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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
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 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 $ 1,141,049   $ 1,141,049   $ 1,952,599
2022/2021 2,049,671   2,049,671   1,615,395
2021/2020 1,710,442   1,710,442   1,012,149
2020/2019 1,064,936   1,064,936   774,792
2019/2018 727,875   727,875   518,993
Prior 1,925,646   1,925,646   1,414,638
Revolving Loans Amortized Cost Basis 945,652   945,652   800,156
Revolving Loans Converted to Term 102,104   102,104   61,425
Total 9,667,375   9,667,375   8,150,147
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (757)    
2022     (4,860)    
2021     (7,389)    
2020     (1,492)    
2019     (1,375)    
Prior     (1,447)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total (6,321) $ (4,693) (17,320) $ (13,230)  
C&I [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 172,952   172,952   297,682
2022/2021 305,142   305,142   253,483
2021/2020 258,741   258,741   169,738
2020/2019 168,118   168,118   94,817
2019/2018 86,463   86,463   40,593
Prior 90,973   90,973   36,800
Revolving Loans Amortized Cost Basis 375,761   375,761   344,748
Revolving Loans Converted to Term 2,680   2,680   3,296
Total 1,460,830   1,460,830   1,241,157
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     (1)    
2021     (5)    
2020     (65)    
2019     0    
Prior     (329)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (400)    
C&I [Member] | Pass [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 171,431   171,431   296,562
2022/2021 302,023   302,023   252,480
2021/2020 257,555   257,555   164,976
2020/2019 164,254   164,254   91,497
2019/2018 83,519   83,519   39,394
Prior 75,504   75,504   32,413
Revolving Loans Amortized Cost Basis 351,672   351,672   327,166
Revolving Loans Converted to Term 2,666   2,666   3,133
Total 1,408,624   1,408,624   1,207,621
C&I [Member] | Special Mention [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   1,044
2022/2021 3,110   3,110   524
2021/2020 415   415   4,531
2020/2019 3,494   3,494   194
2019/2018 655   655   1,108
Prior 11,151   11,151   417
Revolving Loans Amortized Cost Basis 10,676   10,676   5,234
Revolving Loans Converted to Term 0   0   0
Total 29,501   29,501   13,052
C&I [Member] | Substandard [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 1,521   1,521   76
2022/2021 8   8   459
2021/2020 705   705   231
2020/2019 312   312   3,098
2019/2018 2,285   2,285   91
Prior 4,317   4,317   3,969
Revolving Loans Amortized Cost Basis 13,413   13,413   12,348
Revolving Loans Converted to Term 14   14   163
Total 22,575   22,575   20,435
C&I [Member] | Doubtful [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   0
2022/2021 1   1   20
2021/2020 66   66   0
2020/2019 58   58   28
2019/2018 4   4   0
Prior 1   1   1
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 130   130   49
CRE [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 282,579   282,579   375,227
2022/2021 513,117   513,117   466,754
2021/2020 564,984   564,984   442,196
2020/2019 481,900   481,900   340,146
2019/2018 346,642   346,642   223,612
Prior 842,081   842,081   614,625
Revolving Loans Amortized Cost Basis 286,276   286,276   203,126
Revolving Loans Converted to Term 81,892   81,892   29,722
Total 3,399,471   3,399,471   2,695,408
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     0    
2021     0    
2020     0    
2019     (114)    
Prior     0    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (114)    
CRE [Member] | Pass [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 278,517   278,517   374,313
2022/2021 510,690   510,690   465,990
2021/2020 549,056   549,056   439,012
2020/2019 470,616   470,616   333,568
2019/2018 329,634   329,634   217,141
Prior 775,502   775,502   566,783
Revolving Loans Amortized Cost Basis 276,477   276,477   201,563
Revolving Loans Converted to Term 67,162   67,162   24,735
Total 3,257,654   3,257,654   2,623,105
CRE [Member] | Special Mention [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 3,678   3,678   605
2022/2021 2,236   2,236   764
2021/2020 9,041   9,041   868
2020/2019 8,082   8,082   2,641
2019/2018 13,915   13,915   4,649
Prior 21,829   21,829   24,023
Revolving Loans Amortized Cost Basis 8,250   8,250   850
Revolving Loans Converted to Term 0   0   0
Total 67,031   67,031   34,400
CRE [Member] | Substandard [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 384   384   309
2022/2021 191   191   0
2021/2020 6,887   6,887   2,316
2020/2019 3,202   3,202   3,937
2019/2018 3,093   3,093   1,822
Prior 44,750   44,750   23,819
Revolving Loans Amortized Cost Basis 1,549   1,549   713
Revolving Loans Converted to Term 14,730   14,730   4,987
Total 74,786   74,786   37,903
Auto [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 369,321   369,321   489,366
2022/2021 396,174   396,174   239,745
2021/2020 176,700   176,700   76,257
2020/2019 50,154   50,154   100,000
2019/2018 56,647   56,647   44,277
