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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 9,252 |
Due from one year to five years | 55,635 |
Due from five years to ten years | 120,920 |
Due after ten years | 363,625 |
Amortized cost, before securities without debt maturities | 549,432 |
Amortized Cost | 2,168,885 |
Estimated Fair Value |  |
Due in one year or less | 9,256 |
Due from one year to five years | 57,030 |
Due from five years to ten years | 120,605 |
Due after ten years | 362,415 |
Available for sale securities, debt maturities, before securities without single maturities | 549,306 |
Estimated Fair Value | 2,159,806 | $ 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 | 0 |
Due after ten years | 155,998 |
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total | 155,998 |
Amortized Cost, Held to Maturity | 588,443 | 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 | 0 |
Due after ten years | 161,708 |
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value | 161,708 |
Estimated Fair Value, Held to Maturity | 603,607 | 611,419
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 889,046 |
Amortized Cost | 889,046 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 887,405 |
Estimated Fair Value | 887,405 |
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 | 282,483 |
Amortized Cost | 282,483 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 282,237 |
Estimated Fair Value | 282,237 |
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 | 447,924 |
Amortized Cost | 447,924 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 440,858 |
Estimated Fair Value | 440,858 |
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 432,445 |
Amortized Cost, Held to Maturity | 432,445 | 450,545
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 441,899 |
Estimated Fair Value, Held to Maturity | $ 441,899 | $ 454,212

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