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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One $ 2,443,279   $ 2,443,279   $ 3,743,425
Financing Receivable, Originated, Year Two 3,069,840   3,069,840   4,522,989
Financing Receivable, Originated, Year Three 4,497,611   4,497,611   2,982,784
Financing Receivable, Originated, Year Four 2,515,930   2,515,930   1,756,064
Financing Receivable, Originated, Year Five 1,486,183   1,486,183   1,234,871
Financing Receivable, Originated, More Than Five Years 3,449,605   3,449,605   3,094,093
Financing Receivable, Revolving 6,497,659   6,497,659   6,543,149
Financing Receivable, Revolving, Converted to Term Loan 24,954   24,954   27,593
Total 23,985,061   23,985,061   23,904,968
Financing Receivable, Allowance for Credit Loss, Writeoff 2,496 $ 10,593 17,496 $ 22,309  
Commercial [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 1,656,201   1,656,201   2,698,113
Financing Receivable, Originated, Year Two 2,046,823   2,046,823   2,026,636
Financing Receivable, Originated, Year Three 1,857,959   1,857,959   1,293,089
Financing Receivable, Originated, Year Four 1,152,641   1,152,641   846,923
Financing Receivable, Originated, Year Five 745,926   745,926   576,627
Financing Receivable, Originated, More Than Five Years 1,945,556   1,945,556   1,839,613
Financing Receivable, Revolving 5,470,548   5,470,548   5,519,976
Financing Receivable, Revolving, Converted to Term Loan 2,268   2,268   2,792
Total 14,877,922   14,877,922   14,803,769
Financing Receivable, Allowance for Credit Loss, Writeoff 856 6,769 11,487 9,578  
Commercial [Member] | Healthcare [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 442,818   442,818   650,768
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Two 610,301   610,301   897,730
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Three 984,451   984,451   609,244
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Four 524,216   524,216   467,993
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Five 413,697   413,697   355,026
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0   2,500
Financing Receivable, Originated, More Than Five Years 912,798   912,798   880,099
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     7,240   0
Financing Receivable, Revolving 260,777   260,777   282,358
Financing Receivable Revolving Writeoff     0   0
Financing Receivable, Revolving, Converted to Term Loan 11   11   15
Financing Receivable Revolving Converted to Term Writeoff     0   0
Total 4,149,069   4,149,069   4,143,233
Financing Receivable, Allowance for Credit Loss, Writeoff     7,240   2,500
Commercial [Member] | Services [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 480,824   480,824   900,090
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Two 673,043   673,043   541,573
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Three 460,064   460,064   405,205
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0   3,060
Financing Receivable, Originated, Year Four 428,601   428,601   230,823
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Five 202,391   202,391   110,618
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     22   0
Financing Receivable, Originated, More Than Five Years 657,400   657,400   651,745
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     80   0
Financing Receivable, Revolving 670,929   670,929   735,561
Financing Receivable Revolving Writeoff     9   2,642
Financing Receivable, Revolving, Converted to Term Loan 418   418   608
Financing Receivable Revolving Converted to Term Writeoff     0   0
Total 3,573,670   3,573,670   3,576,223
Financing Receivable, Allowance for Credit Loss, Writeoff     111   5,702
Commercial [Member] | Energy [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 145,706   145,706   190,122
Financing Receivable, Originated, Year Two 86,682   86,682   100,006
Financing Receivable, Originated, Year Three 40,426   40,426   43,769
Financing Receivable, Originated, Year Four 2,618   2,618   7,876
Financing Receivable, Originated, Year Five 7,199   7,199   9,562
Financing Receivable, Originated, More Than Five Years 19,806   19,806   11,682
Financing Receivable, Revolving 2,824,198   2,824,198   3,074,084
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 3,126,635   3,126,635   3,437,101
Commercial [Member] | General business [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 586,853   586,853   957,133
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Two 676,797   676,797   487,327
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     27   0
Financing Receivable, Originated, Year Three 373,018   373,018   234,871
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     1,465   4,598
Financing Receivable, Originated, Year Four 197,206   197,206   140,231
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     0   2
