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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Relationship
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Relationship
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 7   3
Individually evaluated loans, number of new relationships | Relationship 6    
Individually evaluated loans, amortized cost $ 16,000 $ 13,900 $ 28,800
Individually evaluated loans, allowance for credit losses 0   0
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 46,450   45,819
Recorded total loans 11,595,134   9,969,910
Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 44,328   33,532
31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 32,050   21,601
61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 5,312   6,133
Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 6,966   5,798
Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 11,504,356   9,890,559
C&I [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,619,228   1,430,213
CRE [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 4,659,122   3,696,140
Auto [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,303,636   1,244,906
Residential Solar [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 757,982   820,079
Other Consumer [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 88,273   109,217
Commercial Loans [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 21,393   32,144
Recorded total loans 6,278,350   5,126,353
Commercial Loans [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 12,685   1,739
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 9,449   1,096
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,137   643
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,099   0
Commercial Loans [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 6,244,272   5,092,470
Commercial Loans [Member] | C&I [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 1,871   2,116
Recorded total loans 1,619,228   1,430,213
Commercial Loans [Member] | C&I [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,701   850
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,567   398
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,134   452
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 0   0
Commercial Loans [Member] | C&I [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,614,656   1,427,247
Commercial Loans [Member] | CRE [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 19,522   30,028
Recorded total loans 4,659,122   3,696,140
Commercial Loans [Member] | CRE [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 9,984   889
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 7,882   698
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 3   191
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,099   0
Commercial Loans [Member] | CRE [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 4,629,616   3,665,223
Consumer Loans [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 2,639   2,529
Recorded total loans 2,149,891   2,174,202
Consumer Loans [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 21,942   25,555
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 16,175   17,145
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 3,423   5,023
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,344   3,387
Consumer Loans [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,125,310   2,146,118
Consumer Loans [Member] | Auto [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 2,272   2,054
Recorded total loans 1,303,636   1,244,906
Consumer Loans [Member] | Auto [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 13,895   14,474
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 11,293   11,527
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,732   2,047
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 870   900
Consumer Loans [Member] | Auto [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,287,469   1,228,378
Consumer Loans [Member] | Residential Solar [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 195   212
Recorded total loans 757,982   820,079
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 6,006   7,656
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 3,717   4,066
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,196   1,991
Consumer Loans [Member] | Residential Solar [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,093   1,599
Consumer Loans [Member] | Residential Solar [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 751,781   812,211
Consumer Loans [Member] | Other Consumer [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 172   263
Recorded total loans 88,273   109,217
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,041   3,425
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 1,165   1,552
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 495   985
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 381   888
Consumer Loans [Member] | Other Consumer [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 86,060   105,529
Residential [Member]      
Past Due and Nonperforming Loans [Abstract]      
Nonaccrual 22,418   11,146
Recorded total loans 3,166,893   2,669,355
Residential [Member] | Past Due [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 9,701   6,238
Residential [Member] | 31-60 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 6,426   3,360
Residential [Member] | 61-90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 752   467
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans 2,523   2,411
Residential [Member] | Current [Member]      
Past Due and Nonperforming Loans [Abstract]      
Recorded total loans $ 3,134,774   $ 2,651,971