Debt Securities - Gross Unrealized Losses and Fair Value of Investments (Details) $ in Thousands	Sep. 30, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	$ 33,559	$ 16,764
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 186	$ 121
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	10	10
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 703,740	$ 743,401
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 94,253	$ 120,057
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	464	498
Available-for-Sale Securities, Total, Fair Value	$ 737,299	$ 760,165
Available-for-Sale Securities, Total, Unrealized Losses	94,439	120,178
U.S. Treasury and Other U.S. Government Agencies [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	0	0
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 4,586	$ 4,429
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 335	$ 472
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	2	2
Available-for-Sale Securities, Total, Fair Value	$ 4,586	$ 4,429
Available-for-Sale Securities, Total, Unrealized Losses	335	472
U.S. Government-sponsored Enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	0	0
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 151,986	$ 144,169
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 17,677	$ 23,570
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	67	55
Available-for-Sale Securities, Total, Fair Value	$ 151,986	$ 144,169
Available-for-Sale Securities, Total, Unrealized Losses	17,677	23,570
Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	21,309	8,889
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 148	$ 63
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	4	7
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 369,532	$ 390,557
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 52,020	$ 63,896
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	217	221
Available-for-Sale Securities, Total, Fair Value	$ 390,841	$ 399,446
Available-for-Sale Securities, Total, Unrealized Losses	52,168	63,959
Asset-backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	11,915	2,500
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 22	$ 44
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	4	1
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 19,713	$ 30,666
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 409	$ 1,359
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	11	26
Available-for-Sale Securities, Total, Fair Value	$ 31,628	$ 33,166
Available-for-Sale Securities, Total, Unrealized Losses	431	1,403
Corporate Bonds [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	0	0
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 2,396	$ 2,423
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 104	$ 77
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	1	1
Available-for-Sale Securities, Total, Fair Value	$ 2,396	$ 2,423
Available-for-Sale Securities, Total, Unrealized Losses	104	77
Obligations of States and Political Subdivisions
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	335	5,375
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 16	$ 14
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included | Security	2	2
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 155,527	$ 171,157
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 23,708	$ 30,683
Available-for-Sale Securities, 12 Months or More, Number of Securities Included | Security	166	193
Available-for-Sale Securities, Total, Fair Value	$ 155,862	$ 176,532
Available-for-Sale Securities, Total, Unrealized Losses	$ 23,724	$ 30,697