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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands | Sep. 30, 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 | $ 16,600 | $ 17,300
Individually evaluated loans, allowance for credit losses | 1,700 | 0
Loans in non-accrual without an allowance for credit losses | 1,300 | 17,300
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 33,338 | 34,213
Recorded total loans | 9,907,041 | 9,650,713
Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 35,872 | 30,636
31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 26,573 | 20,585
61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,318 | 6,390
Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,981 | 3,661
Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 9,837,831 | 9,585,864
C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,460,505 | 1,397,505
CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,619,083 | 3,433,748
Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,204,289 | 1,099,442
Residential Solar [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 839,659 | 917,755
Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 123,708 | 170,360
Commercial Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 20,461 | 21,567
Recorded total loans | 5,079,588 | 4,831,253
Commercial Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 8,154 | 2,086
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 7,924 | 1,217
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 230 | 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 | 5,050,973 | 4,807,600
Commercial Loans [Member] | C&I [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 2,452 | 3,441
Recorded total loans | 1,460,505 | 1,397,505
Commercial Loans [Member] | C&I [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,582 | 448
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,485 | 414
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 97 | 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 | 1,455,471 | 1,393,616
Commercial Loans [Member] | CRE [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 18,009 | 18,126
Recorded total loans | 3,619,083 | 3,433,748
Commercial Loans [Member] | CRE [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,572 | 1,638
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,439 | 803
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 133 | 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 | 3,595,502 | 3,413,984
Consumer Loans [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 2,173 | 2,566
Recorded total loans | 2,167,656 | 2,187,557
Consumer Loans [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 22,379 | 23,761
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 14,799 | 15,532
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 4,623 | 5,123
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,957 | 3,106
Consumer Loans [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,143,104 | 2,161,230
Consumer Loans [Member] | Auto [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 1,679 | 2,106
Recorded total loans | 1,204,289 | 1,099,442
Consumer Loans [Member] | Auto [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 12,876 | 13,193
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 10,200 | 10,115
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,757 | 2,011
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 919 | 1,067
Consumer Loans [Member] | Auto [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,189,734 | 1,084,143
Consumer Loans [Member] | Residential Solar [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 190 | 245
Recorded total loans | 839,659 | 917,755
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 6,094 | 5,290
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 2,973 | 3,074
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,837 | 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 | 1,284 | 915
Consumer Loans [Member] | Residential Solar [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 833,375 | 912,220
Consumer Loans [Member] | Other Consumer [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 304 | 215
Recorded total loans | 123,708 | 170,360
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,409 | 5,278
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,626 | 2,343
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,029 | 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 | 754 | 1,124
Consumer Loans [Member] | Other Consumer [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 119,995 | 164,867
Residential [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Nonaccrual | 10,704 | 10,080
Recorded total loans | 2,659,797 | 2,631,903
Residential [Member] | Past Due [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 5,339 | 4,789
Residential [Member] | 31-60 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 3,850 | 3,836
Residential [Member] | 61-90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 465 | 399
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | 1,024 | 554
Residential [Member] | Current [Member] |  |
Past Due and Nonperforming Loans [Abstract] |  |
Recorded total loans | $ 2,643,754 | $ 2,617,034

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