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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One $ 1,281,763 $ 4,855,463
Financing Receivable, Originated, Year Two 4,485,179 3,161,473
Financing Receivable, Originated, Year Three 3,046,366 2,651,833
Financing Receivable, Originated, Year Four 2,353,485 1,788,880
Financing Receivable, Originated, Year Five 1,645,058 1,356,476
Financing Receivable, Originated, More Than Five Years 4,060,444 3,054,469
Financing Receivable, Revolving 5,632,687 6,108,767
Financing Receivable, Revolving, Converted to Term Loan 28,865 30,159
Total 22,533,847 23,007,520
Commercial [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 495,201 1,657,760
Financing Receivable, Originated, Year Two 1,609,600 1,557,142
Financing Receivable, Originated, Year Three 1,477,237 1,461,282
Financing Receivable, Originated, Year Four 1,340,841 1,013,619
Financing Receivable, Originated, Year Five 948,479 747,318
Financing Receivable, Originated, More Than Five Years 2,162,219 1,603,533
Financing Receivable, Revolving 4,621,212 5,033,683
Financing Receivable, Revolving, Converted to Term Loan 2,995 3,198
Total 12,657,784 13,077,535
Commercial [Member] | Energy [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 80,102 157,690
Financing Receivable, Originated, Year Two 126,717 55,833
Financing Receivable, Originated, Year Three 55,688 90,799
Financing Receivable, Originated, Year Four 80,149 7,178
Financing Receivable, Originated, Year Five 6,731 13,815
Financing Receivable, Originated, More Than Five Years 33,281 29,020
Financing Receivable, Revolving 2,819,820 3,114,859
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,202,488 3,469,194
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 114,646 536,745
Financing Receivable, Originated, Year Two 570,755 642,739
Financing Receivable, Originated, Year Three 645,309 639,676
Financing Receivable, Originated, Year Four 616,403 423,763
Financing Receivable, Originated, Year Five 394,541 234,531
Financing Receivable, Originated, More Than Five Years 794,617 680,890
Financing Receivable, Revolving 154,487 147,646
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,290,758 3,305,990
Commercial [Member] | Services [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 182,186 540,265
Financing Receivable, Originated, Year Two 547,870 452,269
Financing Receivable, Originated, Year Three 394,254 399,264
Financing Receivable, Originated, Year Four 347,450 326,282
Financing Receivable, Originated, Year Five 320,352 381,902
Financing Receivable, Originated, More Than Five Years 1,023,831 700,028
Financing Receivable, Revolving 605,378 707,891
Financing Receivable, Revolving, Converted to Term Loan 627 682
Total 3,421,948 3,508,583
Commercial [Member] | General business [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 118,267 423,060
Financing Receivable, Originated, Year Two 364,258 406,301
Financing Receivable, Originated, Year Three 381,986 331,543
Financing Receivable, Originated, Year Four 296,839 256,396
Financing Receivable, Originated, Year Five 226,855 117,070
Financing Receivable, Originated, More Than Five Years 310,490 193,595
Financing Receivable, Revolving 1,041,527 1,063,287
Financing Receivable, Revolving, Converted to Term Loan 2,368 2,516
Total 2,742,590 2,793,768
Commercial real estate [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 73,306 725,577
Financing Receivable, Originated, Year Two 812,635 1,219,638
Financing Receivable, Originated, Year Three 1,224,195 954,485
Financing Receivable, Originated, Year Four 799,248 506,146
Financing Receivable, Originated, Year Five 448,630 325,092
Financing Receivable, Originated, More Than Five Years 981,532 744,404
Financing Receivable, Revolving 163,764 223,158
Financing Receivable, Revolving, Converted to Term Loan 37 38
Total 4,503,347 4,698,538
Paycheck Protection Program [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 544,128 1,682,310
Financing Receivable, Originated, Year Two 1,304,422 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 1,848,550 1,682,310
Loans to individuals [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 169,128 789,816
Financing Receivable, Originated, Year Two 758,522 384,693
Financing Receivable, Originated, Year Three 344,934 236,066
Financing Receivable, Originated, Year Four 213,396 269,115
Financing Receivable, Originated, Year Five 247,949 284,066
Financing Receivable, Originated, More Than Five Years 916,693 706,532
Financing Receivable, Revolving 847,711 851,926
Financing Receivable, Revolving, Converted to Term Loan 25,833 26,923
Total 3,524,166 3,549,137
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 124,830 565,006
