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Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Narrative (Details)	3 Months Ended		6 Months Ended
Investments - Narrative (Details)	Jun. 30, 2026 USD ($) security	Jun. 30, 2025 USD ($) security	Jun. 30, 2026 USD ($) security	Jun. 30, 2025 USD ($) security	Dec. 31, 2025 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Accrued interest receivable on available-for-sale securities	$ 5,500,000		$ 5,500,000		$ 5,100,000
Unrealized losses			0
Investment securities, fair value	1,467,855,000		1,467,855,000		1,427,401,000
Carrying value and amortized cost	1,537,038,000		1,537,038,000		1,486,194,000
Unrealized gains on equity securities	0	$ 959,000	0	$ 966,000
Collateral Pledged
Debt Securities, Available-for-Sale [Line Items]
Investment securities, fair value	508,400,000		508,400,000		565,800,000
Carrying value and amortized cost	$ 553,300,000		$ 553,300,000		$ 610,100,000
Sale Of Available-for-Sale Securities
Debt Securities, Available-for-Sale [Line Items]
Number of investment securities sold \| security	8	4	18	7
Proceeds from sale of investment securities	$ 15,700,000	$ 11,300,000	$ 33,700,000	$ 16,900,000
Maturities Of Available-for-Sale Securities
Debt Securities, Available-for-Sale [Line Items]
Number of investment securities sold \| security		1		1
Proceeds from sale of investment securities		$ 4,000,000.0		$ 4,000,000.0
Mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Number of securities in unrealized loss portions for longer than 12 months \| security	330		330		357
Number of securities in unrealized loss positions for less than 12 months \| security	94		94		18
Investment securities, fair value	$ 1,444,667,000		$ 1,444,667,000		$ 1,410,679,000
Carrying value and amortized cost	$ 1,513,619,000		$ 1,513,619,000		$ 1,469,440,000
U.S. government agencies
Debt Securities, Available-for-Sale [Line Items]
Number of securities in unrealized loss portions for longer than 12 months \| security	1		1		1
Number of securities in unrealized loss positions for less than 12 months \| security	4		4
Investment securities, fair value	$ 20,132,000		$ 20,132,000		$ 13,617,000
Carrying value and amortized cost	$ 20,280,000		$ 20,280,000		$ 13,603,000
Municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Number of securities in unrealized loss portions for longer than 12 months \| security	2		2		1
Number of securities in unrealized loss positions for less than 12 months \| security	1		1		2
Investment securities, fair value	$ 3,056,000		$ 3,056,000		$ 3,105,000
Carrying value and amortized cost	$ 3,139,000		$ 3,139,000		$ 3,151,000