Financing Receivable, Originated, Year Five 122,639   122,639   101,421
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, More Than Five Years 355,552   355,552   296,087
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     164   48
Financing Receivable, Revolving 1,714,644   1,714,644   1,427,973
Financing Receivable Revolving Writeoff     2,390   10
Financing Receivable, Revolving, Converted to Term Loan 1,839   1,839   2,169
Financing Receivable Revolving Converted to Term Writeoff     90   38
Total 4,028,548   4,028,548   3,647,212
Financing Receivable, Allowance for Credit Loss, Writeoff     4,136   4,696
Commercial real estate [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 207,236   207,236   399,883
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Two 486,586   486,586   1,942,389
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Three 2,176,796   2,176,796   1,194,762
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Four 910,081   910,081   416,647
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Five 305,372   305,372   520,725
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, More Than Five Years 964,067   964,067   727,146
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     1,455   8,446
Financing Receivable, Revolving 138,517   138,517   136,095
Financing Receivable Revolving Writeoff     0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Financing Receivable Revolving Converted to Term Writeoff     0   0
Total 5,188,655   5,188,655   5,337,647
Financing Receivable, Allowance for Credit Loss, Writeoff 0 2,238 1,455 8,446 8,446
Loans to individuals [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 579,842   579,842   645,429
Financing Receivable, Originated, Year Two 536,431   536,431   553,964
Financing Receivable, Originated, Year Three 462,856   462,856   494,933
Financing Receivable, Originated, Year Four 453,208   453,208   492,494
Financing Receivable, Originated, Year Five 434,885   434,885   137,519
Financing Receivable, Originated, More Than Five Years 539,982   539,982   527,334
Financing Receivable, Revolving 888,594   888,594   887,078
Financing Receivable, Revolving, Converted to Term Loan 22,686   22,686   24,801
Total 3,918,484   3,918,484   3,763,552
Financing Receivable, Allowance for Credit Loss, Writeoff 1,640 $ 1,586 4,554 $ 4,285  
Loans to individuals [Member] | Residential mortgage [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 384,728   384,728   426,325
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, Year Two 366,125   366,125   322,442
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     43   0
Financing Receivable, Originated, Year Three 298,667   298,667   343,295
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0   51
Financing Receivable, Originated, Year Four 326,806   326,806   351,647
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     0   4
Financing Receivable, Originated, Year Five 322,459   322,459   55,200
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0   0
Financing Receivable, Originated, More Than Five Years 260,129   260,129   255,920
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     11   17
Financing Receivable, Revolving 388,779   388,779   381,158
Financing Receivable Revolving Writeoff     9   0
Financing Receivable, Revolving, Converted to Term Loan 22,600   22,600   24,653
Financing Receivable Revolving Converted to Term Writeoff     0   1
Total 2,370,293   2,370,293   2,160,640
Financing Receivable, Allowance for Credit Loss, Writeoff     63   73
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   633
Financing Receivable, Originated, Year Two 1,997   1,997   1,788
Financing Receivable, Originated, Year Three 2,925   2,925   2,220
Financing Receivable, Originated, Year Four 2,456   2,456   4,577
Financing Receivable, Originated, Year Five 3,766   3,766   6,816
Financing Receivable, Originated, More Than Five Years 116,603   116,603   133,773
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 127,747   127,747   149,807
Loans to individuals [Member] | Personal [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 195,114   195,114   218,471
Financing Receivable Year One Originated Current Fiscal Year Writeoff     4,280 [1]   5,636 [2]
Financing Receivable, Originated, Year Two 168,309   168,309   229,734
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     69 [1]   82 [2]
Financing Receivable, Originated, Year Three 161,264   161,264   149,418
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     47 [1]   96 [2]
Financing Receivable, Originated, Year Four 123,946   123,946   136,270
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff     42 [1]   43 [2]
Financing Receivable, Originated, Year Five 108,660   108,660   75,503
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     7 [1]   0 [2]