Financing Receivable, Originated, Year Two 535,429 149,947
Financing Receivable, Originated, Year Three 119,990 124,678
Financing Receivable, Originated, Year Four 104,023 125,714
Financing Receivable, Originated, Year Five 104,373 160,870
Financing Receivable, Originated, More Than Five Years 461,434 371,059
Financing Receivable, Revolving 322,936 340,316
Financing Receivable, Revolving, Converted to Term Loan 24,463 25,413
Total 1,797,478 1,863,003
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 4,859
Financing Receivable, Originated, Year Two 7,101 33,880
Financing Receivable, Originated, Year Three 32,171 35,009
Financing Receivable, Originated, Year Four 36,062 43,099
Financing Receivable, Originated, Year Five 45,744 58,573
Financing Receivable, Originated, More Than Five Years 298,973 233,267
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 420,051 408,687
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 44,298 219,951
Financing Receivable, Originated, Year Two 215,992 200,866
Financing Receivable, Originated, Year Three 192,773 76,379
Financing Receivable, Originated, Year Four 73,311 100,302
Financing Receivable, Originated, Year Five 97,832 64,623
Financing Receivable, Originated, More Than Five Years 156,286 102,206
Financing Receivable, Revolving 524,775 511,610
Financing Receivable, Revolving, Converted to Term Loan 1,370 1,510
Total 1,306,637 1,277,447
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 63,102 112,614
Financing Receivable, Originated, Year Two 81,658 51,863
Financing Receivable, Originated, Year Three 51,881 89,346
Financing Receivable, Originated, Year Four 78,812 7,178
Financing Receivable, Originated, Year Five 6,731 1,148
Financing Receivable, Originated, More Than Five Years 8,019 7,956
Financing Receivable, Revolving 2,388,115 2,548,663
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 2,678,318 2,818,768
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 17,000 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 144,976 202,590
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 161,976 202,590
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 24,000
Financing Receivable, Originated, Year Two 24,051 1,363
Financing Receivable, Originated, Year Three 1,319 1,453
Financing Receivable, Originated, Year Four 1,337 0
Financing Receivable, Originated, Year Five 0 12,667
Financing Receivable, Originated, More Than Five Years 11,922 0
Financing Receivable, Revolving 221,765 283,294
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 260,394 322,777
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 114,646 536,745
Financing Receivable, Originated, Year Two 570,755 615,221
Financing Receivable, Originated, Year Three 617,791 638,302
Financing Receivable, Originated, Year Four 615,371 422,834
Financing Receivable, Originated, Year Five 394,541 234,399
Financing Receivable, Originated, More Than Five Years 780,397 658,286
Financing Receivable, Revolving 153,973 147,132
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,247,474 3,252,919
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 27,500
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 504 8,282
Financing Receivable, Revolving 5 5
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 509 35,787
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 27,500 1,191
Financing Receivable, Originated, Year Four 1,032 929
Financing Receivable, Originated, Year Five 0 132
Financing Receivable, Originated, More Than Five Years 11,056 11,387
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 39,588 13,639
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 182,186 534,853
Financing Receivable, Originated, Year Two 542,579 436,384
Financing Receivable, Originated, Year Three 381,122 372,867
Financing Receivable, Originated, Year Four 327,241 307,374
Financing Receivable, Originated, Year Five 300,688 373,785
Financing Receivable, Originated, More Than Five Years 1,005,483 683,936
Financing Receivable, Revolving 574,095 665,491
Financing Receivable, Revolving, Converted to Term Loan 627 682
Total 3,314,021 3,375,372
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 150
Financing Receivable, Originated, Year Two 138 9,057
Financing Receivable, Originated, Year Three 1,446 389
Financing Receivable, Originated, Year Four 1,008 291
Financing Receivable, Originated, Year Five 7 2,038
Financing Receivable, Originated, More Than Five Years 1,844 2,000
Financing Receivable, Revolving 1,971 3,063
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 6,414 16,988
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 429
Financing Receivable, Originated, Year Two 421 6,380
Financing Receivable, Originated, Year Three 11,238 26,008
