Investment Securities - Schedule of Amortized Cost, Allowance for Credit Losses and Fair Value (Details) - USD ($)	Sep. 30, 2026	Dec. 31, 2025
Investment Securities
Amortized cost	$ 1,623,908,000	$ 1,507,466,000
Gross unrealized gains	906,000	1,780,000
Gross unrealized losses	(86,684,000)	(49,667,000)
Allowance for credit losses on investments	0	0
Fair Value	1,538,130,000	1,459,579,000
U.S. government agency securities
Investment Securities
Amortized cost	791,979,000	672,110,000
Gross unrealized gains	893,000	163,000
Gross unrealized losses	(2,885,000)	(2,185,000)
Allowance for credit losses on investments	0	0
Fair Value	789,987,000	670,088,000
Mortgage-backed securities - residential
Investment Securities
Amortized cost	616,975,000	631,104,000
Gross unrealized gains	12,000	897,000
Gross unrealized losses	(48,467,000)	(29,681,000)
Allowance for credit losses on investments	0	0
Fair Value	568,520,000	602,320,000
Mortgage-backed securities - commercial
Investment Securities
Amortized cost	19,868,000	11,164,000
Gross unrealized gains	0	0
Gross unrealized losses	(1,224,000)	(486,000)
Allowance for credit losses on investments	0	0
Fair Value	18,644,000	10,678,000
Municipal securities
Investment Securities
Amortized cost	186,216,000	185,000,000
Gross unrealized gains	1,000	683,000
Gross unrealized losses	(33,892,000)	(17,313,000)
Allowance for credit losses on investments	0	0
Fair Value	152,325,000	168,370,000
U.S. Treasury securities
Investment Securities
Amortized cost	7,170,000	7,088,000
Gross unrealized gains	0	37,000
Gross unrealized losses	(206,000)	0
Allowance for credit losses on investments	0	0
Fair Value	6,964,000	7,125,000
Corporate securities
Investment Securities
Amortized cost	1,700,000	1,000,000
Gross unrealized gains	0	0
Gross unrealized losses	(10,000)	(2,000)
Allowance for credit losses on investments	0	0
Fair Value	$ 1,690,000	$ 998,000

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amortized cost excluding accrued interest, before 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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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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