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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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 $ 364,006 $ 1,444,621
2023/2022 1,436,145 1,989,711
2022/2021 1,864,247 1,688,309
2021/2020 1,610,531 1,019,863
2020/2019 996,330 692,961
Prior 2,407,804 1,840,266
Revolving Loans Amortized Cost Basis 937,568 920,868
Revolving Loans Converted to Term 71,446 54,114
Total 9,688,077 9,650,713
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 (1,161)
2023/2022 (586) (9,878)
2022/2021 (3,114) (9,586)
2021/2020 (1,815) (1,830)
2020/2019 (376) (1,805)
Prior (789) (2,518)
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total (6,680) (26,778)
C&I [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 60,820 231,165
2023/2022 219,735 274,930
2022/2021 249,576 243,881
2021/2020 233,859 161,857
2020/2019 150,543 76,826
Prior 137,971 71,313
Revolving Loans Amortized Cost Basis 348,904 333,003
Revolving Loans Converted to Term 2,963 4,530
Total 1,404,371 1,397,505
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 (24)
2023/2022 (9) (3,021)
2022/2021 (900) (5)
2021/2020 0 (86)
2020/2019 0 0
Prior (76) (600)
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total (985) (3,736)
C&I [Member] | Pass [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 60,820 229,249
2023/2022 214,985 270,796
2022/2021 243,619 241,993
2021/2020 231,577 158,051
2020/2019 146,409 74,469
Prior 129,310 63,826
Revolving Loans Amortized Cost Basis 318,078 299,248
Revolving Loans Converted to Term 2,585 2,923
Total 1,347,383 1,340,555
C&I [Member] | Special Mention [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 420
2023/2022 1,795 1,672
2022/2021 2,802 277
2021/2020 378 3,524
2020/2019 3,845 87
Prior 1,812 1,854
Revolving Loans Amortized Cost Basis 15,946 19,489
Revolving Loans Converted to Term 251 0
Total 26,829 27,323
C&I [Member] | Substandard [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 1,496
2023/2022 2,934 2,461
2022/2021 3,154 1,609
2021/2020 1,885 282
2020/2019 289 2,266
Prior 6,845 5,632
Revolving Loans Amortized Cost Basis 14,880 14,266
Revolving Loans Converted to Term 127 1,607
Total 30,114 29,619
C&I [Member] | Doubtful [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 0
2023/2022 21 1
2022/2021 1 2
2021/2020 19 0
2020/2019 0 4
Prior 4 1
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 45 8
CRE [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 81,048 357,108
2023/2022 366,262 523,404
2022/2021 499,358 594,415
2021/2020 572,590 460,311
2020/2019 454,540 340,767
Prior 1,103,458 816,067
Revolving Loans Amortized Cost Basis 314,066 307,971
Revolving Loans Converted to Term 54,224 33,705
Total 3,445,546 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 81,048 353,161
2023/2022 362,660 518,201
2022/2021 492,661 561,897
2021/2020 546,787 452,110
2020/2019 449,533 327,804
Prior 1,013,118 739,189
Revolving Loans Amortized Cost Basis 308,977 294,039
Revolving Loans Converted to Term 37,243 33,705
Total 3,292,027 3,280,106
CRE [Member] | Special Mention [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 3,577
2023/2022 3,602 4,472
2022/2021 5,971 10,711
2021/2020 7,842 7,055
2020/2019 3,875 9,967
Prior 28,841 39,460
Revolving Loans Amortized Cost Basis 3,547 2,970
Revolving Loans Converted to Term 0 0
Total 53,678 78,212
CRE [Member] | Substandard [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 370
2023/2022 0 731
2022/2021 726 21,807
2021/2020 17,961 1,146
2020/2019 1,132 2,996
Prior 61,499 37,418
Revolving Loans Amortized Cost Basis 1,542 10,962
Revolving Loans Converted to Term 16,981 0
Total 99,841 75,430
Auto [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 175,480 474,901
2023/2022 431,015 364,757
2022/2021 332,373 158,081
2021/2020 139,639 42,834
2020/2019 36,234 45,712
Prior 43,332 13,145
Revolving Loans Amortized Cost Basis 0 12
Revolving Loans Converted to Term 0 0
Total 1,158,073 1,099,442
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 (102)
2023/2022 (274) (1,183)
2022/2021 (493) (1,066)
2021/2020 (226) (340)