Financing Receivable, Originated, Year Four 18,435 6,027
Financing Receivable, Originated, Year Five 5,288 5,030
Financing Receivable, Originated, More Than Five Years 9,471 7,954
Financing Receivable, Revolving 28,627 38,797
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 73,480 90,625
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 118,267 419,756
Financing Receivable, Originated, Year Two 361,002 394,985
Financing Receivable, Originated, Year Three 370,674 310,273
Financing Receivable, Originated, Year Four 274,644 236,222
Financing Receivable, Originated, Year Five 209,218 103,987
Financing Receivable, Originated, More Than Five Years 297,857 186,600
Financing Receivable, Revolving 1,032,658 1,055,878
Financing Receivable, Revolving, Converted to Term Loan 2,305 2,316
Total 2,666,625 2,710,017
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 197
Financing Receivable, Originated, Year Two 189 4,519
Financing Receivable, Originated, Year Three 4,850 9,713
Financing Receivable, Originated, Year Four 3,401 7,803
Financing Receivable, Originated, Year Five 7,469 2,511
Financing Receivable, Originated, More Than Five Years 1,781 3,159
Financing Receivable, Revolving 4,903 2,483
Financing Receivable, Revolving, Converted to Term Loan 0 19
Total 22,593 30,404
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 1,432
Financing Receivable, Originated, Year Two 1,392 3,069
Financing Receivable, Originated, Year Three 2,575 6,694
Financing Receivable, Originated, Year Four 12,901 10,935
Financing Receivable, Originated, Year Five 8,738 10,042
Financing Receivable, Originated, More Than Five Years 10,287 3,729
Financing Receivable, Revolving 3,408 4,449
Financing Receivable, Revolving, Converted to Term Loan 18 140
Total 39,319 40,490
Performing [Member] | Commercial real estate [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 73,306 725,577
Financing Receivable, Originated, Year Two 812,635 1,211,338
Financing Receivable, Originated, Year Three 1,215,895 954,226
Financing Receivable, Originated, Year Four 796,047 489,193
Financing Receivable, Originated, Year Five 430,066 314,899
Financing Receivable, Originated, More Than Five Years 951,180 722,475
Financing Receivable, Revolving 163,737 223,131
Financing Receivable, Revolving, Converted to Term Loan 37 38
Total 4,442,903 4,640,877
Performing [Member] | Commercial real estate [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 259
Financing Receivable, Originated, Year Four 3,201 12,311
Financing Receivable, Originated, Year Five 14,110 2,725
Financing Receivable, Originated, More Than Five Years 6,900 5,831
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 24,211 21,126
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 4,410
Financing Receivable, Originated, Year Five 4,454 0
Financing Receivable, Originated, More Than Five Years 4,509 4,852
Financing Receivable, Revolving 27 27
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 8,990 9,289
Performing [Member] | Paycheck Protection Program [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 544,128 1,682,310
Financing Receivable, Originated, Year Two 1,304,422 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 1,848,550 1,682,310
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 124,830 564,325
Financing Receivable, Originated, Year Two 534,781 149,832
Financing Receivable, Originated, Year Three 119,866 120,875
Financing Receivable, Originated, Year Four 100,259 124,930
Financing Receivable, Originated, Year Five 103,645 158,801
Financing Receivable, Originated, More Than Five Years 433,347 348,292
Financing Receivable, Revolving 318,319 335,259
Financing Receivable, Revolving, Converted to Term Loan 23,567 24,553
Total 1,758,614 1,826,867
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 0 33
Financing Receivable, Originated, Year Two 22 11
Financing Receivable, Originated, Year Three 0 2,094
Financing Receivable, Originated, Year Four 1,851 0
Financing Receivable, Originated, Year Five 0 59
Financing Receivable, Originated, More Than Five Years 3,429 318
Financing Receivable, Revolving 204 950
Financing Receivable, Revolving, Converted to Term Loan 74 10
Total 5,580 3,475
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 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 51
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 34
Financing Receivable, Revolving 400 272
Financing Receivable, Revolving, Converted to Term Loan 0 76
Total 400 433
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 4,859
Financing Receivable, Originated, Year Two 7,101 33,880
Financing Receivable, Originated, Year Three 32,171 34,464
Financing Receivable, Originated, Year Four 35,189 43,099
