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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
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]      
2023/2022 $ 379,087   $ 1,952,599
2022/2021 1,890,474   1,615,395
2021/2020 1,562,877   1,012,149
2020/2019 965,120   774,792
2019/2018 739,552   518,993
Prior 1,845,010   1,414,638
Revolving Loans Amortized Cost Basis 803,235   800,156
Revolving Loans Converted to Term 79,223   61,425
Total 8,264,578   8,150,147
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 (1,579)    
2021 (2,582)    
2020 (647)    
2019 (441)    
Prior (601)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (5,850) $ (4,491)  
C&I [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 59,345   297,682
2022/2021 290,652   253,483
2021/2020 241,710   169,738
2020/2019 159,323   94,817
2019/2018 85,479   40,593
Prior 69,991   36,800
Revolving Loans Amortized Cost Basis 342,111   344,748
Revolving Loans Converted to Term 17,153   3,296
Total 1,265,764   1,241,157
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 (1)    
2021 (1)    
2020 (3)    
2019 0    
Prior (107)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (112)    
C&I [Member] | Pass [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 58,995   296,562
2022/2021 287,770   252,480
2021/2020 240,751   164,976
2020/2019 154,864   91,497
2019/2018 83,060   39,394
Prior 65,062   32,413
Revolving Loans Amortized Cost Basis 323,916   327,166
Revolving Loans Converted to Term 17,121   3,133
Total 1,231,539   1,207,621
C&I [Member] | Special Mention [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   1,044
2022/2021 956   524
2021/2020 524   4,531
2020/2019 3,925   194
2019/2018 90   1,108
Prior 1,439   417
Revolving Loans Amortized Cost Basis 5,965   5,234
Revolving Loans Converted to Term 0   0
Total 12,899   13,052
C&I [Member] | Substandard [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 350   76
2022/2021 1,902   459
2021/2020 435   231
2020/2019 534   3,098
2019/2018 2,301   91
Prior 3,489   3,969
Revolving Loans Amortized Cost Basis 12,230   12,348
Revolving Loans Converted to Term 32   163
Total 21,273   20,435
C&I [Member] | Doubtful [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   0
2022/2021 24   20
2021/2020 0   0
2020/2019 0   28
2019/2018 28   0
Prior 1   1
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 53   49
CRE [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 62,072   375,227
2022/2021 367,115   466,754
2021/2020 469,672   442,196
2020/2019 427,017   340,146
2019/2018 339,300   223,612
Prior 805,745   614,625
Revolving Loans Amortized Cost Basis 216,545   203,126
Revolving Loans Converted to Term 42,648   29,722
Total 2,730,114   2,695,408
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 (57)    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (57)    
CRE [Member] | Pass [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 62,072   374,313
2022/2021 364,540   465,990
2021/2020 461,622   439,012
2020/2019 417,952   333,568
2019/2018 333,603   217,141
Prior 767,943   566,783
Revolving Loans Amortized Cost Basis 211,630   201,563
Revolving Loans Converted to Term 42,648   24,735
Total 2,662,010   2,623,105
CRE [Member] | Special Mention [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   605
2022/2021 2,266   764
2021/2020 6,785   868
2020/2019 3,394   2,641
2019/2018 2,399   4,649
Prior 9,525   24,023
Revolving Loans Amortized Cost Basis 3,590   850
Revolving Loans Converted to Term 0   0
Total 27,959   34,400
CRE [Member] | Substandard [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   309
2022/2021 309   0
2021/2020 1,265   2,316
2020/2019 5,671   3,937
2019/2018 3,298   1,822
Prior 28,277   23,819
Revolving Loans Amortized Cost Basis 1,325   713
Revolving Loans Converted to Term 0   4,987
Total 40,145   37,903
Auto [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 136,907   489,366
2022/2021 456,307   239,745
2021/2020 216,908   76,257
2020/2019 66,489   100,000
2019/2018 83,846   44,277
Prior 41,604   13,056
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 1,002,061   962,701
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 (318)    
2021 (242)    
2020 (127)    
2019 (77)    
