 1,510 |  |  |
Total | 1,277,447 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,116,297 |  |
Non-Graded, Recorded Investment |  | 85,085 |  |
Total | 1,277,447 | 1,201,382 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 7,003 |  |
Non-Graded, Related Allowance |  | 2,169 |  |
Total, Related Allowance |  | 9,172 | 9,473 | 9,124
Loans to individuals [Member] | Home Equity Loan |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 829,057 |  |
Specific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 19,826,731 |  |
Non-Graded, Recorded Investment |  | 1,924,256 |  |
Total |  | 21,750,987 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 179,129 |  |
Non-Graded, Related Allowance |  | 14,435 |  |
Total, Related Allowance |  | 193,564 |  |
Nonspecific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Total |  | 0 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Related Allowance |  | 0 |  |
Non-Graded, Related Allowance |  | 0 |  |
Total, Related Allowance |  | 17,195 | $ 17,768 | $ 22,217
Performing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 1,886,858 |  |
Performing [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 19,312,702 |  |
Performing [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 210,149 |  |
Performing [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 160,326 |  |
Performing [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 34,075 |  |
Performing [Member] | Commercial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,538,705 |  |
Performing [Member] | Commercial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 187,881 |  |
Performing [Member] | Commercial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 155,573 |  |
Performing [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 112,614 |  |  |
Financing Receivable, Originated, 2019 | 51,863 |  |  |
Financing Receivable, Originated, 2018 | 89,346 |  |  |
Financing Receivable, Originated, 2017 | 7,178 |  |  |
Financing Receivable, Originated, 2016 | 1,148 |  |  |
Financing Receivable, Originated, 2015 or Prior | 7,956 |  |  |
Financing Receivable, Revolving | 2,548,663 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 2,818,768 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 3,700,406 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 202,590 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 202,590 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 117,298 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 24,000 |  |  |
Financing Receivable, Originated, 2019 | 1,363 |  |  |
Financing Receivable, Originated, 2018 | 1,453 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 12,667 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 283,294 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 322,777 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 63,951 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 536,745 |  |  |
Financing Receivable, Originated, 2019 | 615,221 |  |  |
Financing Receivable, Originated, 2018 | 638,302 |  |  |
Financing Receivable, Originated, 2017 | 422,834 |  |  |
Financing Receivable, Originated, 2016 | 234,399 |  |  |
Financing Receivable, Originated, 2015 or Prior | 658,286 |  |  |
Financing Receivable, Revolving | 147,132 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 3,252,919 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,995,514 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 27,500 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 8,282 |  |  |
Financing Receivable, Revolving | 5 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 35,787 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,117 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 1,191 |  |  |
Financing Receivable, Originated, 2017 | 929 |  |  |
Financing Receivable, Originated, 2016 | 132 |  |  |
Financing Receivable, Originated, 2015 or Prior | 11,387 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 13,639 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 20,805 |  |
Performing [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 534,853 |  |  |
Financing Receivable, Originated, 2019 | 436,384 |  |  |
Financing Receivable, Originated, 2018 | 372,867 |  |  |
Financing Receivable, Originated, 2017 | 307,374 |  |  |
Financing Receivable, Originated, 2016 | 373,785 |  |  |
Financing Receivable, Originated, 2015 or Prior | 683,936 |  |  |
Financing Receivable, Revolving | 665,491 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 682 |  |  |
Total | 3,375,372 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 3,050,946 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 150 |  |  |
Financing Receivable, Originated, 2019 | 9,057 |  |  |
Financing Receivable, Originated, 2018 | 389 |  |  |
Financing Receivable, Originated, 2017 | 291 |  |  |
Financing Receivable, Originated, 2016 | 2,038 |  |  |
Financing Receivable, Originated, 2015 or Prior | 2,000 |  |  |
Financing Receivable, Revolving | 3,063 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 16,988 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 29,943 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 429 |  |  |
Financing Receivable, Originated, 2019 | 6,380 |  |  |
Financing Receivable, Originated, 2018 | 26,008 |  |  |
Financing Receivable, Originated, 2017 | 6,027 |  |  |
Financing Receivable, Originated, 2016 | 5,030 |  |  |
Financing Receivable, Originated, 2015 or Prior | 7,954 |  |  |
Financing Receivable, Revolving | 38,797 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 90,625 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 33,791 |  |
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 419,756 |  |  |
Financing Receivable, Originated, 2019 | 394,985 |  |  |
Financing Receivable, Originated, 2018 | 310,273 |  |  |
Financing Receivable, Originated, 2017 | 236,222 |  |  |
Financing Receivable, Originated, 2016 | 103,987 |  |  |
Financing Receivable, Originated, 2015 or Prior | 186,600 |  |  |
Financing Receivable, Revolving | 1,055,878 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 2,316 |  |  |
Total | 2,710,017 |  |  |
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 197 |  |  |
Financing Receivable, Originated, 2019 | 4,519 |  |  |
Financing Receivable, Originated, 2018 | 9,713 |  |  |
Financing Receivable, Originated, 2017 | 7,803 |  |  |
Financing Receivable, Originated, 2016 | 2,511 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,159 |  |  |
