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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | $ 2,410,434 | $ 1,500,686
Unrealized losses less than 12 months | (363,840) | (21,993)
Fair value more than 12 months | 268,035 | 35,281
Unrealized losses more than 12 months | (57,592) | (1,012)
Total fair value | 2,678,469 | 1,535,967
Total unrealized losses | (421,432) | (23,005)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 478,535 | 268,732
Unrealized losses less than 12 months | (45,494) | (2,483)
Fair value more than 12 months | 57,639 | 15,820
Unrealized losses more than 12 months | (8,261) | (430)
Total fair value | 536,174 | 284,552
Total unrealized losses | (53,755) | (2,913)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 1,122,880 | 539,882
Unrealized losses less than 12 months | (212,110) | (9,389)
Fair value more than 12 months | 153,945 | 19,461
Unrealized losses more than 12 months | (41,323) | (582)
Total fair value | 1,276,825 | 559,343
Total unrealized losses | (253,433) | (9,971)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 93,150 | 56,027
Unrealized losses less than 12 months | (7,203) | (1,032)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 93,150 | 56,027
Total unrealized losses | (7,203) | (1,032)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 483,127 | 406,540
Unrealized losses less than 12 months | (66,195) | (5,418)
Fair value more than 12 months | 39,318 | 0
Unrealized losses more than 12 months | (5,284) | 0
Total fair value | 522,445 | 406,540
Total unrealized losses | (71,479) | (5,418)
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 32,755 | 40,005
Unrealized losses less than 12 months | (4,346) | (442)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 32,755 | 40,005
Total unrealized losses | (4,346) | (442)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 199,987 | 189,500
Unrealized losses less than 12 months | (28,492) | (3,229)
Fair value more than 12 months | 17,133 | 0
Unrealized losses more than 12 months | (2,724) | 0
Total fair value | 217,120 | 189,500
Total unrealized losses | $ (31,216) | $ (3,229)

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