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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Securities available-for-sale | $ 1,135,317 | $ 721,369
Total Fair Value |  |
Assets |  |
State tax credits held for sale | 39,046 | 39,169
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available-for-sale | 10,046 | 98,498
Obligations of states and political subdivisions |  |
Assets |  |
Securities available-for-sale | 213,024 | 26,810
Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 902,021 | 586,136
US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 10,226 | 9,925
Recurring basis | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 1,135,317 | 721,369
Other Investments |  | 121
Derivative financial instruments | 11,055 | 3,023
Assets, Fair Value Disclosure | 1,146,372 | 724,513
Liabilities |  |
Derivative financial instruments | 14,747 | 3,023
Total liabilities | 14,747 | 3,023
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 10,046 | 98,498
Recurring basis | Obligations of states and political subdivisions | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 213,024 | 26,810
Recurring basis | Residential mortgage-backed securities | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 902,021 | 586,136
Recurring basis | US Treasury Bill Securities [Member] | Total Fair Value |  |
Assets |  |
Securities available-for-sale | 10,226 | 9,925
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available-for-sale | 0 | 0
Other Investments |  | 121
Derivative financial instruments | 0 | 0
Assets, Fair Value Disclosure | 0 | 121
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 | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available-for-sale | 1,135,317 | 721,369
Other Investments |  | 0
Derivative financial instruments | 11,055 | 3,023
Assets, Fair Value Disclosure | 1,146,372 | 724,392
Liabilities |  |
Derivative financial instruments | 14,747 | 3,023
Total liabilities | 14,747 | 3,023
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available-for-sale | 10,046 | 98,498
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available-for-sale | 213,024 | 26,810
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available-for-sale | 902,021 | 586,136
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available-for-sale | 10,226 | 9,925
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

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