Financing Receivable, Revolving | 2,483 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 19 |  |  |
Total | 30,404 |  |  |
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 1,432 |  |  |
Financing Receivable, Originated, 2019 | 3,069 |  |  |
Financing Receivable, Originated, 2018 | 6,694 |  |  |
Financing Receivable, Originated, 2017 | 10,935 |  |  |
Financing Receivable, Originated, 2016 | 10,042 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,729 |  |  |
Financing Receivable, Revolving | 4,449 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 140 |  |  |
Total | 40,490 |  |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,749,023 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,281 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,399 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 623,219 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 18,214 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,883 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 709,868 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 34,075 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 709,729 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,028 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 17,744 |  |
Performing [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 725,577 |  |  |
Financing Receivable, Originated, 2019 | 1,211,338 |  |  |
Financing Receivable, Originated, 2018 | 954,226 |  |  |
Financing Receivable, Originated, 2017 | 489,193 |  |  |
Financing Receivable, Originated, 2016 | 314,899 |  |  |
Financing Receivable, Originated, 2015 or Prior | 722,475 |  |  |
Financing Receivable, Revolving | 223,131 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 38 |  |  |
Total | 4,640,877 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,381,663 |  |
Performing [Member] | Commercial real estate [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 259 |  |  |
Financing Receivable, Originated, 2017 | 12,311 |  |  |
Financing Receivable, Originated, 2016 | 2,725 |  |  |
Financing Receivable, Originated, 2015 or Prior | 5,831 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 21,126 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 22,145 |  |
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 4,410 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 4,852 |  |  |
Financing Receivable, Revolving | 27 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 9,289 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,349 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 150,529 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 743,343 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 12,067 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,243 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 923,202 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,177 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,257,005 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,604 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 95 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 852,539 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,658 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,011 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 455,045 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,639 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Paycheck Protection Program | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 1,682,310 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 1,682,310 |  |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 758,260 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 276,138 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 78 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,404 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 191,694 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 1,767,930 |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 564,325 |  |  |
Financing Receivable, Originated, 2019 | 149,832 |  |  |
Financing Receivable, Originated, 2018 | 120,875 |  |  |
Financing Receivable, Originated, 2017 | 124,930 |  |  |
Financing Receivable, Originated, 2016 | 158,801 |  |  |
Financing Receivable, Originated, 2015 or Prior | 348,292 |  |  |
Financing Receivable, Revolving | 335,259 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 24,553 |  |  |
Total | 1,826,867 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 276,138 |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 33 |  |  |
Financing Receivable, Originated, 2019 | 11 |  |  |
Financing Receivable, Originated, 2018 | 2,094 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 59 |  |  |
Financing Receivable, Originated, 2015 or Prior | 318 |  |  |
Financing Receivable, Revolving | 950 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 10 |  |  |
Total | 3,475 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 78 |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 51 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 34 |  |  |
Financing Receivable, Revolving | 272 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 76 |  |  |
Total | 433 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,404 |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | US Government Agency Insured Loans | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 4,859 |  |  |
Financing Receivable, Originated, 2019 | 33,880 |  |  |
Financing Receivable, Originated, 2018 | 34,464 |  |  |
Financing Receivable, Originated, 2017 | 43,099 |  |  |
Financing Receivable, Originated, 2016 | 58,264 |  |  |
Financing Receivable, Originated, 2015 or Prior | 226,380 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 400,946 |  |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | US Government Agency Insured Loans | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 0 |  |  |
Performing [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | US Government Agency Insured Loans | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 0 |  |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 84,853 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 219,873 |  |  |
Financing Receivable, Originated, 2019 | 200,580 |  |  |
Financing Receivable, Originated, 2018 | 76,246 |  |  |
Financing Receivable, Originated, 2017 | 100,229 |  |  |
