Long-Term Borrowings and Subordinated Debt - Narrative (Details)	Dec. 31, 2023 USD ($) privatePlacement	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Long-term borrowings at FHLB	$ 39,300,000	$ 14,700,000
Loans pledged as collateral at FHLB	4,600,000,000
Maximum eligible borrowing based on qualifying collateral at FHLB	2,700,000,000
Maximum borrowing capacity at FHLB	$ 3,200,000,000
Number of completed private placements of trust preferred securities | privatePlacement	3
DNB Capital Trust I | Junior subordinated debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 5,000,000
Carrying amount of equity component	$ 200,000
Trusts
Debt Instrument [Line Items]
Percentage of equity owned	100.00%