Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Unrealized losses resulting in deferred tax asset	$ 212,700,000	$ 247,400,000
Deferred tax assets from unrealized losses on certain investments in debt securities	50,817,000	59,392,000
Net deferred tax assets	113,232,000	94,457,000
Deferred tax assets	113,232,000	94,457,000
Accrual for income tax interest or penalties	0
Income tax benefit related to share-based compensation	500,000	1,100,000	$ 900,000
Amortization reflected as income expense related to affordable housing project investments	2,800,000	2,500,000	1,600,000
Affordable housing project tax credits	2,700,000	2,000,000	1,200,000
Affordable housing project tax benefits	1,500,000	1,000,000	$ 700,000
Carrying value of affordable housing tax credits	39,500,000	27,300,000
Affordable housing tax credits, unfunded amounts	26,300,000	17,600,000
Unrecognized income tax benefits	0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	91,000,000
Deferred tax assets	2,700,000	76,800,000
State
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	22,200,000
Deferred tax assets	$ 1,100,000	$ 17,700,000