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Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 26,102 |
Due after one year but within five years | 152,051 |
Due after five years but within ten years | 87,703 |
Due after ten years | 1,000 |
Mortgage-backed securities | 2,632,054 |
Amortized Cost | 2,898,910 | $ 2,662,481
Fair Value |  |
Due within one year | 26,381 |
Due after one year but within five years | 151,996 |
Due after five years but within ten years | 79,832 |
Due after ten years | 928 |
Mortgage-backed securities | 2,425,911 |
Total securities | 2,685,048 | 2,630,414
Amortized Cost |  |
Due within one year | 436 |
Due after one year but within five years | 0 |
Due after five years but within ten years | 17,141 |
Due after ten years | 509,851 |
Mortgage-backed securities | 18,662 |
Amortized Cost | 546,090 | 513,825
Fair Value |  |
Due within one year | 440 |
Due after one year but within five years | 0 |
Due after five years but within ten years | 15,988 |
Due after ten years | 457,366 |
Mortgage-backed securities | 18,513 |
Total securities | $ 492,307 | $ 511,699

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