Financing Receivable, Originated, Year Five 45,744 58,264
Financing Receivable, Originated, More Than Five Years 291,282 226,380
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 411,487 400,946
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 44,298 219,873
Financing Receivable, Originated, Year Two 215,962 200,580
Financing Receivable, Originated, Year Three 192,533 76,246
Financing Receivable, Originated, Year Four 73,230 100,229
Financing Receivable, Originated, Year Five 97,757 64,104
Financing Receivable, Originated, More Than Five Years 155,714 102,126
Financing Receivable, Revolving 524,716 510,571
Financing Receivable, Revolving, Converted to Term Loan 1,370 1,510
Total 1,305,580 1,275,239
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 39
Financing Receivable, Originated, Year Two 28 55
Financing Receivable, Originated, Year Three 14 66
Financing Receivable, Originated, Year Four 21 0
Financing Receivable, Originated, Year Five 2 469
Financing Receivable, Originated, More Than Five Years 474 31
Financing Receivable, Revolving 12 965
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 551 1,625
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 11
Financing Receivable, Originated, Year Two 0 214
Financing Receivable, Originated, Year Three 215 10
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 17 0
Financing Receivable, Revolving 19 29
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 251 264
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 21,076
Financing Receivable, Originated, Year Two 21,008 2,607
Financing Receivable, Originated, Year Three 2,488 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 13,340 21,064
Financing Receivable, Revolving 64,964 80,312
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 101,800 125,059
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
Financing Receivable, Originated, Year Two 0 18
Financing Receivable, Originated, Year Three 18 183
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 2,660 2,935
Financing Receivable, Revolving 509 509
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,187 3,645
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 4,833
Financing Receivable, Originated, Year Two 4,732 448
Financing Receivable, Originated, Year Three 448 0
Financing Receivable, Originated, Year Four 766 12,590
Financing Receivable, Originated, Year Five 14,369 1,049
Financing Receivable, Originated, More Than Five Years 7,033 6,138
Financing Receivable, Revolving 685 540
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 28,033 25,598
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 1,675
Financing Receivable, Originated, Year Two 1,675 3,728
Financing Receivable, Originated, Year Three 3,887 4,863
Financing Receivable, Originated, Year Four 5,893 1,436
Financing Receivable, Originated, Year Five 1,430 530
Financing Receivable, Originated, More Than Five Years 565 107
Financing Receivable, Revolving 558 477
Financing Receivable, Revolving, Converted to Term Loan 45 41
Total 14,053 12,857
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
Financing Receivable, Originated, Year Two 0 8,300
Financing Receivable, Originated, Year Three 8,300 0
Financing Receivable, Originated, Year Four 0 232
Financing Receivable, Originated, Year Five 0 7,468
Financing Receivable, Originated, More Than Five Years 18,943 11,246
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 27,243 27,246
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 0 648
Financing Receivable, Originated, Year Two 626 104
Financing Receivable, Originated, Year Three 124 1,658
Financing Receivable, Originated, Year Four 1,913 784
Financing Receivable, Originated, Year Five 728 2,010
Financing Receivable, Originated, More Than Five Years 24,658 22,415
Financing Receivable, Revolving 4,013 3,835
Financing Receivable, Revolving, Converted to Term Loan 822 774
Total 32,884 32,228
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
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 545
Financing Receivable, Originated, Year Four 873 0
Financing Receivable, Originated, Year Five 0 309
Financing Receivable, Originated, More Than Five Years 7,691 6,887
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 8,564 7,741
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 28
Financing Receivable, Originated, Year Two 2 17
Financing Receivable, Originated, Year Three 11 57
Financing Receivable, Originated, Year Four 60 73
Financing Receivable, Originated, Year Five 73 50
Financing Receivable, Originated, More Than Five Years 81 49
Financing Receivable, Revolving 28 45
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total $ 255 $ 319