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Securities Securities - Unrealized Losses (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 59,594,000 | $ 17,547,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 1,347,820,000 | 1,017,346,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 26,783,000 | 9,021,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 1,161,369,000 | 361,724,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 32,811,000 | 8,526,000
Total Investments with an Unrealized Loss, Fair Value | 2,509,189,000 | 1,379,070,000
US Treasury Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 25,000 | 60,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 30,054,000 | 29,948,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 22,000 | 60,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 246,000 | 0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 3,000 | 0
Total Investments with an Unrealized Loss, Fair Value | 30,300,000 | 29,948,000
U.S. Government Agency Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,346,000 | 1,766,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 13,697,000 | 173,677,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 328,000 | 1,766,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 42,539,000 | 0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 1,018,000 | 0
Total Investments with an Unrealized Loss, Fair Value | 56,236,000 | 173,677,000
Mortgage-backed Agency Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 28,634,000 | 12,124,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 203,299,000 | 607,408,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 2,134,000 | 5,042,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 882,231,000 | 285,561,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 26,500,000 | 7,082,000
Total Investments with an Unrealized Loss, Fair Value | 1,085,530,000 | 892,969,000
State and Municipal Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 22,721,000 | 2,634,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 805,821,000 | 115,403,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 18,643,000 | 1,408,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 198,610,000 | 50,083,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 4,078,000 | 1,226,000
Total Investments with an Unrealized Loss, Fair Value | 1,004,431,000 | 165,486,000
Asset-backed Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4,345,000 | 316,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 268,677,000 | 68,742,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 4,118,000 | 198,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 11,828,000 | 14,136,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 227,000 | 118,000
Total Investments with an Unrealized Loss, Fair Value | 280,505,000 | 82,878,000
Corporate Notes |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2,523,000 | 647,000
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 26,272,000 | 22,168,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 1,538,000 | 547,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 25,915,000 | 11,944,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 985,000 | 100,000
Total Investments with an Unrealized Loss, Fair Value | $ 52,187,000 | $ 34,112,000

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