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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | $ 3,337,991 |  | $ 3,146,023
Gross Unrealized Gains |  | 75,677 |  | 5,275
Gross Unrealized Losses |  | 20,233 |  | 67,612
Securities available-for-sale, at fair value |  | 3,393,435 |  | 3,083,686
Available-for-sale, Amortized Cost [Abstract] |  |  |  |
Due in one year or less |  | 63,488 |  |
Due in one year to five years |  | 16,772 |  |
Due in five years to ten years |  | 106,774 |  |
Due after ten years |  | 1,668,670 |  |
Mortgage-backed securities |  | 1,318,953 |  |
Asset-backed securities |  | 163,334 |  |
Amortized Cost |  | 3,337,991 |  |
Available-for-sale, Fair Value [Abstract] |  |  |  |
Due in one year or less |  | 63,507 |  |
Due in one year to five years |  | 16,986 |  |
Due in five years to ten years |  | 107,322 |  |
Due after ten years |  | 1,708,370 |  |
Mortgage-backed securities |  | 1,334,517 |  |
Asset-backed securities |  | 162,733 |  |
Securities available-for-sale, at fair value |  | 3,393,435 |  | 3,083,686
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  | 0 | $ 179,763 | 179,800
Net unrealized after tax loss | $ 2,200 |  |  |
Securities held-to-maturity [Abstract] |  |  |  |
Amortized Cost |  | 189,684 |  | 194,282
Gross Unrealized Gains |  | 13,137 |  | 152
Gross Unrealized Losses |  | 0 |  | 1,303
Securities held-to-maturity, fair value |  | 202,821 |  | 193,131
Held-to-maturity, Amortized Cost [Abstract] |  |  |  |
Due in one year or less |  | 1,394 |  |
Due in one year to five years |  | 0 |  |
Due in five years to ten years |  | 5,775 |  |
Due after ten years |  | 182,515 |  |
Mortgage-backed securities |  | 0 |  |
Asset-backed securities |  | 0 |  |
Amortized Cost |  | 189,684 |  | 194,282
Held-to-maturity, Fair Value [Abstract] |  |  |  |
Due in one year or less |  | 1,394 |  |
Due in one year to five years |  | 0 |  |
Due in five years to ten years |  | 5,877 |  |
Due after ten years |  | 195,550 |  |
Mortgage-backed securities |  | 0 |  |
Asset-backed securities |  | 0 |  |
Fair Value |  | 202,821 |  | 193,131
U.S. Treasury securities |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 48,635 |  | 30,325
Gross Unrealized Gains |  | 31 |  | 0
Gross Unrealized Losses |  | 4 |  | 25
Securities available-for-sale, at fair value |  | 48,662 |  | 30,300
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 48,662 |  | 30,300
U.S. government agency securities |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 92,668 |  | 71,456
Gross Unrealized Gains |  | 412 |  | 49
Gross Unrealized Losses |  | 834 |  | 1,346
Securities available-for-sale, at fair value |  | 92,246 |  | 70,159
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 92,246 |  | 70,159
Mortgage-backed securities |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 1,318,953 |  | 1,336,469
Gross Unrealized Gains |  | 19,229 |  | 3,110
Gross Unrealized Losses |  | 3,665 |  | 28,634
Securities available-for-sale, at fair value |  | 1,334,517 |  | 1,310,945
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 1,334,517 |  | 1,310,945
State and municipal securities |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 1,658,734 |  | 1,259,267
Gross Unrealized Gains |  | 54,839 |  | 1,126
Gross Unrealized Losses |  | 13,687 |  | 30,739
Securities available-for-sale, at fair value |  | 1,699,886 |  | 1,229,654
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 1,699,886 |  | 1,229,654
Asset-backed securities |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 163,334 |  | 379,107
Gross Unrealized Gains |  | 601 |  | 820
Gross Unrealized Losses |  | 1,202 |  | 4,345
Securities available-for-sale, at fair value |  | 162,733 |  | 375,582
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 162,733 |  | 375,582
Corporate notes and other |  |  |  |
Securities available-for-sale [Abstract] |  |  |  |
Amortized Cost |  | 55,667 |  | 69,399
Gross Unrealized Gains |  | 565 |  | 170
Gross Unrealized Losses |  | 841 |  | 2,523
Securities available-for-sale, at fair value |  | 55,391 |  | 67,046
Available-for-sale, Fair Value [Abstract] |  |  |  |
Securities available-for-sale, at fair value |  | 55,391 |  | 67,046
State and municipal securities |  |  |  |
Securities held-to-maturity [Abstract] |  |  |  |
Amortized Cost |  | 189,684 |  | 194,282
Gross Unrealized Gains |  | 13,137 |  | 152
Gross Unrealized Losses |  | 0 |  | 1,303
Securities held-to-maturity, fair value |  | 202,821 |  | 193,131
Held-to-maturity, Amortized Cost [Abstract] |  |  |  |
Amortized Cost |  | 189,684 |  | 194,282
Held-to-maturity, Fair Value [Abstract] |  |  |  |
Fair Value |  | $ 202,821 |  | $ 193,131

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