Financing Receivable, Originated, More Than Five Years 163,250   163,250   137,641
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     0 [1]   10 [2]
Financing Receivable, Revolving 499,815   499,815   505,920
Financing Receivable Revolving Writeoff     26 [1]   6 [2]
Financing Receivable, Revolving, Converted to Term Loan 86   86   148
Financing Receivable Revolving Converted to Term Writeoff     20 [1]   26 [2]
Total 1,420,444   1,420,444   1,453,105
Financing Receivable, Allowance for Credit Loss, Writeoff     4,491 [1]   5,899 [2]
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 442,818   442,818   650,768
Financing Receivable, Originated, Year Two 595,301   595,301   895,602
Financing Receivable, Originated, Year Three 951,875   951,875   590,736
Financing Receivable, Originated, Year Four 502,829   502,829   409,001
Financing Receivable, Originated, Year Five 355,731   355,731   331,897
Financing Receivable, Originated, More Than Five Years 835,842   835,842   809,858
Financing Receivable, Revolving 259,118   259,118   281,378
Financing Receivable, Revolving, Converted to Term Loan 11   11   15
Total 3,943,525   3,943,525   3,969,255
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 15,000   15,000   0
Financing Receivable, Originated, Year Three 27,223   27,223   0
Financing Receivable, Originated, Year Four 1,361   1,361   21,791
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 46,499   46,499   31,235
Financing Receivable, Revolving 505   505   5
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 90,588   90,588   53,031
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   2,128
Financing Receivable, Originated, Year Three 5,249   5,249   18,508
Financing Receivable, Originated, Year Four 17,932   17,932   6,911
Financing Receivable, Originated, Year Five 57,966   57,966   0
Financing Receivable, Originated, More Than Five Years 16,728   16,728   10,896
Financing Receivable, Revolving 1,154   1,154   975
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 99,029   99,029   39,418
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 480,824   480,824   900,090
Financing Receivable, Originated, Year Two 670,546   670,546   526,776
Financing Receivable, Originated, Year Three 453,306   453,306   401,872
Financing Receivable, Originated, Year Four 427,841   427,841   228,818
Financing Receivable, Originated, Year Five 200,459   200,459   106,112
Financing Receivable, Originated, More Than Five Years 642,779   642,779   643,477
Financing Receivable, Revolving 653,202   653,202   730,729
Financing Receivable, Revolving, Converted to Term Loan 418   418   595
Total 3,529,375   3,529,375   3,538,469
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 1,729   1,729   1,085
Financing Receivable, Originated, Year Three 135   135   1,520
Financing Receivable, Originated, Year Four 739   739   1,341
Financing Receivable, Originated, Year Five 447   447   534
Financing Receivable, Originated, More Than Five Years 9,186   9,186   4,522
Financing Receivable, Revolving 15,150   15,150   81
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 27,386   27,386   9,083
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 768   768   13,712
Financing Receivable, Originated, Year Three 6,623   6,623   178
Financing Receivable, Originated, Year Four 21   21   326
Financing Receivable, Originated, Year Five 1,485   1,485   3,972
Financing Receivable, Originated, More Than Five Years 5,435   5,435   3,746
Financing Receivable, Revolving 1,152   1,152   3,108
Financing Receivable, Revolving, Converted to Term Loan 0   0   13
Total 15,484   15,484   25,055
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 145,706   145,706   190,122
Financing Receivable, Originated, Year Two 86,682   86,682   100,006
Financing Receivable, Originated, Year Three 40,426   40,426   43,769
Financing Receivable, Originated, Year Four 2,618   2,618   7,876
Financing Receivable, Originated, Year Five 7,199   7,199   9,562
Financing Receivable, Originated, More Than Five Years 19,736   19,736   11,583
Financing Receivable, Revolving 2,782,432   2,782,432   3,025,590
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 3,084,799   3,084,799   3,388,508
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 0   0   0
Financing Receivable, Revolving 0   0   13,950
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 0   0   13,950
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 0   0   0
Financing Receivable, Revolving 12,850   12,850   16,800
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 12,850   12,850   16,800
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 585,622   585,622   942,468
Financing Receivable, Originated, Year Two 655,994   655,994   436,832
Financing Receivable, Originated, Year Three 320,646   320,646   224,735
Financing Receivable, Originated, Year Four 184,779   184,779   138,951
