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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,263,825 |
Gross Unrealized Gains | 34,612 |
Gross Unrealized Losses | (12,643) |
Estimated Fair Value | 2,285,794 | $ 2,080,294
Amortized Cost, Held to Maturity | 567,564 | 606,679
Gross Unrealized Gains, Held to Maturity | 22,164 | 4,833
Gross Unrealized Losses, Held to Maturity | 0 | (93)
Held to maturity investment securities | 589,728 | 611,419
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 31,586
Gross Unrealized Gains |  | 185
Gross Unrealized Losses |  | (139)
Estimated Fair Value |  | 31,632
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 307,911 |
Gross Unrealized Gains | 8,508 |
Gross Unrealized Losses | (85) |
Estimated Fair Value | 316,334 |
Amortized Cost, Held to Maturity | 155,861 | 156,134
Gross Unrealized Gains, Held to Maturity | 8,700 | 1,166
Gross Unrealized Losses, Held to Maturity | 0 | (93)
Held to maturity investment securities | 164,561 | 157,207
Amortized Cost |  | 282,383
Gross Unrealized Gains |  | 2,178
Gross Unrealized Losses |  | (5,466)
Estimated Fair Value |  | 279,095
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 194,858 |
Gross Unrealized Gains | 4,885 |
Gross Unrealized Losses | (2,321) |
Estimated Fair Value | 197,422 |
Amortized Cost |  | 111,454
Gross Unrealized Gains |  | 1,432
Gross Unrealized Losses |  | (3,353)
Estimated Fair Value |  | 109,533
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 889,053 |
Gross Unrealized Gains | 12,190 |
Gross Unrealized Losses | (2,126) |
Estimated Fair Value | 899,117 |
Amortized Cost |  | 841,294
Gross Unrealized Gains |  | 2,758
Gross Unrealized Losses |  | (11,972)
Estimated Fair Value |  | 832,080
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 331,566 |
Gross Unrealized Gains | 1,623 |
Gross Unrealized Losses | (3,914) |
Estimated Fair Value | 329,275 |
Amortized Cost, Held to Maturity | 411,703 | 450,545
Gross Unrealized Gains, Held to Maturity | 13,464 | 3,667
Gross Unrealized Losses, Held to Maturity | 0 | 0
Held to maturity investment securities | 425,167 | 454,212
Amortized Cost |  | 476,973
Gross Unrealized Gains |  | 1,583
Gross Unrealized Losses |  | (15,212)
Estimated Fair Value |  | 463,344
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 433,027 |
Gross Unrealized Gains | 7,406 |
Gross Unrealized Losses | (152) |
Estimated Fair Value | 440,281 |
Amortized Cost |  | 264,165
Gross Unrealized Gains |  | 524
Gross Unrealized Losses |  | (3,073)
Estimated Fair Value |  | 261,616
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 107,410 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (4,045) |
Estimated Fair Value | $ 103,365 |
Amortized Cost |  | 107,410
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (4,416)
Estimated Fair Value |  | 102,994
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 2,115,265
Gross Unrealized Gains |  | 8,660
Gross Unrealized Losses |  | (43,631)
Estimated Fair Value |  | $ 2,080,294

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