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Recent Accounting Pronouncements (Additional Information) (Details) $ in Thousands | Jan. 01, 2020 USD ($) segment | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) segment | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net reduction of retained earnings upon adoption of ASC 326 |  | $ (603,981) | $ (594,674) | $ (583,540) | $ (573,820) | $ (562,927) | $ (499,411) | $ (479,187) | $ (458,640)
Allowance for credit losses | $ 31,931 | 46,768 | 42,431 |  | $ 16,278 | 15,869 | 16,239 |  | 15,823
Number of loan segments | segment | 8 |  |  |  | 6 |  |  |  |
Accrued interest receivable |  | 14,995 |  |  | $ 13,929 |  |  |  |
Impact of adopting ASC 326 - PCD Loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  | 405 |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net reduction of retained earnings upon adoption of ASC 326 |  | $ (272,579) | $ (263,011) | $ (253,780) | (253,090) | $ (241,801) | $ (233,269) | $ (222,246) | $ (211,424)
Impact of ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net reduction of retained earnings upon adoption of ASC 326 |  |  |  |  | 6,717 |  |  |  |
Allowance for credit losses | $ 15,653 |  |  |  |  |  |  |  |
Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses | 6,886 |  |  |  | 6,886 |  |  |  |
Impact of ASC 326 Adoption | Retained Earnings |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net reduction of retained earnings upon adoption of ASC 326 | $ 6,717 |  |  |  | $ 6,717 |  |  |  |

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