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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost [Abstract] |  |
Allowance for Credit Losses | $ (156) | $ 0
Amortized Cost | 956,803 | 839,192
Estimated Fair Value [Abstract] |  |
Estimated Fair Value | 977,570 |
U. S. agency securities |  |
Amortized Cost [Abstract] |  |
One year or less | 38,000 | 96,332
After one year through five years | 81,181 | 76,121
Five years through ten years | 11,132 | 7,775
Amortized Cost | 130,313 | 180,228
Estimated Fair Value [Abstract] |  |
One year or less | 38,111 | 96,226
After one year through five years | 82,057 | 75,821
Five years through ten years | 11,224 | 7,747
Residential mortgage backed securities |  |
Amortized Cost [Abstract] |  |
Residential mortgage backed securities | 702,655 | 541,490
Amortized Cost | 702,655 | 541,490
Estimated Fair Value [Abstract] |  |
Residential mortgage backed securities | 716,643 | 543,852
Municipal bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 4,834 | 5,897
After one year through five years | 26,677 | 21,416
Five years through ten years | 56,781 | 42,589
After ten years | 2,000 | 2,000
Amortized Cost | 90,292 | 71,902
Estimated Fair Value [Abstract] |  |
One year or less | 4,868 | 5,969
After one year through five years | 27,912 | 21,953
Five years through ten years | 59,771 | 44,015
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 2,072 | 1,994
Corporate bonds |  |
Amortized Cost [Abstract] |  |
One year or less | 5,214 | 502
After one year through five years | 21,156 | 8,528
After ten years | 6,975 | 1,500
Amortized Cost | 33,345 | 10,530
Estimated Fair Value [Abstract] |  |
One year or less | 5,257 | 508
After one year through five years | 22,124 | 8,725
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 7,489 | 1,500
U.S. Treasury |  |
Amortized Cost [Abstract] |  |
Residential mortgage backed securities |  | 34,844
Amortized Cost |  | 34,844
Estimated Fair Value [Abstract] |  |
Residential mortgage backed securities |  | 34,855
Other equity investments |  |
Amortized Cost [Abstract] |  |
Residential mortgage backed securities | 198 | 198
Amortized Cost | 198 | 198
Estimated Fair Value [Abstract] |  |
Residential mortgage backed securities | $ 198 | 198
Estimated Fair Value |  | $ 843,363

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