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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One $ 817,517     $ 3,279,975
Financing Receivable, Originated, Year Two 3,094,916     2,873,863
Financing Receivable, Originated, Year Three 2,765,385     4,270,179
Financing Receivable, Originated, Year Four 4,172,820     2,359,227
Financing Receivable, Originated, Year Five 2,239,089     1,369,849
Financing Receivable, Originated, More Than Five Years 4,140,233     2,993,779
Financing Receivable, Revolving 6,429,638     6,938,929
Financing Receivable, Revolving, Converted to Term Loan 30,890     28,923
Loans 23,690,488     24,114,724
Financing Receivable, Allowance for Credit Loss, Writeoff 2,291 $ 7,060    
Commercial [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 582,744     2,067,074
Financing Receivable, Originated, Year Two 1,841,365     1,866,895
Financing Receivable, Originated, Year Three 1,730,326     1,751,617
Financing Receivable, Originated, Year Four 1,688,132     1,095,279
Financing Receivable, Originated, Year Five 1,014,746     709,743
Financing Receivable, Originated, More Than Five Years 2,150,672     1,653,117
Financing Receivable, Revolving 5,392,455     5,883,625
Financing Receivable, Revolving, Converted to Term Loan 2,991     2,786
Loans 14,403,431     15,030,136
Financing Receivable, Allowance for Credit Loss, Writeoff 1,085 4,240    
Commercial [Member] | Healthcare [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 150,623     539,305
Financing Receivable Year One Originated Current Fiscal Year Writeoff     $ 0  
Financing Receivable, Originated, Year Two 538,884     597,283
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, Year Three 523,393     966,286
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, Year Four 935,156     497,918
Financing Receivable, Originated, Year Four     0  
Financing Receivable, Originated, Year Five 447,629     395,743
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, More Than Five Years 961,521     719,305
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     7,240  
Financing Receivable, Revolving 232,231     251,683
Financing Receivable Revolving Writeoff     0  
Financing Receivable, Revolving, Converted to Term Loan 9     10
Financing Receivable Revolving Converted to Term Writeoff     0  
Loans 3,789,446     3,967,533
Financing Receivable, Allowance for Credit Loss, Writeoff     7,240  
Commercial [Member] | Services [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 111,675     629,978
Financing Receivable Year One Originated Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Two 575,705     629,968
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Three 637,057     431,168
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Four 427,689     406,506
Financing Receivable, Originated, Year Four 0   0  
Financing Receivable, Originated, Year Five 395,677     188,541
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff 0   22  
Financing Receivable, Originated, More Than Five Years 766,282     590,321
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff 0   80  
Financing Receivable, Revolving 789,935     765,942
Financing Receivable Revolving Writeoff 491   9  
Financing Receivable, Revolving, Converted to Term Loan 814     779
Financing Receivable Revolving Converted to Term Writeoff 0   0  
Loans 3,704,834     3,643,203
Financing Receivable, Allowance for Credit Loss, Writeoff 491   111  
Commercial [Member] | Energy [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 73,695     148,972
Financing Receivable Year One Originated Current Fiscal Year Writeoff 0     0
Financing Receivable, Originated, Year Two 107,688     46,094
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff 0     0
Financing Receivable, Originated, Year Three 41,449     39,050
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff 0     0
Financing Receivable, Originated, Year Four 29,086     2,621
Financing Receivable, Originated, Year Four 0     0
Financing Receivable, Originated, Year Five 2,560     6,488
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff 0     0
Financing Receivable, Originated, More Than Five Years 30,344     17,038
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff 0     0
Financing Receivable, Revolving 2,575,508     2,994,461
Financing Receivable Revolving Writeoff 94     226
Financing Receivable, Revolving, Converted to Term Loan 0     0
Financing Receivable Revolving Converted to Term Writeoff 0     0
Loans 2,860,330     3,254,724
Financing Receivable, Allowance for Credit Loss, Writeoff 94     226
Commercial [Member] | General business [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 246,751     748,819
Financing Receivable Year One Originated Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Two 619,088     593,550
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff 0   27  
Financing Receivable, Originated, Year Three 528,427     315,113
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff 132   1,465  
Financing Receivable, Originated, Year Four 296,201     188,234
Financing Receivable, Originated, Year Four 0   0  
Financing Receivable, Originated, Year Five 168,880     118,971
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, More Than Five Years 392,525     326,453
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff 0   166  
Financing Receivable, Revolving 1,794,781     1,871,539
Financing Receivable Revolving Writeoff 368   2,425  
Financing Receivable, Revolving, Converted to Term Loan 2,168     1,997
Financing Receivable Revolving Converted to Term Writeoff 0   103  
Loans 4,048,821     4,164,676
Financing Receivable, Allowance for Credit Loss, Writeoff 500   4,186  
Commercial real estate [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 96,485     436,206