Prior 20,087   20,087   13,056
Revolving Loans Amortized Cost Basis 13   13   0
Revolving Loans Converted to Term 0   0   0
Total 1,069,096   1,069,096   962,701
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (75)    
2022     (827)    
2021     (865)    
2020     (283)    
2019     (219)    
Prior     (243)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (2,512)    
Auto [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 369,178   369,178   488,776
2022/2021 395,362   395,362   239,090
2021/2020 176,026   176,026   75,853
2020/2019 49,917   49,917   99,615
2019/2018 56,455   56,455   44,061
Prior 19,979   19,979   13,027
Revolving Loans Amortized Cost Basis 13   13   0
Revolving Loans Converted to Term 0   0   0
Total 1,066,930   1,066,930   960,422
Auto [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 143   143   590
2022/2021 812   812   655
2021/2020 674   674   404
2020/2019 237   237   385
2019/2018 192   192   216
Prior 108   108   29
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 2,166   2,166   2,279
Residential Solar [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 155,132   155,132   486,262
2022/2021 439,449   439,449   194,069
2021/2020 182,212   182,212   74,582
2020/2019 67,618   67,618   54,687
2019/2018 48,434   48,434   36,135
Prior 41,237   41,237   11,063
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 934,082   934,082   856,798
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (121)    
2022     (1,244)    
2021     (696)    
2020     (45)    
2019     (447)    
Prior     (193)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (2,746)    
Residential Solar [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 155,132   155,132   485,942
2022/2021 438,855   438,855   193,971
2021/2020 182,153   182,153   74,532
2020/2019 67,562   67,562   54,662
2019/2018 48,362   48,362   36,119
Prior 41,139   41,139   11,019
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 933,203   933,203   856,245
Residential Solar [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   320
2022/2021 594   594   98
2021/2020 59   59   50
2020/2019 56   56   25
2019/2018 72   72   16
Prior 98   98   44
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 879   879   553
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     500    
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 11,221   11,221   52,783
2022/2021 32,303   32,303   111,462
2021/2020 69,474   69,474   36,807
2020/2019 24,299   24,299   27,630
2019/2018 17,373   17,373   15,593
Prior 18,946   18,946   15,822
Revolving Loans Amortized Cost Basis 18,553   18,553   19,226
Revolving Loans Converted to Term 35   35   265
Total 192,204   192,204   279,588
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (561)    
2022     (2,788)    
2021     (5,742)    
2020     (1,099)    
2019     (595)    
Prior     (303)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (11,088)    
Other Consumer [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 11,221   11,221   52,545
2022/2021 31,813   31,813   110,624
2021/2020 68,732   68,732   36,412
2020/2019 24,152   24,152   27,383
2019/2018 17,234   17,234   15,536
Prior 18,599   18,599   15,735
Revolving Loans Amortized Cost Basis 18,552   18,552   19,218
Revolving Loans Converted to Term 3   3   250
Total 190,306   190,306   277,703
Other Consumer [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   238
2022/2021 490   490   838
2021/2020 742   742   395
2020/2019 147   147   247
2019/2018 139   139   57
Prior 347   347   87
Revolving Loans Amortized Cost Basis 1   1   8
Revolving Loans Converted to Term 32   32   15
Total 1,898   1,898   1,885
Residential [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 149,844   149,844   251,279
2022/2021 363,486   363,486   349,882
2021/2020 458,331   458,331   212,569
2020/2019 272,847   272,847   157,512
2019/2018 172,316   172,316   158,783
Prior 912,322   912,322   723,272
Revolving Loans Amortized Cost Basis 265,049   265,049   233,056
Revolving Loans Converted to Term 17,497   17,497   28,142
Total 2,611,692   2,611,692   2,114,495
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     0    
2021     (81)    
2020     0    
2019     0    
Prior     (379)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total (16) $ (118) (460) $ (520)  
Residential [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 149,700   149,700   251,012
2022/2021 363,044   363,044   349,498
2021/2020 457,105   457,105   212,161
2020/2019 272,533   272,533   156,957
2019/2018 171,854   171,854   157,755
Prior 904,002   904,002   717,621
Revolving Loans Amortized Cost Basis 265,049   265,049   233,056
Revolving Loans Converted to Term 17,497   17,497   28,122
Total 2,600,784   2,600,784   2,106,182
Residential [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 144   144   267
2022/2021 442   442   384
2021/2020 1,226   1,226   408
2020/2019 314   314   555
2019/2018 462   462   1,028
Prior 8,320   8,320   5,651
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   20
Total $ 10,908   $ 10,908   $ 8,313