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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment $ 20,247,218   $ 19,805,403      
Non-Graded, Recorded Investment 2,008,434   1,851,327      
Total 22,255,652   21,656,730      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 170,015   171,272      
Non-Graded, Allowance 15,682   18,417      
Total 202,534 $ 205,340 207,457 $ 215,142 $ 223,967 $ 230,682
Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 14,307,867   13,586,654      
Non-Graded, Recorded Investment 29,041   49,424      
Total 14,336,908   13,636,078      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 105,435   101,303      
Non-Graded, Allowance 962   923      
Total 106,397 103,577 102,226 113,722 120,083 124,269
Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Total 3,921,353   3,590,333      
Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Total 3,309,458   3,258,192      
Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Total 1,793,118   1,621,158      
Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Total 761,357   730,521      
Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Total 2,926,510   2,799,277      
Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Total 795,659   804,550      
Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Total 829,453   832,047      
Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,710,033   4,764,813      
Non-Graded, Recorded Investment 0   0      
Total 4,710,033   4,764,813      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 54,188   60,026      
Non-Graded, Allowance 0   0      
Total 54,188 58,134 60,026 58,758 57,070 56,621
Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Total 141,509   148,584      
Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Total 825,399   919,082      
Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Total 1,056,306   1,072,920      
Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Total 1,300,372   1,288,065      
Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Total 828,569   778,106      
Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Total 557,878   558,056      
Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 279,905   505,046      
Non-Graded, Recorded Investment 1,890,917   1,724,987      
Total 2,170,822   2,230,033      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 3,318   3,310      
Non-Graded, Allowance 12,406   14,654      
Total 15,724 15,668 17,964 18,544 18,431 18,451
Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Total 1,088,370   1,122,610      
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Total 195,373   190,866      
Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Total 887,079   916,557      
Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 949,413   948,890      
Non-Graded, Recorded Investment 88,476   76,916      
Total 1,037,889   1,025,806      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 7,074   6,633      
Non-Graded, Allowance 2,314   2,840      
Total 9,388 8,783 9,473 8,646 8,408 9,124
Specific Allowance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 20,247,218   19,805,403      
Non-Graded, Recorded Investment 2,008,434   1,851,327      
Total 22,255,652   21,656,730      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 170,015   171,272      
Non-Graded, Allowance 15,682   18,417      
Total 185,697   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 16,837 $ 19,178 17,768 $ 15,472 $ 19,975 $ 22,217
Performing [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 1,970,516   1,811,557      
Performing [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 28,959   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 28,959   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 1,853,242   1,685,424      
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 787,464   819,199      
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 188,630   183,734      
Performing [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 877,148   682,491      
Performing [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 88,315   76,762      
Performing [Member] | Pass [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 19,798,876   19,285,126      
Performing [Member] | Pass [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,912,387   13,135,068      
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,774,846   3,414,039      
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,221,580   3,167,203      
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,767,002   1,593,902      
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 709,460   668,438      
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,882,190   2,730,121      
Performing [Member] | Pass [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 795,659   804,550      
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 761,650   756,815      
Performing [Member] | Pass [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,660,449   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 141,159   148,234      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 792,406   885,588      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,048,029   1,059,334      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,293,248   1,287,471      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 828,569   776,898      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 557,038   555,301      
Performing [Member] | Pass [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 276,782   492,976      
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 276,782   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 949,258   944,256      
Performing [Member] | Other Loans Especially Mentioned [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 141,358   181,960      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 123,589   157,866      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 12,871   42,176      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 50,662   49,761      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,080   18,809      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 29,056   30,934      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 15,089   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 2,831   1,266      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 17,608   23,927      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 11,664   11,926      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,197   10,532      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,200   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 547   1,188      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 115   52      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 115   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] | Substandard [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 161,123   214,840      
Performing [Member] | Substandard [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 148,578   193,932      
Performing [Member] | Substandard [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 62,004   86,624      
Performing [Member] | Substandard [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 27,129   32,661      
Performing [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 11,646   7,131      
Performing [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 14,228   22,230      
Performing [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,083   37,698      
Performing [Member] | Substandard [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 20,488   7,588      
Performing [Member] | Substandard [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 10,306   6,439      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,272   1,289      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,225   3,054      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 5,649   12      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   1,208      
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 160   876      
Performing [Member] | Substandard [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,206   10,026      
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,206   9,730      
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   296      
Performing [Member] | Substandard [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 33   4,443      
Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 145,862   123,476      
Non-Graded, Recorded Investment 37,917   39,771      
Nonaccrual [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 123,313   99,788      
Non-Graded, Recorded Investment 82   53      
Nonaccrual [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 71,632   47,494      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 10,087   8,567      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,390   1,316      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 8,613   8,919      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 16,148   16,538      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 15,443   16,954      
Non-Graded, Recorded Investment 82   53      
Nonaccrual [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 21,670   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 20,057   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 275   301      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 133   691      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 803   1,991      
Non-Graded, Recorded Investment 37,674   39,564      
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 803   1,991      
Non-Graded, Recorded Investment 21,000   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 6,743   7,132      
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 9,931   10,472      
Nonaccrual [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 76   76      
Non-Graded, Recorded Investment $ 161   $ 154