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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Total      
Current period gross charge-offs $ (8,202) $ (14,003)  
Current period recoveries 2,021 2,887  
Total net (charge-offs) recoveries 6,181 $ 11,116  
Portfolio Segment and Loan Class [Member]      
2021      
Total 1,101,369   $ 3,467,811
2020      
Total 2,888,374   1,732,931
2019      
Total 1,691,737   1,353,012
2018      
Total 1,313,252   1,234,058
2017      
Total 1,194,899   1,171,834
Prior      
Total 4,174,934   3,248,551
Revolving Loans Amortized Cost Basis      
Total 1,399,689   1,485,249
Total      
Total 13,764,575   13,694,790
Portfolio Segment and Loan Class [Member] | Pass      
2021      
Total 1,101,116   3,443,080
2020      
Total 2,852,081   1,655,148
2019      
Total 1,608,830   1,225,117
2018      
Total 1,179,939   1,090,130
2017      
Total 1,049,995   1,029,619
Prior      
Total 3,669,729   2,920,459
Revolving Loans Amortized Cost Basis      
Total 1,290,318   1,369,756
Total      
Total 12,752,329   12,733,713
Portfolio Segment and Loan Class [Member] | Special Mention      
2021      
Total 253   20,272
2020      
Total 32,418   64,708
2019      
Total 51,578   113,214
2018      
Total 109,137   91,650
2017      
Total 85,830   107,665
Prior      
Total 292,459   199,596
Revolving Loans Amortized Cost Basis      
Total 51,345   48,358
Total      
Total 623,020   645,463
Portfolio Segment and Loan Class [Member] | Substandard or Lower      
2021      
Total 0   4,459
2020      
Total 3,875   13,075
2019      
Total 31,329   14,681
2018      
Total 24,176   52,278
2017      
Total 59,074   34,550
Prior      
Total 212,746   128,496
Revolving Loans Amortized Cost Basis      
Total 58,026   67,135
Total      
Total 389,226   315,614
Portfolio Segment and Loan Class [Member] | Real estate - construction(1)      
2021      
Total 14,725   185,883
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2020      
Total 233,770   229,544
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2019      
Total 201,594   217,604
Current period gross charge-offs (39)   0
Current period recoveries 0   0
Total net (charge-offs) recoveries (39)   0
2018      
Total 218,467   83,086
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2017      
Total 82,662   45,776
Current period gross charge-offs 0   0
Current period recoveries 0   68
Total net (charge-offs) recoveries 0   68
Prior      
Total 159,054   118,319
Current period gross charge-offs 0   (17)
Current period recoveries 384   5,054
Total net (charge-offs) recoveries 384   5,037
Revolving Loans Amortized Cost Basis      
Total 36,452   38,658
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Total      
Total 946,724   918,870
Current period gross charge-offs (39)   (17)
Current period recoveries 384   5,122
Total net (charge-offs) recoveries (345)   (5,105)
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass      
2021      
Total 14,615   185,883
2020      
Total 233,770   229,097
2019      
Total 201,440   217,604
2018      
Total 218,467   81,086
2017      
Total 80,686   37,976
Prior      
Total 142,339   110,470
Revolving Loans Amortized Cost Basis      
Total 36,046   38,026
Total      
Total 927,363   900,142
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention      
2021      
Total 110   0
2020      
Total 0   0
2019      
Total 0   0
2018      
Total 0   0
2017      
Total 0   7,047
Prior      
Total 13,195   6,212
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 13,305   13,259
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower      
2021      
Total 0   0
2020      
Total 0   447
2019      
Total 154   0
2018      
Total 0   2,000
2017      
Total 1,976   753
Prior      
Total 3,520   1,637
Revolving Loans Amortized Cost Basis      
Total 406   632
Total      
Total 6,056   5,469
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1)      
2021      
Total 885,759   2,293,387
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2020      
Total 1,636,518   538,322
Current period gross charge-offs 0   (114)
Current period recoveries 0   43
Total net (charge-offs) recoveries 0   (71)
2019      
Total 509,154   336,168
Current period gross charge-offs (613)   (30)
Current period recoveries 37   486
Total net (charge-offs) recoveries (576)   456
2018      
Total 320,628   236,285
Current period gross charge-offs (2,871)   (488)
Current period recoveries 126   216
Total net (charge-offs) recoveries (2,745)   (272)
2017      
Total 222,961   231,247
Current period gross charge-offs (60)   (393)
Current period recoveries 36   162
Total net (charge-offs) recoveries (24)   (231)
Prior      
Total 792,647   646,458
Current period gross charge-offs (775)   (520)
Current period recoveries 570   4,531
Total net (charge-offs) recoveries (205)   4,011
Revolving Loans Amortized Cost Basis      
Total 1,308,047   1,388,961
Current period gross charge-offs 0   (17,370)
Current period recoveries 0   5,958
Total net (charge-offs) recoveries 0   (11,412)
Total      
Total 5,675,714   5,670,828
Current period gross charge-offs (4,319)   (18,915)
