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Loans and Allowance for Credit Losses (Loan Risk Ratings) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Credit quality categories      
Prior $ 1,541,278   $ 1,195,244
Year One 735,929   405,932
Year Two 1,047,708   764,538
Year Three 620,781   1,052,957
Year Four 476,641   634,525
Year Five 107,132   461,566
Revolving Loans 247,338   239,292
Revolving Converted to Term Loans 682   17,934
Total 4,777,489   4,771,988
Current period gross charge-offs      
Total gross charge-offs (726) $ (654)  
Loans Evaluated By Performing Status      
Credit quality categories      
Prior 0   0
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 6,800   7,099
Revolving Converted to Term Loans 0   0
Total 6,800   7,099
Current period gross charge-offs      
Gross charge-offs, prior 0   0
Gross charge-offs, Year One 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Five 0   0
Revolving Loans (242)   (584)
Revolving Converted to Term Loans 0   0
Total gross charge-offs (242)   (584)
Total loans by risk category      
Credit quality categories      
Prior 1,541,278   1,195,244
Year One 735,929   405,932
Year Two 1,047,708   764,538
Year Three 620,781   1,052,957
Year Four 476,641   634,525
Year Five 107,132   461,566
Revolving Loans 240,538   232,193
Revolving Converted to Term Loans 682   17,934
Total 4,770,689   4,764,889
Current period gross charge-offs      
Gross charge-offs, prior (142)   (1,342)
Gross charge-offs, Year One (34)   (23)
Gross charge-offs, Year Two (287)   (401)
Gross charge-offs, Year Three (17)   (1,820)
Gross charge-offs, Year Four 0   (246)
Gross charge-offs, Year Five 0   0
Revolving Loans (4)   (17)
Revolving Converted to Term Loans 0   0
Total gross charge-offs (484)   (3,849)
Pass      
Credit quality categories      
Prior 1,522,412   1,172,110
Year One 728,243   405,414
Year Two 1,025,993   757,185
Year Three 618,417   1,030,804
Year Four 476,641   632,577
Year Five 107,132   461,566
Revolving Loans 238,300   229,782
Revolving Converted to Term Loans 682   17,422
Total 4,717,820   4,706,860
Special mention      
Credit quality categories      
Prior 9,620   9,159
Year One 3,162   518
Year Two 19,791   2,964
Year Three 0   19,746
Year Four 0   0
Year Five 0   0
Revolving Loans 883   1,120
Revolving Converted to Term Loans 0   11
Total 33,456   33,518
Substandard      
Credit quality categories      
Prior 9,246   13,975
Year One 4,524   0
Year Two 1,924   4,389
Year Three 2,364   2,407
Year Four 0   1,948
Year Five 0   0
Revolving Loans 1,355   1,291
Revolving Converted to Term Loans 0   501
Total 19,413   24,511
Commercial real estate      
Credit quality categories      
Prior 1,096,158   837,589
Year One 422,468   297,098
Year Two 563,538   441,039
Year Three 252,723   554,682
Year Four 136,600   250,482
Year Five 45,532   136,891
Revolving Loans 27,088   25,941
Revolving Converted to Term Loans 0   14,084
Total 2,544,107   2,557,806
Current period gross charge-offs      
Gross charge-offs, prior 0   0
Gross charge-offs, Year One 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total gross charge-offs 0 0 0
Commercial real estate | Pass      
Credit quality categories      
Prior 1,086,053   822,391
Year One 416,624   297,098
Year Two 543,786   435,084
Year Three 252,723   534,936
Year Four 136,600   250,482
Year Five 45,532   136,891
Revolving Loans 26,176   24,966
Revolving Converted to Term Loans 0   14,084
Total 2,507,494   2,515,932
Commercial real estate | Special mention      
Credit quality categories      
Prior 7,435   7,514
Year One 2,945   0
Year Two 19,752   2,964
Year Three 0   19,746
Year Four 0   0
Year Five 0   0
Revolving Loans 355   417
Revolving Converted to Term Loans 0   0
Total 30,487   30,641
Commercial real estate | Substandard      
Credit quality categories      
Prior 2,670   7,684
Year One 2,899   0
Year Two 0   2,991
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 557   558
Revolving Converted to Term Loans 0   0
Total 6,126   11,233
Residential real estate      
Credit quality categories      
Prior 362,427   298,249
Year One 211,058   79,086
Year Two 290,645   213,280
Year Three 222,186   295,692
Year Four 102,520   221,638
Year Five 14,345   101,005
Revolving Loans 122,613   119,843
Revolving Converted to Term Loans 64   613
Total 1,325,858   1,329,406
Current period gross charge-offs      
Gross charge-offs, prior 0   (1)
Gross charge-offs, Year One 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total gross charge-offs 0 (1) (1)
Residential real estate | Pass      
Credit quality categories      
Prior 354,826   291,306
Year One 209,479   78,568
Year Two 290,361   211,938
Year Three 221,305   295,402
Year Four 102,520   220,753
Year Five 14,345   101,005
Revolving Loans 122,175   119,367
Revolving Converted to Term Loans 64   613
Total 1,315,075   1,318,952
Residential real estate | Special mention      
Credit quality categories      
Prior 2,020   1,529
Year One 0   518
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total 2,020   2,047
Residential real estate | Substandard      
