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Summary of Significant Accounting Policies (New Accounting Pronouncements Adopted) (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [2]
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New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 10,510 | [1] |  | $ (160)
Operating lease right-of-use assets |  | $ 99,973 |  |  |  |
Operating lease liabilities |  | 108,083 |  |  |  |
Reserve for credit losses including unfunded credit commitments |  | 358,287 |  |  | $ 311,322 |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | 10,510 | [1] |  | $ (545)
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  | 109,100 |  |  |
Operating lease liabilities |  |  | 117,700 |  |  |
Accounting Standards Update 2016-02 | Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 10,500 |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Reserve for credit losses including unfunded credit commitments |  | $ 369,400 |  |  |  |
Accounting Standards Update 2016-13 | Subsequent Event |  |  |  |  |  |
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items] |  |  |  |  |  |
Percentage increase to reserve for credit losses, including unfunded credit commitments | 34.00% |  |  |  |  |
[1] | Represents the impact of the adoption of ASU 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019. Refer to Note 1 — Summary of Significant Accounting Policies and Note 10 — Leases to the Consolidated Financial Statements in this Form 10-K for additional information.
[2] | Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Annual Report on Form 10-K (“this Form 10-K”) for additional information.

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