Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands	Mar. 31, 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	2	2
Individually evaluated loans, amortized cost	$ 2,300	$ 2,400
Individually evaluated loans, allowance for credit losses	0	0
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	16,284	17,233
Recorded total loans	8,264,578	8,150,147
Loans in non-accrual without an allowance for credit losses	1,000	1,100
Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	25,015	26,690
31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	18,516	18,155
61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,171	4,712
Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,328	3,823
Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	8,223,279	8,106,224
C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,265,764	1,241,157
CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,730,114	2,695,408
Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,002,061	962,701
Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	920,084	856,798
Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	241,073	279,588
Commercial Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	7,028	8,024
Recorded total loans	3,995,878	3,936,565
Commercial Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,727	877
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,546	678
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	181	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	3,985,123	3,927,664
Commercial Loans [Member] | C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	1,785	2,244
Recorded total loans	1,265,764	1,241,157
Commercial Loans [Member] | C&I [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,857	445
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,676	342
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	181	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	1,261,122	1,238,468
Commercial Loans [Member] | CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	5,243	5,780
Recorded total loans	2,730,114	2,695,408
Commercial Loans [Member] | CRE [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	870	432
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	870	336
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	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	2,724,001	2,689,196
Consumer Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	1,974	1,667
Recorded total loans	2,163,218	2,099,087
Consumer Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	18,025	21,991
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	12,567	14,981
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,528	3,962
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,930	3,048
Consumer Loans [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,143,219	2,075,429
Consumer Loans [Member] | Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	1,693	1,494
Recorded total loans	1,002,061	962,701
Consumer Loans [Member] | Auto [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	8,121	10,818
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	6,852	8,640
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	885	1,393
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	384	785
Consumer Loans [Member] | Auto [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	992,247	950,389
Consumer Loans [Member] | Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	183	79
Recorded total loans	920,084	856,798
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,445	4,063
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,419	2,858
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	773	731
Consumer Loans [Member] | Residential Solar [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	253	474
Consumer Loans [Member] | Residential Solar [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	916,456	852,656
Consumer Loans [Member] | Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	98	94
Recorded total loans	241,073	279,588
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	6,459	7,110
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,296	3,483
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,870	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	1,293	1,789
Consumer Loans [Member] | Other Consumer [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	234,516	272,384
Residential [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	7,282	7,542
Recorded total loans	2,105,482	2,114,495
Residential [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,263	3,822
Residential [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,403	2,496
Residential [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	462	555
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	398	771
Residential [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	$ 2,094,937	$ 2,103,131