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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 901,524 | $ 407,150
Investments with an unrealized loss of less than 12 months, unrealized losses | 23,235 | 4,277
Investments with an unrealized loss of 12 months or longer, fair value | 328,449 | 464,283
Investments with an unrealized loss of 12 months or longer, unrealized losses | 6,662 | 13,560
Total investments with an unrealized loss, fair value | 1,229,973 | 871,433
Total investments with an unrealized loss, unrealized losses | 29,897 | 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 | 0 | 0
Investments with an unrealized loss of less than 12 months, unrealized losses | 0 | 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 | 0 | 0
Total investments with an unrealized loss, unrealized losses | 0 | 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 | 109,710 | 9,962
Investments with an unrealized loss of less than 12 months, unrealized losses | 3,355 | 38
Investments with an unrealized loss of 12 months or longer, fair value | 5,701 | 6,091
Investments with an unrealized loss of 12 months or longer, unrealized losses | 26 | 22
Total investments with an unrealized loss, fair value | 115,411 | 16,053
Total investments with an unrealized loss, unrealized losses | 3,381 | 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 | 427,992 | 165,696
Investments with an unrealized loss of less than 12 months, unrealized losses | 14,434 | 1,772
Investments with an unrealized loss of 12 months or longer, fair value | 30,072 | 35,997
Investments with an unrealized loss of 12 months or longer, unrealized losses | 379 | 555
Total investments with an unrealized loss, fair value | 458,064 | 201,693
Total investments with an unrealized loss, unrealized losses | 14,813 | 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 | 287,208 | 175,115
Investments with an unrealized loss of less than 12 months, unrealized losses | 4,779 | 2,220
Investments with an unrealized loss of 12 months or longer, fair value | 253,998 | 345,435
Investments with an unrealized loss of 12 months or longer, unrealized losses | 4,379 | 10,264
Total investments with an unrealized loss, fair value | 541,206 | 520,550
Total investments with an unrealized loss, unrealized losses | 9,158 | 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 | 62,619 | 46,399
Investments with an unrealized loss of less than 12 months, unrealized losses | 662 | 207
Investments with an unrealized loss of 12 months or longer, fair value | 13,228 | 52,840
Investments with an unrealized loss of 12 months or longer, unrealized losses | 30 | 450
Total investments with an unrealized loss, fair value | 75,847 | 99,239
Total investments with an unrealized loss, unrealized losses | 692 | 657
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 13,995 | 9,978
Investments with an unrealized loss of less than 12 months, unrealized losses | 5 | 40
Investments with an unrealized loss of 12 months or longer, fair value | 25,450 | 23,920
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,848 | 2,269
Total investments with an unrealized loss, fair value | 39,445 | 33,898
Total investments with an unrealized loss, unrealized losses | $ 1,853 | $ 2,309

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