Investment Securities - Schedule of Amortized Cost of Securities and Fair Values (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	$ 1,673,079,000	$ 1,658,779,000
Gross unrealized gains	3,015,000	840,000
Gross unrealized losses	(108,172,000)	(187,646,000)
Allowance for credit losses on investments	0	0
Fair Value	1,567,922,000	1,471,973,000
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	515,775,000	204,663,000
Gross unrealized gains	1,401,000	470,000
Gross unrealized losses	(343,000)	(1,177,000)
Allowance for credit losses on investments	0	0
Fair Value	516,833,000	203,956,000
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	968,294,000	1,057,389,000
Gross unrealized gains	1,471,000	0
Gross unrealized losses	(90,176,000)	(160,418,000)
Allowance for credit losses on investments	0	0
Fair Value	879,589,000	896,971,000
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	17,147,000	18,186,000
Gross unrealized gains	0	0
Gross unrealized losses	(858,000)	(1,225,000)
Allowance for credit losses on investments	0	0
Fair Value	16,289,000	16,961,000
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	170,865,000	263,312,000
Gross unrealized gains	143,000	370,000
Gross unrealized losses	(16,779,000)	(21,419,000)
Allowance for credit losses on investments	0	0
Fair Value	154,229,000	242,263,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities		111,729,000
Gross unrealized gains		0
Gross unrealized losses		(3,233,000)
Allowance for credit losses on investments		0
Fair Value		108,496,000
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost, AFS debt securities	998,000	3,500,000
Gross unrealized gains	0	0
Gross unrealized losses	(16,000)	(174,000)
Allowance for credit losses on investments	0	0
Fair Value	$ 982,000	$ 3,326,000

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/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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