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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 1,043 | $ 22,980
Amortized cost one to five years | 313,400 | 156,677
Amortized cost for five to ten years | 261,596 | 315,630
Amortized cost for after ten years | 308,374 | 340,539
Available for sale | 884,413 | 835,826
Amortized Cost | 1,147,467 | 1,153,611
Within one year, amortized cost | 32,861 | 5,222
One to five years, amortized cost | 209,055 | 65,739
Five to ten years, amortized cost | 339,857 | 273,720
After ten years, amortized cost | 1,005,745 | 870,896
Total amortized cost | 1,587,518 | 1,215,577
Investment securities, held to maturity | 2,031,536 | 1,552,443
Fair value within one year | 1,030 | 22,984
Fair value for one to five years | 287,251 | 156,397
Fair value for five to ten years | 224,407 | 316,125
Fair value for after ten years | 243,702 | 346,038
Total fair value | 756,390 | 841,544
Investment securities, available for sale | 985,655 | 1,160,812
Within one year, fair value | 32,489 | 5,265
One to five years, fair value | 195,644 | 66,982
Five to ten years, fair value | 290,173 | 275,308
After ten years, fair value | 749,320 | 880,830
Total fair value | 1,267,626 | 1,228,385
Fair Value | 1,640,589 | 1,559,991
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 36,269 | 60,600
Amortized Cost | 36,269 | 60,600
Investment securities, held to maturity | 57,972 | 48,482
Investment securities, available for sale | 34,624 | 61,577
Fair Value | 49,680 | 47,465
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 226,785 | 257,185
Amortized Cost | 226,785 | 257,185
Investment securities, held to maturity | 349,875 | 247,937
Investment securities, available for sale | 194,641 | 257,691
Fair Value | 292,516 | 244,136
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 0
Investment securities, held to maturity | 36,171 | 40,447
Investment securities, available for sale |  | 0
Fair Value | $ 30,767 | $ 40,005

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