Current period recoveries 769   11,396
Total net (charge-offs) recoveries 3,550   7,519
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Pass      
2021      
Total 885,616   2,283,533
2020      
Total 1,624,535   508,541
2019      
Total 481,038   298,567
2018      
Total 290,788   214,089
2017      
Total 201,910   208,549
Prior      
Total 726,981   596,646
Revolving Loans Amortized Cost Basis      
Total 1,205,065   1,278,689
Total      
Total 5,415,933   5,388,614
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Special Mention      
2021      
Total 143   6,633
2020      
Total 9,136   23,834
2019      
Total 20,949   29,167
2018      
Total 16,337   10,945
2017      
Total 10,413   11,506
Prior      
Total 30,861   25,960
Revolving Loans Amortized Cost Basis      
Total 48,939   45,994
Total      
Total 136,778   154,039
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Substandard or Lower      
2021      
Total 0   3,221
2020      
Total 2,847   5,947
2019      
Total 7,167   8,434
2018      
Total 13,503   11,251
2017      
Total 10,638   11,192
Prior      
Total 34,805   23,852
Revolving Loans Amortized Cost Basis      
Total 54,043   64,278
Total      
Total 123,003   128,175
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage      
2021      
Total 200,885   988,541
Current period gross charge-offs 0   (60)
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   (60)
2020      
Total 1,018,086   965,065
Current period gross charge-offs 0   (21)
Current period recoveries 0   6
Total net (charge-offs) recoveries 0   (15)
2019      
Total 980,989   799,240
Current period gross charge-offs 0   (36)
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   (36)
2018      
Total 774,157   914,687
Current period gross charge-offs 0   (2,515)
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   (2,515)
2017      
Total 889,276   894,811
Current period gross charge-offs (1,719)   (29)
Current period recoveries 0   1
Total net (charge-offs) recoveries (1,719)   (28)
Prior      
Total 3,223,233   2,483,774
Current period gross charge-offs (118)   (1,547)
Current period recoveries 174   1,020
Total net (charge-offs) recoveries 56   (527)
Revolving Loans Amortized Cost Basis      
Total 55,190   57,630
Current period gross charge-offs 0   (17)
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   (17)
Total      
Total 7,142,137   7,105,092
Current period gross charge-offs (1,837)   (4,225)
Current period recoveries 174   1,027
Total net (charge-offs) recoveries 1,663   3,198
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass      
2021      
Total 200,885   973,664
2020      
Total 993,776   917,510
2019      
Total 926,352   708,946
2018      
Total 670,684   794,955
2017      
Total 767,399   783,094
Prior      
Total 2,800,409   2,213,343
Revolving Loans Amortized Cost Basis      
Total 49,207   53,041
Total      
Total 6,409,033   6,444,957
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention      
2021      
Total 0   13,639
2020      
Total 23,282   40,874
2019      
Total 30,629   84,047
2018      
Total 92,800   80,705
2017      
Total 75,417   89,112
Prior      
Total 248,403   167,424
Revolving Loans Amortized Cost Basis      
Total 2,406   2,364
Total      
Total 472,937   478,165
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower      
2021      
Total 0   1,238
2020      
Total 1,028   6,681
2019      
Total 24,008   6,247
2018      
Total 10,673   39,027
2017      
Total 46,460   22,605
Prior      
Total 174,421   103,007
Revolving Loans Amortized Cost Basis      
Total 3,577   2,225
Total      
Total 260,167   181,970
Payment Activity, Aging Status [Member]      
2021      
Total 434,428   1,600,529
2020      
Total 1,544,661   785,422
2019      
Total 682,336   397,005
2018      
Total 324,299   449,934
2017      
Total 381,851   319,307
Prior      
Total 847,173   627,069
Revolving Loans Amortized Cost Basis      
Total 1,006,611   1,044,502
Total      
Total 5,226,411   5,229,131
Payment Activity, Aging Status [Member] | Performing      
2021      
Total 434,428   1,600,144
2020      
Total 1,540,607   782,832
2019      
Total 680,193   393,651
2018      
Total 320,763   430,916
2017      
Total 362,707   318,108
Prior      
Total 819,988   602,764
Revolving Loans Amortized Cost Basis      
Total 997,016   1,034,983
Total      
Total 5,160,547   5,168,761
Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]      
2021      
Total 0   385
2020      
Total 4,054   2,590
2019      
Total 2,143   3,354
2018      
Total 3,536   19,018
2017      
Total 19,144   1,199
Prior      
Total 27,185   24,305
Revolving Loans Amortized Cost Basis      
Total 9,595   9,519
Total      
Total 65,864   60,370
Payment Activity, Aging Status [Member] | Real-estate - home equity      
2021      
Total 4,491   31,445
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2020      
Total 29,767   8,264
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2019      
Total 8,228   13,929
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2018      
Total 12,335   11,257
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2017      
