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Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets: |  |
Cash and due from banks | $ 75,332,000 | $ 96,323,000
Cash at Federal Reserve and other banks | 35,767,000 | 10,907,000
Securities held to maturity | 139,058,000 | 160,983,000
Restricted equity securities | 0 | 0
Financial liabilities: |  |
Other borrowings | 537,975,000 | 264,605,000
Junior subordinated debt | 101,080,000 | 101,040,000
Level 3 | Overdraft Privilege Commitments |  |
Off-balance sheet: |  |
Contract Amount | 124,392,000 | 126,634,000
Level 3 | Standby letters of credit |  |
Off-balance sheet: |  |
Contract Amount | 38,730,000 | 26,599,000
Level 3 | Commitments |  |
Off-balance sheet: |  |
Contract Amount | 2,268,288,000 | 2,188,560,000
Carrying Amount | Level 1 |  |
Financial assets: |  |
Cash and due from banks | 75,332,000 | 96,323,000
Cash at Federal Reserve and other banks | 35,767,000 | 10,907,000
Carrying Amount | Level 2 |  |
Financial assets: |  |
Securities held to maturity | 139,058,000 | 160,983,000
Restricted equity securities | 17,250,000 | 17,250,000
Financial liabilities: |  |
Deposits | 8,009,643,000 | 8,329,013,000
Other borrowings | 537,975,000 | 264,605,000
Carrying Amount | Level 3 |  |
Financial assets: |  |
Loans, net | 6,592,854,000 | 6,344,767,000
Financial liabilities: |  |
Junior subordinated debt | 101,080,000 | 101,040,000
Fair Value | Level 1 |  |
Financial assets: |  |
Cash and due from banks | 75,332,000 | 96,323,000
Cash at Federal Reserve and other banks | 35,767,000 | 10,907,000
Fair Value | Level 2 |  |
Financial assets: |  |
Securities held to maturity | 124,058,000 | 149,938,000
Financial liabilities: |  |
Deposits | 8,001,633,000 | 8,321,517,000
Other borrowings | 537,975,000 | 264,605,000
Fair Value | Level 3 |  |
Financial assets: |  |
Loans, net | 6,230,247,000 | 6,153,155,000
Financial liabilities: |  |
Junior subordinated debt | 93,600,000 | 92,613,000
Fair Value | Level 3 | Overdraft Privilege Commitments |  |
Off-balance sheet: |  |
Fair Value | 1,244,000 | 1,266,000
Fair Value | Level 3 | Standby letters of credit |  |
Off-balance sheet: |  |
Fair Value | 387,000 | 266,000
Fair Value | Level 3 | Commitments |  |
Off-balance sheet: |  |
Fair Value | $ 22,683,000 | $ 21,886,000

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