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Investment Securities - Schedule of Gross Unrealized Losses on Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | $ 1,257,882 | $ 928,115
Unrealized Loss, Less than 12 months | (87,240) | (14,703)
Fair Value, 12 months or more | 177,018 | 102,799
Unrealized Loss, 12 months or more | (17,925) | (3,690)
Fair Value, Total | 1,434,900 | 1,030,914
Unrealized Loss, Total | (105,165) | (18,393)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 38,882 | 18,360
Unrealized Loss, Less than 12 months | (2,133) | (171)
Fair Value, 12 months or more | 0 | 0
Unrealized Loss, 12 months or more | 0 | 0
Fair Value, Total | 38,882 | 18,360
Unrealized Loss, Total | (2,133) | (171)
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 961,993 | 871,368
Unrealized Loss, Less than 12 months | (70,839) | (14,295)
Fair Value, 12 months or more | 175,988 | 102,799
Unrealized Loss, 12 months or more | (17,726) | (3,690)
Fair Value, Total | 1,137,981 | 974,167
Unrealized Loss, Total | (88,565) | (17,985)
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 9,647 | 7,946
Unrealized Loss, Less than 12 months | (445) | (46)
Fair Value, 12 months or more | 0 | 0
Unrealized Loss, 12 months or more | 0 | 0
Fair Value, Total | 9,647 | 7,946
Unrealized Loss, Total | (445) | (46)
Municipal securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 192,546 | 11,414
Unrealized Loss, Less than 12 months | (11,844) | (160)
Fair Value, 12 months or more | 1,030 | 0
Unrealized Loss, 12 months or more | (199) | 0
Fair Value, Total | 193,576 | 11,414
Unrealized Loss, Total | (12,043) | (160)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 47,918 | 14,908
Unrealized Loss, Less than 12 months | (1,744) | (6)
Fair Value, 12 months or more | 0 | 0
Unrealized Loss, 12 months or more | 0 | 0
Fair Value, Total | 47,918 | 14,908
Unrealized Loss, Total | (1,744) | (6)
Corporate securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 6,896 | 4,119
Unrealized Loss, Less than 12 months | (235) | (25)
Fair Value, 12 months or more | 0 | 0
Unrealized Loss, 12 months or more | 0 | 0
Fair Value, Total | 6,896 | 4,119
Unrealized Loss, Total | $ (235) | $ (25)

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