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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement [Line Items] |  |
Amortized Cost | $ 2,115,265 |
Estimated Fair Value | 2,080,294 | $ 2,547,956
Amortized Cost | 606,679 | 0
Held to maturity investment securities | 611,419 |
Amortized Cost |  | 2,575,719
Gross Unrealized Gains |  | 13,062
Gross Unrealized Losses |  | (40,825)
Estimated Fair Value |  | 2,547,956
U.S. Government sponsored agency securities |  |
Statement [Line Items] |  |
Amortized Cost | 31,586 |
Gross Unrealized Gains | 185 |
Gross Unrealized Losses | (139) |
Estimated Fair Value | 31,632 |
Amortized Cost |  | 5,962
Gross Unrealized Gains |  | 2
Gross Unrealized Losses |  | (26)
Estimated Fair Value |  | 5,938
State and municipal securities |  |
Statement [Line Items] |  |
Amortized Cost | 282,383 |
Gross Unrealized Gains | 2,178 |
Gross Unrealized Losses | (5,466) |
Estimated Fair Value | 279,095 |
Amortized Cost | 156,134 |
Gross Unrealized Gains | 1,166 |
Gross Unrealized Losses | (93) |
Held to maturity investment securities | 157,207 |
Amortized Cost |  | 405,860
Gross Unrealized Gains |  | 5,638
Gross Unrealized Losses |  | (2,549)
Estimated Fair Value |  | 408,949
Corporate debt securities |  |
Statement [Line Items] |  |
Amortized Cost | 111,454 |
Gross Unrealized Gains | 1,432 |
Gross Unrealized Losses | (3,353) |
Estimated Fair Value | 109,533 |
Amortized Cost |  | 96,353
Gross Unrealized Gains |  | 2,832
Gross Unrealized Losses |  | (1,876)
Estimated Fair Value |  | 97,309
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Amortized Cost | 841,294 |
Gross Unrealized Gains | 2,758 |
Gross Unrealized Losses | (11,972) |
Estimated Fair Value | 832,080 |
Amortized Cost |  | 611,927
Gross Unrealized Gains |  | 491
Gross Unrealized Losses |  | (9,795)
Estimated Fair Value |  | 602,623
Residential mortgage-backed securities |  |
Statement [Line Items] |  |
Amortized Cost | 476,973 |
Gross Unrealized Gains | 1,583 |
Gross Unrealized Losses | (15,212) |
Estimated Fair Value | 463,344 |
Amortized Cost | 450,545 |
Gross Unrealized Gains | 3,667 |
Gross Unrealized Losses | 0 |
Held to maturity investment securities | 454,212 |
Amortized Cost |  | 1,132,080
Gross Unrealized Gains |  | 3,957
Gross Unrealized Losses |  | (15,241)
Estimated Fair Value |  | 1,120,796
Commercial mortgage-backed securities |  |
Statement [Line Items] |  |
Amortized Cost | 264,165 |
Gross Unrealized Gains | 524 |
Gross Unrealized Losses | (3,073) |
Estimated Fair Value | 261,616 |
Amortized Cost |  | 215,351
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (2,596)
Estimated Fair Value |  | 212,755
Auction rate securities |  |
Statement [Line Items] |  |
Amortized Cost | 107,410 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (4,416) |
Estimated Fair Value | 102,994 |
Amortized Cost |  | 107,410
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (8,742)
Estimated Fair Value |  | 98,668
Debt securities |  |
Statement [Line Items] |  |
Amortized Cost | 2,115,265 |
Gross Unrealized Gains | 8,660 |
Gross Unrealized Losses | (43,631) |
Estimated Fair Value | 2,080,294 |
Amortized Cost | 606,679 |
Gross Unrealized Gains | 4,833 |
Gross Unrealized Losses | (93) |
Held to maturity investment securities | $ 611,419 |
Amortized Cost |  | 2,574,943
Gross Unrealized Gains |  | 12,920
Gross Unrealized Losses |  | (40,825)
Estimated Fair Value |  | 2,547,038
Equity securities |  |
Statement [Line Items] |  |
Amortized Cost |  | 776
Gross Unrealized Gains |  | 142
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | $ 918

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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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