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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 1,228 | $ 22,980
Amortized cost one to five years | 293,825 | 156,677
Amortized cost for five to ten years | 281,389 | 315,630
Amortized cost for after ten years | 309,868 | 340,539
Available for sale | 886,310 | 835,826
Amortized Cost | 1,162,976 | 1,153,611
Within one year, amortized cost | 36,037 | 5,222
One to five years, amortized cost | 202,480 | 65,739
Five to ten years, amortized cost | 349,467 | 273,720
After ten years, amortized cost | 1,007,547 | 870,896
Total amortized cost | 1,595,531 | 1,215,577
Investment securities, held to maturity | 2,052,772 | 1,552,443
Fair value within one year | 1,225 | 22,984
Fair value for one to five years | 276,489 | 156,397
Fair value for five to ten years | 251,923 | 316,125
Fair value for after ten years | 260,612 | 346,038
Total fair value | 790,249 | 841,544
Investment securities, available for sale | 1,041,020 | 1,160,812
Within one year, fair value | 35,818 | 5,265
One to five years, fair value | 195,376 | 66,982
Five to ten years, fair value | 313,467 | 275,308
After ten years, fair value | 809,438 | 880,830
Total fair value | 1,354,099 | 1,228,385
Fair Value | 1,754,214 | 1,559,991
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 41,329 | 60,600
Amortized Cost | 41,329 | 60,600
Investment securities, held to maturity | 59,694 | 48,482
Investment securities, available for sale | 40,286 | 61,577
Fair Value | 53,534 | 47,465
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 235,337 | 257,185
Amortized Cost | 235,337 | 257,185
Investment securities, held to maturity | 360,446 | 247,937
Investment securities, available for sale | 210,485 | 257,691
Fair Value | 313,826 | 244,136
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 0
Investment securities, held to maturity | 37,101 | 40,447
Investment securities, available for sale |  | 0
Fair Value | $ 32,755 | $ 40,005

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