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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost [Abstract] |  |
Allowance for Credit Losses | $ (78) | $ (167)
Amortized Cost | 1,370,927 | 1,129,057
Estimated Fair Value [Abstract] |  |
Estimated Fair Value | 1,368,909 | 1,150,885
U. S. agency securities |  |
Amortized Cost [Abstract] |  |
One year or less | 96,891 | 53,916
After one year through five years | 125,593 | 110,083
Five years through ten years | 57,663 | 17,087
Amortized Cost | 280,147 | 181,087
Estimated Fair Value [Abstract] |  |
One year or less | 94,564 | 53,906
After one year through five years | 125,151 | 110,777
Five years through ten years | 55,820 | 17,240
Residential mortgage backed securities |  |
Amortized Cost [Abstract] |  |
Residential mortgage backed securities | 934,615 | 811,328
Amortized Cost | 934,615 | 811,328
Estimated Fair Value [Abstract] |  |
Residential mortgage backed securities | 932,619 | 825,001
Municipal bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 3,343 | 4,329
After one year through five years | 26,564 | 26,622
Five years through ten years | 71,323 | 69,309
After ten years | 2,000 | 2,000
Amortized Cost | 103,230 | 102,259
Estimated Fair Value [Abstract] |  |
One year or less | 3,327 | 4,348
After one year through five years | 28,042 | 28,272
Five years through ten years | 73,698 | 73,389
After ten years | 2,062 | 2,121
Corporate bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 500 | 5,218
After one year through five years | 37,823 | 22,189
After ten years | 14,612 | 6,976
Amortized Cost | 52,935 | 34,383
Estimated Fair Value [Abstract] |  |
One year or less | 500 | 5,220
After one year through five years | 38,392 | 23,267
After ten years | $ 14,812 | $ 7,511

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