Financing Receivable Year One Originated Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, Year Two 525,908     512,927
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, Year Three 529,943     2,056,446
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, Year Four 2,025,294     825,292
Financing Receivable, Originated, Year Four     0  
Financing Receivable, Originated, Year Five 797,384     233,619
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff     0  
Financing Receivable, Originated, More Than Five Years 1,077,488     852,655
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff     1,455  
Financing Receivable, Revolving 111,034     141,307
Financing Receivable Revolving Writeoff     0  
Financing Receivable, Revolving, Converted to Term Loan 0     0
Financing Receivable Revolving Converted to Term Writeoff     0  
Loans 5,163,536     5,058,452
Financing Receivable, Allowance for Credit Loss, Writeoff 0 1,250 1,455  
Loans to individuals [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 138,288     776,695
Financing Receivable, Originated, Year Two 727,643     494,041
Financing Receivable, Originated, Year Three 505,116     462,116
Financing Receivable, Originated, Year Four 459,394     438,656
Financing Receivable, Originated, Year Five 426,959     426,487
Financing Receivable, Originated, More Than Five Years 912,073     488,007
Financing Receivable, Revolving 926,149     913,997
Financing Receivable, Revolving, Converted to Term Loan 27,899     26,137
Loans 4,123,521     4,026,136
Financing Receivable, Allowance for Credit Loss, Writeoff 1,206 $ 1,570    
Loans to individuals [Member] | Residential mortgage [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 97,566     530,431
Financing Receivable Year One Originated Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Two 480,969     340,112
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff 0   43  
Financing Receivable, Originated, Year Three 328,116     288,166
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, Year Four 280,586     319,676
Financing Receivable, Originated, Year Four 0   0  
Financing Receivable, Originated, Year Five 311,262     315,397
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff 0   0  
Financing Receivable, Originated, More Than Five Years 544,645     217,829
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff 0   18  
Financing Receivable, Revolving 400,751     401,829
Financing Receivable Revolving Writeoff 92   10  
Financing Receivable, Revolving, Converted to Term Loan 27,450     23,518
Financing Receivable Revolving Converted to Term Writeoff 0   0  
Loans 2,471,345     2,436,958
Financing Receivable, Allowance for Credit Loss, Writeoff 92   71  
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     462
Financing Receivable, Originated, Year Two 1,079     4,337
Financing Receivable, Originated, Year Three 4,444     6,618
Financing Receivable, Originated, Year Four 7,977     2,432
Financing Receivable, Originated, Year Five 2,495     3,786
Financing Receivable, Originated, More Than Five Years 117,458     119,014
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 133,453     136,649
Loans to individuals [Member] | Personal [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 40,722     245,802
Financing Receivable Year One Originated Current Fiscal Year Writeoff 1,036 [1]   5,269 [2]  
Financing Receivable, Originated, Year Two 245,595     149,592
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff 50 [1]   69 [2]  
Financing Receivable, Originated, Year Three 172,556     167,332
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff 0 [1]   101 [2]  
Financing Receivable, Originated, Year Four 170,831     116,548
Financing Receivable, Originated, Year Four 0 [1]   52 [2]  
Financing Receivable, Originated, Year Five 113,202     107,304
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff 0 [1]   9 [2]  
Financing Receivable, Originated, More Than Five Years 249,970     151,164
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff 5 [1]   0 [2]  
Financing Receivable, Revolving 525,398     512,168
Financing Receivable Revolving Writeoff 23 [1]   26 [2]  
Financing Receivable, Revolving, Converted to Term Loan 449     2,619
Financing Receivable Revolving Converted to Term Writeoff 0 [1]   20 [2]  
Loans 1,518,723     1,452,529
Financing Receivable, Allowance for Credit Loss, Writeoff 1,114 [1]   $ 5,546 [2]  
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 150,623     539,305
Financing Receivable, Originated, Year Two 538,884     544,103
Financing Receivable, Originated, Year Three 454,541     896,042
Financing Receivable, Originated, Year Four 865,217     481,816
Financing Receivable, Originated, Year Five 431,766     344,609
Financing Receivable, Originated, More Than Five Years 846,283     644,441
Financing Receivable, Revolving 230,867     249,793
Financing Receivable, Revolving, Converted to Term Loan 9     10
Loans 3,518,190     3,700,119
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     15,000
Financing Receivable, Originated, Year Three 15,000     64,895
Financing Receivable, Originated, Year Four 64,641     110
Financing Receivable, Originated, Year Five 107     0
Financing Receivable, Originated, More Than Five Years 3,368     32,555
Financing Receivable, Revolving 254     255
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 83,370     112,815
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     38,180
Financing Receivable, Originated, Year Three 37,969     5,253
Financing Receivable, Originated, Year Four 5,171     15,529
Financing Receivable, Originated, Year Five 15,302     51,134
Financing Receivable, Originated, More Than Five Years 99,276     29,151
Financing Receivable, Revolving 915     1,635
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 158,633     140,882
