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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Unit shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 shares | Jan. 01, 2020 USD ($)
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Maximum refinement period of fair values after closing date of acquisition | 1 year |  |  |
Allowance for loan losses |  | $ 195,225 |  |
Loan minimum balance included in specific reserve analysis | $ 1 |  |  |
Number of reporting units | Unit | 1 |  |  |
Tax credit carry back period | 1 year |  |  |
Tax credit carry forward period | 20 years |  |  |
Weighted-average anti-dilutive potential common shares | shares | 0 | 15,815 | 5,129 |
Federal NMTC Investment [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Tax credit earning period | 7 years |  |  |
Low Income Housing Credit Investments [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Tax credit earning period | 10 years |  |  |
Minimum [Member] | State NMTC Investment [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Tax credit earning period | 3 years |  |  |
Maximum [Member] | State NMTC Investment [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Tax credit earning period | 5 years |  |  |
Buildings [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Estimated useful lives of assets | 30 years |  |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Estimated useful lives of assets | 3 years |  |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Estimated useful lives of assets | 10 years |  |  |
Software [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Amortization Expense Charged Off Period | 3 years |  |  |
Core Systems [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Amortization Expense Charged Off Period | 7 years |  |  |
Topic 326 [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |  |
Allowance for loan losses |  |  |  | $ 271,966
Change in accounting principle, accounting standards update, immaterial effect | true |  |  |
ASU 2018-13 [Member] |  |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |  |

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