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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 USD ($) security | Sep. 30, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
Securities in the available-for-sale portfolio in a continuous loss position |  |  |
Number of individual securities in a continuous loss position | security | 140 | 140 | 159
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses | $ (275,000) | $ (275,000) | $ (4,775,000)
12 Months or More Unrealized Losses | (195,078,000) | (195,078,000) | (259,563,000)
Total Unrealized Losses | (195,353,000) | (195,353,000) | (264,338,000)
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value | 74,368,000 | 74,368,000 | 277,688,000
12 Months or More Fair Value | 1,343,052,000 | 1,343,052,000 | 1,443,285,000
Total Fair Value | 1,417,420,000 | $ 1,417,420,000 | $ 1,720,973,000
Number of securities with intent to sell |  | 0 | 0
Credit losses recognized on securities | 0 | $ 0 | $ 0
Allowance for credit losses, investment securities | 0 | $ 0 | $ 0
Investment securities comprised of collateralized loan obligations rated AA or better, obligations issued by local state and political subdivisions rated AA or better and non-agency commercial mortgage-backed securities rated AAA |  | 5.00% | 5.00%
Government agency debt securities |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
12 Months or More Unrealized Losses |  |  | $ (23,000)
Total Unrealized Losses |  |  | (23,000)
Time in Continuous Loss, Fair Value |  |  |
12 Months or More Fair Value |  |  | 8,147,000
Total Fair Value |  |  | 8,147,000
Residential - Government agency |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses |  |  | (154,000)
12 Months or More Unrealized Losses | (1,086,000) | $ (1,086,000) | (1,460,000)
Total Unrealized Losses | (1,086,000) | (1,086,000) | (1,614,000)
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value |  |  | 27,127,000
12 Months or More Fair Value | 8,395,000 | 8,395,000 | 8,732,000
Total Fair Value | 8,395,000 | 8,395,000 | 35,859,000
Residential - Government-sponsored enterprises |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses | (233,000) | (233,000) | (2,997,000)
12 Months or More Unrealized Losses | (66,020,000) | (66,020,000) | (99,726,000)
Total Unrealized Losses | (66,253,000) | (66,253,000) | (102,723,000)
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value | 51,145,000 | 51,145,000 | 116,084,000
12 Months or More Fair Value | 572,041,000 | 572,041,000 | 622,029,000
Total Fair Value | 623,186,000 | 623,186,000 | 738,113,000
Commercial - Government agency |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
12 Months or More Unrealized Losses | (48,312,000) | (48,312,000) | (53,223,000)
Total Unrealized Losses | (48,312,000) | (48,312,000) | (53,223,000)
Time in Continuous Loss, Fair Value |  |  |
12 Months or More Fair Value | 191,167,000 | 191,167,000 | 196,125,000
Total Fair Value | 191,167,000 | 191,167,000 | 196,125,000
Commercial - Government-sponsored enterprises |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
12 Months or More Unrealized Losses | (1,548,000) | (1,548,000) | (3,107,000)
Total Unrealized Losses | (1,548,000) | (1,548,000) | (3,107,000)
Time in Continuous Loss, Fair Value |  |  |
12 Months or More Fair Value | 42,213,000 | 42,213,000 | 44,908,000
Total Fair Value | 42,213,000 | 42,213,000 | 44,908,000
Commercial - Non-agency |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses | (24,000) | (24,000) |
Total Unrealized Losses | (24,000) | (24,000) |
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value | 7,020,000 | 7,020,000 |
Total Fair Value | 7,020,000 | 7,020,000 |
Government agency |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses | (18,000) | (18,000) | (712,000)
12 Months or More Unrealized Losses | (40,437,000) | (40,437,000) | (54,202,000)
Total Unrealized Losses | (40,455,000) | (40,455,000) | (54,914,000)
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value | 16,203,000 | 16,203,000 | 76,968,000
12 Months or More Fair Value | 292,492,000 | 292,492,000 | 310,171,000
Total Fair Value | 308,695,000 | 308,695,000 | 387,139,000
Government-sponsored enterprises |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |
Less Than 12 Months Unrealized Losses |  |  | (912,000)
12 Months or More Unrealized Losses | (37,675,000) | (37,675,000) | (47,822,000)
Total Unrealized Losses | (37,675,000) | (37,675,000) | (48,734,000)
Time in Continuous Loss, Fair Value |  |  |
Less Than 12 Months Fair Value |  |  | 57,509,000
12 Months or More Fair Value | 236,744,000 | 236,744,000 | 253,173,000
Total Fair Value | $ 236,744,000 | $ 236,744,000 | $ 310,682,000

X
- Definition Represents the percentage of a portfolio's securities that consist of: (1) collateralized loan obligations (CLOs), (2) obligations issued by U.S. local or state governments and political subdivisions, and (3) non-agency commercial mortgage-backed securities (CMBS). This percentage reflects exposure to these asset types within the investment portfolio. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (loss) (available-for-sale), in continuous unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References No definition available. + Details
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- Definition Amount of increase (decrease) in 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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