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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2019
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 3,131,227,000 | $ 3,238,395,000
Gross Unrealized Gains |  | 7,934,000 | 35,522,000
Gross Unrealized Losses |  | 55,475,000 | 23,911,000
Securities available-for-sale, at fair value |  | 3,083,686,000 | 3,250,006,000
Available-for-sale, Amortized Cost [Abstract] |  |  |
Due in one year or less |  |  | 63,866,000
Due in one year to five years |  |  | 22,546,000
Due in five years to ten years |  |  | 103,720,000
Due after ten years |  |  | 1,406,074,000
Mortgage-backed securities |  |  | 1,372,248,000
Asset-backed securities |  |  | 269,941,000
Amortized Cost |  |  | 3,238,395,000
Available-for-sale, Fair Value [Abstract] |  |  |
Due in one year or less |  |  | 63,860,000
Due in one year to five years |  |  | 22,533,000
Due in five years to ten years |  |  | 103,272,000
Due after ten years |  |  | 1,431,610,000
Mortgage-backed securities |  |  | 1,359,721,000
Asset-backed securities |  |  | 269,010,000
Securities available-for-sale, at fair value |  | 3,083,686,000 | 3,250,006,000
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  | 179,800,000 |
Net unrealized after tax loss | $ 2,200,000 |  |
Securities held-to-maturity [Abstract] |  |  |
Amortized Cost |  | 194,282,000 | 194,043,000
Gross Unrealized Gains |  | 152,000 | 4,979,000
Gross Unrealized Losses |  | 1,303,000 | 12,000
Securities held-to-maturity, fair value |  | 193,131,000 | 199,010,000
Held-to-maturity, Amortized Cost [Abstract] |  |  |
Due in one year or less |  |  | 325,000
Due in one year to five years |  |  | 5,679,000
Due in five years to ten years |  |  | 7,962,000
Due after ten years |  |  | 180,077,000
Mortgage-backed securities |  |  | 0
Asset-backed securities |  |  | 0
Amortized Cost |  | 194,282,000 | 194,043,000
Held-to-maturity, Fair Value [Abstract] |  |  |
Due in one year or less |  |  | 326,000
Due in one year to five years |  |  | 5,678,000
Due in five years to ten years |  |  | 8,003,000
Due after ten years |  |  | 185,003,000
Mortgage-backed securities |  |  | 0
Asset-backed securities |  |  | 0
Fair Value |  | 193,131,000 | 199,010,000
U.S. Treasury securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 30,325,000 | 48,612,000
Gross Unrealized Gains |  | 0 | 5,000
Gross Unrealized Losses |  | 25,000 | 5,000
Securities available-for-sale, at fair value |  | 30,300,000 | 48,612,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 30,300,000 | 48,612,000
U.S. government agency securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 71,456,000 | 68,219,000
Gross Unrealized Gains |  | 49,000 | 25,000
Gross Unrealized Losses |  | 1,346,000 | 1,275,000
Securities available-for-sale, at fair value |  | 70,159,000 | 66,969,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 70,159,000 | 66,969,000
Mortgage-backed securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 1,336,469,000 | 1,372,248,000
Gross Unrealized Gains |  | 3,110,000 | 3,798,000
Gross Unrealized Losses |  | 28,634,000 | 16,325,000
Securities available-for-sale, at fair value |  | 1,310,945,000 | 1,359,721,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 1,310,945,000 | 1,359,721,000
State and municipal securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 1,244,471,000 | 1,423,313,000
Gross Unrealized Gains |  | 3,785,000 | 30,366,000
Gross Unrealized Losses |  | 18,602,000 | 2,948,000
Securities available-for-sale, at fair value |  | 1,229,654,000 | 1,450,731,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 1,229,654,000 | 1,450,731,000
Asset-backed securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 379,107,000 | 269,941,000
Gross Unrealized Gains |  | 820,000 | 1,026,000
Gross Unrealized Losses |  | 4,345,000 | 1,957,000
Securities available-for-sale, at fair value |  | 375,582,000 | 269,010,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 375,582,000 | 269,010,000
Corporate notes and other |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost |  | 69,399,000 | 56,062,000
Gross Unrealized Gains |  | 170,000 | 302,000
Gross Unrealized Losses |  | 2,523,000 | 1,401,000
Securities available-for-sale, at fair value |  | 67,046,000 | 54,963,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value |  | 67,046,000 | 54,963,000
State and municipal securities |  |  |
Securities held-to-maturity [Abstract] |  |  |
Amortized Cost |  | 194,282,000 | 194,043,000
Gross Unrealized Gains |  | 152,000 | 4,979,000
Gross Unrealized Losses |  | 1,303,000 | 12,000
Securities held-to-maturity, fair value |  | 193,131,000 | 199,010,000
Held-to-maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost |  | 194,282,000 | 194,043,000
Held-to-maturity, Fair Value [Abstract] |  |  |
Fair Value |  | $ 193,131,000 | $ 199,010,000

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