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Investment Securities - Summary of Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 152 | $ 353,658
Less than 12 months, Unrealized losses | (5) | (32,220)
12 months or more, Fair Value | 616,587 | 350,749
12 months or more, Unrealized Loss | (128,042) | (81,254)
Total, Fair Value | 616,739 | 704,407
Total, Unrealized losses | (128,047) | (113,474)
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value |  | 71,388
Less than 12 months, Unrealized losses |  | (2,643)
12 months or more, Fair Value | 71,862 |
12 months or more, Unrealized Loss | (2,524) |
Total, Fair Value | 71,862 | 71,388
Total, Unrealized losses | (2,524) | (2,643)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 16 | 83,748
Less than 12 months, Unrealized losses | (1) | (6,686)
12 months or more, Fair Value | 193,918 | 141,272
12 months or more, Unrealized Loss | (43,457) | (31,123)
Total, Fair Value | 193,934 | 225,020
Total, Unrealized losses | (43,458) | (37,809)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 136 | 196,449
Less than 12 months, Unrealized losses | (4) | (22,809)
12 months or more, Fair Value | 348,806 | 209,477
12 months or more, Unrealized Loss | (81,907) | (50,131)
Total, Fair Value | 348,942 | 405,926
Total, Unrealized losses | (81,911) | (72,940)
Municipal Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value |  | 153
Less than 12 months, Unrealized losses |  | (2)
12 months or more, Fair Value | 152 |
12 months or more, Unrealized Loss | (3) |
Total, Fair Value | 152 | 153
Total, Unrealized losses | (3) | (2)
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value |  | 1,920
Less than 12 months, Unrealized losses |  | (80)
12 months or more, Fair Value | 1,849 |
12 months or more, Unrealized Loss | (151) |
Total, Fair Value | 1,849 | 1,920
Total, Unrealized losses | $ (151) | $ (80)

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in twelve months or greater. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: 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 2: 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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