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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Federal funds sold | $ 11,343 | $ 3,740
Interest-bearing deposits with other banks | 696,453 | 709,897
Investment securities available-for-sale | 1,445,034 | 1,506,388
Total investment securities held-to-maturity | 878,159 | 901,582
Federal Reserve and Federal Home Loan Bank stock | 54,678 | 25,748
Bank owned life insurance | 113,624 | 112,921
Liabilities |  |
Interest-bearing deposits | 1,207,566 | 997,448
Customer repurchase agreements | 37,059 | 30,587
Carrying Value |  |
Assets |  |
Cash and due from banks | 10,076 | 9,047
Federal funds sold | 11,343 | 3,740
Interest-bearing deposits with other banks | 696,453 | 709,897
Investment securities available-for-sale | 1,445,034 | 1,506,388
Total investment securities held-to-maturity | 1,000,732 | 1,015,737
Federal Reserve and Federal Home Loan Bank stock | 54,678 | 25,748
Loans | 7,982,702 | 7,968,695
Bank owned life insurance | 113,624 | 112,921
Annuity investment | 12,948 | 13,112
Accrued interest receivable | 54,074 | 53,337
Liabilities |  |
Noninterest-bearing deposits | 1,835,524 | 2,279,081
Interest-bearing deposits | 4,442,957 | 4,311,491
Time deposits | 2,222,958 | 2,217,467
Customer repurchase agreements | 37,059 | 30,587
Borrowings | 1,669,948 | 1,369,918
Accrued interest payable | 20,978 | 57,395
Carrying Value | Credit Risk Participation Agreements |  |
Assets |  |
Derivative asset |  | 3
Carrying Value | Interest rate product |  |
Assets |  |
Derivative asset | 34,147 | 30,662
Liabilities |  |
Derivative liability | 33,646 | 30,555
Fair Value |  |
Assets |  |
Cash and due from banks | 10,076 | 9,047
Federal funds sold | 11,343 | 3,740
Interest-bearing deposits with other banks | 696,453 | 709,897
Investment securities available-for-sale | 1,445,034 | 1,506,388
Total investment securities held-to-maturity | 878,159 | 901,582
Loans | 7,596,097 | 7,720,241
Bank owned life insurance | 113,624 | 112,921
Annuity investment | 12,948 | 13,112
Accrued interest receivable | 54,074 | 53,337
Liabilities |  |
Noninterest-bearing deposits | 1,835,524 | 2,279,081
Interest-bearing deposits | 4,442,957 | 4,311,491
Time deposits | 2,217,742 | 2,217,795
Customer repurchase agreements | 37,059 | 30,587
Borrowings | 1,669,043 | 1,368,621
Accrued interest payable | 20,978 | 57,395
Fair Value | Credit Risk Participation Agreements |  |
Assets |  |
Derivative asset |  | 3
Fair Value | Interest rate product |  |
Assets |  |
Derivative asset | 34,147 | 30,662
Liabilities |  |
Derivative liability | 33,646 | 30,555
Fair Value | ​Quoted Prices (Level 1) |  |
Assets |  |
Cash and due from banks | 10,076 | 9,047
Federal funds sold | 0 | 0
Interest-bearing deposits with other banks | 0 | 0
Investment securities available-for-sale | 0 | 0
Total investment securities held-to-maturity | 0 | 0
Federal Reserve and Federal Home Loan Bank stock | 0 | 0
Loans | 0 | 0
Bank owned life insurance | 0 | 0
Annuity investment | 0 | 0
Accrued interest receivable | 54,074 | 53,337
Liabilities |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 0 | 0
Time deposits | 0 | 0
Customer repurchase agreements | 0 | 0
Borrowings | 0 | 0
Accrued interest payable | 20,978 | 57,395
Fair Value | ​Quoted Prices (Level 1) | Credit Risk Participation Agreements |  |
Assets |  |
Derivative asset |  | 0
Fair Value | ​Quoted Prices (Level 1) | Interest rate product |  |
Assets |  |
Derivative asset | 0 | 0
Liabilities |  |
Derivative liability | 0 | 0
Fair Value | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Cash and due from banks | 0 | 0
Federal funds sold | 11,343 | 3,740
Interest-bearing deposits with other banks | 696,453 | 709,897
Investment securities available-for-sale | 1,445,034 | 1,506,388
Total investment securities held-to-maturity | 878,159 | 901,582
Federal Reserve and Federal Home Loan Bank stock | 0 | 0
Loans | 0 | 0
Bank owned life insurance | 113,624 | 112,921
Annuity investment | 12,948 | 13,112
Accrued interest receivable | 0 | 0
Liabilities |  |
Noninterest-bearing deposits | 1,835,524 | 2,279,081
Interest-bearing deposits | 4,442,957 | 4,311,491
Time deposits | 2,217,742 | 2,217,795
Customer repurchase agreements | 37,059 | 30,587
Borrowings | 1,669,043 | 1,368,621
Accrued interest payable | 0 | 0
Fair Value | Significant Other Observable Inputs (Level 2) | Credit Risk Participation Agreements |  |
Assets |  |
Derivative asset |  | 3
Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate product |  |
Assets |  |
Derivative asset | 34,147 | 30,662
Liabilities |  |
Derivative liability | 33,646 | 30,555
Fair Value | Significant Other Unobservable Inputs (Level 3) |  |
Assets |  |
Cash and due from banks | 0 | 0
Federal funds sold | 0 | 0
Interest-bearing deposits with other banks | 0 | 0
Investment securities available-for-sale | 0 | 0
Total investment securities held-to-maturity | 0 | 0
Federal Reserve and Federal Home Loan Bank stock | 0 | 0
Loans | 7,596,097 | 7,720,241
Bank owned life insurance | 0 | 0
Annuity investment | 0 | 0
Accrued interest receivable | 0 | 0
Liabilities |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 0 | 0
Time deposits | 0 | 0
Customer repurchase agreements | 0 | 0
Borrowings | 0 | 0
Accrued interest payable | 0 | 0
Fair Value | Significant Other Unobservable Inputs (Level 3) | Credit Risk Participation Agreements |  |
Assets |  |
Derivative asset |  | 0
Fair Value | Significant Other Unobservable Inputs (Level 3) | Interest rate product |  |
Assets |  |
Derivative asset | 0 | 0
Liabilities |  |
Derivative liability | $ 0 | $ 0

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- Definition The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481309/942-210-45-4 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-10 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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