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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, 2026
Mar. 31, 2025
Dec. 31, 2025
Credit quality categories      
Prior $ 1,958,739   $ 1,362,664
Year Five 972,210   663,013
Year Four 517,049   987,622
Year Three 455,864   543,191
Year Two 617,211   457,635
Year One 78,876   616,747
Revolving loans 245,526   238,924
Revolving converted to term loans 2,555   30,506
Total 4,848,030   4,900,302
Current period gross charge-offs      
Total gross charge-offs (1,256) $ (726)  
Total loans evaluated by performing status      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 4,336   4,521
Revolving converted to term loans 0   0
Total 4,336   4,521
Current period gross charge-offs      
Gross charge-offs, Prior (577)   (636)
Gross charge-offs, Year Five (399)   (2,739)
Gross charge-offs, Year Four (149)   (1,595)
Gross charge-offs, Year Three (17)   (975)
Gross charge-offs, Year Two (15)   (324)
Gross charge-offs, Year One 0   0
Revolving loans (99)   (979)
Revolving converted to term loans 0   (31)
Total gross charge-offs (1,256)   (7,279)
Total loans by risk category      
Credit quality categories      
Prior 1,958,739   1,362,664
Year Five 972,210   663,013
Year Four 517,049   987,622
Year Three 455,864   543,191
Year Two 617,211   457,635
Year One 78,876   616,747
Revolving loans 241,190   234,403
Revolving converted to term loans 2,555   30,506
Total 4,843,694   4,895,781
Current period gross charge-offs      
Gross charge-offs, Prior (577)   (636)
Gross charge-offs, Year Five (399)   (2,739)
Gross charge-offs, Year Four (149)   (1,595)
Gross charge-offs, Year Three (17)   (975)
Gross charge-offs, Year Two (15)   (324)
Gross charge-offs, Year One 0   0
Revolving loans (19)   (444)
Revolving converted to term loans 0   (31)
Total gross charge-offs (1,176)   (6,744)
Pass      
Credit quality categories      
Prior 1,878,367   1,316,177
Year Five 903,283   625,423
Year Four 495,179   948,569
Year Three 453,706   540,936
Year Two 616,109   457,235
Year One 78,586   616,279
Revolving loans 235,864   230,110
Revolving converted to term loans 2,555   30,333
Total 4,663,649   4,765,062
Special mention      
Credit quality categories      
Prior 45,085   18,928
Year Five 51,204   17,688
Year Four 940   34,792
Year Three 342   953
Year Two 52   76
Year One 0   54
Revolving loans 148   910
Revolving converted to term loans 0   0
Total 97,771   73,401
Substandard      
Credit quality categories      
Prior 35,287   27,559
Year Five 17,723   19,902
Year Four 20,930   4,261
Year Three 1,816   1,302
Year Two 1,050   324
Year One 290   414
Revolving loans 5,178   3,383
Revolving converted to term loans 0   173
Total 82,274   57,318
Commercial real estate      
Credit quality categories      
Prior 1,317,534   975,147
Year Five 589,639   384,409
Year Four 238,785   593,778
Year Three 152,078   242,514
Year Two 263,112   140,212
Year One 19,074   265,405
Revolving loans 19,443   15,395
Revolving converted to term loans 150   27,136
Total 2,599,815   2,643,996
Current period gross charge-offs      
Gross charge-offs, Prior 0   (109)
Gross charge-offs, Year Five 0   (2,640)
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year One 0   0
Revolving loans 0   0
Revolving converted to term loans 0   0
Total gross charge-offs 0 0 (2,749)
Commercial real estate | Pass      
Credit quality categories      
Prior 1,263,079   939,986
Year Five 522,428   364,719
Year Four 218,721   556,924
Year Three 150,567   242,170
Year Two 262,491   139,929
Year One 19,074   265,405
Revolving loans 19,093   14,703
Revolving converted to term loans 150   27,136
Total 2,455,603   2,550,972
Commercial real estate | Special mention      
Credit quality categories      
Prior 28,222   15,105
Year Five 50,924   2,884
Year Four 341   34,014
Year Three 272   344
Year Two 0   0
Year One 0   0
Revolving loans 0   0
Revolving converted to term loans 0   0
Total 79,759   52,347
Commercial real estate | Substandard      
Credit quality categories      
Prior 26,233   20,056
Year Five 16,287   16,806
Year Four 19,723   2,840
Year Three 1,239   0
Year Two 621   283
Year One 0   0
Revolving loans 350   692
Revolving converted to term loans 0   0
Total 64,453   40,677
Residential real estate      
Credit quality categories      
Prior 509,093   328,473
Year Five 273,117   198,987
Year Four 199,974   276,136
Year Three 157,905   216,231
Year Two 123,193   147,517
Year One 25,120   114,412
Revolving loans 137,291   132,513
Revolving converted to term loans 40   695
Total 1,425,733   1,414,964
Current period gross charge-offs      
Gross charge-offs, Prior (138)   (5)
Gross charge-offs, Year Five 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year One 0   0
Revolving loans (4)   (45)
Revolving converted to term loans 0   0
Total gross charge-offs (142) 0 (50)
Residential real estate | Pass      
Credit quality categories      
Prior 484,287   317,764
Year Five 272,211   182,198
Year Four 199,154   275,869
Year Three 157,905   215,397
Year Two 123,083   147,517
Year One 25,120   114,300
Revolving loans 136,107   131,075
Revolving converted to term loans 40   695
Total 1,397,907   1,384,815
Residential real estate | Special mention      
Credit quality categories      
Prior 16,841   3,719
Year Five 191   14,777
Year Four 504   0
Year Three 0   504
Year Two 0   0
Year One 0   0
Revolving loans 65   65
