Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) security chargeoff	Dec. 31, 2022 USD ($)	Jan. 01, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt securities, accrued interest	$ 1,800,000	$ 2,000,000
Held to maturity, allowance for credit losses	$ 80,000	0	$ 100,000
Number of debt securities with unrealized losses | security	164
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis	17.20%
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio	17.00%
Securities In Unrealized Loss Positions More Than Twelve Months Qualitative Disclosure Number Of Positions | security	150
Debt securities in a continuous loss position for over 12 months, amortized cost basis	$ 395,300,000
Debt securities in a continuous loss position for over 12 months, unrealized loss	69,100,000
Provision for loan losses	3,714,000	3,656,000
Gross realized gains on sales of securities	0	100,000
Gross realized losses	0	100,000
Tax (benefit) provision applicable to these realized net (losses)/gains	0	3,000
Proceeds from sales of securities	0	3,100,000
Net unrealized gains (losses) on available-for-sale securities included in AOCI , net of applicable income taxes	13,000,000	15,200,000
Losses reclassified out of AOCI into earnings, net of tax	$ 0	13,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, held-to-maturity, number of chargeoffs | chargeoff	1
Debt securities, held-to-maturity, excluding accrued interest, allowance for credit loss, writeoff	$ 100,000
Held-to-Maturity and Available-for-Sale Securities
Debt Securities, Available-for-sale [Line Items]
Provision for loan losses	100,000
Deposits
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale and held-to-maturity, fair value	$ 192,200,000	$ 260,800,000