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Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | $ 1,408,437 | $ 1,296,294
Derivative assets | [1] | 1,914 | 2,444
Derivative liabilities | [1] | 14,355 | 18,249
US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 174,167 | 139,725
State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 436,927 | 568,745
Corporate bonds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 14,359 | 14,093
Residential MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [2] | 778,093 | 568,983
Commercial MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [2] | 4,891 | 4,748
Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans |  | 4,533,772 | 4,481,836
Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans |  | 4,418,820 | 4,198,879
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans |  | 0 | 0
Estimated Fair Value | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans |  | 0 | 0
Estimated Fair Value | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans |  | 4,418,820 | 4,198,879
Fair Value, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investments |  | 5,421 | 5,308
Total asset fair value measurements |  | 1,447,523 | 1,358,241
Total liability fair value measurements |  | 23,806 | 25,684
Fair Value, Recurring | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 174,167 | 139,725
Fair Value, Recurring | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 436,927 | 568,745
Fair Value, Recurring | Corporate bonds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 14,359 | 14,093
Fair Value, Recurring | Residential MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 778,093 | 568,983
Fair Value, Recurring | Commercial MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 4,891 | 4,748
Fair Value, Recurring | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 33,665 | 56,639
Derivative liabilities |  | 23,806 | 25,684
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investments |  | 5,421 | 5,308
Total asset fair value measurements |  | 179,588 | 145,033
Total liability fair value measurements |  | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 174,167 | 139,725
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Derivative liabilities |  | 0 | 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investments |  | 0 | 0
Total asset fair value measurements |  | 1,267,935 | 1,213,208
Total liability fair value measurements |  | 23,806 | 25,684
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 436,927 | 568,745
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 14,359 | 14,093
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Residential MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 778,093 | 568,983
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Commercial MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 4,891 | 4,748
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 33,665 | 56,639
Derivative liabilities |  | 23,806 | 25,684
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investments |  | 0 | 0
Total asset fair value measurements |  | 0 | 0
Total liability fair value measurements |  | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) |  | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Residential MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Commercial MBS |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively) | [3] | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Derivative liabilities |  | 0 | 0
Fair Value, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreclosed assets |  | 402 | 99
Total asset fair value measurements |  | 11,355 | 7,099
Fair Value, Nonrecurring | Collateral Pledged |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans | [4] | 10,953 | 7,000
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreclosed assets |  | 0 | 0
Total asset fair value measurements |  | 0 | 0
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral Pledged |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans | [4] | 0 | 0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreclosed assets |  | 0 | 0
Total asset fair value measurements |  | 0 | 0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral Pledged |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans | [4] | 0 | 0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreclosed assets |  | 402 | 99
Total asset fair value measurements |  | 11,355 | 7,099
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral Pledged |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Collateral-dependent loans | [4] | $ 10,953 | $ 7,000
[1] | Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. At September 30, 2024, we had $1.3 million credit exposure related to interest rate swaps with financial institutions and $649,000 related to interest rate swaps with customers. At December 31, 2023, we had $1.9 million credit exposure related to interest rate swaps with financial institutions and $509,000 related to interest rate swaps with customers. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.
[2] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
[3] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
[4] | Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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