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 111,675     629,978
Financing Receivable, Originated, Year Two 575,464     625,969
Financing Receivable, Originated, Year Three 631,261     422,015
Financing Receivable, Originated, Year Four 424,323     404,949
Financing Receivable, Originated, Year Five 393,206     187,324
Financing Receivable, Originated, More Than Five Years 740,756     570,775
Financing Receivable, Revolving 773,337     745,853
Financing Receivable, Revolving, Converted to Term Loan 427     379
Loans 3,650,449     3,587,242
Performing [Member] | Commercial [Member] | Services [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     3,324
Financing Receivable, Originated, Year Three 3,592     123
Financing Receivable, Originated, Year Four 0     1,537
Financing Receivable, Originated, Year Five 947     0
Financing Receivable, Originated, More Than Five Years 12,348     11,796
Financing Receivable, Revolving 4,022     17,923
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 20,909     34,703
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 0     0
Financing Receivable, Originated, Year Two 241     675
Financing Receivable, Originated, Year Three 2,152     9,030
Financing Receivable, Originated, Year Four 2,449     20
Financing Receivable, Originated, Year Five 1,311     1,217
Financing Receivable, Originated, More Than Five Years 13,018     7,750
Financing Receivable, Revolving 256     1,399
Financing Receivable, Revolving, Converted to Term Loan 387     400
Loans 19,814     20,491
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 73,695     148,972
Financing Receivable, Originated, Year Two 107,688     46,094
Financing Receivable, Originated, Year Three 41,449     39,050
Financing Receivable, Originated, Year Four 29,086     2,621
Financing Receivable, Originated, Year Five 2,560     6,488
Financing Receivable, Originated, More Than Five Years 30,295     16,989
Financing Receivable, Revolving 2,566,209     2,985,161
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 2,850,982     3,245,375
Performing [Member] | Commercial [Member] | Energy [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     0
Financing Receivable, Originated, Year Five 0     0
Financing Receivable, Originated, More Than Five Years 0     0
Financing Receivable, Revolving 9,299     9,300
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 9,299     9,300
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 246,193     740,440
Financing Receivable, Originated, Year Two 612,237     571,897
Financing Receivable, Originated, Year Three 512,552     267,528
Financing Receivable, Originated, Year Four 250,713     176,468
Financing Receivable, Originated, Year Five 166,324     117,755
Financing Receivable, Originated, More Than Five Years 385,834     319,986
Financing Receivable, Revolving 1,784,046     1,862,643
Financing Receivable, Revolving, Converted to Term Loan 2,122     1,938
Loans 3,960,021     4,058,655
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 0     4,399
Financing Receivable, Originated, Year Two 2,286     5,749
Financing Receivable, Originated, Year Three 4,571     4,285
Financing Receivable, Originated, Year Four 3,722     7,002
Financing Receivable, Originated, Year Five 260     224
Financing Receivable, Originated, More Than Five Years 0     1,736
Financing Receivable, Revolving 630     3,037
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 11,469     26,432
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 558     3,980
Financing Receivable, Originated, Year Two 4,565     15,872
Financing Receivable, Originated, Year Three 11,304     43,300
Financing Receivable, Originated, Year Four 41,766     4,764
Financing Receivable, Originated, Year Five 2,296     992
Financing Receivable, Originated, More Than Five Years 6,674     4,708
Financing Receivable, Revolving 10,065     5,859
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 77,228     79,475
Performing [Member] | Commercial real estate [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 96,485     436,206
Financing Receivable, Originated, Year Two 525,418     512,614
Financing Receivable, Originated, Year Three 529,670     2,004,558
Financing Receivable, Originated, Year Four 2,020,930     793,161
Financing Receivable, Originated, Year Five 784,480     233,619
Financing Receivable, Originated, More Than Five Years 1,026,071     810,497
Financing Receivable, Revolving 111,034     141,307
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 5,094,088     4,931,962
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     313
Financing Receivable, Originated, Year Three 273     14,907
Financing Receivable, Originated, Year Four 0     32,131
Financing Receivable, Originated, Year Five 12,904     0
Financing Receivable, Originated, More Than Five Years 9,401     0
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 22,578     47,351
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 490     0
Financing Receivable, Originated, Year Three 0     36,981
Financing Receivable, Originated, Year Four 1,092     0
Financing Receivable, Originated, Year Five 0     0
Financing Receivable, Originated, More Than Five Years 32,163     32,253
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 33,745     69,234
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 97,566     530,186
Financing Receivable, Originated, Year Two 480,639     338,187
Financing Receivable, Originated, Year Three 325,937     286,865
Financing Receivable, Originated, Year Four 278,335     318,935
Financing Receivable, Originated, Year Five 310,003     314,814
Financing Receivable, Originated, More Than Five Years 534,068     210,251
Financing Receivable, Revolving 394,986     395,943
Financing Receivable, Revolving, Converted to Term Loan 26,915     22,929
