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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 46,747 | $ 44,206
Amortized cost one to five years | 156,088 | 61,594
Amortized cost for five to ten years | 362,439 | 136,857
Amortized cost for after ten years | 802,546 | 589,200
Available for sale | 1,367,820 | 831,857
Amortized Cost | 1,662,254 | 1,090,363
Within one year, amortized cost | 4,314 | 7,302
One to five years, amortized cost | 43,418 | 42,742
Five to ten years, amortized cost | 73,870 | 82,087
After ten years, amortized cost | 22,828 | 25,290
Total amortized cost | 144,430 | 157,421
Investment securities, held to maturity | 153,284 | 168,676
Fair value within one year | 46,784 | 44,192
Fair value for one to five years | 157,620 | 63,006
Fair value for five to ten years | 366,313 | 145,102
Fair value for after ten years | 820,769 | 615,473
Total fair value | 1,391,486 | 867,773
Investment securities, available for sale | 1,691,186 | 1,134,025
Within one year, fair value | 4,349 | 7,327
One to five years, fair value | 44,942 | 44,358
Five to ten years, fair value | 78,956 | 88,300
After ten years, fair value | 25,359 | 28,471
Total fair value | 153,606 | 168,456
Fair Value | 162,651 | 179,990
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 96,344 | 144,022
Amortized Cost | 96,344 | 144,022
Investment securities, held to maturity | 1,007 | 2,661
Investment securities, available for sale | 98,622 | 147,453
Fair Value | 1,023 | 2,697
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 165,016 | 114,484
Amortized Cost | 165,016 | 114,484
Investment securities, held to maturity | 3,733 | 8,594
Investment securities, available for sale | 167,510 | 118,799
Fair Value | 3,908 | 8,837
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 33,074 | 0
Amortized Cost | 33,074 |
Investment securities, held to maturity | 4,114 | 0
Investment securities, available for sale | 33,568 | 0
Fair Value | $ 4,114 | $ 0

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