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Short-term borrowings - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Short-term borrowings |  |
Maximum borrowing capacity | $ 18,000 | $ 18,000
Outstanding amount in borrowings | 0 | 0
Net loans | 2,828,002 |
Total investment securities | 483,876 | 568,992
FHLB Advances |  |
Short-term borrowings |  |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | 1,200 |
Federal Reserve Bank Advances |  |
Short-term borrowings |  |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | 246,100 |
Assets pledged as collateral | FHLB Advances |  |
Short-term borrowings |  |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | 1,200,000 | 1,200,000
Net loans | 1,800,000 | 1,600,000
Assets pledged as collateral | Federal Reserve Bank Advances |  |
Short-term borrowings |  |
Net loans | 365,800 |
Assets pledged as collateral | Borrow in Custody Program |  |
Short-term borrowings |  |
Net loans | 365,800 | 349,900
Assets pledged as collateral | Bank Term Funding Program |  |
Short-term borrowings |  |
Total investment securities | 191,000 |
Assets pledged as collateral | Discount Window |  |
Short-term borrowings |  |
Total investment securities | 11 | 24
Federal Reserve Bank Discount Window |  |
Short-term borrowings |  |
Maximum borrowing capacity | 257,400 |
Bank Term Funding Program |  |
Short-term borrowings |  |
Maximum borrowing capacity | 191,000 |
Borrow in Custody Program |  |
Short-term borrowings |  |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | 246,100 | $ 232,200
Peoples Bank |  |
Short-term borrowings |  |
Maximum borrowing capacity | 1,200,000 |
Outstanding amount in borrowings | 25,000 |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | $ 345,400 |

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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