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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 22,980 | $ 44,206
Amortized cost one to five years | 156,677 | 61,594
Amortized cost for five to ten years | 315,630 | 136,857
Amortized cost for after ten years | 340,539 | 589,200
Available for sale | 835,826 | 831,857
Amortized Cost | 1,153,611 | 1,090,363
Within one year, amortized cost | 5,222 | 7,302
One to five years, amortized cost | 65,739 | 42,742
Five to ten years, amortized cost | 273,720 | 82,087
After ten years, amortized cost | 870,896 | 25,290
Total amortized cost | 1,215,577 | 157,421
Investment securities, held to maturity | 1,552,443 | 168,676
Fair value within one year | 22,984 | 44,192
Fair value for one to five years | 156,397 | 63,006
Fair value for five to ten years | 316,125 | 145,102
Fair value for after ten years | 346,038 | 615,473
Total fair value | 841,544 | 867,773
Investment securities, available for sale | 1,160,812 | 1,134,025
Within one year, fair value | 5,265 | 7,327
One to five years, fair value | 66,982 | 44,358
five to ten years, fair value | 275,308 | 88,300
After ten years, fair value | 880,830 | 28,471
Total fair value | 1,228,385 | 168,456
Fair Value | 1,559,991 | 179,990
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 60,600 | 144,022
Amortized Cost | 60,600 | 144,022
Investment securities, held to maturity | 48,482 | 2,661
Investment securities, available for sale | 61,577 | 147,453
Fair Value | 47,465 | 2,697
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 225,329 | 114,484
Amortized Cost | 225,329 | 114,484
Investment securities, held to maturity | 188,426 | 8,594
Investment securities, available for sale | 226,074 | 118,799
Fair Value | 185,965 | 8,837
Private labeled mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 31,856 | 0
Amortized Cost | 31,856 |
Investment securities, held to maturity | 99,958 | 0
Investment securities, available for sale | 31,617 | 0
Fair Value | $ 98,176 | $ 0

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