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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
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]            
Internally Risk Graded, Recorded Investment 16,632   7,588      
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]            
Internally Risk Graded, Recorded Investment 111,659   99,788      
Non-Graded, Recorded Investment 47   53      
Nonaccrual [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 88,894   47,494      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 6,119   8,567      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,504   1,316      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 8,741   8,919      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 5,978   16,538      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 423   16,954      
Non-Graded, Recorded Investment 47   53      
Nonaccrual [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 23,185   21,621      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 350   350      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 20,132   20,279      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 855   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 286   301      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 909   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 653   691      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 537   1,991      
Non-Graded, Recorded Investment 36,767   39,564      
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      
Non-Graded, Recorded Investment 6,332   7,132      
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 10,807   10,472      
Nonaccrual [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 63   76      
Non-Graded, Recorded Investment $ 208   $ 154