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General - Narrative (Details) - USD ($) $ in Thousands | Jan. 01, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  | $ 755,877 |  | $ 788,578 |  |  |
Allowance for credit losses - Loans |  | 201,082 | [1] | 130,648 | [1] | $ 99,454 | $ 80,284
Allowance for credit losses on unfunded loan commitments |  | 20,500 |  | 0 |  |  |
Allowance for credit losses |  | 245 |  | 0 |  |  |
State and municipal |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  | 245 |  | 0 |  |  |
Cumulative effect of ASC 326 adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings | $ (68,040) |  |  |  |  |  |
Percent of increase in allowance | 57.00% |  |  |  |  |  |
Allowance for credit losses - Loans | $ 74,055 |  |  | 74,055 |  |  |
Life of loan portfolio | 4 years |  |  |  |  |  |
Allowance for credit losses on unfunded loan commitments | $ 20,500 | 20,500 |  | 20,500 |  |  |
Cumulative effect of ASC 326 adoption | State and municipal |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  | $ 245 |  | $ 245 |  |  |
[1] | Beginning January 1, 2021, the calculation is based on the current expected credit loss methodology. Prior to January 1, 2021, the calculation is based on the incurred loss methodology. See additional details in NOTE 1. GENERAL of these Notes to Consolidated Condensed Financial Statement.

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