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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 880,068 | $ 1,500,686
Unrealized losses less than 12 months | (75,452) | (21,993)
Fair value more than 12 months | 1,719,396 | 35,281
Unrealized losses more than 12 months | (406,840) | (1,012)
Total fair value | 2,599,464 | 1,535,967
Total unrealized losses | (482,292) | (23,005)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 217,357 | 268,732
Unrealized losses less than 12 months | (16,692) | (2,483)
Fair value more than 12 months | 295,585 | 15,820
Unrealized losses more than 12 months | (59,695) | (430)
Total fair value | 512,942 | 284,552
Total unrealized losses | (76,387) | (2,913)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 533,871 | 539,882
Unrealized losses less than 12 months | (45,881) | (9,389)
Fair value more than 12 months | 757,061 | 19,461
Unrealized losses more than 12 months | (218,179) | (582)
Total fair value | 1,290,932 | 559,343
Total unrealized losses | (264,060) | (9,971)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 40,301 | 56,027
Unrealized losses less than 12 months | (2,881) | (1,032)
Fair value more than 12 months | 38,613 | 0
Unrealized losses more than 12 months | (7,780) | 0
Total fair value | 78,914 | 56,027
Total unrealized losses | (10,661) | (1,032)
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 49,633 | 406,540
Unrealized losses less than 12 months | (3,211) | (5,418)
Fair value more than 12 months | 428,243 | 0
Unrealized losses more than 12 months | (83,810) | 0
Total fair value | 477,876 | 406,540
Total unrealized losses | (87,021) | (5,418)
Private labeled mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 0 | 40,005
Unrealized losses less than 12 months | 0 | (442)
Fair value more than 12 months | 29,973 | 0
Unrealized losses more than 12 months | (5,493) | 0
Total fair value | 29,973 | 40,005
Total unrealized losses | (5,493) | (442)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 38,906 | 189,500
Unrealized losses less than 12 months | (6,787) | (3,229)
Fair value more than 12 months | 169,921 | 0
Unrealized losses more than 12 months | (31,883) | 0
Total fair value | 208,827 | 189,500
Total unrealized losses | $ (38,670) | $ (3,229)

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