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Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | $ 407,150 | $ 781,054
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 4,277 | 7,851
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 464,283 | 516,267
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 13,560 | 9,934
Total Investments with an Unrealized Loss, Fair Value | 871,433 | 1,297,321
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 17,837 | 17,785
US Treasury Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 0 | 40,505
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 0 | 14
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 0 | 0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 0 | 0
Total Investments with an Unrealized Loss, Fair Value | 0 | 40,505
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 14
U.S. Government Agency Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 9,962 | 1,222
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 38 | 1
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 6,091 | 30,892
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 22 | 709
Total Investments with an Unrealized Loss, Fair Value | 16,053 | 32,114
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 60 | 710
Mortgage-backed Agency Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 165,696 | 458,881
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 1,772 | 5,102
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 35,997 | 163,767
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 555 | 2,674
Total Investments with an Unrealized Loss, Fair Value | 201,693 | 622,648
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2,327 | 7,776
State and Municipal Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 175,115 | 204,958
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 2,220 | 1,938
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 345,435 | 244,884
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 10,264 | 5,311
Total Investments with an Unrealized Loss, Fair Value | 520,550 | 449,842
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 12,484 | 7,249
Asset-backed Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 46,399 | 75,488
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 207 | 796
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 52,840 | 59,816
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 450 | 497
Total Investments with an Unrealized Loss, Fair Value | 99,239 | 135,304
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 657 | 1,293
Corporate Notes |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Investments with an Unrealized Loss of less than 12 months, Fair Value | 9,978 | 0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses | 40 | 0
Investments with an Unrealized Loss of 12 months or longer, Fair Value | 23,920 | 16,908
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses | 2,269 | 743
Total Investments with an Unrealized Loss, Fair Value | 33,898 | 16,908
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2,309 | $ 743

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