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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,168,885 |
Gross Unrealized Gains | 16,485 |
Gross Unrealized Losses | (25,564) |
Estimated Fair Value | 2,159,806 | $ 2,080,294
Amortized Cost, Held to Maturity | 588,443 | 606,679
Gross Unrealized Gains, Held to Maturity | 15,164 | 4,833
Gross Unrealized Losses, Held to Maturity | 0 | (93)
Held to maturity investment securities | 603,607 | 611,419
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 26,900 |
Gross Unrealized Gains | 624 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 27,524 |
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 | 293,116 |
Gross Unrealized Gains | 5,840 |
Gross Unrealized Losses | (1,272) |
Estimated Fair Value | 297,684 |
Amortized Cost, Held to Maturity | 155,998 | 156,134
Gross Unrealized Gains, Held to Maturity | 5,710 | 1,166
Gross Unrealized Losses, Held to Maturity | 0 | (93)
Held to maturity investment securities | 161,708 | 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 | 122,006 |
Gross Unrealized Gains | 1,610 |
Gross Unrealized Losses | (2,328) |
Estimated Fair Value | 121,288 |
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 | 889,046 |
Gross Unrealized Gains | 5,561 |
Gross Unrealized Losses | (7,202) |
Estimated Fair Value | 887,405 |
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 | 447,924 |
Gross Unrealized Gains | 1,530 |
Gross Unrealized Losses | (8,596) |
Estimated Fair Value | 440,858 |
Amortized Cost, Held to Maturity | 432,445 | 450,545
Gross Unrealized Gains, Held to Maturity | 9,454 | 3,667
Gross Unrealized Losses, Held to Maturity | 0 | 0
Held to maturity investment securities | 441,899 | 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 | 282,483 |
Gross Unrealized Gains | 1,320 |
Gross Unrealized Losses | (1,566) |
Estimated Fair Value | 282,237 |
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 | (4,600) |
Estimated Fair Value | $ 102,810 |
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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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