2020/2019 (12) (301)
Prior (122) (295)
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total (1,127) (3,287)
Auto [Member] | Performing [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 175,451 474,369
2023/2022 430,001 363,516
2022/2021 331,202 157,251
2021/2020 138,915 42,644
2020/2019 36,140 45,406
Prior 43,045 13,071
Revolving Loans Amortized Cost Basis 0 12
Revolving Loans Converted to Term 0 0
Total 1,154,754 1,096,269
Auto [Member] | Nonperforming [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 29 532
2023/2022 1,014 1,241
2022/2021 1,171 830
2021/2020 724 190
2020/2019 94 306
Prior 287 74
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 3,319 3,173
Residential Solar [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 1,365 155,425
2023/2022 149,789 431,692
2022/2021 422,854 179,044
2021/2020 176,234 65,400
2020/2019 63,222 46,601
Prior 82,683 39,593
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 896,147 917,755
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 (150)
2023/2022 (53) (1,930)
2022/2021 (910) (923)
2021/2020 (136) (45)
2020/2019 0 (558)
Prior (196) (345)
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total (1,295) (3,951)
Residential Solar [Member] | Performing [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 1,365 155,425
2023/2022 149,789 430,855
2022/2021 422,422 178,839
2021/2020 176,158 65,382
2020/2019 63,222 46,554
Prior 82,620 39,540
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 895,576 916,595
Residential Solar [Member] | Nonperforming [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 0
2023/2022 0 837
2022/2021 432 205
2021/2020 76 18
2020/2019 0 47
Prior 63 53
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 571 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
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 5,600 13,089
2023/2022 10,564 27,638
2022/2021 22,904 58,561
2021/2020 48,597 21,231
2020/2019 18,068 14,604
Prior 25,976 16,125
Revolving Loans Amortized Cost Basis 19,016 19,046
Revolving Loans Converted to Term 40 66
Total 150,765 170,360
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 (885)
2023/2022 (250) (3,744)
2022/2021 (811) (7,511)
2021/2020 (1,453) (1,329)
2020/2019 (364) (832)
Prior (281) (568)
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total (3,159) (14,869)
Other Consumer [Member] | Performing [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 5,600 13,089
2023/2022 10,559 27,394
2022/2021 22,720 57,876
2021/2020 47,947 21,087
2020/2019 18,029 14,548
Prior 25,681 15,964
Revolving Loans Amortized Cost Basis 19,015 19,042
Revolving Loans Converted to Term 33 21
Total 149,584 169,021
Other Consumer [Member] | Nonperforming [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 0
2023/2022 5 244
2022/2021 184 685
2021/2020 650 144
2020/2019 39 56
Prior 295 161
Revolving Loans Amortized Cost Basis 1 4
Revolving Loans Converted to Term 7 45
Total 1,181 1,339
Residential [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 39,693 212,933
2023/2022 258,780 367,290
2022/2021 337,182 454,327
2021/2020 439,612 268,230
2020/2019 273,723 168,451
Prior 1,014,384 884,023
Revolving Loans Amortized Cost Basis 255,582 260,836
Revolving Loans Converted to Term 14,219 15,813
Total 2,633,175 2,631,903
Gross Charge-offs by Loan Class by Vintage [Abstract]    
2024/2023 0 0
2023/2022 0 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 (114) (517)
Residential [Member] | Performing [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 39,693 212,799
2023/2022 258,154 366,860
2022/2021 336,357 453,206
2021/2020 438,007 267,845
2020/2019 273,451 167,860
Prior 1,006,816 876,563
Revolving Loans Amortized Cost Basis 255,582 260,836
Revolving Loans Converted to Term 14,219 15,300
Total 2,622,279 2,621,269
Residential [Member] | Nonperforming [Member]    
Credit Quality by Loan Class by Vintage [Abstract]    
2024/2023 0 134
2023/2022 626 430
2022/2021 825 1,121
2021/2020 1,605 385
2020/2019 272 591
Prior 7,568 7,460
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 513
Total $ 10,896 $ 10,634