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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 2,642,667 | $ 1,129,057
Estimated Fair Value |  |
Allowance for credit losses | (620) | (167)
Estimated Fair Value | 2,623,408 | 1,150,885
U.S. agency securities |  |
Amortized Cost |  |
One year or less, amortized cost | 425,597 | 53,916
After one year through five years, amortized cost | 141,537 | 110,083
Five years through ten years, amortized cost | 62,092 | 17,087
Amortized Cost | 629,273 | 181,087
Estimated Fair Value |  |
One year or less, estimated fair value | 421,347 | 53,906
After one year through five years, estimated fair value | 140,785 | 110,777
Five years through ten years, estimated fair value | 60,255 | 17,240
Allowance for credit losses | 0 | 0
Estimated Fair Value | 622,387 | 181,921
Residential mortgage backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 1,692,820 | 811,328
Amortized Cost | 1,692,773 | 811,328
Estimated Fair Value |  |
Estimated fair value, without maturity date | 1,677,673 | 825,001
Allowance for credit losses | 0 |
Estimated Fair Value | 1,677,673 | 825,001
Municipal bonds |  |
Amortized Cost |  |
One year or less, amortized cost | 4,806 | 4,329
After one year through five years, amortized cost | 25,457 | 26,622
Five years through ten years, amortized cost | 97,945 | 69,309
After ten years, amortized cost | 13,708 | 2,000
Amortized Cost | 141,916 | 102,259
Estimated Fair Value |  |
One year or less, estimated fair value | 4,861 | 4,348
After one year through five years, estimated fair value | 26,816 | 28,272
Five years through ten years, estimated fair value | 99,960 | 73,389
After ten years, estimated fair value | 13,797 | 2,121
Allowance for credit losses | (3) | (18)
Estimated Fair Value | 145,431 | 108,113
Corporate bonds |  |
Amortized Cost |  |
One year or less, amortized cost | 18,924 | 5,218
After one year through five years, amortized cost | 54,630 | 22,189
Five years through ten years, amortized cost | 55,458 | 6,976
After ten years, amortized cost | 0 | 0
Amortized Cost | 129,012 | 34,383
Estimated Fair Value |  |
One year or less, estimated fair value | 18,991 | 5,220
After one year through five years, estimated fair value | 54,833 | 23,267
Five years through ten years, estimated fair value | 55,252 | 7,511
After ten years, estimated fair value | 0 | 0
Allowance for credit losses | (617) | (149)
Estimated Fair Value | 128,459 | 35,850
US Treasury and Government |  |
Amortized Cost |  |
Amortized cost, without maturity date | 49,693 | 0
Estimated Fair Value |  |
Estimated fair value, without maturity date | $ 49,458 | $ 0

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