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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]        
Minimum number of days past due for loans to be considered nonperforming     90 days  
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 $ 1,116,149   $ 1,116,149 $ 1,444,621
2023/2022 1,252,819   1,252,819 1,989,711
2022/2021 1,840,946   1,840,946 1,688,309
2021/2020 1,488,670   1,488,670 1,019,863
2020/2019 915,395   915,395 692,961
Prior 2,224,707   2,224,707 1,840,266
Revolving Loans Amortized Cost Basis 989,995   989,995 920,868
Revolving Loans Converted to Term 78,360   78,360 54,114
Total 9,907,041   9,907,041 9,650,713
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     (549) (1,161)
2023/2022     (1,893) (9,878)
2022/2021     (7,094) (9,586)
2021/2020     (4,813) (1,830)
2020/2019     (1,008) (1,805)
Prior     (3,027) (2,518)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total (6,077) $ (6,321) (18,384) (26,778)
C&I [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 207,281   207,281 231,165
2023/2022 192,347   192,347 274,930
2022/2021 216,637   216,637 243,881
2021/2020 195,721   195,721 161,857
2020/2019 131,758   131,758 76,826
Prior 113,264   113,264 71,313
Revolving Loans Amortized Cost Basis 402,228   402,228 333,003
Revolving Loans Converted to Term 1,269   1,269 4,530
Total 1,460,505   1,460,505 1,397,505
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     0 (24)
2023/2022     (60) (3,021)
2022/2021     (970) (5)
2021/2020     (46) (86)
2020/2019     0 0
Prior     (1,325) (600)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total     (2,401) (3,736)
C&I [Member] | Pass [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 205,707   205,707 229,249
2023/2022 185,044   185,044 270,796
2022/2021 210,068   210,068 241,993
2021/2020 193,872   193,872 158,051
2020/2019 128,275   128,275 74,469
Prior 106,919   106,919 63,826
Revolving Loans Amortized Cost Basis 354,396   354,396 299,248
Revolving Loans Converted to Term 1,006   1,006 2,923
Total 1,385,287   1,385,287 1,340,555
C&I [Member] | Special Mention [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 420
2023/2022 3,627   3,627 1,672
2022/2021 4,333   4,333 277
2021/2020 354   354 3,524
2020/2019 3,273   3,273 87
Prior 1,237   1,237 1,854
Revolving Loans Amortized Cost Basis 29,624   29,624 19,489
Revolving Loans Converted to Term 156   156 0
Total 42,604   42,604 27,323
C&I [Member] | Substandard [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 1,574   1,574 1,496
2023/2022 3,590   3,590 2,461
2022/2021 2,234   2,234 1,609
2021/2020 1,465   1,465 282
2020/2019 210   210 2,266
Prior 5,108   5,108 5,632
Revolving Loans Amortized Cost Basis 18,208   18,208 14,266
Revolving Loans Converted to Term 107   107 1,607
Total 32,496   32,496 29,619
C&I [Member] | Doubtful [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 0
2023/2022 86   86 1
2022/2021 2   2 2
2021/2020 30   30 0
2020/2019 0   0 4
Prior 0   0 1
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 0   0 0
Total 118   118 8
CRE [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 321,437   321,437 357,108
2023/2022 347,167   347,167 523,404
2022/2021 563,876   563,876 594,415
2021/2020 551,739   551,739 460,311
2020/2019 434,137   434,137 340,767
Prior 1,031,068   1,031,068 816,067
Revolving Loans Amortized Cost Basis 308,668   308,668 307,971
Revolving Loans Converted to Term 60,991   60,991 33,705
Total 3,619,083   3,619,083 3,433,748
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     0 0
2023/2022     0 0
2022/2021     0 0
2021/2020     0 0
2020/2019     0 (114)
Prior     0 (304)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total     0 (418)
CRE [Member] | Pass [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 320,351   320,351 353,161
2023/2022 340,273   340,273 518,201
2022/2021 531,189   531,189 561,897
2021/2020 528,054   528,054 452,110
2020/2019 425,647   425,647 327,804
Prior 954,218   954,218 739,189
Revolving Loans Amortized Cost Basis 304,846   304,846 294,039
Revolving Loans Converted to Term 59,356   59,356 33,705
Total 3,463,934   3,463,934 3,280,106
CRE [Member] | Special Mention [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 1,086   1,086 3,577
2023/2022 5,838   5,838 4,472
2022/2021 13,492   13,492 10,711
2021/2020 5,873   5,873 7,055
2020/2019 5,137   5,137 9,967
Prior 18,463   18,463 39,460
Revolving Loans Amortized Cost Basis 2,156   2,156 2,970
Revolving Loans Converted to Term 1,135   1,135 0
Total 53,180   53,180 78,212
CRE [Member] | Substandard [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 370
2023/2022 1,056   1,056 731
2022/2021 19,195   19,195 21,807
2021/2020 17,812   17,812 1,146
2020/2019 3,353   3,353 2,996
Prior 58,387   58,387 37,418
Revolving Loans Amortized Cost Basis 1,666   1,666 10,962
Revolving Loans Converted to Term 500   500 0
Total 101,969   101,969 75,430
Auto [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 428,488   428,488 474,901
2023/2022 357,230   357,230 364,757
2022/2021 268,588   268,588 158,081
2021/2020 104,711   104,711 42,834
2020/2019 24,206   24,206 45,712
Prior 21,066   21,066 13,145
Revolving Loans Amortized Cost Basis 0   0 12
Revolving Loans Converted to Term 0   0 0
Total 1,204,289   1,204,289 1,099,442
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     (76) (102)
2023/2022     (1,047) (1,183)
2022/2021     (1,266) (1,066)
2021/2020     (692) (340)
