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Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands	Sep. 30, 2023 USD ($) Relationship	Dec. 31, 2022 USD ($) Relationship
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Individually evaluated loans, number of relationships | Relationship	1	2
Individually evaluated loans, amortized cost	$ 1,900	$ 2,400
Individually evaluated loans, allowance for credit losses	0	0
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	20,736	17,233
Recorded total loans	9,667,375	8,150,147
Loans in non-accrual without an allowance for credit losses	1,900	1,100
Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	47,299	26,690
31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	39,490	18,155
61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,281	4,712
Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,528	3,823
Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	9,599,340	8,106,224
C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,460,830	1,241,157
CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,399,471	2,695,408
Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,069,096	962,701
Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	934,082	856,798
Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	192,204	279,588
Commercial Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	8,413	8,024
Recorded total loans	4,860,301	3,936,565
Commercial Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	20,515	877
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	20,398	678
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	117	195
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	4
Commercial Loans [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,831,373	3,927,664
Commercial Loans [Member] | C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	3,753	2,244
Recorded total loans	1,460,830	1,241,157
Commercial Loans [Member] | C&I [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	836	445
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	737	342
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	99	99
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	4
Commercial Loans [Member] | C&I [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,456,241	1,238,468
Commercial Loans [Member] | CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	4,660	5,780
Recorded total loans	3,399,471	2,695,408
Commercial Loans [Member] | CRE [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	19,679	432
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	19,661	336
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	18	96
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	3,375,132	2,689,196
Consumer Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,427	1,667
Recorded total loans	2,195,382	2,099,087
Consumer Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	21,371	21,991
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	15,017	14,981
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,838	3,962
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,516	3,048
Consumer Loans [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,171,584	2,075,429
Consumer Loans [Member] | Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	1,652	1,494
Recorded total loans	1,069,096	962,701
Consumer Loans [Member] | Auto [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	10,890	10,818
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	8,974	8,640
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,402	1,393
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	514	785
Consumer Loans [Member] | Auto [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,056,554	950,389
Consumer Loans [Member] | Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	373	79
Recorded total loans	934,082	856,798
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,893	4,063
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,449	2,858
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	938	731
Consumer Loans [Member] | Residential Solar [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	506	474
Consumer Loans [Member] | Residential Solar [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	928,816	852,656
Consumer Loans [Member] | Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	402	94
Recorded total loans	192,204	279,588
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	5,588	7,110
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,594	3,483
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,498	1,838
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,496	1,789
Consumer Loans [Member] | Other Consumer [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	186,214	272,384
Residential [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	9,896	7,542
Recorded total loans	2,611,692	2,114,495
Residential [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	5,413	3,822
Residential [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,075	2,496
Residential [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	326	555
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,012	771
Residential [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	$ 2,596,383	$ 2,103,131

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Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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