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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 2,440,094 | $ 1,500,687
Unrealized losses less than 12 months | (229,538) | (21,993)
Fair value more than 12 months | 178,921 | 35,281
Unrealized losses more than 12 months | (27,352) | (1,012)
Total fair value | 2,619,015 | 1,535,968
Total unrealized losses | (256,890) | (23,005)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 517,187 | 268,732
Unrealized losses less than 12 months | (28,883) | (2,483)
Fair value more than 12 months | 30,776 | 15,820
Unrealized losses more than 12 months | (2,473) | (430)
Total fair value | 547,963 | 284,552
Total unrealized losses | (31,356) | (2,913)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 1,057,290 | 539,882
Unrealized losses less than 12 months | (132,257) | (9,389)
Fair value more than 12 months | 143,433 | 19,461
Unrealized losses more than 12 months | (24,518) | (582)
Total fair value | 1,200,723 | 559,343
Total unrealized losses | (156,775) | (9,971)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 94,156 | 56,027
Unrealized losses less than 12 months | (4,865) | (1,032)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 94,156 | 56,027
Total unrealized losses | (4,865) | (1,032)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 460,260 | 333,489
Unrealized losses less than 12 months | (37,110) | (3,644)
Fair value more than 12 months | 4,712 | 0
Unrealized losses more than 12 months | (361) | 0
Total fair value | 464,972 | 333,489
Total unrealized losses | (37,471) | (3,644)
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 117,409 | 113,057
Unrealized losses less than 12 months | (9,649) | (2,216)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 117,409 | 113,057
Total unrealized losses | (9,649) | (2,216)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 193,792 | 189,500
Unrealized losses less than 12 months | (16,774) | (3,229)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 193,792 | 189,500
Total unrealized losses | $ (16,774) | $ (3,229)

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