Financing Receivable, Originated, Year Five 121,167   121,167   101,100
Financing Receivable, Originated, More Than Five Years 347,249   347,249   287,744
Financing Receivable, Revolving 1,699,086   1,699,086   1,389,128
Financing Receivable, Revolving, Converted to Term Loan 1,692   1,692   2,164
Total 3,916,235   3,916,235   3,523,122
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   10,264
Financing Receivable, Originated, Year Two 5,276   5,276   16,167
Financing Receivable, Originated, Year Three 4,629   4,629   8,420
Financing Receivable, Originated, Year Four 7,227   7,227   1,253
Financing Receivable, Originated, Year Five 279   279   321
Financing Receivable, Originated, More Than Five Years 1,750   1,750   8,295
Financing Receivable, Revolving 2,000   2,000   897
Financing Receivable, Revolving, Converted to Term Loan 89   89   0
Total 21,250   21,250   45,617
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 1,063   1,063   4,401
Financing Receivable, Originated, Year Two 15,527   15,527   33,194
Financing Receivable, Originated, Year Three 46,749   46,749   1,716
Financing Receivable, Originated, Year Four 5,200   5,200   27
Financing Receivable, Originated, Year Five 1,193   1,193   0
Financing Receivable, Originated, More Than Five Years 6,523   6,523   0
Financing Receivable, Revolving 9,474   9,474   31,992
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 85,729   85,729   71,330
Performing [Member] | Commercial real estate [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 207,236   207,236   396,891
Financing Receivable, Originated, Year Two 483,818   483,818   1,941,913
Financing Receivable, Originated, Year Three 2,124,731   2,124,731   1,194,759
Financing Receivable, Originated, Year Four 877,950   877,950   416,647
Financing Receivable, Originated, Year Five 305,372   305,372   513,555
Financing Receivable, Originated, More Than Five Years 922,524   922,524   705,092
Financing Receivable, Revolving 138,517   138,517   136,095
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 5,060,148   5,060,148   5,304,952
Performing [Member] | Commercial real estate [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 352   352   476
Financing Receivable, Originated, Year Three 14,907   14,907   0
Financing Receivable, Originated, Year Four 32,131   32,131   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 0   0   19,171
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 47,390   47,390   19,647
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   2,992
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 37,158   37,158   3
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 31,595   31,595   2,733
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 68,753   68,753   5,728
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 384,583   384,583   426,089
Financing Receivable, Originated, Year Two 365,415   365,415   320,733
Financing Receivable, Originated, Year Three 298,108   298,108   342,927
Financing Receivable, Originated, Year Four 326,216   326,216   349,742
Financing Receivable, Originated, Year Five 321,928   321,928   54,801
Financing Receivable, Originated, More Than Five Years 251,578   251,578   243,356
Financing Receivable, Revolving 383,530   383,530   375,739
Financing Receivable, Revolving, Converted to Term Loan 22,040   22,040   23,895
Total 2,353,398   2,353,398   2,137,282
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 54   54   157
Financing Receivable, Originated, Year Two 246   246   140
Financing Receivable, Originated, Year Three 69   69   131
Financing Receivable, Originated, Year Four 158   158   1,361
Financing Receivable, Originated, Year Five 0   0   18
Financing Receivable, Originated, More Than Five Years 85   85   134
Financing Receivable, Revolving 1,424   1,424   2,982
Financing Receivable, Revolving, Converted to Term Loan 0   0   93
Total 2,036   2,036   5,016
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 91   91   0
Financing Receivable, Originated, Year Two 0   0   150
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   37
Financing Receivable, Originated, More Than Five Years 31   31   49
Financing Receivable, Revolving 1,049   1,049   50
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 1,171   1,171   286
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   633
Financing Receivable, Originated, Year Two 1,997   1,997   1,788
Financing Receivable, Originated, Year Three 2,925   2,925   2,220
Financing Receivable, Originated, Year Four 2,456   2,456   4,297
Financing Receivable, Originated, Year Five 3,486   3,486   6,441
Financing Receivable, Originated, More Than Five Years 110,363   110,363   124,719
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 121,227   121,227   140,098
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 195,101   195,101   218,401
