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Disclosures About Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | $ 2,405,568 | $ 1,919,119
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 2,403,422 | 1,916,640
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 2,146 | 2,479
Recurring | Interest rate swap liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap liability | 50,284 | 76,353
Recurring | U.S. Treasury |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,000 |
Recurring | U.S. Government-sponsored agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 11,381 | 2,430
Recurring | State and municipal |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,366,162 | 1,257,885
Recurring | U.S. Government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,022,863 | 654,669
Recurring | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 4,162 | 4,135
Recurring | Interest rate swap asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap asset | 48,576 | 74,335
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap liability | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government-sponsored agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap asset | 0 | 0
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap liability | 50,284 | 76,353
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,000 |
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 11,381 | 2,430
Recurring | Significant Other Observable Inputs (Level 2) | State and municipal |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,364,051 | 1,255,441
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 1,022,859 | 654,665
Recurring | Significant Other Observable Inputs (Level 2) | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 4,131 | 4,104
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap asset | 48,576 | 74,335
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap liability |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap liability | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government-sponsored agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | State and municipal |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 2,111 | 2,444
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 4 | 4
Recurring | Significant Unobservable Inputs (Level 3) | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities available for sale | 31 | 31
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap asset |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap asset | $ 0 | $ 0

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