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v3.22.2.2

Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | $ 2,321,695,000 |  | $ 2,321,695,000 |  | $ 2,685,648,000
Gross Unrealized Gains | 9,000 |  | 9,000 |  | 16,266,000
Gross Unrealized Losses | (328,356,000) |  | (328,356,000) |  | (35,639,000)
Fair Value | 1,993,348,000 |  | 1,993,348,000 |  | 2,666,275,000
Debt Securities, Held-to-maturity, Fair Value | 258,677,000 |  | 258,677,000 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 12,508,000 |  | 12,508,000 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively | 271,185,000 |  | 271,185,000 |  | 0
Fair value of debt securities transferred from available for sale to held to maturity | 238,900,000 |  |  |  |
Debt Securities, Transfer from available for sale to held to maturity, amortized cost, before allowance for credit losses | 275,500,000 |  |  |  |
Unrealized loss on debt securities transferred from available for sale to held to maturity | (36,600,000) |  |  |  |
Net gains on sales of securities available for sale | 0 | $ 0 | 0 | $ 0 |
Unrealized gains on securities available for sale net of taxes | (236,535,000) |  | (236,535,000) |  | (11,412,000)
Accrued interest receivable for investment securities available for sale | 6,500,000 |  | 6,500,000 |  | 5,600,000
Debt Securities, Available For Sale and Held to Maturity, Restricted | 369,500,000 |  | 369,500,000 |  | 362,200,000
Due within one year | 2,616,000 |  | 2,616,000 |  |
Due within one year | 2,565,000 |  | 2,565,000 |  |
Due within one year | 0 |  | 0 |  |
Due within one year | 0 |  | 0 |  |
Due after one year through five years | 102,687,000 |  | 102,687,000 |  |
Due after one year through five years | 95,593,000 |  | 95,593,000 |  |
Due after one year through five years | 0 |  | 0 |  |
Due after one year through five years | 0 |  | 0 |  |
Due after five years through ten years | 159,709,000 |  | 159,709,000 |  |
Due after five years through ten years | 143,728,000 |  | 143,728,000 |  |
Due after five years through ten years | 36,906,000 |  | 36,906,000 |  |
Due after five years through ten years | 35,677,000 |  | 35,677,000 |  |
Due after ten years | 2,056,683,000 |  | 2,056,683,000 |  |
Due after ten years | 1,751,462,000 |  | 1,751,462,000 |  |
Due after ten years | 234,279,000 |  | 234,279,000 |  |
Due after ten years | 223,000,000 |  | 223,000,000 |  |
Total | 271,185,000 |  | 271,185,000 |  |
Total | 258,677,000 |  | 258,677,000 |  |
Available-for-sale Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized gains on securities available for sale net of taxes | (230,800,000) |  | (230,800,000) |  | (13,000,000)
Collateralized mortgage obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 974,052,000 |  | 974,052,000 |  | 1,039,543,000
Gross Unrealized Gains | 9,000 |  | 9,000 |  | 3,357,000
Gross Unrealized Losses | (149,734,000) |  | (149,734,000) |  | (16,470,000)
Fair Value | 824,327,000 |  | 824,327,000 |  | 1,026,430,000
Mortgage-backed securities: Residential |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 555,997,000 |  | 555,997,000 |  | 769,113,000
Gross Unrealized Gains | 0 |  | 0 |  | 1,985,000
Gross Unrealized Losses | (99,407,000) |  | (99,407,000) |  | (11,874,000)
Fair Value | 456,590,000 |  | 456,590,000 |  | 759,224,000
Debt Securities, Held-to-maturity, Fair Value | 151,698,000 |  | 151,698,000 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 7,840,000 |  | 7,840,000 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively | 159,538,000 |  | 159,538,000 |  |
Mortgage-backed securities: Commercial |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 426,483,000 |  | 426,483,000 |  | 595,659,000
Gross Unrealized Gains | 0 |  | 0 |  | 9,103,000
Gross Unrealized Losses | (46,868,000) |  | (46,868,000) |  | (5,360,000)
Fair Value | 379,615,000 |  | 379,615,000 |  | 599,402,000
Debt Securities, Held-to-maturity, Fair Value | 106,979,000 |  | 106,979,000 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 4,668,000 |  | 4,668,000 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively | 111,647,000 |  | 111,647,000 |  |
Corporate securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 23,362,000 |  | 23,362,000 |  | 23,398,000
Gross Unrealized Gains | 0 |  | 0 |  | 130,000
Gross Unrealized Losses | (4,647,000) |  | (4,647,000) |  | (1,044,000)
Fair Value | 18,715,000 |  | 18,715,000 |  | 22,484,000
Municipal securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 180,265,000 |  | 180,265,000 |  | 104,371,000
Gross Unrealized Gains | 0 |  | 0 |  | 1,680,000
Gross Unrealized Losses | (17,831,000) |  | (17,831,000) |  | (767,000)
Fair Value | 162,434,000 |  | $ 162,434,000 |  | $ 105,284,000
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Maximum exposure to any single issuer |  |  | 10.00% |  | 10.00%
Asset-backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 153,548,000 |  | $ 153,548,000 |  | $ 153,564,000
Gross Unrealized Gains | 0 |  | 0 |  | 11,000
Gross Unrealized Losses | (9,645,000) |  | (9,645,000) |  | (124,000)
Fair Value | 143,903,000 |  | 143,903,000 |  | $ 153,451,000
US Treasury Notes Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 3,988,000 |  | 3,988,000 |  |
Gross Unrealized Gains | 0 |  | 0 |  |
Gross Unrealized Losses | (99,000) |  | (99,000) |  |
Fair Value | 3,889,000 |  | 3,889,000 |  |
Agency Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 4,000,000 |  | 4,000,000 |  |
Gross Unrealized Gains | 0 |  | 0 |  |
Gross Unrealized Losses | (125,000) |  | (125,000) |  |
Fair Value | $ 3,875,000 |  | $ 3,875,000 |  |

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