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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,674,264 | $ 1,129,057
Estimated Fair Value [Abstract] |  |
Allowance for Credit Losses | (132) | (167)
Estimated Fair Value | 1,680,832 | 1,150,885
U. S. agency securities |  |
Amortized Cost [Abstract] |  |
One year or less | 159,698 | 53,916
After one year through five years | 122,900 | 110,083
Five years through ten years | 76,741 | 17,087
Amortized Cost | 359,339 | 181,087
Estimated Fair Value [Abstract] |  |
One year or less | 158,781 | 53,906
After one year through five years | 122,872 | 110,777
Five years through ten years | 75,658 | 17,240
Residential mortgage backed securities |  |
Amortized Cost [Abstract] |  |
Residential mortgage backed securities | 1,143,931 | 811,328
Amortized Cost | 1,143,931 | 811,328
Estimated Fair Value [Abstract] |  |
Residential mortgage backed securities | 1,146,322 | 825,001
Municipal bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 2,764 | 4,329
After one year through five years | 26,121 | 26,622
Five years through ten years | 66,559 | 69,309
After ten years | 0 | 2,000
Amortized Cost | 95,444 | 102,259
Estimated Fair Value [Abstract] |  |
One year or less | 2,796 | 4,348
After one year through five years | 27,751 | 28,272
Five years through ten years | 69,732 | 73,389
After ten years | 0 | 2,121
Corporate bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 6,314 | 5,218
After one year through five years | 48,958 | 22,189
Five years through ten years | 20,278 | 0
After ten years | 0 | 6,976
Amortized Cost | 75,550 | 34,383
Estimated Fair Value [Abstract] |  |
One year or less | 6,542 | 5,220
After one year through five years | 49,744 | 23,267
Five years through ten years | 20,766 | 0
After ten years | $ 0 | $ 7,511

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