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Investment Securities - Schedule of Amortized Cost of Securities and Fair Values (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
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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

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- Definition 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). + References 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 + Details
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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 + Details
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- Definition 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 + Details
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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 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 + Details
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