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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 1,428 | $ 22,980
Amortized cost one to five years | 268,961 | 156,677
Amortized cost for five to ten years | 296,072 | 315,630
Amortized cost for after ten years | 322,823 | 340,539
Available for sale | 889,284 | 835,826
Amortized Cost | 1,186,135 | 1,153,611
Within one year, amortized cost | 28,419 | 5,222
One to five years, amortized cost | 199,131 | 65,739
Five to ten years, amortized cost | 331,620 | 273,720
After ten years, amortized cost | 988,992 | 870,896
Total amortized cost | 1,548,162 | 1,215,577
Investment securities, held to maturity | 2,006,129 | 1,552,443
Fair value within one year | 1,406 | 22,984
Fair value for one to five years | 259,422 | 156,397
Fair value for five to ten years | 279,023 | 316,125
Fair value for after ten years | 292,001 | 346,038
Total fair value | 831,852 | 841,544
Investment securities, available for sale | 1,112,512 | 1,160,812
Within one year, fair value | 28,409 | 5,265
One to five years, fair value | 194,886 | 66,982
Five to ten years, fair value | 314,127 | 275,308
After ten years, fair value | 868,008 | 880,830
Total fair value | 1,405,430 | 1,228,385
Fair Value | 1,827,845 | 1,559,991
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 50,201 | 60,600
Amortized Cost | 50,201 | 60,600
Investment securities, held to maturity | 56,841 | 48,482
Investment securities, available for sale | 49,592 | 61,577
Fair Value | 52,605 | 47,465
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 216,411 | 225,329
Amortized Cost | 216,411 | 225,329
Investment securities, held to maturity | 302,407 | 188,426
Investment securities, available for sale | 202,435 | 226,074
Fair Value | 279,050 | 185,965
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 30,239 | 31,856
Amortized Cost | 30,239 | 31,856
Investment securities, held to maturity | 98,719 | 99,958
Investment securities, available for sale | 28,633 | 31,617
Fair Value | $ 90,760 | $ 98,176

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