Financing Receivable, Originated, 2016 | 64,104 |  |  |
Financing Receivable, Originated, 2015 or Prior | 102,126 |  |  |
Financing Receivable, Revolving | 510,571 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 1,510 |  |  |
Total | 1,275,239 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,116,196 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 39 |  |  |
Financing Receivable, Originated, 2019 | 55 |  |  |
Financing Receivable, Originated, 2018 | 66 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 469 |  |  |
Financing Receivable, Originated, 2015 or Prior | 31 |  |  |
Financing Receivable, Revolving | 965 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 1,625 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 45 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 11 |  |  |
Financing Receivable, Originated, 2019 | 214 |  |  |
Financing Receivable, Originated, 2018 | 10 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 29 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 264 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 817,976 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 143,554 |  |
Non-Graded, Recorded Investment |  | 37,398 |  |
Nonaccrual [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 115,379 |  |
Non-Graded, Recorded Investment |  | 37 |  |
Nonaccrual [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 91,722 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Energy [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 21,076 |  |  |
Financing Receivable, Originated, 2019 | 2,607 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 21,064 |  |  |
Financing Receivable, Revolving | 80,312 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 125,059 |  |  |
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,480 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 18 |  |  |
Financing Receivable, Originated, 2018 | 183 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 2,935 |  |  |
Financing Receivable, Revolving | 509 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 3,645 |  |  |
Nonaccrual [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 7,483 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Services [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 4,833 |  |  |
Financing Receivable, Originated, 2019 | 448 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 12,590 |  |  |
Financing Receivable, Originated, 2016 | 1,049 |  |  |
Financing Receivable, Originated, 2015 or Prior | 6,138 |  |  |
Financing Receivable, Revolving | 540 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 25,598 |  |  |
Nonaccrual [Member] | Commercial [Member] | General business [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 1,675 |  |  |
Financing Receivable, Originated, 2019 | 3,728 |  |  |
Financing Receivable, Originated, 2018 | 4,863 |  |  |
Financing Receivable, Originated, 2017 | 1,436 |  |  |
Financing Receivable, Originated, 2016 | 530 |  |  |
Financing Receivable, Originated, 2015 or Prior | 107 |  |  |
Financing Receivable, Revolving | 477 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 41 |  |  |
Total | 12,857 |  |  |
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,163 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 10,133 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 398 |  |
Non-Graded, Recorded Investment |  | 37 |  |
Nonaccrual [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 27,626 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 8,300 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 232 |  |  |
Financing Receivable, Originated, 2016 | 7,468 |  |  |
Financing Receivable, Originated, 2015 or Prior | 11,246 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 27,246 |  |  |
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 350 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 18,868 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 6,858 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 909 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 641 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonaccrual [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 493 |  |
Non-Graded, Recorded Investment |  | 19,948 |  |
Nonaccrual [Member] | Loans to individuals [Member] | Permanent residential mortgage [Member] | Loans Insured or Guaranteed by US Government Authorities |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 6,100 |  |
Nonaccrual [Member] | Loans to individuals [Member] | Residential Mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 493 |  |
Non-Graded, Recorded Investment |  | 37,129 |  |
Nonaccrual [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 648 |  |  |
Financing Receivable, Originated, 2019 | 104 |  |  |
Financing Receivable, Originated, 2018 | 1,658 |  |  |
Financing Receivable, Originated, 2017 | 784 |  |  |
Financing Receivable, Originated, 2016 | 2,010 |  |  |
Financing Receivable, Originated, 2015 or Prior | 22,415 |  |  |
Financing Receivable, Revolving | 3,835 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 774 |  |  |
Total | 32,228 |  |  |
Nonaccrual [Member] | Loans to individuals [Member] | Residential Mortgage [Member] | US Government Agency Insured Loans | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 545 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 309 |  |  |
Financing Receivable, Originated, 2015 or Prior | 6,887 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 7,741 |  |  |
Nonaccrual [Member] | Loans to individuals [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 56 |  |
Non-Graded, Recorded Investment |  | 232 |  |
Nonaccrual [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccruing substandard and doubtful |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 28 |  |  |
Financing Receivable, Originated, 2019 | 17 |  |  |
Financing Receivable, Originated, 2018 | 57 |  |  |
Financing Receivable, Originated, 2017 | 73 |  |  |
Financing Receivable, Originated, 2016 | 50 |  |  |
Financing Receivable, Originated, 2015 or Prior | 49 |  |  |
Financing Receivable, Revolving | 45 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | $ 319 |  |  |
Nonaccrual [Member] | Loans to individuals [Member] | Home Equity Loan |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | $ 11,081 |  |

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