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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | $ 1,028,550,000 |  | $ 188,996,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 38,272,000 |  | 12,221,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 291,000 |  | 0
Fair Value | 1,066,531,000 |  | 201,217,000
Allowance for credit losses - securities held-to-maturity | (191,000) | $ (10,000) |
Securities held-to-maturity, net of allowance for credit losses | 1,028,359,000 |  | 188,996,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in one year or less | 0 |  |
Due in one year to five years | 1,409,000 |  |
Due in five to ten years | 7,180,000 |  |
Due after ten years | 1,019,961,000 |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost | 0 |  |
Held To Maturity Securities Debt Maturities Asset Backed Securities Amortized Cost | 0 |  |
Amortized Cost | 1,028,550,000 |  | 188,996,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in one year or less | 0 |  |
Due in one year to five years | 1,494,000 |  |
Due in five to ten years | 7,300,000 |  |
Due after ten years | 1,057,737,000 |  |
Mortgage-backed securities | 0 |  |
Asset-backed securities | 0 |  |
Fair Value | 1,066,531,000 |  | 201,217,000
State And Municipal Securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 1,028,550,000 |  | 188,996,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 38,272,000 |  | 12,221,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 291,000 |  | 0
Fair Value | 1,066,531,000 |  | 201,217,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Amortized Cost | 1,028,550,000 |  | 188,996,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Fair Value | $ 1,066,531,000 |  | $ 201,217,000

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