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Schedule of Temporary Impairment Losses, Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 894,437 | $ 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (14,081) | (10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 894,437 | 3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (14,081) | (10)
Debt Securities, Held-to-maturity | 548,057 | 361,844
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 5,243 | 8,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,957) | (10)
Securities held to maturity, fair value | 547,343 | 369,851
US Government Agencies Debt Securities Commercial |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 213,203 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,281) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 213,203 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,281) |
Residential Mortgage Backed Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 640,235 | 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (10,850) | (10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 640,235 | 3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (10,850) | (10)
Debt Securities, Held-to-maturity | 387,399 | 277,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3,832 | 5,389
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4,303) | (10)
Securities held to maturity, fair value | 386,928 | 282,730
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 22,090 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (735) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 22,090 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (735) |
Debt Securities, Held-to-maturity | 21,825 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (726) | 0
Securities held to maturity, fair value | 21,099 | 0
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 13,798 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (175) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 13,798 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (175) |
Debt Securities, Held-to-maturity | 31,246 | 34,391
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 461 | 705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (94) | 0
Securities held to maturity, fair value | 31,613 | 35,096
Corporate Debt Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5,111 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (40) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 5,111 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (40) |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Debt Securities, Held-to-maturity | 7,927 | 9,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 235 | 344
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Securities held to maturity, fair value | $ 8,162 | $ 10,081

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