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Securities Securities - Available for sale (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 3,131,227,000 | $ 2,513,540,000
Gross Unrealized Gain | 7,934,000 | 19,244,000
Gross Unrealized Loss | 55,475,000 | 17,501,000
Securities available-for-sale, at fair value | 3,083,686,000 | 2,515,283,000
Available-for-sale, Amortized Cost |  |
Due in one year of less | 47,546,000 |
Due in one year to five years | 45,037,000 |
Due in five to ten years | 100,401,000 |
Due after ten years | 1,222,667,000 |
Mortgage-backed securities | 1,336,469,000 |
Asset-backed securities | 379,107,000 |
Amortized Cost | 3,131,227,000 |
Available-for-sale, Fair Value |  |
Due in one year or less | 47,474,000 |
Due in one year to five years | 44,925,000 |
Due in five years to ten years | 98,424,000 |
Due after ten years | 1,206,336,000 |
Mortgage-backed securities | 1,310,945,000 |
Asset-backed securities | 375,582,000 |
Securities available-for-sale, at fair value | 3,083,686,000 | 2,515,283,000
State and Municipal Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,244,471,000 | 774,949,000
Gross Unrealized Gain | 3,785,000 | 12,251,000
Gross Unrealized Loss | 18,602,000 | 2,588,000
Securities available-for-sale, at fair value | 1,229,654,000 | 784,612,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,229,654,000 | 784,612,000
U.S. Government Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 71,456,000 | 182,500,000
Gross Unrealized Gain | 49,000 | 67,000
Gross Unrealized Loss | 1,346,000 | 1,766,000
Securities available-for-sale, at fair value | 70,159,000 | 180,801,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 70,159,000 | 180,801,000
Mortgage-backed Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,336,469,000 | 1,270,625,000
Gross Unrealized Gain | 3,110,000 | 5,318,000
Gross Unrealized Loss | 28,634,000 | 12,124,000
Securities available-for-sale, at fair value | 1,310,945,000 | 1,263,819,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,310,945,000 | 1,263,819,000
US Treasury Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 30,325,000 | 30,505,000
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 25,000 | 60,000
Securities available-for-sale, at fair value | 30,300,000 | 30,445,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 30,300,000 | 30,445,000
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 379,107,000 | 173,346,000
Gross Unrealized Gain | 820,000 | 262,000
Gross Unrealized Loss | 4,345,000 | 316,000
Securities available-for-sale, at fair value | 375,582,000 | 173,292,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 375,582,000 | 173,292,000
Corporate Notes |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 69,399,000 | 81,615,000
Gross Unrealized Gain | 170,000 | 1,346,000
Gross Unrealized Loss | 2,523,000 | 647,000
Securities available-for-sale, at fair value | 67,046,000 | 82,314,000
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | $ 67,046,000 | $ 82,314,000

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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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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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