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Fair Value of Assets and Liabilities - Summary of Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | $ 693,873 |  | $ 683,895 |  |  |  |
Fair Value |  | 636,529 |  | 612,022 |  |  |  |
Loans and leases, net of deferred fees and costs | [1] | 6,271,839 |  | 6,159,196 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Debt securities held to maturity, allowance for credit loss |  | 236 |  | 238 |  |  |  |
Allowance for credit losses (on PCD loans) |  | 66,639 | $ 66,247 | 62,011 |  | $ 62,924 | $ 61,211 | $ 53,162
Carrying Amount |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 693,873 |  | 683,895 |  |  |  |
Federal Home Loan Bank ("FHLB") stock |  | 20,245 |  | 29,949 |  |  |  |
Federal Reserve Bank ("FRB") stock |  | 27,114 |  | 26,896 |  |  |  |
Total other investment securities at cost |  | 47,359 |  | 56,845 |  |  |  |
Total other investment securities |  | 55,263 |  | 62,992 |  |  |  |
Carrying Amount | Level 1 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 283,707 |  | 426,722 |  |  |  |
Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Bank owned life insurance |  | 143,065 |  | 140,554 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Deposits |  | 7,483,157 |  | 7,152,297 |  |  |  |
Short-term borrowings |  | 175,945 |  | 601,121 |  |  |  |
Long-term borrowings |  | 236,824 |  | 216,241 |  |  |  |
Carrying Amount | Level 3 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Loans and leases, net of deferred fees and costs |  | 6,271,839 |  | 6,159,196 | [1] |  |  |
Fair Value |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Fair Value |  | 636,529 |  | 612,022 |  |  |  |
Federal Home Loan Bank ("FHLB") stock |  | 20,245 |  | 29,949 |  |  |  |
Federal Reserve Bank ("FRB") stock |  | 27,114 |  | 26,896 |  |  |  |
Total other investment securities at cost |  | 47,359 |  | 56,845 |  |  |  |
Total other investment securities |  | 55,263 |  | 62,992 |  |  |  |
Fair Value | Level 1 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 283,707 |  | 426,722 |  |  |  |
Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Bank owned life insurance |  | 143,065 |  | 140,554 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Deposits |  | 6,811,258 |  | 6,319,885 |  |  |  |
Short-term borrowings |  | 187,869 |  | 619,999 |  |  |  |
Long-term borrowings |  | 252,873 |  | 222,743 |  |  |  |
Fair Value | Level 3 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Loans and leases, net of deferred fees and costs, fair value |  | 6,229,349 |  | 6,064,999 |  |  |  |
U.S. government sponsored agencies |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 196,642 |  | 188,475 |  |  |  |
Fair Value |  | 191,610 |  | 180,825 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Debt securities held to maturity, allowance for credit loss |  | 0 |  | 0 |  |  |  |
U.S. government sponsored agencies | Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 196,642 |  | 188,475 |  |  |  |
U.S. government sponsored agencies | Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Fair Value |  | 191,610 |  | 180,825 |  |  |  |
States and political subdivisions |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 141,918 |  | 144,496 |  |  |  |
Fair Value |  | 115,674 |  | 114,288 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Debt securities held to maturity, allowance for credit loss |  | 236 |  | 238 |  |  |  |
States and political subdivisions | Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 141,918 |  | 144,496 |  |  |  |
States and political subdivisions | Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Fair Value |  |  |  | 114,288 |  |  |  |
Residential mortgage-backed securities |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 256,329 |  | 248,559 |  |  |  |
Fair Value |  | 243,499 |  | 231,620 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Debt securities held to maturity, allowance for credit loss |  | 0 |  | 0 |  |  |  |
Residential mortgage-backed securities | Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 256,329 |  | 248,559 |  |  |  |
Residential mortgage-backed securities | Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Fair Value |  | 243,499 |  | 231,620 |  |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 98,984 |  | 102,365 |  |  |  |
Fair Value |  | 85,746 |  | 85,289 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Debt securities held to maturity, allowance for credit loss |  | 0 |  | 0 |  |  |  |
Commercial mortgage-backed securities | Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Carrying Amount |  | 98,984 |  | 102,365 |  |  |  |
Commercial mortgage-backed securities | Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Fair Value |  | 85,746 |  | 85,289 |  |  |  |
Nonqualified Plan | Carrying Amount | Level 1 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total other investment securities |  | 4,729 |  | 3,162 |  |  |  |
Nonqualified Plan | Fair Value | Level 1 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total other investment securities |  | 4,729 |  | 3,162 |  |  |  |
Other investment securities | Carrying Amount | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total other investment securities |  | 3,175 |  | 2,985 |  |  |  |
Other investment securities | Fair Value | Level 2 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total other investment securities |  | $ 3,175 |  | $ 2,985 |  |  |  |
[1] | Also referred to throughout this Quarterly Report on Form 10-Q as "total loans" and "loans held for investment."

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