Investment Securities - Schedule of Unrealized Loss Positions (Details) $ in Thousands	Sep. 30, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 13,855	$ 3,172
Less than 12 months, unrealized loss	(906)	(77)
12 months or more, fair value	275,434	293,311
12 months or more, unrealized loss	$ (25,163)	$ (33,412)
United States government agency securities
Description and Number of Positions
Number of investments in an unrealized loss position \| loan	23	25
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 302	$ 316
Less than 12 months, unrealized loss	(1)	0
12 months or more, fair value	34,215	34,619
12 months or more, unrealized loss	$ (4,184)	$ (5,603)
United States sponsored mortgage-backed securities
Description and Number of Positions
Number of investments in an unrealized loss position \| loan	48	47
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 4,842	$ 0
Less than 12 months, unrealized loss	(78)	0
12 months or more, fair value	48,286	50,345
12 months or more, unrealized loss	$ (8,869)	$ (10,549)
United States treasury securities
Description and Number of Positions
Number of investments in an unrealized loss position \| loan	23	23
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 0	$ 0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	103,241	100,354
12 months or more, unrealized loss	$ (2,931)	$ (6,045)
Municipal securities
Description and Number of Positions
Number of investments in an unrealized loss position \| loan	191	216
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 8,711	$ 847
Less than 12 months, unrealized loss	(827)	(10)
12 months or more, fair value	86,256	106,060
12 months or more, unrealized loss	$ (9,032)	$ (11,148)
Corporate debt securities
Description and Number of Positions
Number of investments in an unrealized loss position \| loan	6	7
Investments in an Unrealized Loss Position
Less than 12 months, fair value	$ 0	$ 2,009
Less than 12 months, unrealized loss	0	(67)
12 months or more, fair value	3,436	1,933
12 months or more, unrealized loss	$ (147)	$ (67)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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