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Investment Securities Narrative (Details) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Security | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 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 | $ 11,510,000 | $ 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 |  | $ 2,263,825,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 2,285,794,000 |  | 2,080,294,000 |  |
Residential Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized cost |  | 331,566,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 329,275,000 |  |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized cost |  | 307,911,000 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 316,334,000 |  |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities pledged as collateral |  | $ 857,100,000 |  | $ 973,400,000 |  |

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