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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 1,500,687 | $ 79,860
Unrealized losses less than 12 months | (21,993) | (294)
Fair value more than 12 months | 35,281 | 1,245
Unrealized losses more than 12 months | (1,012) | (29)
Total fair value | 1,535,968 | 81,105
Total unrealized losses | (23,005) | (323)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 268,732 | 17,215
Unrealized losses less than 12 months | (2,483) | (35)
Fair value more than 12 months | 15,820 | 0
Unrealized losses more than 12 months | (430) | 0
Total fair value | 284,552 | 17,215
Total unrealized losses | (2,913) | (35)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 539,882 | 56,287
Unrealized losses less than 12 months | (9,389) | (242)
Fair value more than 12 months | 19,461 | 1,245
Unrealized losses more than 12 months | (582) | (29)
Total fair value | 559,343 | 57,532
Total unrealized losses | (9,971) | (271)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 56,027 | 6,358
Unrealized losses less than 12 months | (1,032) | (17)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 56,027 | 6,358
Total unrealized losses | (1,032) | $ (17)
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 333,489 |
Unrealized losses less than 12 months | (3,644) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 333,489 |
Total unrealized losses | (3,644) |
Private labeled mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 113,057 |
Unrealized losses less than 12 months | (2,216) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 113,057 |
Total unrealized losses | (2,216) |
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 189,500 |
Unrealized losses less than 12 months | (3,229) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 189,500 |
Total unrealized losses | $ (3,229) |

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