Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 7,934,434	$ 7,742,958
Nonaccrual	21,312	27,937	$ 22,947
Current
Financing Receivable, Past Due [Line Items]
Total	7,896,031	7,703,543
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total	38,403	39,415
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	6,308	5,431
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	10,783	6,047
Commercial Loans \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,824,473	2,708,531
Nonaccrual	2,232	3,228	6,320
Commercial Loans \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,320,652	1,351,637
Nonaccrual	4,460	11,173	878
Commercial Loans \| Commercial construction
Financing Receivable, Past Due [Line Items]
Total	386,239	341,266
Nonaccrual	869	0	4,960
Commercial Loans \| Business banking
Financing Receivable, Past Due [Line Items]
Total	1,319,410	1,303,258
Nonaccrual	3,651	2,988	4,147
Commercial Loans \| Current \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,813,067	2,705,303
Commercial Loans \| Current \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,315,373	1,338,053
Commercial Loans \| Current \| Commercial construction
Financing Receivable, Past Due [Line Items]
Total	385,370	340,230
Commercial Loans \| Current \| Business banking
Financing Receivable, Past Due [Line Items]
Total	1,313,288	1,297,651
Commercial Loans \| Total Past Due Loans \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	11,406	3,228
Commercial Loans \| Total Past Due Loans \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	5,279	13,584
Commercial Loans \| Total Past Due Loans \| Commercial construction
Financing Receivable, Past Due [Line Items]
Total	869	1,036
Commercial Loans \| Total Past Due Loans \| Business banking
Financing Receivable, Past Due [Line Items]
Total	6,122	5,607
Commercial Loans \| 30-59 Days Past Due \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,147	0
Commercial Loans \| 30-59 Days Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	819	415
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	1,281	2,336
Commercial Loans \| 60-89 Days Past Due \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	7,027	0
Commercial Loans \| 60-89 Days Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	1,996
Commercial Loans \| 60-89 Days Past Due \| Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	1,036
Commercial Loans \| 60-89 Days Past Due \| Business banking
Financing Receivable, Past Due [Line Items]
Total	1,190	283
Consumer Loans \| Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,983,483	1,933,509
Nonaccrual	9,916	10,318	6,312
Consumer Loans \| Other consumer
Financing Receivable, Past Due [Line Items]
Total	100,177	104,757
Nonaccrual	184	230	$ 330
Consumer Loans \| Current \| Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,969,296	1,918,150
Consumer Loans \| Current \| Other consumer
Financing Receivable, Past Due [Line Items]
Total	99,637	104,156
Consumer Loans \| Total Past Due Loans \| Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	14,187	15,359
Consumer Loans \| Total Past Due Loans \| Other consumer
Financing Receivable, Past Due [Line Items]
Total	540	601
Consumer Loans \| 30-59 Days Past Due \| Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,731	2,464
Consumer Loans \| 30-59 Days Past Due \| Other consumer
Financing Receivable, Past Due [Line Items]
Total	330	216
Consumer Loans \| 60-89 Days Past Due \| Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,540	2,577
Consumer Loans \| 60-89 Days Past Due \| Other consumer
Financing Receivable, Past Due [Line Items]
Total	$ 26	$ 155