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Investment Securities - Narrative (Details) | 9 Months Ended |
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Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) security
Investment Securities |  |  |
Investment securities available-for-sale | $ 1,739,423,000 |  | $ 895,034,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | (37,800,000) |  | (69,400,000)
Debt securities, available-for-sale, unrealized loss position | $ 825,592,000 |  | $ 705,274,000
Percentage of securities in unrealized loss positions, available-for-sale securities | 47.50% |  | 78.80%
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ 49,239,000 |  | $ 70,222,000
Accrued interest receivable | $ 8,000,000.0 |  | 4,100,000
Number of days past due to be placed in nonaccrual status | 90 days |  |
Purchases of securities available-for-sale | $ 11,737,000 | $ 69,856,000 |
Estimated fair value of debt securities have right to call or prepay the obligations | 437,500,000 |  | 118,600,000
Estimated fair value of debt securities that have right to call or prepay the obligations, scheduled maturities of less than one year | 24,200,000 |  | 4,800,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of after one year through five years | 71,500,000 |  | 67,400,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities after six years through ten years | 72,200,000 |  | 38,900,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of which is after ten years | 269,600,000 |  | 7,500,000
Proceeds from sale of investment securities available-for-sale | 176,312,000 | 0 |
Gain (loss) on sale of securities | 0 |  |
US Government Sponsored Enterprises |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 249,200,000 |  | 36,900,000
GSE debentures |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 328,351,000 |  | 176,294,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ (13,400,000) |  | $ (18,800,000)
AFS number of positions | security | 67 |  | 34
Number of securities in unrealized loss positions | security | 51 |  | 23
Purchases of securities available-for-sale | $ 0 | 0 |
GSE CMOs |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 339,700,000 |  | $ 55,500,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ (4,000,000.0) |  | $ (7,000,000.0)
AFS number of positions | security | 106 |  | 59
Number of securities in unrealized loss positions | security | 57 |  | 57
Purchases of securities available-for-sale | $ 0 | 0 |
GSE MBSs |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 332,400,000 |  | $ 148,300,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ (11,300,000) |  | $ (18,600,000)
AFS number of positions | security | 193 |  | 141
Number of securities in unrealized loss positions | security | 96 |  | 92
Purchases of securities available-for-sale | $ 0 | 4,100,000 |
Municipal obligations |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 235,434,000 |  | $ 20,254,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ 4,700,000 |  | $ (300,000)
AFS number of positions | security | 252 |  | 39
Number of securities in unrealized loss positions | security | 21 |  | 13
Purchases of securities available-for-sale | $ 1,300,000 | 7,300,000 |
Corporate debt obligations |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 48,255,000 |  | $ 12,287,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ 100,000 |  | $ 100,000
AFS number of positions | security | 25 |  | 4
Number of securities in unrealized loss positions | security | 4 |  | 1
Purchases of securities available-for-sale | $ 0 | 0 |
U.S. Treasury bonds |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | 454,800,000 |  | $ 481,900,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) | $ (13,900,000) |  | $ (24,800,000)
AFS number of positions | security | 59 |  | 65
Number of securities in unrealized loss positions | security | 33 |  | 50
Purchases of securities available-for-sale | $ 9,900,000 | $ 58,400,000 |
Foreign government obligations |  |  |
Investment Securities |  |  |
Investment securities available-for-sale | $ 500,000 |  | $ 499,000
AFS number of positions | security | 1 |  | 1
Collateral Pledged |  |  |
Investment Securities |  |  |
Investment securities pledged as collateral | $ 1,300,000,000 |  | $ 792,000,000.0
Outstanding borrowings | $ 0 |  | $ 0

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