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Derivatives - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	Sep. 30, 2025 USD ($) derivative	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) derivative	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) derivative	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Derivatives, Fair Value [Line Items]
Number of fixed portfolio layer method fair value swaps | derivative								5
Gain (Loss)					$ (977)		$ 5,998
Amortization adjustment					$ 33,100
Fair value, net derivative asset (liability), recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income flag					Noninterest income
Fair value of embedded derivative							648	$ 648	$ 648	$ 648
Realized and unrealized gain (loss) included in earnings			$ 0	$ 0	$ 0	$ 0
Fixed rate mortgages
Derivatives, Fair Value [Line Items]
Number of fixed portfolio layer method fair value swaps | derivative								4
Notional amount	$ 30,000	$ 250,000
Payments for settlement on termination of derivative		2,100
Gain (Loss)							100	$ (500)
Increase (decrease) in basis adjustment		$ 1,700
Basis adjustment remaining					1,500
Fixed rate bonds
Derivatives, Fair Value [Line Items]
Number of fixed portfolio layer method fair value swaps | derivative								1
Derivative sold			$ 35,200		$ 35,200
Fixed Rate Municipal Bonds
Derivatives, Fair Value [Line Items]
Number of fixed portfolio layer method fair value swaps | derivative			2		2
Notional amount	50,000		$ 86,900		$ 86,900
Payments for settlement on termination of derivative	500
Increase (decrease) in basis adjustment	$ 500
Basis adjustment remaining					$ 100
Number of fixed portfolio layer method fair value swaps that are amortizing | derivative			1		1
Embedded derivative
Derivatives, Fair Value [Line Items]
Fair value of embedded derivative			$ 600		$ 600		$ 600

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