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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 1,156,119 | $ 1,028,550
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 33,052 | 38,272
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 1,122 | 291
Fair Value | 1,188,049 | 1,066,531
Allowance for credit losses - securities held-to-maturity | (161) | (191)
Securities held-to-maturity, net of allowance for credit losses | 1,155,958 | 1,028,359
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 13,330 |
Due in five to ten years | 5,648 |
Due after ten years | 1,030,586 |
Mortgage-backed securities | 106,555 |
Asset-backed securities | 0 |
Amortized cost | 1,156,119 | 1,028,550
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 13,342 |
Due in five to ten years | 5,728 |
Due after ten years | 1,062,534 |
Mortgage-backed securities | 106,445 |
Asset-backed securities | 0 |
Fair Value | 1,188,049 | 1,066,531
U.S. Government Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 11,920 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 37 |
Fair Value | 11,883 |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 11,920 |
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 11,883 |
Mortgage-backed Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 106,555 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 86 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 196 |
Fair Value | 106,445 |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 106,555 |
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 106,445 |
State and Municipal Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 1,037,644 | 1,028,550
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 32,966 | 38,272
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 889 | 291
Fair Value | 1,069,721 | 1,066,531
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 1,037,644 | 1,028,550
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | $ 1,069,721 | $ 1,066,531

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