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Investment Securities - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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AFS Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,873,491 | $ 2,642,667
AFS Estimated Fair Value [Abstract] |  |
Allowance for credit losses | (18) | (620)
Estimated Fair Value | 1,775,633 | 2,623,408
Allowance for credit losses | 817 | 0
HTM Amortized Cost [Abstract] |  |
Amortized Cost | 1,153,399 | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Allowance for credit losses | (817) | 0
Estimated Fair Value | 1,144,505 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
Amortized Cost | 3,026,890 | 2,642,667
Estimated Fair Value | 2,920,138 | 2,623,408
Allowance for credit losses | (18) | (620)
Investment securities available for sale, amortized cost | 1,873,491 | 2,642,667
Estimated Fair Value | 1,775,633 | 2,623,408
U.S. treasury bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 49,718 | 49,693
Amortized Cost | 49,718 | 49,693
AFS Estimated Fair Value [Abstract] |  |
One year or less | 47,492 | 49,458
Allowance for credit losses | 0 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
One year or less | 49,718 | 49,693
One year or less | 47,492 | 49,458
Allowance for credit losses | 0 | 0
Investment securities available for sale, amortized cost | 49,718 | 49,693
U. S. agency securities |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 521,053 | 425,597
After one year through five years | 168,414 | 131,918
After five years through ten years | 54,937 | 71,758
Amortized Cost | 744,404 | 629,273
AFS Estimated Fair Value [Abstract] |  |
One year or less | 494,594 | 421,347
After one year through five years | 160,927 | 140,785
After five years through ten years | 51,033 | 60,255
Allowance for credit losses | 0 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
One year or less | 521,053 | 425,597
One year or less | 494,594 | 421,347
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 168,414 | 131,918
After one year through five years | 160,927 | 140,785
After five years through ten years | 54,937 | 71,758
After five years through ten years | 51,033 | 60,255
Allowance for credit losses | 0 | 0
Investment securities available for sale, amortized cost | 744,404 | 629,273
Residential mortgage-backed securities |  |
AFS Amortized Cost [Abstract] |  |
Residential mortgage-backed securities | 1,062,085 | 1,692,773
Amortized Cost | 1,062,085 | 1,692,773
AFS Estimated Fair Value [Abstract] |  |
Residential mortgage-backed securities | 1,004,425 | 1,677,673
Allowance for credit losses | 0 | 0
Allowance for credit losses | 0 |
HTM Amortized Cost [Abstract] |  |
Residential mortgage-backed securities | 886,526 | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
After ten years | 877,616 | 0
Allowance for credit losses | 0 |
Estimated Fair Value | 877,616 |
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
Residential mortgage-backed securities | 1,062,085 | 1,692,773
Residential mortgage-backed securities | 1,004,425 | 1,677,673
Allowance for credit losses | 0 | 0
Investment securities available for sale, amortized cost | 1,062,085 | 1,692,773
Municipal bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 4,797 | 4,806
After one year through five years | 1,403 | 25,457
After five years through ten years | 9,084 | 97,945
After ten years | 0 | 13,708
Amortized Cost | 15,284 | 141,916
AFS Estimated Fair Value [Abstract] |  |
One year or less | 4,815 | 4,861
After one year through five years | 1,486 | 26,816
After five years through ten years | 8,879 | 99,960
After ten years | 0 | 13,797
Allowance for credit losses | (1) | (3)
Allowance for credit losses | 16 |
HTM Amortized Cost [Abstract] |  |
After one year through five years | 35,460 | 0
After five years through ten years | 76,633 | 0
After ten years | 16,833 | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
After one year through five years | 35,460 | 0
After five years through ten years | 76,410 | 0
After ten years | 16,502 | 0
Allowance for credit losses | (16) |
Estimated Fair Value | 128,374 |
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
One year or less | 4,797 | 4,806
One year or less | 4,815 | 4,861
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 1,403 | 25,457
After one year through five years | 1,486 | 26,816
After five years through ten years | 9,084 | 97,945
After five years through ten years | 8,879 | 99,960
After ten years | 0 | 13,708
After ten years | 0 | 13,797
Allowance for credit losses | (1) | (3)
Investment securities available for sale, amortized cost | 15,284 | 141,916
Corporate bonds |  |
AFS Amortized Cost [Abstract] |  |
One year or less | 0 | 18,924
After one year through five years | 0 | 54,630
After five years through ten years | 2,000 | 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 | 0 | 54,833
After five years through ten years | 2,000 | 55,252
Allowance for credit losses | (17) | (617)
Allowance for credit losses | 801 |
HTM Amortized Cost [Abstract] |  |
One year or less | 18,492 | 0
After one year through five years | 82,943 | 0
After five years through ten years | 37,329 | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
One year or less | 18,492 | 0
After one year through five years | 82,696 | 0
After five years through ten years | 37,329 | 0
Allowance for credit losses | (801) |
Estimated Fair Value | 138,515 |
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract] |  |
One year or less | 0 | 18,924
One year or less | 0 | 18,991
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 0 | 54,630
After one year through five years | 0 | 54,833
After five years through ten years | 2,000 | 55,458
After five years through ten years | 2,000 | 55,252
Allowance for credit losses | (17) | (617)
Investment securities available for sale, amortized cost | $ 2,000 | $ 129,012

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