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
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