Prior (89)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (853)    
Auto [Member] | Performing [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 136,896   488,776
2022/2021 455,757   239,090
2021/2020 216,248   75,853
2020/2019 66,132   99,615
2019/2018 83,483   44,061
Prior 41,468   13,027
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 999,984   960,422
Auto [Member] | Nonperforming [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 11   590
2022/2021 550   655
2021/2020 660   404
2020/2019 357   385
2019/2018 363   216
Prior 136   29
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 2,077   2,279
Residential Solar [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 83,543   486,262
2022/2021 476,910   194,069
2021/2020 189,631   74,582
2020/2019 72,257   54,687
2019/2018 52,597   36,135
Prior 45,146   11,063
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 920,084   856,798
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 (272)    
2021 (334)    
2020 (45)    
2019 (26)    
Prior (58)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (735)    
Residential Solar [Member] | Performing [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 83,543   485,942
2022/2021 476,712   193,971
2021/2020 189,586   74,532
2020/2019 72,221   54,662
2019/2018 52,543   36,119
Prior 45,043   11,019
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 919,648   856,245
Residential Solar [Member] | Nonperforming [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   320
2022/2021 198   98
2021/2020 45   50
2020/2019 36   25
2019/2018 54   16
Prior 103   44
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 436   553
Other Consumer [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Overdrawn deposit related to gross charge-offs reported as 2022 originations 200    
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 3,689   52,783
2022/2021 41,993   111,462
2021/2020 95,665   36,807
2020/2019 31,791   27,630
2019/2018 23,665   15,593
Prior 26,301   15,822
Revolving Loans Amortized Cost Basis 17,935   19,226
Revolving Loans Converted to Term 34   265
Total 241,073   279,588
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 (988)    
2021 (2,005)    
2020 (472)    
2019 (281)    
Prior (8)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (3,754)    
Other Consumer [Member] | Performing [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 3,689   52,545
2022/2021 41,754   110,624
2021/2020 95,002   36,412
2020/2019 31,506   27,383
2019/2018 23,595   15,536
Prior 26,188   15,735
Revolving Loans Amortized Cost Basis 17,930   19,218
Revolving Loans Converted to Term 18   250
Total 239,682   277,703
Other Consumer [Member] | Nonperforming [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 0   238
2022/2021 239   838
2021/2020 663   395
2020/2019 285   247
2019/2018 70   57
Prior 113   87
Revolving Loans Amortized Cost Basis 5   8
Revolving Loans Converted to Term 16   15
Total 1,391   1,885
Residential [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 33,531   251,279
2022/2021 257,497   349,882
2021/2020 349,291   212,569
2020/2019 208,243   157,512
2019/2018 154,665   158,783
Prior 856,223   723,272
Revolving Loans Amortized Cost Basis 226,644   233,056
Revolving Loans Converted to Term 19,388   28,142
Total 2,105,482   2,114,495
Gross Charge-offs by Loan Class by Vintage [Abstract]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior (339)    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Converted to Term 0    
Total (339) $ (312)  
Residential [Member] | Performing [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 33,490   251,012
2022/2021 257,316   349,498
2021/2020 348,907   212,161
2020/2019 207,985   156,957
2019/2018 154,174   157,755
Prior 849,898   717,621
Revolving Loans Amortized Cost Basis 226,644   233,056
Revolving Loans Converted to Term 19,388   28,122
Total 2,097,802   2,106,182
Residential [Member] | Nonperforming [Member]      
Credit Quality by Loan Class by Vintage [Abstract]      
2023/2022 41   267
2022/2021 181   384
2021/2020 384   408
2020/2019 258   555
2019/2018 491   1,028
Prior 6,325   5,651
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   20
Total $ 7,680   $ 8,313