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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Securities available-for-sale | $ 912,429 | $ 1,135,317
Total Fair Value |  |
Assets |  |
State tax credits held for sale | 39,925 | 39,046
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available-for-sale | 15,161 | 10,046
Obligations of states and political subdivisions |  |
Assets |  |
Securities available-for-sale | 344,232 | 213,024
Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 526,572 | 902,021
US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 11,466 | 10,226
Corporate Debt Securities [Member] |  |
Assets |  |
Securities available-for-sale | 14,998 |
Recurring basis | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 912,429 | 1,135,317
Other Investments |  | 0
Derivative financial instruments | 28,703 | 11,055
Assets, Fair Value Disclosure | 941,132 | 1,146,372
Liabilities |  |
Derivative financial instruments | 34,967 | 14,747
Total liabilities | 34,967 | 14,747
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 15,161 | 10,046
Recurring basis | Obligations of states and political subdivisions | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 344,232 | 213,024
Recurring basis | Residential mortgage-backed securities | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 526,572 | 902,021
Recurring basis | US Treasury Bill Securities [Member] | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 11,466 | 10,226
Recurring basis | Corporate Debt Securities [Member] | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 14,998 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available-for-sale | 0 | 0
Other Investments |  | 0
Derivative financial instruments | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Liabilities |  |
Derivative financial instruments | 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) | Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Debt Securities [Member] |  |
Assets |  |
Securities available-for-sale | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available-for-sale | 912,429 | 1,135,317
Other Investments |  | 0
Derivative financial instruments | 28,703 | 11,055
Assets, Fair Value Disclosure | 941,132 | 1,146,372
Liabilities |  |
Derivative financial instruments | 34,967 | 14,747
Total liabilities | 34,967 | 14,747
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available-for-sale | 15,161 | 10,046
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available-for-sale | 344,232 | 213,024
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 526,572 | 902,021
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 11,466 | 10,226
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities [Member] |  |
Assets |  |
Securities available-for-sale | 14,998 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available-for-sale | 0 | 0
Other Investments |  | 0
Derivative financial instruments | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Liabilities |  |
Derivative financial instruments | 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) | Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 0 | $ 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate Debt Securities [Member] |  |
Assets |  |
Securities available-for-sale | $ 0 |

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