Fair value of financial instruments (Details) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) Office security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities \| security		35
Aggregate amortized cost	$ 450,454	$ 575,288
Available for sale, Fair Value	398,927	$ 526,329
Fair value of assets transfers into level 3	0
Fair value of assets transfers out of level 3	0
Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities \| security		3
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale, Fair Value		$ 4,622
Level 3 \| Other Assets.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	0	748
Level 3 \| Residential real estate property \| Other Assets.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned		$ 27
Number of residential real estate properties \| Office		1
Level 3 \| Former community banking office \| Other Assets.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned		$ 711
Number of former community banking office properties \| Office		1
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate amortized cost	4,000	$ 31,442
Available for sale, Fair Value	$ 3,730	31,621
Corporate debt securities \| Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate amortized cost		4,300
Corporate debt securities \| Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale, Fair Value		31,600
Corporate debt securities \| Recurring Basis \| Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale, Fair Value		$ 4,600

The number of corporate debt securities owned by the company.

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- Definition

Represents the number of former community banking office properties.

+ References

No definition available.

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- Definition

Represents the number of residential real estate properties.

+ References

No definition available.

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- Definition

Fair value disclosure of other real estate owned at the end of the period.

+ References

No definition available.

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Paragraph 1
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- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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