Total 10,261   11,888
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Prior      
Total 121,634   129,039
Current period gross charge-offs 0   (34)
Current period recoveries 0   138
Total net (charge-offs) recoveries 0   104
Revolving Loans Amortized Cost Basis      
Total 958,190   991,770
Current period gross charge-offs (212)   (1,159)
Current period recoveries 51   366
Total net (charge-offs) recoveries (161)   (793)
Total      
Total 1,149,958   1,202,913
Current period gross charge-offs (212)   (1,193)
Current period recoveries 51   504
Total net (charge-offs) recoveries 161   689
Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing      
2021      
Total 4,491   31,445
2020      
Total 29,767   8,176
2019      
Total 8,140   13,906
2018      
Total 12,312   11,024
2017      
Total 9,997   11,667
Prior      
Total 119,037   126,749
Revolving Loans Amortized Cost Basis      
Total 948,645   982,285
Total      
Total 1,137,234   1,190,573
Payment Activity, Aging Status [Member] | Real-estate - home equity | Nonperforming Financial Instruments [Member]      
2021      
Total 0   0
2020      
Total 0   88
2019      
Total 88   23
2018      
Total 23   233
2017      
Total 264   221
Prior      
Total 2,597   2,290
Revolving Loans Amortized Cost Basis      
Total 9,545   9,485
Total      
Total 12,724   12,340
Payment Activity, Aging Status [Member] | Real estate - residential mortgage      
2021      
Total 358,906   1,255,749
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2020      
Total 1,244,373   588,361
Current period gross charge-offs 0   (68)
Current period recoveries 0   68
Total net (charge-offs) recoveries 0   0
2019      
Total 515,546   231,575
Current period gross charge-offs (40)   (101)
Current period recoveries 0   16
Total net (charge-offs) recoveries (40)   (85)
2018      
Total 184,959   344,046
Current period gross charge-offs (47)   (190)
Current period recoveries 3   1
Total net (charge-offs) recoveries (44)   (189)
2017      
Total 294,959   265,712
Current period gross charge-offs 0   (7)
Current period recoveries 1   1
Total net (charge-offs) recoveries 1   (6)
Prior      
Total 655,315   456,472
Current period gross charge-offs (105)   (254)
Current period recoveries 0   405
Total net (charge-offs) recoveries (105)   151
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 92   0
Total net (charge-offs) recoveries 92   0
Total      
Total 3,254,058   3,141,915
Current period gross charge-offs (192)   (620)
Current period recoveries 96   491
Total net (charge-offs) recoveries 96   129
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing      
2021      
Total 358,906   1,255,532
2020      
Total 1,240,446   585,878
2019      
Total 513,892   228,398
2018      
Total 181,509   341,563
2017      
Total 292,014   264,990
Prior      
Total 630,996   434,889
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 3,217,763   3,111,250
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Nonperforming Financial Instruments [Member]      
2021      
Total 0   217
2020      
Total 3,927   2,483
2019      
Total 1,654   3,177
2018      
Total 3,450   2,483
2017      
Total 2,945   722
Prior      
Total 24,319   21,583
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 36,295   30,665
Payment Activity, Aging Status [Member] | Consumer      
2021      
Total 27,910   114,567
Current period gross charge-offs 0   (134)
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   (134)
2020      
Total 104,051   98,606
Current period gross charge-offs (95)   (542)
Current period recoveries 33   64
Total net (charge-offs) recoveries (62)   (478)
2019      
Total 90,222   95,196
Current period gross charge-offs (94)   (524)
Current period recoveries 5   165
Total net (charge-offs) recoveries (89)   (359)
2018      
Total 85,900   43,475
Current period gross charge-offs (111)   (444)
Current period recoveries 11   159
Total net (charge-offs) recoveries (100)   (285)
2017      
Total 38,225   25,918
Current period gross charge-offs (79)   (489)
Current period recoveries 19   94
Total net (charge-offs) recoveries (60)   (395)
Prior      
Total 57,128   36,236
Current period gross charge-offs (229)   (769)
Current period recoveries 321   101
Total net (charge-offs) recoveries 92   (668)
Revolving Loans Amortized Cost Basis      
Total 48,421   52,732
Current period gross charge-offs (27)   (498)
Current period recoveries 0   1,292
Total net (charge-offs) recoveries (27)   794
Total      
Total 451,857   466,772
Current period gross charge-offs (635)   (3,400)
Current period recoveries 389   1,875
Total net (charge-offs) recoveries 246   1,525
Payment Activity, Aging Status [Member] | Consumer | Performing      
2021      
Total 27,910   114,399
2020      
Total 103,924   98,587
2019      
Total 90,185   95,072
2018      
Total 85,837   43,334
2017      
Total 38,190   25,804
Prior      
Total 56,885   36,086
Revolving Loans Amortized Cost Basis      
Total 48,371   52,698
Total      
Total 451,302   466,022
Payment Activity, Aging Status [Member] | Consumer | Nonperforming Financial Instruments [Member]      