Financing Receivable, Originated, Year Two 168,303   168,303   229,580
Financing Receivable, Originated, Year Three 161,189   161,189   149,291
Financing Receivable, Originated, Year Four 123,890   123,890   136,215
Financing Receivable, Originated, Year Five 108,652   108,652   75,348
Financing Receivable, Originated, More Than Five Years 163,097   163,097   137,629
Financing Receivable, Revolving 497,801   497,801   503,841
Financing Receivable, Revolving, Converted to Term Loan 86   86   145
Total 1,418,119   1,418,119   1,450,450
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 13   13   66
Financing Receivable, Originated, Year Two 0   0   39
Financing Receivable, Originated, Year Three 54   54   106
Financing Receivable, Originated, Year Four 24   24   30
Financing Receivable, Originated, Year Five 1   1   8
Financing Receivable, Originated, More Than Five Years 8   8   0
Financing Receivable, Revolving 0   0   1,918
Financing Receivable, Revolving, Converted to Term Loan 0   0   3
Total 100   100   2,170
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   64
Financing Receivable, Originated, Year Three 0   0   12
Financing Receivable, Originated, Year Four 25   25   9
Financing Receivable, Originated, Year Five 2   2   144
Financing Receivable, Originated, More Than Five Years 137   137   0
Financing Receivable, Revolving 1,990   1,990   3
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 2,154   2,154   232
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 104   104   0
Financing Receivable, Originated, Year Four 2,094   2,094   30,290
Financing Receivable, Originated, Year Five 0   0   23,129
Financing Receivable, Originated, More Than Five Years 13,729   13,729   28,110
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 15,927   15,927   81,529
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 0   0   1,635
Financing Receivable, Originated, Year Four 0   0   338
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 0   0   0
Financing Receivable, Revolving 1,425   1,425   1,643
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 1,425   1,425   3,616
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 70   70   99
Financing Receivable, Revolving 28,916   28,916   17,744
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 28,986   28,986   17,843
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 168   168   0
Financing Receivable, Originated, Year Two 0   0   1,134
Financing Receivable, Originated, Year Three 994   994   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   0
Financing Receivable, Originated, More Than Five Years 30   30   48
Financing Receivable, Revolving 4,084   4,084   5,956
Financing Receivable, Revolving, Converted to Term Loan 58   58   5
Total 5,334   5,334   7,143
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 2,416   2,416   0
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   0
Financing Receivable, Originated, Year Five 0   0   7,170
Financing Receivable, Originated, More Than Five Years 9,948   9,948   150
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 12,364   12,364   7,320
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   79
Financing Receivable, Originated, Year Two 464   464   1,419
Financing Receivable, Originated, Year Three 490   490   237
Financing Receivable, Originated, Year Four 432   432   544
Financing Receivable, Originated, Year Five 531   531   344
Financing Receivable, Originated, More Than Five Years 8,435   8,435   12,381
Financing Receivable, Revolving 2,776   2,776   2,387
Financing Receivable, Revolving, Converted to Term Loan 560   560   665
Total 13,688   13,688   18,056
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   0
Financing Receivable, Originated, Year Two 0   0   0
Financing Receivable, Originated, Year Three 0   0   0
Financing Receivable, Originated, Year Four 0   0   280
Financing Receivable, Originated, Year Five 280   280   375
Financing Receivable, Originated, More Than Five Years 6,240   6,240   9,054
Financing Receivable, Revolving 0   0   0
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total 6,520   6,520   9,709
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccrual [Member]          
Financing Receivable, Credit Quality Indicator Line Items [Abstract]          
Financing Receivable, Originated, Year One 0   0   4
Financing Receivable, Originated, Year Two 6   6   51
Financing Receivable, Originated, Year Three 21   21   9
Financing Receivable, Originated, Year Four 7   7   16
Financing Receivable, Originated, Year Five 5   5   3
Financing Receivable, Originated, More Than Five Years 8   8   12
Financing Receivable, Revolving 24   24   158
Financing Receivable, Revolving, Converted to Term Loan 0   0   0
Total $ 71   $ 71   $ 253
[1] Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.
[2] Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.