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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands | Mar. 31, 2024 USD ($) Relationship | Dec. 31, 2023 USD ($) Relationship
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Allowance for Credit Losses and Credit Quality of Loans [Abstract] |  |
Threshold balance for loans specifically evaluated for individual credit loss | $ 1,000 |
Individually evaluated loans, number of relationships | Relationship | 2 | 2
Individually evaluated loans, amortized cost | $ 17,100 | $ 17,300
Individually evaluated loans, allowance for credit losses | 0 | 0
Loans in non-accrual without an allowance for credit losses | 17,100 | 17,300
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 35,189 | 34,213
Recorded total loans | 9,688,077 | 9,650,713
Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 32,277 | 30,636
31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 23,809 | 20,585
61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,868 | 6,390
Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,600 | 3,661
Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 9,620,611 | 9,585,864
C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,404,371 | 1,397,505
CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,445,546 | 3,433,748
Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,158,073 | 1,099,442
Residential Solar [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 896,147 | 917,755
Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 150,765 | 170,360
Commercial Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 21,822 | 21,567
Recorded total loans | 4,849,917 | 4,831,253
Commercial Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,454 | 2,086
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,640 | 1,217
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 814 | 868
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 1
Commercial Loans [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,823,641 | 4,807,600
Commercial Loans [Member] | C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 3,079 | 3,441
Recorded total loans | 1,404,371 | 1,397,505
Commercial Loans [Member] | C&I [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,461 | 448
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,711 | 414
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 750 | 33
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 1
Commercial Loans [Member] | C&I [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,398,831 | 1,393,616
Commercial Loans [Member] | CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 18,743 | 18,126
Recorded total loans | 3,445,546 | 3,433,748
Commercial Loans [Member] | CRE [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,993 | 1,638
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,929 | 803
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 64 | 835
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 0 | 0
Commercial Loans [Member] | CRE [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,424,810 | 3,413,984
Consumer Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 2,698 | 2,566
Recorded total loans | 2,204,985 | 2,187,557
Consumer Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 22,939 | 23,761
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 16,370 | 15,532
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,196 | 5,123
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,373 | 3,106
Consumer Loans [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,179,348 | 2,161,230
Consumer Loans [Member] | Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 2,274 | 2,106
Recorded total loans | 1,158,073 | 1,099,442
Consumer Loans [Member] | Auto [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 13,097 | 13,193
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 10,376 | 10,115
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,676 | 2,011
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,045 | 1,067
Consumer Loans [Member] | Auto [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,142,702 | 1,084,143
Consumer Loans [Member] | Residential Solar [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 125 | 245
Recorded total loans | 896,147 | 917,755
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,748 | 5,290
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,940 | 3,074
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,362 | 1,301
Consumer Loans [Member] | Residential Solar [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 446 | 915
Consumer Loans [Member] | Residential Solar [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 890,274 | 912,220
Consumer Loans [Member] | Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 299 | 215
Recorded total loans | 150,765 | 170,360
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,094 | 5,278
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,054 | 2,343
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,158 | 1,811
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 882 | 1,124
Consumer Loans [Member] | Other Consumer [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 146,372 | 164,867
Residential [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 10,669 | 10,080
Recorded total loans | 2,633,175 | 2,631,903
Residential [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,884 | 4,789
Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,799 | 3,836
Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 858 | 399
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 227 | 554
Residential [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | $ 2,617,622 | $ 2,617,034

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