Loans and Allowance for Credit Losses - Schedule of the Company's Loan Participations (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 1,608,268	$ 1,579,059
Non-performing Loan Rate (%)	0.00%	0.00%
Gross Charge-offs	$ 22	$ 22
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 980,353	$ 985,394
Non-performing Loan Rate (%)	0.00%	0.00%
Gross Charge-offs	$ 0	$ 0
Commercial real estate | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 501,033	$ 447,550
Non-performing Loan Rate (%)	0.00%	0.00%
Gross Charge-offs	$ 0	$ 0
Commercial construction | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 126,822	$ 146,043
Non-performing Loan Rate (%)	0.00%	0.00%
Gross Charge-offs	$ 0	$ 0
Business banking | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 60	$ 72
Non-performing Loan Rate (%)	0.00%	0.00%
Gross Charge-offs	$ 22	$ 22