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Investment Securities - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
AFS Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,873,872 | $ 2,642,667
AFS Estimated Fair Value [Abstract] |  |
Allowance for credit losses | (18) | (620)
Estimated Fair Value | 1,649,753 | 2,623,408
HTM Amortized Cost [Abstract] |  |
Allowance for credit losses | (802) | 0
Amortized Cost | 1,114,084 | 0
HTM Estimated Fair Value [Abstract] |  |
Investment securities, held-to-maturity, estimated fair value | 989,001 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
Amortized Cost | 2,987,956 | 2,642,667
Estimated Fair Value | 2,638,754 | 2,623,408
U.S. treasury bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 49,767 | 49,693
Amortized Cost | 49,767 | 49,693
AFS Estimated Fair Value [Abstract] |  |
One year or less | 46,048 | 49,458
Allowance for credit losses | 0 | 0
U. S. agency securities |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 535,826 | 425,597
After one year through five years | 160,848 | 141,537
After five years through ten years | 54,323 | 62,092
Amortized Cost | 750,997 | 629,273
AFS Estimated Fair Value [Abstract] |  |
One year or less | 474,498 | 421,347
After one year through five years | 147,596 | 140,785
After five years through ten years | 46,234 | 60,255
Allowance for credit losses | 0 | 0
Residential mortgage-backed securities |  |
AFS Amortized Cost [Abstract] |  |
Residential mortgage-backed securities: | 958,800 | 1,692,820
Amortized Cost | 958,800 | 1,692,773
AFS Estimated Fair Value [Abstract] |  |
Residential mortgage-backed securities: | 828,367 | 1,677,673
Allowance for credit losses | 0 | 0
HTM Amortized Cost [Abstract] |  |
One year or less | 761,304 | 0
Allowance for credit losses | 0 |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 674,281 | 0
Investment securities, held-to-maturity, estimated fair value | 674,281 |
Commercial mortgage-backed securities |  |
AFS Amortized Cost [Abstract] |  |
Residential mortgage-backed securities: | 100,278 | 0
Amortized Cost | 100,278 |
AFS Estimated Fair Value [Abstract] |  |
Residential mortgage-backed securities: | 94,172 | 0
Allowance for credit losses | 0 |
HTM Amortized Cost [Abstract] |  |
One year or less | 92,948 | 0
Allowance for credit losses | 0 |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 81,733 | 0
Investment securities, held-to-maturity, estimated fair value | 81,733 |
Municipal bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 1,600 | 4,806
After one year through five years | 1,430 | 25,457
After five years through ten years | 9,000 | 97,945
After ten years | 0 | 13,708
Amortized Cost | 12,030 | 141,916
AFS Estimated Fair Value [Abstract] |  |
One year or less | 1,600 | 4,861
After one year through five years | 1,441 | 26,816
After five years through ten years | 7,953 | 99,960
After ten years | 0 | 13,797
Allowance for credit losses | (1) | (3)
HTM Amortized Cost [Abstract] |  |
One year or less | 3,161 | 0
After one year through five years | 35,637 | 0
After five years through ten years | 77,278 | 0
After ten years | 12,310 | 0
Allowance for credit losses | (16) |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 3,100 | 0
After one year through five years | 32,630 | 0
After five years through ten years | 66,457 | 0
After ten years | 10,687 | 0
Investment securities, held-to-maturity, estimated fair value | 112,874 |
Corporate bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 0 | 18,924
After one year through five years | 2,000 | 54,630
After five years through ten years | 0 | 55,458
Amortized Cost | 2,000 | 129,012
AFS Estimated Fair Value [Abstract] |  |
One year or less | 0 | 18,991
After one year through five years | 1,862 | 54,833
After five years through ten years | 0 | 55,252
Allowance for credit losses | (17) | (617)
HTM Amortized Cost [Abstract] |  |
One year or less | 19,553 | 0
After one year through five years | 89,358 | 0
After five years through ten years | 23,337 | 0
Allowance for credit losses | (786) |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 17,364 | 0
After one year through five years | 82,204 | 0
After five years through ten years | 20,545 | $ 0
Investment securities, held-to-maturity, estimated fair value | $ 120,113 |

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