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, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	$ 22,947	$ 19,052
End of Period Nonaccrual	33,209	22,947
Nonaccrual With No Related Allowance	21,359	10,516
Interest income recognized on nonaccrual	188	603
Commercial Loans | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	6,320	7,100
End of Period Nonaccrual	17,153	6,320
Nonaccrual With No Related Allowance	16,783	5,940
Interest income recognized on nonaccrual	61	46
Commercial Loans | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	878	283
End of Period Nonaccrual	612	878
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	0	38
Commercial Loans | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	4,960	384
End of Period Nonaccrual	4,960	4,960
Nonaccrual With No Related Allowance	4,576	4,576
Interest income recognized on nonaccrual	0	0
Commercial Loans | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	4,147	4,490
End of Period Nonaccrual	3,907	4,147
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	44	209
Consumer Loans | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	6,312	6,526
End of Period Nonaccrual	6,371	6,312
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	83	308
Consumer Loans | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	330	269
End of Period Nonaccrual	206	330
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	$ 0	$ 2