Revolving converted to term loans 0   0
Total 17,601   19,065
Residential real estate | Substandard      
Credit quality categories      
Prior 7,965   6,990
Year Five 715   2,012
Year Four 316   267
Year Three 0   330
Year Two 110   0
Year One 0   112
Revolving loans 1,119   1,373
Revolving converted to term loans 0   0
Total 10,225   11,084
Construction      
Credit quality categories      
Prior 33,030   27,182
Year Five 6,929   7,238
Year Four 27,791   7,047
Year Three 90,705   28,868
Year Two 151,945   108,885
Year One 17,237   151,981
Revolving loans 14,252   13,070
Revolving converted to term loans 946   632
Total 342,835   344,903
Current period gross charge-offs      
Gross charge-offs, Prior 0   0
Gross charge-offs, Year Five 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year One 0   0
Revolving loans 0   0
Revolving converted to term loans 0   0
Total gross charge-offs 0 0 0
Construction | Pass      
Credit quality categories      
Prior 32,869   27,094
Year Five 6,929   7,238
Year Four 27,791   7,047
Year Three 90,705   28,868
Year Two 151,703   108,885
Year One 17,237   151,738
Revolving loans 14,252   13,070
Revolving converted to term loans 946   632
Total 342,432   344,572
Construction | Special mention      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 0   0
Revolving converted to term loans 0   0
Total 0   0
Construction | Substandard      
Credit quality categories      
Prior 161   88
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 242   0
Year One 0   243
Revolving loans 0   0
Revolving converted to term loans 0   0
Total 403   331
Commercial      
Credit quality categories      
Prior 49,160   23,907
Year Five 18,748   26,600
Year Four 14,634   20,604
Year Three 27,390   15,557
Year Two 34,158   29,383
Year One 5,847   35,256
Revolving loans 69,477   72,656
Revolving converted to term loans 1,419   2,043
Total 220,833   226,006
Current period gross charge-offs      
Gross charge-offs, Prior (2)   (71)
Gross charge-offs, Year Five (37)   0
Gross charge-offs, Year Four (149)   0
Gross charge-offs, Year Three 0   (329)
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year One 0   0
Revolving loans (15)   (381)
Revolving converted to term loans 0   (31)
Total gross charge-offs (203) (2) (812)
Commercial | Pass      
Credit quality categories      
Prior 48,218   23,379
Year Five 17,998   25,518
Year Four 14,055   19,739
Year Three 26,743   14,925
Year Two 34,088   29,307
Year One 5,557   35,202
Revolving loans 65,685   70,493
Revolving converted to term loans 1,419   1,870
Total 213,763   220,433
Commercial | Special mention      
Credit quality categories      
Prior 22   104
Year Five 89   27
Year Four 95   107
Year Three 70   105
Year Two 52   76
Year One 0   54
Revolving loans 83   845
Revolving converted to term loans 0   0
Total 411   1,318
Commercial | Substandard      
Credit quality categories      
Prior 920   424
Year Five 661   1,055
Year Four 484   758
Year Three 577   527
Year Two 18   0
Year One 290   0
Revolving loans 3,709   1,318
Revolving converted to term loans 0   173
Total 6,659   4,255
Consumer      
Credit quality categories      
Prior 49,922   7,955
Year Five 83,777   45,779
Year Four 35,865   90,057
Year Three 27,786   40,021
Year Two 44,803   31,638
Year One 11,598   49,693
Revolving loans 727   769
Revolving converted to term loans 0   0
Total 254,478   265,912
Current period gross charge-offs      
Gross charge-offs, Prior (437)   (451)
Gross charge-offs, Year Five (362)   (99)
Gross charge-offs, Year Four 0   (1,595)
Gross charge-offs, Year Three (17)   (646)
Gross charge-offs, Year Two (15)   (324)
Gross charge-offs, Year One 0   0
Revolving loans 0   (18)
Revolving converted to term loans 0   0
Total gross charge-offs (831) (482) (3,133)
Consumer | Pass      
Credit quality categories      
Prior 49,914   7,954
Year Five 83,717   45,750
Year Four 35,458   88,990
Year Three 27,786   39,576
Year Two 44,744   31,597
Year One 11,598   49,634
Revolving loans 727   769
Revolving converted to term loans 0   0
Total 253,944   264,270
Consumer | Special mention      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   671
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 0   0
Revolving converted to term loans 0   0
Total 0   671
Consumer | Substandard      
Credit quality categories      
Prior 8   1
Year Five 60   29
Year Four 407   396
Year Three 0   445
Year Two 59   41
Year One 0   59
Revolving loans 0   0
Revolving converted to term loans 0   0
Total 534   971
Credit cards      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 4,336   4,521
Revolving converted to term loans 0   0
Total 4,336   4,521
Current period gross charge-offs      
Gross charge-offs, Prior 0   0
Gross charge-offs, Year Five 0   0
Gross charge-offs, Year Four 0   0
Gross charge-offs, Year Three 0   0
Gross charge-offs, Year Two 0   0
Gross charge-offs, Year One 0   0
Revolving loans (80)   (535)
Revolving converted to term loans 0   0
Total gross charge-offs (80) $ (242) (535)
Credit cards | Performing      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 4,273   4,473
Revolving converted to term loans 0   0
Total 4,273   4,473
Credit cards | Nonperforming      
Credit quality categories      
Prior 0   0
Year Five 0   0
Year Four 0   0
Year Three 0   0
Year Two 0   0
Year One 0   0
Revolving loans 63   48
Revolving converted to term loans 0   0
Total $ 63   $ 48