Investment Securities - Narrative (Details)	Mar. 31, 2026 USD ($) state company bond security	Dec. 31, 2025 USD ($) security	Mar. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($)	Sep. 30, 2014 USD ($)
Debt Securities, Available-for-sale [Line Items]
AFS allowance	$ 0
HTM allowance for credit losses	145,000	$ 146,000	$ 197,000	$ 196,000
Amortized Cost	$ 354,202,000	$ 356,074,000	$ 368,768,000
Number of securities temporarily impaired (security) | security	232	225	237
Financing receivable, threshold period past due	30 days
Debt securities, held-to-maturity, nonaccrual	$ 0
Amortized cost of securities transferred					$ 89,780,000
Fair value of securities transferred					89,757,000
Net unrealized loss, net of taxes on transferred securities					$ 15,000
Unamortized balance of net unrealized losses transferred	$ 35,000	$ 38,000	$ 45,000
Number of states | state	6
Federal Home Loan Bank Stock	$ 7,277,000	7,238,000	6,472,000
Federal Reserve Bank Stock	1,037,000	1,037,000	1,037,000
Impairment losses	0
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	361,776,000	385,197,000	351,890,000
Agency and mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
HTM allowance for credit losses	$ 0
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Number of private activity bonds | bond	2
Amortized Cost	$ 18,220,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
HTM allowance for credit losses	78,000	78,000	116,000	$ 116,000
Amortized Cost	$ 21,000,000	21,000,000	27,250,000
Number of individual companies | company	11
U.S. Treasury & Agency securities
Debt Securities, Available-for-sale [Line Items]
HTM allowance for credit losses	$ 0
Amortized Cost	$ 38,100,000	$ 38,100,000	$ 38,100,000