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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Securities available for sale | $ 1,247,333 | $ 721,369
State tax credits held for sale | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 1,247,333 | 721,369
State tax credits held for sale | 46,981 | 39,169
Derivatives | 13,561 | 3,023
Liabilities |  |
Derivatives | 18,451 | 3,023
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 10,033 | 98,498
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 170,313 | 26,810
Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 934,111 | 586,136
US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 10,247 | 9,925
Corporate Debt Securities [Member] |  |
Assets |  |
Securities available for sale | 122,629 |
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 1,247,333 | 721,369
Other investments | 164 | 121
Derivatives | 13,561 | 3,023
Total assets | 1,261,058 | 724,513
Liabilities |  |
Derivatives |  | 3,023
Total liabilities | 18,451 | 3,023
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 10,033 | 98,498
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 170,313 | 26,810
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 934,111 | 586,136
Recurring basis | US Treasury Bill Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 10,247 | 9,925
Recurring basis | Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 122,629 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available for sale | 0 | 0
Other investments | 164 | 121
Derivatives | 0 | 0
Total assets | 164 | 121
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 | 1,247,333 | 721,369
Other investments | 0 | 0
Derivatives | 13,561 | 3,023
Total assets | 1,260,894 | 724,392
Liabilities |  |
Derivatives | 18,451 | 3,023
Total liabilities | 18,451 | 3,023
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 10,033 | 98,498
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 170,313 | 26,810
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities |  |
Assets |  |
Securities available for sale | 934,111 | 586,136
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 10,247 | 9,925
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities [Member] |  |
Assets |  |
Securities available for sale | 122,629 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 0 | 0
Other investments | 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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