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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 1,430,764 | $ 79,860
Unrealized losses less than 12 months | (22,640) | (294)
Fair value more than 12 months | 8,047 | 1,245
Unrealized losses more than 12 months | (246) | (29)
Total fair value | 1,438,811 | 81,105
Total unrealized losses | (22,886) | (323)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 108,551 | 17,215
Unrealized losses less than 12 months | (688) | (35)
Fair value more than 12 months | 2,731 | 0
Unrealized losses more than 12 months | (19) | 0
Total fair value | 111,282 | 17,215
Total unrealized losses | (707) | (35)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 680,184 | 56,287
Unrealized losses less than 12 months | (13,892) | (242)
Fair value more than 12 months | 5,316 | 1,245
Unrealized losses more than 12 months | (227) | (29)
Total fair value | 685,500 | 57,532
Total unrealized losses | (14,119) | (271)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 57,191 | 6,358
Unrealized losses less than 12 months | (797) | (17)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 57,191 | 6,358
Total unrealized losses | (797) | $ (17)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 363,453 |
Unrealized losses less than 12 months | (4,610) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 363,453 |
Total unrealized losses | (4,610) |
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 77,208 |
Unrealized losses less than 12 months | (1,038) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 77,208 |
Total unrealized losses | (1,038) |
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 144,177 |
Unrealized losses less than 12 months | (1,615) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 144,177 |
Total unrealized losses | $ (1,615) |

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