Debt Securities - Additional Information (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) Security	Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Line Items]
Allowance for credit losses on available-for-sale securities	$ 0	$ 0
Amortized Cost	917,048,000	930,439,000
Total investment securities available-for-sale	824,055,000	811,081,000
Unrealized losses	94,439,000	120,178,000
Unrealized losses	737,299,000	760,165,000
Asset Pledged as Collateral [Member] | Public Deposits and Other Required Purposes [Member]
Investments, Debt and Equity Securities [Line Items]
Amortized Cost	532,517,000	500,046,000
Total investment securities available-for-sale	470,882,000	429,705,000
Collateralized Mortgage Obligations [Member]
Investments, Debt and Equity Securities [Line Items]
Amortized Cost	148,569,000	145,179,000
Total investment securities available-for-sale	132,109,000	124,005,000
US Government Sponsored Entities and Agencies [Member]
Investments, Debt and Equity Securities [Line Items]
Allowance for credit losses on available-for-sale securities	0
Total investment securities available-for-sale	11,400,000
Unrealized losses	$ 1,100,000
Percent of mortgage-backed securities	98.00%
Asset-backed Securities [Member]
Investments, Debt and Equity Securities [Line Items]
Amortized Cost	$ 49,143,000	51,183,000
Total investment securities available-for-sale	48,836,000	49,973,000
Unrealized losses	431,000	1,403,000
Unrealized losses	31,628,000	33,166,000
Corporate Debt Securities [Member]
Investments, Debt and Equity Securities [Line Items]
Amortized Cost	2,500,000	2,500,000
Total investment securities available-for-sale	2,396,000	2,423,000
Unrealized losses	104,000	77,000
Unrealized losses	$ 2,396,000	$ 2,423,000
Securities Except U.S. Government and its Agencies [Member]
Investments, Debt and Equity Securities [Line Items]
Number of security holdings greater than 10% percent of shareholders' equity | Security	0