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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 3,008,104,000 | $ 2,513,540,000
Gross Unrealized Gains | 8,866,000 | 19,244,000
Gross Unrealized Losses | 56,842,000 | 17,501,000
Securities available-for-sale, at fair value | 2,960,128,000 | 2,515,283,000
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 102,756,000 |
Due in five years to ten years | 176,890,000 |
Due after ten years | 1,218,580,000 |
Mortgage-backed securities | 1,269,307,000 |
Asset-backed securities | 240,571,000 |
Amortized Cost | 3,008,104,000 |
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 102,863,000 |
Due in five years to ten years | 175,583,000 |
Due after ten years | 1,202,205,000 |
Mortgage-backed securities | 1,239,031,000 |
Asset-backed securities | 240,446,000 |
Securities available-for-sale, at fair value | 2,960,128,000 | 2,515,283,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 0 |
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 15,341,000 | 20,762,000
Gross Unrealized Gains | 31,000 | 114,000
Gross Unrealized Losses | 113,000 | 46,000
Securities held-to-maturity, fair value | 15,259,000 | 20,830,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year to five years | 6,412,000 |
Due in five years to ten years | 8,015,000 |
Due after ten years | 914,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Amortized Cost | 15,341,000 | 20,762,000
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 6,405,000 |
Due in five years to ten years | 7,941,000 |
Due after ten years | 913,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Fair Value | 15,259,000 | 20,830,000
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 30,806,000 | 30,505,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 26,000 | 60,000
Securities available-for-sale, at fair value | 30,780,000 | 30,445,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 30,780,000 | 30,445,000
U.S. government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 177,178,000 | 182,500,000
Gross Unrealized Gains | 37,000 | 67,000
Gross Unrealized Losses | 3,986,000 | 1,766,000
Securities available-for-sale, at fair value | 173,229,000 | 180,801,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 173,229,000 | 180,801,000
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,269,307,000 | 1,270,625,000
Gross Unrealized Gains | 3,866,000 | 5,318,000
Gross Unrealized Losses | 34,142,000 | 12,124,000
Securities available-for-sale, at fair value | 1,239,031,000 | 1,263,819,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,239,031,000 | 1,263,819,000
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,220,415,000 | 774,949,000
Gross Unrealized Gains | 3,775,000 | 12,251,000
Gross Unrealized Losses | 17,009,000 | 2,588,000
Securities available-for-sale, at fair value | 1,207,181,000 | 784,612,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,207,181,000 | 784,612,000
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 240,571,000 | 173,346,000
Gross Unrealized Gains | 464,000 | 262,000
Gross Unrealized Losses | 589,000 | 316,000
Securities available-for-sale, at fair value | 240,446,000 | 173,292,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 240,446,000 | 173,292,000
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 69,827,000 | 81,615,000
Gross Unrealized Gains | 724,000 | 1,346,000
Gross Unrealized Losses | 1,090,000 | 647,000
Securities available-for-sale, at fair value | 69,461,000 | 82,314,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 69,461,000 | 82,314,000
State and municipal securities |  |
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 15,341,000 | 20,762,000
Gross Unrealized Gains | 31,000 | 114,000
Gross Unrealized Losses | 113,000 | 46,000
Securities held-to-maturity, fair value | 15,259,000 | 20,830,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 15,341,000 | 20,762,000
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 15,259,000 | $ 20,830,000

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- Definition Represents amount of available-for-sale debt securities at cost, net of adjustment of asset-backed securities. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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