Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 7,713,570	$ 7,653,341
Nonaccrual	34,857	22,947	$ 19,052
Current
Financing Receivable, Past Due [Line Items]
Total	7,659,617	7,615,273
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total	53,953	38,068
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	14,242	7,247
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,854	7,874
Commercial Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,672,527	2,659,135
Nonaccrual	14,372	6,320	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,421,955	1,436,183
Nonaccrual	4,732	878	283
Commercial Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	367,687	350,583
Nonaccrual	4,960	4,960	384
Commercial Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,308,985	1,360,765
Nonaccrual	3,656	4,147	4,490
Commercial Loans | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,648,879	2,649,412
Commercial Loans | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,417,223	1,435,301
Commercial Loans | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	362,727	345,623
Commercial Loans | Current | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,301,340	1,351,048
Commercial Loans | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	23,648	9,723
Commercial Loans | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,732	882
Commercial Loans | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	4,960	4,960
Commercial Loans | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	7,645	9,717
Commercial Loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	9,276	0
Commercial Loans | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	4
Commercial Loans | 30-59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 30-59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	2,265	3,525
Commercial Loans | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	3,403
Commercial Loans | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,724	2,045
Consumer Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,839,756	1,731,778
Nonaccrual	6,907	6,312	6,526
Consumer Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	102,660	114,897
Nonaccrual	230	330	$ 269
Consumer Loans | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,827,336	1,719,751
Consumer Loans | Current | Other consumer
Financing Receivable, Past Due [Line Items]
Total	102,112	114,138
Consumer Loans | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	12,420	12,027
Consumer Loans | Total Past Due Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	548	759
Consumer Loans | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,516	3,352
Consumer Loans | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	185	366
Consumer Loans | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,997	2,363
Consumer Loans | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	$ 133	$ 63