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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 1,535 | $ 22,980
Amortized cost one to five years | 340,212 | 156,677
Amortized cost for five to ten years | 238,045 | 315,630
Amortized cost for after ten years | 303,936 | 340,539
Available for sale | 883,728 | 835,826
Amortized Cost | 1,137,702 | 1,153,611
Within one year, amortized cost | 32,610 | 5,222
One to five years, amortized cost | 222,443 | 65,739
Five to ten years, amortized cost | 324,967 | 273,720
After ten years, amortized cost | 1,006,745 | 870,896
Total amortized cost | 1,586,765 | 1,215,577
Investment securities, held to maturity | 2,022,748 | 1,552,443
Fair value within one year | 1,512 | 22,984
Fair value for one to five years | 312,137 | 156,397
Fair value for five to ten years | 204,282 | 316,125
Fair value for after ten years | 257,756 | 346,038
Total fair value | 775,687 | 841,544
Investment securities, available for sale | 997,558 | 1,160,812
Within one year, fair value | 32,382 | 5,265
One to five years, fair value | 209,854 | 66,982
five to ten years, fair value | 280,618 | 275,308
After ten years, fair value | 793,544 | 880,830
Total fair value | 1,316,398 | 1,228,385
Fair Value | 1,681,309 | 1,559,991
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 33,011 | 60,600
Amortized Cost | 33,011 | 60,600
Investment securities, held to maturity | 56,564 | 48,482
Investment securities, available for sale | 31,215 | 61,577
Fair Value | 47,699 | 47,465
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 220,963 | 257,185
Amortized Cost | 220,963 | 257,185
Investment securities, held to maturity | 343,953 | 247,937
Investment securities, available for sale | 190,656 | 257,691
Fair Value | 287,239 | 244,136
Private labeled mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 0
Investment securities, held to maturity | 35,466 | 40,447
Investment securities, available for sale |  | 0
Fair Value | $ 29,973 | $ 40,005

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