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v3.23.2

Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,233,734,000 |  | $ 2,233,734,000 |  |  | $ 2,289,421,000
Gross Unrealized Gains | 1,082,000 |  | 1,082,000 |  |  | 790,000
Gross Unrealized Losses | (318,230,000) |  | (318,230,000) |  |  | (318,082,000)
Fair Value | 1,916,586,000 |  | 1,916,586,000 |  |  | 1,972,129,000
Amortized Cost | 269,760,000 |  | 269,760,000 |  |  | 271,066,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 1,000
Gross Unrealized Losses | 14,416,000 |  | 14,416,000 |  |  | 12,660,000
Fair Value | 255,344,000 |  | 255,344,000 |  |  | 258,407,000
Accrued interest receivable for investment securities available for sale | 8,500,000 |  | 8,500,000 |  |  | 7,800,000
Unrealized gains on securities available for sale net of taxes | (228,884,000) |  | (228,884,000) |  |  | (230,857,000)
Net gains on sales of securities available for sale | 0 | $ 0 | 0 | $ 0 |  |
Available-for-sale Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Unrealized gains on securities available for sale net of taxes | (223,000,000) |  | (223,000,000) |  |  | (223,100,000)
US Treasury Notes Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,994,000 |  | 3,994,000 |  |  | 3,990,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (90,000) |  | (90,000) |  |  | (104,000)
Fair Value | 3,904,000 |  | 3,904,000 |  |  | 3,886,000
Agency Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 4,000,000 |  | 4,000,000 |  |  | 4,000,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (163,000) |  | (163,000) |  |  | (133,000)
Fair Value | 3,837,000 |  | 3,837,000 |  |  | 3,867,000
Collateralized Mortgage Obligations [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 904,848,000 |  | 904,848,000 |  |  | 947,541,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (153,108,000) |  | (153,108,000) |  |  | (153,842,000)
Fair Value | 751,740,000 |  | 751,740,000 |  |  | 793,699,000
Mortgage-backed securities: Residential |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 522,145,000 |  | 522,145,000 |  |  | 544,084,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (86,997,000) |  | (86,997,000) |  |  | (90,907,000)
Fair Value | 435,148,000 |  | 435,148,000 |  |  | 453,177,000
Amortized Cost | 154,963,000 |  | 154,963,000 |  |  | 157,881,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | 6,919,000 |  | 6,919,000 |  |  | 7,041,000
Fair Value | 148,044,000 |  | 148,044,000 |  |  | 150,840,000
Mortgage-backed securities: Commercial |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 407,972,000 |  | 407,972,000 |  |  | 417,241,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (55,121,000) |  | (55,121,000) |  |  | (48,954,000)
Fair Value | 352,851,000 |  | 352,851,000 |  |  | 368,287,000
Amortized Cost | 114,797,000 |  | 114,797,000 |  |  | 113,185,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 1,000
Gross Unrealized Losses | 7,497,000 |  | 7,497,000 |  |  | 5,619,000
Fair Value | 107,300,000 |  | 107,300,000 |  |  | 107,567,000
Asset-backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 153,536,000 |  | 153,536,000 |  |  | 153,539,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (3,794,000) |  | (3,794,000) |  |  | (5,935,000)
Fair Value | 149,742,000 |  | 149,742,000 |  |  | 147,604,000
Corporate securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 23,326,000 |  | 23,326,000 |  |  | 23,351,000
Gross Unrealized Gains | 0 |  | 0 |  |  | 0
Gross Unrealized Losses | (4,754,000) |  | (4,754,000) |  |  | (4,494,000)
Fair Value | 18,572,000 |  | 18,572,000 |  |  | 18,857,000
Municipal securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 213,913,000 |  | 213,913,000 |  |  | 195,675,000
Gross Unrealized Gains | 1,082,000 |  | 1,082,000 |  |  | 790,000
Gross Unrealized Losses | (14,203,000) |  | (14,203,000) |  |  | (13,713,000)
Fair Value | $ 200,792,000 |  | $ 200,792,000 |  |  | $ 182,752,000
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% |

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