Loans 2,448,449     2,418,110
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     0
Financing Receivable, Originated, Year Two 90     167
Financing Receivable, Originated, Year Three 86     148
Financing Receivable, Originated, Year Four 319     219
Financing Receivable, Originated, Year Five 0     0
Financing Receivable, Originated, More Than Five Years 83     113
Financing Receivable, Revolving 1,314     1,767
Financing Receivable, Revolving, Converted to Term Loan 7     0
Loans 1,899     2,414
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     163
Financing Receivable, Originated, Year Four 0     0
Financing Receivable, Originated, Year Five 0     0
Financing Receivable, Originated, More Than Five Years 9     45
Financing Receivable, Revolving 486     898
Financing Receivable, Revolving, Converted to Term Loan 0     67
Loans 495     1,173
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     462
Financing Receivable, Originated, Year Two 1,079     4,337
Financing Receivable, Originated, Year Three 4,444     6,618
Financing Receivable, Originated, Year Four 7,977     2,432
Financing Receivable, Originated, Year Five 2,495     3,506
Financing Receivable, Originated, More Than Five Years 110,672     112,491
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 126,667     129,846
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]        
Financing Receivable, Credit Quality Indicator Line Items [Abstract]        
Financing Receivable, Originated, Year One 40,722     245,737
Financing Receivable, Originated, Year Two 245,553     149,572
Financing Receivable, Originated, Year Three 172,538     167,272
Financing Receivable, Originated, Year Four 170,792     115,710
Financing Receivable, Originated, Year Five 112,377     107,291
Financing Receivable, Originated, More Than Five Years 249,820     151,030
Financing Receivable, Revolving 525,396     510,147
Financing Receivable, Revolving, Converted to Term Loan 449     2,619
Loans 1,517,647     1,449,378
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     18
Financing Receivable, Originated, Year Two 40     17
Financing Receivable, Originated, Year Three 16     30
Financing Receivable, Originated, Year Four 14     825
Financing Receivable, Originated, Year Five 820     8
Financing Receivable, Originated, More Than Five Years 16     0
Financing Receivable, Revolving 0     8
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 906     906
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     16
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     1
Financing Receivable, Originated, More Than Five Years 129     129
Financing Receivable, Revolving 1     1,990
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 130     2,136
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     0
Financing Receivable, Originated, Year Three 15,883     96
Financing Receivable, Originated, Year Four 127     463
Financing Receivable, Originated, Year Five 454     0
Financing Receivable, Originated, More Than Five Years 12,594     13,158
Financing Receivable, Revolving 195     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 29,253     13,717
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
Financing Receivable, Originated, Year Two 0     0
Financing Receivable, Originated, Year Three 52     0
Financing Receivable, Originated, Year Four 917     0
Financing Receivable, Originated, Year Five 213     0
Financing Receivable, Originated, More Than Five Years 160     0
Financing Receivable, Revolving 12,320     767
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 13,662     767
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
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 49     49
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 49     49
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     0
Financing Receivable, Originated, Year Two 0     32
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 17     23
Financing Receivable, Revolving 40     0
Financing Receivable, Revolving, Converted to Term Loan 46     59
Loans 103     114
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     0
Financing Receivable, Originated, Year Three 0     0
Financing Receivable, Originated, Year Four 3,272     0
Financing Receivable, Originated, Year Five 0     0
Financing Receivable, Originated, More Than Five Years 9,853     9,905
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 13,125     9,905
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     245
Financing Receivable, Originated, Year Two 240     1,758
Financing Receivable, Originated, Year Three 2,093     990
Financing Receivable, Originated, Year Four 1,932     522
Financing Receivable, Originated, Year Five 1,259     583
Financing Receivable, Originated, More Than Five Years 10,485     7,420
Financing Receivable, Revolving 3,965     3,221
Financing Receivable, Revolving, Converted to Term Loan 528     522
Loans 20,502     15,261
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     0
Financing Receivable, Originated, Year Four 0     0
Financing Receivable, Originated, Year Five 0     280
Financing Receivable, Originated, More Than Five Years 6,786     6,523
Financing Receivable, Revolving 0     0
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans 6,786     6,803
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     31
Financing Receivable, Originated, Year Two 2     3
Financing Receivable, Originated, Year Three 2     30
Financing Receivable, Originated, Year Four 25     13
Financing Receivable, Originated, Year Five 5     4
Financing Receivable, Originated, More Than Five Years 5     5
Financing Receivable, Revolving 1     23
Financing Receivable, Revolving, Converted to Term Loan 0     0
Loans $ 40     $ 109
[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.