Investment Securities - Schedule of Amortized Cost, Allowance for Credit Losses and Fair Value (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 1,400,827,000	$ 1,679,397,000
Gross unrealized gains	788,000	585,000
Gross unrealized losses	(64,050,000)	(141,974,000)
Allowance for credit losses on investments	0	0
Fair Value	1,337,565,000	1,538,008,000
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	642,433,000	564,752,000
Gross unrealized gains	681,000	172,000
Gross unrealized losses	(850,000)	(1,917,000)
Allowance for credit losses on investments	0	0
Fair Value	642,264,000	563,007,000
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Amortized cost	577,970,000	927,883,000
Gross unrealized gains	64,000	393,000
Gross unrealized losses	(36,691,000)	(117,277,000)
Allowance for credit losses on investments	0	0
Fair Value	541,343,000	810,999,000
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Amortized cost	9,362,000	15,965,000
Gross unrealized gains	0	0
Gross unrealized losses	(610,000)	(1,108,000)
Allowance for credit losses on investments	0	0
Fair Value	8,752,000	14,857,000
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	170,062,000	169,498,000
Gross unrealized gains	43,000	20,000
Gross unrealized losses	(25,877,000)	(21,661,000)
Allowance for credit losses on investments	0	0
Fair Value	144,228,000	147,857,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost		299,000
Gross unrealized gains		0
Gross unrealized losses		0
Allowance for credit losses on investments		0
Fair Value		299,000
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,000,000	1,000,000
Gross unrealized gains	0	0
Gross unrealized losses	(22,000)	(11,000)
Allowance for credit losses on investments	0	0
Fair Value	$ 978,000	$ 989,000

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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- Definition

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).

+ References

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- Definition

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/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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