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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 28,888 | $ 44,206
Amortized cost one to five years | 133,651 | 61,594
Amortized cost for five to ten years | 320,561 | 136,857
Amortized cost for after ten years | 828,788 | 589,200
Available for sale | 1,311,888 | 831,857
Amortized Cost | 1,655,190 | 1,090,363
Within one year, amortized cost | 4,612 | 7,302
One to five years, amortized cost | 45,148 | 42,742
Five to ten years, amortized cost | 185,847 | 82,087
After ten years, amortized cost | 181,925 | 25,290
Total amortized cost | 417,532 | 157,421
Investment securities, held to maturity | 769,240 | 168,676
Fair value within one year | 28,885 | 44,192
Fair value for one to five years | 134,899 | 63,006
Fair value for five to ten years | 322,940 | 145,102
Fair value for after ten years | 836,743 | 615,473
Total fair value | 1,323,467 | 867,773
Investment securities, available for sale | 1,669,634 | 1,134,025
Within one year, fair value | 4,666 | 7,327
One to five years, fair value | 46,573 | 44,358
Five to ten years, fair value | 188,962 | 88,300
After ten years, fair value | 181,094 | 28,471
Total fair value | 421,295 | 168,456
Fair Value | 768,099 | 179,990
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 73,922 | 144,022
Amortized Cost | 73,922 | 144,022
Investment securities, held to maturity | 69,537 | 2,661
Investment securities, available for sale | 75,525 | 147,453
Fair Value | 68,754 | 2,697
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 236,432 | 114,484
Amortized Cost | 236,432 | 114,484
Investment securities, held to maturity | 215,873 | 8,594
Investment securities, available for sale | 237,705 | 118,799
Fair Value | 212,498 | 8,837
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 32,948 | 0
Amortized Cost | 32,948 |
Investment securities, held to maturity | 66,298 | 0
Investment securities, available for sale | 32,937 | 0
Fair Value | $ 65,552 | $ 0

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