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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 1,803,898 | $ 2,642,667
Estimated Fair Value |  |
Before allowance for credit loss, fair value | 1,598,683 | 2,624,028
Allowance for credit losses | (17) | (620)
Estimated Fair Value, after allowance for credit losses | 1,598,666 | 2,623,408
Amortized Cost |  |
HTM, Amortized cost | 1,094,140 | 0
HTM Allowance for credit losses | (766) | 0
HTM, Amortized cost, after allowance | 1,093,374 | 0
Estimated Fair Value |  |
HTM fair value | 968,707 | 0
U.S. agency securities |  |
Amortized Cost |  |
One year or less, amortized cost | 549,137 | 425,597
After one year through five years, amortized cost | 111,742 | 141,537
Five years through ten years, amortized cost | 73,886 | 62,092
After ten years, amortized cost | 13,012 |
Amortized Cost | 747,777 | 629,273
Estimated Fair Value |  |
One year or less, estimated fair value | 490,699 | 421,347
After one year through five years, estimated fair value | 100,297 | 140,785
Five years through ten years, estimated fair value | 68,180 | 60,255
After ten years, estimated fair value | 10,552 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 937,557 | 1,634,468
Amortized Cost | 937,557 | 1,634,421
Estimated Fair Value |  |
Estimated fair value, without maturity date | 820,503 | 1,618,027
Amortized Cost |  |
Amortized cost, without maturity date | 741,057 | 0
HTM, Amortized cost | 741,057 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 652,667 | 0
HTM fair value | 652,667 |
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 56,071 | 58,352
Amortized Cost | 56,071 | 58,352
Estimated Fair Value |  |
Estimated fair value, without maturity date | 50,213 | 59,646
Amortized Cost |  |
Amortized cost, without maturity date | 92,557 |
HTM, Amortized cost | 92,557 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 80,564 |
HTM fair value | 80,564 |
US states and political subdivisions debt securities |  |
Amortized Cost |  |
One year or less, amortized cost | 300 | 4,806
After one year through five years, amortized cost | 1,444 | 25,457
Five years through ten years, amortized cost | 8,956 | 97,945
After ten years, amortized cost | 0 | 13,708
Estimated Fair Value |  |
One year or less, estimated fair value | 300 | 4,861
After one year through five years, estimated fair value | 1,488 | 26,816
Five years through ten years, estimated fair value | 8,299 | 99,960
After ten years, estimated fair value | 0 | 13,797
Amortized Cost |  |
One year or less, amortized cost | 3,139 | 0
After one year through five years, amortized cost | 35,579 | 0
Five years through ten years, amortized cost | 77,262 | 0
After ten years, amortized cost | 12,293 | 0
Estimated Fair Value |  |
One year or less, fair value | 3,110 | 0
After one year through five years, fair value | 33,743 | 0
Five years through ten years, fair value | 67,945 | 0
After ten years, fair value | 11,383 | 0
Corporate bonds |  |
Amortized Cost |  |
One year or less, amortized cost | 0 | 18,924
After one year through five years, amortized cost | 2,000 | 54,630
Five years through ten years, amortized cost | 0 | 55,458
After ten years, amortized cost | 0 | 0
Amortized Cost | 2,000 | 129,012
Estimated Fair Value |  |
One year or less, estimated fair value | 0 | 18,991
After one year through five years, estimated fair value | 1,825 | 54,833
Five years through ten years, estimated fair value | 0 | 55,252
After ten years, estimated fair value | 0 | 0
Amortized Cost |  |
One year or less, amortized cost | 23,954 | 0
After one year through five years, amortized cost | 84,953 | 0
Five years through ten years, amortized cost | 23,346 | 0
HTM, Amortized cost | 132,253 |
Estimated Fair Value |  |
One year or less, fair value | 20,771 | 0
After one year through five years, fair value | 77,997 | 0
Five years through ten years, fair value | 20,527 | 0
HTM fair value | 119,295 |
U.S. treasury |  |
Amortized Cost |  |
Amortized cost, without maturity date | 49,793 | 49,693
Estimated Fair Value |  |
Estimated fair value, without maturity date | $ 46,327 | $ 49,458

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