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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Securities available for sale | $ 1,219,814 | $ 912,429
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Other investments | 59,156 | 48,764
State tax credits held for sale | 41,306 | 39,925
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 114,937 | 15,161
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 515,416 | 344,232
Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 505,766 | 526,572
U.S. Treasury bills |  |
Assets |  |
Securities available for sale | 71,292 | 11,466
Corporate debt securities |  |
Assets |  |
Securities available for sale | 12,403 | 14,998
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 1,219,814 | 912,429
Other investments | 2,999 |
Derivatives | 17,442 | 28,703
Total assets | 1,240,255 | 941,132
Liabilities |  |
Derivatives | 21,428 | 34,967
Total liabilities | 21,428 | 34,967
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 114,937 | 15,161
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 515,416 | 344,232
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 505,766 | 526,572
Recurring basis | U.S. Treasury bills | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 71,292 | 11,466
Recurring basis | Corporate debt securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 12,403 | 14,998
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available for sale | 0 | 0
Other investments | 217 |
Derivatives | 0 | 0
Total assets | 217 | 0
Liabilities |  |
Derivatives | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury bills |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available for sale | 1,219,814 | 912,429
Other investments | 2,782 |
Derivatives | 17,442 | 28,703
Total assets | 1,240,038 | 941,132
Liabilities |  |
Derivatives | 21,428 | 34,967
Total liabilities | 21,428 | 34,967
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 114,937 | 15,161
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 515,416 | 344,232
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 505,766 | 526,572
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury bills |  |
Assets |  |
Securities available for sale | 71,292 | 11,466
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets |  |
Securities available for sale | 12,403 | 14,998
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 0 | 0
Other investments | 0 |
Derivatives | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Treasury bills |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Assets |  |
Securities available for sale | $ 0 | $ 0

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