Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 7,742,958	$ 7,653,341
Nonaccrual	27,937	22,947	$ 19,052
Current
Financing Receivable, Past Due [Line Items]
Total	7,703,543	7,615,273
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total	39,415	38,068
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	5,431	7,247
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	6,047	7,874
Commercial Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,708,531	2,659,135
Nonaccrual	3,228	6,320	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,351,637	1,436,183
Nonaccrual	11,173	878	283
Commercial Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	341,266	350,583
Nonaccrual	0	4,960	384
Commercial Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,303,258	1,360,765
Nonaccrual	2,988	4,147	4,490
Commercial Loans | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,705,303	2,649,412
Commercial Loans | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,338,053	1,435,301
Commercial Loans | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	340,230	345,623
Commercial Loans | Current | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,297,651	1,351,048
Commercial Loans | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	3,228	9,723
Commercial Loans | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	13,584	882
Commercial Loans | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	1,036	4,960
Commercial Loans | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	5,607	9,717
Commercial Loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	415	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	2,336	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	1,996	0
Commercial Loans | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	1,036	0
Commercial Loans | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	283	2,045
Consumer Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,933,509	1,731,778
Nonaccrual	10,318	6,312	6,526
Consumer Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	104,757	114,897
Nonaccrual	230	330	$ 269
Consumer Loans | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,918,150	1,719,751
Consumer Loans | Current | Other consumer
Financing Receivable, Past Due [Line Items]
Total	104,156	114,138
Consumer Loans | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	15,359	12,027
Consumer Loans | Total Past Due Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	601	759
Consumer Loans | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,464	3,352
Consumer Loans | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	216	366
Consumer Loans | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,577	2,363
Consumer Loans | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	$ 155	$ 63