2020/2019     (74) (301)
Prior     (292) (295)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total     (3,447) (3,287)
Auto [Member] | Performing [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 428,158   428,158 474,369
2023/2022 356,542   356,542 363,516
2022/2021 267,785   267,785 157,251
2021/2020 104,174   104,174 42,644
2020/2019 24,059   24,059 45,406
Prior 20,973   20,973 13,071
Revolving Loans Amortized Cost Basis 0   0 12
Revolving Loans Converted to Term 0   0 0
Total 1,201,691   1,201,691 1,096,269
Auto [Member] | Nonperforming [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 330   330 532
2023/2022 688   688 1,241
2022/2021 803   803 830
2021/2020 537   537 190
2020/2019 147   147 306
Prior 93   93 74
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 0   0 0
Total 2,598   2,598 3,173
Residential Solar [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 2,835   2,835 155,425
2023/2022 126,279   126,279 431,692
2022/2021 406,636   406,636 179,044
2021/2020 169,604   169,604 65,400
2020/2019 59,055   59,055 46,601
Prior 75,250   75,250 39,593
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 0   0 0
Total 839,659   839,659 917,755
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     0 (150)
2023/2022     (441) (1,930)
2022/2021     (3,152) (923)
2021/2020     (582) (45)
2020/2019     (103) (558)
Prior     (561) (345)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total     (4,839) (3,951)
Residential Solar [Member] | Performing [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 2,835   2,835 155,425
2023/2022 126,251   126,251 430,855
2022/2021 405,550   405,550 178,839
2021/2020 169,484   169,484 65,382
2020/2019 58,968   58,968 46,554
Prior 75,097   75,097 39,540
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 0   0 0
Total 838,185   838,185 916,595
Residential Solar [Member] | Nonperforming [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 0
2023/2022 28   28 837
2022/2021 1,086   1,086 205
2021/2020 120   120 18
2020/2019 87   87 47
Prior 153   153 53
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 0   0 0
Total 1,474   1,474 1,160
Other Consumer [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Overdrawn deposit related to gross charge-offs reported as 2022 originations       200
Overdrawn deposit related to gross charge-offs reported as 2023 originations     200 800
Overdrawn deposit related to gross charge-offs reported as 2024 originations     500  
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 14,484   14,484 13,089
2023/2022 7,779   7,779 27,638
2022/2021 15,383   15,383 58,561
2021/2020 33,101   33,101 21,231
2020/2019 13,141   13,141 14,604
Prior 18,718   18,718 16,125
Revolving Loans Amortized Cost Basis 21,059   21,059 19,046
Revolving Loans Converted to Term 43   43 66
Total 123,708   123,708 170,360
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     (473) (885)
2023/2022     (311) (3,744)
2022/2021     (1,706) (7,511)
2021/2020     (3,493) (1,329)
2020/2019     (831) (832)
Prior     (735) (568)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total     (7,549) (14,869)
Other Consumer [Member] | Performing [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 14,484   14,484 13,089
2023/2022 7,740   7,740 27,394
2022/2021 15,144   15,144 57,876
2021/2020 32,682   32,682 21,087
2020/2019 13,025   13,025 14,548
Prior 18,494   18,494 15,964
Revolving Loans Amortized Cost Basis 21,058   21,058 19,042
Revolving Loans Converted to Term 23   23 21
Total 122,650   122,650 169,021
Other Consumer [Member] | Nonperforming [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 0
2023/2022 39   39 244
2022/2021 239   239 685
2021/2020 419   419 144
2020/2019 116   116 56
Prior 224   224 161
Revolving Loans Amortized Cost Basis 1   1 4
Revolving Loans Converted to Term 20   20 45
Total 1,058   1,058 1,339
Residential [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 141,624   141,624 212,933
2023/2022 222,017   222,017 367,290
2022/2021 369,826   369,826 454,327
2021/2020 433,794   433,794 268,230
2020/2019 253,098   253,098 168,451
Prior 965,341   965,341 884,023
Revolving Loans Amortized Cost Basis 258,040   258,040 260,836
Revolving Loans Converted to Term 16,057   16,057 15,813
Total 2,659,797   2,659,797 2,631,903
Gross Charge-offs by Loan Class by Vintage [Abstract]        
2024/2023     0 0
2023/2022     (34) 0
2022/2021     0 (81)
2021/2020     0 (30)
2020/2019     0 0
Prior     (114) (406)
Revolving Loans Amortized Cost Basis     0 0
Revolving Loans Converted to Term     0 0
Total (34) $ (16) (148) (517)
Residential [Member] | Performing [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 141,624   141,624 212,799
2023/2022 221,221   221,221 366,860
2022/2021 369,507   369,507 453,206
2021/2020 432,012   432,012 267,845
2020/2019 252,908   252,908 167,860
Prior 956,789   956,789 876,563
Revolving Loans Amortized Cost Basis 258,040   258,040 260,836
Revolving Loans Converted to Term 15,968   15,968 15,300
Total 2,648,069   2,648,069 2,621,269
Residential [Member] | Nonperforming [Member]        
Credit Quality by Loan Class by Vintage [Abstract]        
2024/2023 0   0 134
2023/2022 796   796 430
2022/2021 319   319 1,121
2021/2020 1,782   1,782 385
2020/2019 190   190 591
Prior 8,552   8,552 7,460
Revolving Loans Amortized Cost Basis 0   0 0
Revolving Loans Converted to Term 89   89 513
Total $ 11,728   $ 11,728 $ 10,634