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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 5,828 |
Due from one year to five years | 38,664 |
Due from five years to ten years | 175,654 |
Due after ten years | 390,033 |
Amortized cost, before securities without debt maturities | 610,179 |
Amortized Cost | 2,263,825 |
Estimated Fair Value |  |
Due in one year or less | 5,828 |
Due from one year to five years | 39,900 |
Due from five years to ten years | 178,922 |
Due after ten years | 392,471 |
Available for sale securities, debt maturities, before securities without single maturities | 617,121 |
Estimated Fair Value | 2,285,794 | $ 2,080,294
Amortized Cost |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 2,154 |
Due after ten years | 153,707 |
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total | 155,861 |
Amortized Cost, Held to Maturity | 567,564 | 606,679
Estimated Fair Value |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 2,277 |
Due after ten years | 162,284 |
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value | 164,561 |
Estimated Fair Value, Held to Maturity | 589,728 | 611,419
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 889,053 |
Amortized Cost | 889,053 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 899,117 |
Estimated Fair Value | 899,117 |
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 0 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 433,027 |
Amortized Cost | 433,027 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 440,281 |
Estimated Fair Value | 440,281 |
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 0 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 0 |
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 331,566 |
Amortized Cost | 331,566 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 329,275 |
Estimated Fair Value | 329,275 |
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 411,703 |
Amortized Cost, Held to Maturity | 411,703 | 450,545
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 425,167 |
Estimated Fair Value, Held to Maturity | $ 425,167 | $ 454,212

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