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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | $ 741,644 | $ 407,150
Investments with an unrealized loss of less than 12 months, unrealized losses | 8,572 | 4,277
Investments with an unrealized loss of 12 months or longer, fair value | 259,100 | 464,283
Investments with an unrealized loss of 12 months or longer, unrealized losses | 5,429 | 13,560
Total investments with an unrealized loss, fair value | 1,000,744 | 871,433
Total investments with an unrealized loss, unrealized losses | 14,001 | 17,837
U.S. Treasury securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 59,973 | 0
Investments with an unrealized loss of less than 12 months, unrealized losses | 11 | 0
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 | 59,973 | 0
Total investments with an unrealized loss, unrealized losses | 11 | 0
U.S. government agency securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 111,928 | 9,962
Investments with an unrealized loss of less than 12 months, unrealized losses | 2,172 | 38
Investments with an unrealized loss of 12 months or longer, fair value | 5,497 | 6,091
Investments with an unrealized loss of 12 months or longer, unrealized losses | 19 | 22
Total investments with an unrealized loss, fair value | 117,425 | 16,053
Total investments with an unrealized loss, unrealized losses | 2,191 | 60
Mortgage-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 361,860 | 165,696
Investments with an unrealized loss of less than 12 months, unrealized losses | 5,059 | 1,772
Investments with an unrealized loss of 12 months or longer, fair value | 54,747 | 35,997
Investments with an unrealized loss of 12 months or longer, unrealized losses | 959 | 555
Total investments with an unrealized loss, fair value | 416,607 | 201,693
Total investments with an unrealized loss, unrealized losses | 6,018 | 2,327
State and municipal securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 117,715 | 175,115
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,035 | 2,220
Investments with an unrealized loss of 12 months or longer, fair value | 167,184 | 345,435
Investments with an unrealized loss of 12 months or longer, unrealized losses | 2,712 | 10,264
Total investments with an unrealized loss, fair value | 284,899 | 520,550
Total investments with an unrealized loss, unrealized losses | 3,747 | 12,484
Asset-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 85,178 | 46,399
Investments with an unrealized loss of less than 12 months, unrealized losses | 285 | 207
Investments with an unrealized loss of 12 months or longer, fair value | 6,859 | 52,840
Investments with an unrealized loss of 12 months or longer, unrealized losses | 145 | 450
Total investments with an unrealized loss, fair value | 92,037 | 99,239
Total investments with an unrealized loss, unrealized losses | 430 | 657
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 4,990 | 9,978
Investments with an unrealized loss of less than 12 months, unrealized losses | 10 | 40
Investments with an unrealized loss of 12 months or longer, fair value | 24,813 | 23,920
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,594 | 2,269
Total investments with an unrealized loss, fair value | 29,803 | 33,898
Total investments with an unrealized loss, unrealized losses | $ 1,604 | $ 2,309

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