Credit quality categories      
Prior 5,581   5,414
Year One 1,579   0
Year Two 284   1,342
Year Three 881   290
Year Four 0   885
Year Five 0   0
Revolving Loans 438   476
Revolving Converted to Term Loans 0   0
Total 8,763   8,407
Construction      
Credit quality categories      
Prior 37,413   32,244
Year One 8,457   8,191
Year Two 56,341   8,628
Year Three 59,151   56,685
Year Four 154,069   70,232
Year Five 24,141   131,383
Revolving Loans 26,459   26,785
Revolving Converted to Term Loans 187   1,851
Total 366,218   335,999
Current period gross charge-offs      
Gross charge-offs, prior 0   0
Gross charge-offs, Year One 0   0
Gross charge-offs, Year Two 0   (12)
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total gross charge-offs 0 (12) (12)
Construction | Pass      
Credit quality categories      
Prior 37,068   31,884
Year One 8,240   8,191
Year Two 56,341   8,628
Year Three 59,151   56,685
Year Four 154,069   70,232
Year Five 24,141   131,383
Revolving Loans 26,459   26,785
Revolving Converted to Term Loans 187   1,851
Total 365,656   335,639
Construction | Special mention      
Credit quality categories      
Prior 0   0
Year One 217   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total 217   0
Construction | Substandard      
Credit quality categories      
Prior 345   360
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total 345   360
Commercial      
Credit quality categories      
Prior 34,182   25,845
Year One 36,459   11,088
Year Two 27,993   40,825
Year Three 29,931   30,399
Year Four 36,469   29,958
Year Five 5,338   39,489
Revolving Loans 63,696   58,942
Revolving Converted to Term Loans 431   1,386
Total 234,499   237,932
Current period gross charge-offs      
Gross charge-offs, prior (2)   (54)
Gross charge-offs, Year One 0   (11)
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year Three 0   (56)
Gross charge-offs, Year Four 0   (69)
Gross charge-offs, Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total gross charge-offs (2) 0 (190)
Commercial | Pass      
Credit quality categories      
Prior 33,367   25,214
Year One 36,453   11,088
Year Two 26,437   40,817
Year Three 29,006   29,142
Year Four 36,469   29,458
Year Five 5,338   39,489
Revolving Loans 62,808   57,982
Revolving Converted to Term Loans 431   874
Total 230,309   234,064
Commercial | Special mention      
Credit quality categories      
Prior 165   116
Year One 0   0
Year Two 39   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 528   703
Revolving Converted to Term Loans 0   11
Total 732   830
Commercial | Substandard      
Credit quality categories      
Prior 650   515
Year One 6   0
Year Two 1,517   8
Year Three 925   1,257
Year Four 0   500
Year Five 0   0
Revolving Loans 360   257
Revolving Converted to Term Loans 0   501
Total 3,458   3,038
Consumer      
Credit quality categories      
Prior 11,098   1,317
Year One 57,487   10,469
Year Two 109,191   60,766
Year Three 56,790   115,499
Year Four 46,983   62,215
Year Five 17,776   52,798
Revolving Loans 682   682
Revolving Converted to Term Loans 0   0
Total 300,007   303,746
Current period gross charge-offs      
Gross charge-offs, prior (140)   (1,287)
Gross charge-offs, Year One (34)   (12)
Gross charge-offs, Year Two (287)   (389)
Gross charge-offs, Year Three (17)   (1,764)
Gross charge-offs, Year Four 0   (177)
Gross charge-offs, Year Five 0   0
Revolving Loans (4)   (17)
Revolving Converted to Term Loans 0   0
Total gross charge-offs (482) (525) (3,646)
Consumer | Pass      
Credit quality categories      
Prior 11,098   1,315
Year One 57,447   10,469
Year Two 109,068   60,718
Year Three 56,232   114,639
Year Four 46,983   61,652
Year Five 17,776   52,798
Revolving Loans 682   682
Revolving Converted to Term Loans 0   0
Total 299,286   302,273
Consumer | Special mention      
Credit quality categories      
Prior 0   0
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total 0   0
Consumer | Substandard      
Credit quality categories      
Prior 0   2
Year One 40   0
Year Two 123   48
Year Three 558   860
Year Four 0   563
Year Five 0   0
Revolving Loans 0   0
Revolving Converted to Term Loans 0   0
Total 721   1,473
Credit cards      
Credit quality categories      
Prior 0   0
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 6,800   7,099
Revolving Converted to Term Loans 0   0
Total 6,800   7,099
Current period gross charge-offs      
Gross charge-offs, prior 0   0
Gross charge-offs, Year One 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Five 0   0
Revolving Loans (242)   (584)
Revolving Converted to Term Loans 0   0
Total gross charge-offs (242) $ (116) (584)
Credit cards | Performing      
Credit quality categories      
Prior 0   0
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 6,779   6,931
Revolving Converted to Term Loans 0   0
Total 6,779   6,931
Credit cards | Nonperforming      
Credit quality categories      
Prior 0   0
Year One 0   0
Year Two 0   0
Year Three 0   0
Year Four 0   0
Year Five 0   0
Revolving Loans 21   168
Revolving Converted to Term Loans 0   0
Total $ 21   $ 168