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Investment Securities Narrative (Details) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Security | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 11,510,000 | $ 990,000 | $ 990,000 | $ 11,510,000 | $ 11,510,000 | $ 11,510,000
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings | $ 0 |  |  |  |  |
Number of Held to Maturity investments in unrealized loss position | Security |  | 0 |  |  |  |
Amortized cost |  | $ 2,274,913,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 2,315,541,000 |  | 2,080,294,000 |  |
Residential Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized cost |  | 183,696,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 183,785,000 |  |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized cost |  | 530,448,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 547,344,000 |  |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities pledged as collateral |  | $ 391,500,000 |  | $ 973,400,000 |  |

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