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New Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  | $ 238,050 | $ 68,244 |  |  |
Unfunded commitments, allowance for credit loss |  | 22,400 | 8,400 |  |  |
Undivided profits |  | 901,006 | 848,848 |  |  |
Unrealized holding gains (losses) arising during the period on available-for-sale securities |  | 107,382 | 76,109 | $ (13,626) |  |
Right-of-use lease assets |  | 31,348 | 40,675 |  |  |
Lease liability included in other liabilities |  | $ 31,433 | $ 40,854 |  |  |
Impact of ASU 2016-13 adoption |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  | $ 151,400 |
Unfunded commitments, allowance for credit loss |  |  |  |  | 24,000 |
Debt securities, allowance for credit loss |  |  |  |  | 742 |
Undivided profits |  |  |  |  | $ 128,100 |
Accounting Standards Update 2017-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Fair value of HTM municipal bonds | $ 216,400 |  |  |  |  |
Unrealized holding gains (losses) arising during the period on available-for-sale securities | $ 2,500 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Right-of-use lease assets |  |  |  |  |  | $ 32,800
Lease liability included in other liabilities |  |  |  |  |  | $ 32,800

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