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Investment Securities - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
AFS Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,897,985 | $ 2,642,667
AFS Estimated Fair Value [Abstract] |  |
Allowance for credit losses | (18) | (620)
Estimated Fair Value | 1,755,254 | 2,623,408
HTM Amortized Cost [Abstract] |  |
Allowance for credit losses | (826) | 0
Amortized Cost | 1,143,632 | 0
HTM Estimated Fair Value [Abstract] |  |
Investment securities, held-to-maturity, estimated fair value | 1,084,706 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
Amortized Cost | 3,041,617 | 2,642,667
Estimated Fair Value | 2,839,960 | 2,623,408
U.S. treasury bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 49,742 | 49,693
Amortized Cost | 49,742 | 49,693
AFS Estimated Fair Value [Abstract] |  |
One year or less | 47,081 | 49,458
Allowance for credit losses | 0 | 0
U. S. agency securities |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 530,539 | 425,597
After one year through five years | 165,716 | 141,584
After five years through ten years | 54,648 | 62,092
Amortized Cost | 750,903 | 629,273
AFS Estimated Fair Value [Abstract] |  |
One year or less | 492,427 | 421,347
After one year through five years | 156,493 | 140,785
After five years through ten years | 49,137 | 60,255
Allowance for credit losses | 0 | 0
Residential mortgage-backed securities |  |
AFS Amortized Cost [Abstract] |  |
Residential mortgage-backed securities | 968,589 | 1,692,773
Amortized Cost | 968,589 | 1,692,773
AFS Estimated Fair Value [Abstract] |  |
Residential mortgage-backed securities | 885,689 | 1,677,673
Allowance for credit losses | 0 | 0
HTM Amortized Cost [Abstract] |  |
One year or less | 785,857 | 0
Allowance for credit losses | 0 |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 745,453 | 0
Investment securities, held-to-maturity, estimated fair value | 745,453 |
Commercial mortgage-backed securities |  |
AFS Amortized Cost [Abstract] |  |
Residential mortgage-backed securities | 113,243 | 0
Amortized Cost | 113,243 |
AFS Estimated Fair Value [Abstract] |  |
Residential mortgage-backed securities | 109,549 | 0
Allowance for credit losses | 0 |
HTM Amortized Cost [Abstract] |  |
One year or less | 94,841 | 0
Allowance for credit losses | 0 |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 88,272 | 0
Investment securities, held-to-maturity, estimated fair value | 88,272 |
Municipal bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 3,050 | 4,806
After one year through five years | 1,416 | 25,457
After five years through ten years | 9,042 | 97,945
After ten years | 0 | 13,708
Amortized Cost | 13,508 | 141,916
AFS Estimated Fair Value [Abstract] |  |
One year or less | 3,053 | 4,861
After one year through five years | 1,476 | 26,816
After five years through ten years | 8,404 | 99,960
After ten years | 0 | 13,797
Allowance for credit losses | (1) | (3)
HTM Amortized Cost [Abstract] |  |
One year or less | 666 | 0
After one year through five years | 38,194 | 0
After five years through ten years | 72,954 | 0
After ten years | 16,695 | 0
Allowance for credit losses | (16) |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 663 | 0
After one year through five years | 36,531 | 0
After five years through ten years | 67,639 | 0
After ten years | 15,443 | 0
Investment securities, held-to-maturity, estimated fair value | 120,276 |
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 | 1,963 | 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 | 25,042 | 0
After one year through five years | 74,903 | 0
After five years through ten years | 35,306 | 0
Allowance for credit losses | (810) |
HTM Estimated Fair Value [Abstract] |  |
One year or less | 24,936 | 0
After one year through five years | 72,526 | 0
After five years through ten years | 33,243 | $ 0
Investment securities, held-to-maturity, estimated fair value | $ 130,705 |

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