Loans and Allowance for Credit Losses - Loans on Nonaccrual Status and Loans Past Due 90 Days or More and Still Accruing (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	$ 55,558	$ 27,937
End of Period Nonaccrual	49,949	55,558
Nonaccrual With No Related Allowance	19,573	27,521
Interest income recognized on nonaccrual	277	1,699
Commercial loans | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	15,185	3,228
End of Period Nonaccrual	15,125	15,185
Nonaccrual With No Related Allowance	0	14,936
Interest income recognized on nonaccrual	31	123
Commercial loans | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	24,906	11,173
End of Period Nonaccrual	17,909	24,906
Nonaccrual With No Related Allowance	3,375	12,585
Interest income recognized on nonaccrual	111	202
Commercial loans | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	869	0
End of Period Nonaccrual	869	869
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	4	581
Commercial loans | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	3,576	2,988
End of Period Nonaccrual	5,332	3,576
Nonaccrual With No Related Allowance	2,281	0
Interest income recognized on nonaccrual	34	198
Consumer loans | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	10,864	10,318
End of Period Nonaccrual	10,573	10,864
Nonaccrual With No Related Allowance	13,917	0
Interest income recognized on nonaccrual	97	592
Consumer loans | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	158	230
End of Period Nonaccrual	141	158
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	$ 0	$ 3