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Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 17,785 | $ 71,731
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 781,054 | 1,586,756
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 7,851 | 38,920
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 516,267 | 1,161,369
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 9,934 | 32,811
Total Investments with an Unrealized Loss, Fair Value | 1,297,321 | 2,748,125
US Treasury Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 14 | 25
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 40,505 | 30,054
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 14 | 22
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 0 | 246
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 0 | 3
Total Investments with an Unrealized Loss, Fair Value | 40,505 | 30,300
U.S. Government Agency Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 710 | 1,346
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 1,222 | 13,697
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 1 | 328
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 30,892 | 42,539
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 709 | 1,018
Total Investments with an Unrealized Loss, Fair Value | 32,114 | 56,236
Mortgage-backed Agency Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7,776 | 28,634
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 458,881 | 203,299
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 5,102 | 2,134
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 163,767 | 882,231
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 2,674 | 26,500
Total Investments with an Unrealized Loss, Fair Value | 622,648 | 1,085,530
State and Municipal Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7,249 | 34,858
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 204,958 | 1,044,757
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 1,938 | 30,780
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 244,884 | 198,610
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 5,311 | 4,078
Total Investments with an Unrealized Loss, Fair Value | 449,842 | 1,243,367
Asset-backed Securities |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,293 | 4,345
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 75,488 | 268,677
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 796 | 4,118
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 59,816 | 11,828
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 497 | 227
Total Investments with an Unrealized Loss, Fair Value | 135,304 | 280,505
Corporate Notes |  |
Schedule of Investment Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 743 | 2,523
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 0 | 26,272
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 0 | 1,538
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 16,908 | 25,915
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 743 | 985
Total Investments with an Unrealized Loss, Fair Value | $ 16,908 | $ 52,187

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