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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment securities:
Available-for-sale	$ 461,372	$ 295,911
Common equity securities	147	138
Held-to-maturity	32,556	7,513
Loans held for sale	997	837
Mortgage servicing rights	846	838
Financial liabilities:
Subordinated debentures	33,000	33,000
Carrying Value
Financial assets:
Cash and due from banks	360,587	228,192
Investment securities:
Available-for-sale	461,372	295,911
Common equity securities	147	138
Held-to-maturity	32,848	7,225
Loans held for sale	997	837
Net loans	2,178,968	2,150,638
Accrued interest receivable	8,280	8,255
Mortgage servicing rights	846	838
Restricted equity securities (FHLB and other)	3,916	5,397
Interest rate floor	1,159	1,678
Interest rate swaps	9,531	13,693
Total assets	3,058,651	2,712,802
Financial liabilities:
Deposits	2,840,919	2,437,113
Long-term debt	3,235	14,769
Subordinated debentures	33,000	33,000
Accrued interest payable	872	736
Interest rate swap	9,277	14,099
Total liabilities	2,887,303	2,499,717
Fair Value
Financial assets:
Cash and due from banks	360,587	228,192
Investment securities:
Available-for-sale	461,372	295,911
Common equity securities	147	138
Held-to-maturity	32,556	7,513
Loans held for sale	997	837
Net loans	2,154,145	2,145,752
Accrued interest receivable	8,280	8,255
Mortgage servicing rights	1,282	1,269
Restricted equity securities (FHLB and other)	3,916	5,397
Interest rate floor	1,159	1,678
Interest rate swaps	9,531	13,693
Total assets	3,033,972	2,708,635
Financial liabilities:
Deposits	2,842,487	2,441,014
Long-term debt	3,336	15,073
Subordinated debentures	32,660	33,096
Accrued interest payable	872	736
Interest rate swap	9,277	14,099
Total liabilities	2,888,632	2,504,018
Level 1
Financial assets:
Cash and due from banks	360,587	228,192
Investment securities:
Available-for-sale	135,397	18,905
Common equity securities	147	138
Level 2
Investment securities:
Available-for-sale	325,975	277,006
Held-to-maturity	32,556	7,513
Loans held for sale	997	837
Accrued interest receivable	8,280	8,255
Mortgage servicing rights	1,282	1,269
Restricted equity securities (FHLB and other)	3,916	5,397
Interest rate floor	1,159	1,678
Interest rate swaps	9,531	13,693
Financial liabilities:
Deposits	2,842,487	2,441,014
Long-term debt	3,336	15,073
Subordinated debentures	32,660	33,096
Accrued interest payable	872	736
Interest rate swap	9,277	14,099
Level 3
Investment securities:
Net loans	$ 2,154,145	$ 2,145,752

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents accrued interest payable as of the balance sheet date.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of financial and nonfinancial obligations.

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