2021      
Total 0   168
2020      
Total 127   19
2019      
Total 37   124
2018      
Total 63   141
2017      
Total 35   114
Prior      
Total 243   150
Revolving Loans Amortized Cost Basis      
Total 50   34
Total      
Total 555   750
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts      
2021      
Total 25,663   102,324
Current period gross charge-offs 0   (606)
Current period recoveries 0   185
Total net (charge-offs) recoveries 0   (421)
2020      
Total 68,641   65,303
Current period gross charge-offs (968)   (1,581)
Current period recoveries 120   349
Total net (charge-offs) recoveries (848)   (1,232)
2019      
Total 51,804   49,483
Current period gross charge-offs 0   0
Current period recoveries 39   21
Total net (charge-offs) recoveries 39   21
2018      
Total 36,350   50,978
Current period gross charge-offs 0   0
Current period recoveries 0   18
Total net (charge-offs) recoveries 0   18
2017      
Total 38,230   15,773
Current period gross charge-offs 0   0
Current period recoveries 0   11
Total net (charge-offs) recoveries 0   11
Prior      
Total 13,080   5,322
Current period gross charge-offs 0   0
Current period recoveries 0   21
Total net (charge-offs) recoveries 0   21
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Total      
Total 233,768   289,183
Current period gross charge-offs (968)   (2,187)
Current period recoveries 159   605
Total net (charge-offs) recoveries 809   1,582
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing      
2021      
Total 25,663   102,324
2020      
Total 68,641   65,303
2019      
Total 51,804   49,453
2018      
Total 36,350   34,995
2017      
Total 22,506   15,631
Prior      
Total 13,054   5,040
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 218,018   272,746
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Nonperforming Financial Instruments [Member]      
2021      
Total 0   0
2020      
Total 0   0
2019      
Total 0   30
2018      
Total 0   15,983
2017      
Total 15,724   142
Prior      
Total 26   282
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 15,750   16,437
Payment Activity, Aging Status [Member] | Construction - other      
2021      
Total 17,458   96,444
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2020      
Total 97,829   24,888
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2019      
Total 16,536   6,822
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2018      
Total 4,755   178
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
2017      
Total 176   16
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Prior      
Total 16   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Total      
Total 136,770   128,348
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Payment Activity, Aging Status [Member] | Construction - other | Performing      
2021      
Total 17,458   96,444
2020      
Total 97,829   24,888
2019      
Total 16,172   6,822
2018      
Total 4,755   0
2017      
Total 0   16
Prior      
Total 16   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 136,230   128,170
Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]      
2021      
Total 0   0
2020      
Total 0   0
2019      
Total 364   0
2018      
Total 0   178
2017      
Total 176   0
Prior      
Total 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 540   178
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member]      
Revolving Loans Amortized Cost Basis      
Total 321   1,344
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Pass      
Revolving Loans Amortized Cost Basis      
Total 321   404
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   940
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1)      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1)      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Pass      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage      
Revolving Loans Amortized Cost Basis      
Total 321   1,344
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass      
Revolving Loans Amortized Cost Basis      
Total 321   404
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   940
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member]      
Revolving Loans Amortized Cost Basis      
Total 5,052   5,363
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Performing      
Revolving Loans Amortized Cost Basis      
Total 4,845   5,363
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 207   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity      
Revolving Loans Amortized Cost Basis      
Total 5,052   5,321
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing      
Revolving Loans Amortized Cost Basis      
Total 4,845   5,321
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 207   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer      
Revolving Loans Amortized Cost Basis      
Total 0   42
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   42
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Current period recoveries 0   0
Total net (charge-offs) recoveries 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total $ 0   $ 0