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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Securities available for sale | $ 998,104 | $ 1,135,317
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
State tax credits held for sale | 44,164 | 39,046
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 10,241 | 10,046
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 254,278 | 213,024
Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 720,991 | 902,021
US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 10,566 | 10,226
Corporate Debt Securities [Member] |  |
Assets |  |
Securities available for sale | 2,028 |
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 998,104 | 1,135,317
Derivatives | 35,728 | 11,055
Total assets | 1,033,832 | 1,146,372
Liabilities |  |
Derivatives | 46,828 | 14,747
Total liabilities | 46,828 | 14,747
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 10,241 | 10,046
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 254,278 | 213,024
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 720,991 | 902,021
Recurring basis | US Treasury Bill Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 10,566 | 10,226
Recurring basis | Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 2,028 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available for sale | 0 | 0
Derivatives | 0 | 0
Total assets | 0 | 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) | 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 | 998,104 | 1,135,317
Derivatives | 35,728 | 11,055
Total assets | 1,033,832 | 1,146,372
Liabilities |  |
Derivatives | 46,828 | 14,747
Total liabilities | 46,828 | 14,747
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 10,241 | 10,046
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 254,278 | 213,024
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 720,991 | 902,021
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 10,566 | 10,226
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities [Member] |  |
Assets |  |
Securities available for sale | 2,028 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 0 | 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) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | $ 0 | $ 0

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