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Investment Securities - Schedule of Gross Unrealized Losses and Fair Value by Length of Time that the Individual Available-For-Sale Securities Have Been in a Continuous Unrealized Loss (Details) $ in Thousands | Mar. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 254 | 260
Less than 12 months, estimated fair value | $ 499,312 | $ 495,164
Less than 12 months, unrealized losses | (50,108) | (58,439)
12 months or greater, estimated fair value | 1,082,828 | 1,093,919
12 months or greater, unrealized losses | (131,123) | (146,839)
Estimated fair value | 1,582,140 | 1,589,083
Unrealized losses | $ (181,231) | $ (205,278)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security | 234 | 232
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value | $ 24,489 | $ 23,881
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | (2,625) | (3,228)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value | 941,297 | 932,753
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (108,900) | (122,205)
Debt securities, held-to-maturity, unrealized loss position, fair value | 965,786 | 956,634
Gross unrealized losses | $ (111,525) | $ (125,433)
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 2 | 2
Less than 12 months, estimated fair value | $ 0 | $ 0
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 46,931 | 46,327
12 months or greater, unrealized losses | (2,887) | (3,466)
Estimated fair value | 46,931 | 46,327
Unrealized losses | $ (2,887) | $ (3,466)
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 79 | 85
Less than 12 months, estimated fair value | $ 499,312 | $ 490,699
Less than 12 months, unrealized losses | (50,108) | (58,437)
12 months or greater, estimated fair value | 175,155 | 179,029
12 months or greater, unrealized losses | (17,119) | (19,612)
Estimated fair value | 674,467 | 669,728
Unrealized losses | $ (67,227) | $ (78,049)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 158 | 157
Less than 12 months, estimated fair value | $ 0 | $ 3,994
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 800,166 | 808,697
12 months or greater, unrealized losses | (105,358) | (117,072)
Estimated fair value | 800,166 | 812,691
Unrealized losses | $ (105,358) | $ (117,072)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security | 143 | 143
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value | $ 0 | $ 0
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | 0 | 0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value | 647,470 | 652,667
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (77,286) | (88,390)
Debt securities, held-to-maturity, unrealized loss position, fair value | 647,470 | 652,667
Gross unrealized losses | $ (77,286) | $ (88,390)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 13 | 14
Less than 12 months, estimated fair value | $ 0 | $ 471
Less than 12 months, unrealized losses | 0 | (2)
12 months or greater, estimated fair value | 50,282 | 49,742
12 months or greater, unrealized losses | (5,139) | (5,856)
Estimated fair value | 50,282 | 50,213
Unrealized losses | $ (5,139) | $ (5,858)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security | 16 | 16
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value | $ 0 | $ 0
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | 0 | 0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value | 80,907 | 80,564
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (11,234) | (11,993)
Debt securities, held-to-maturity, unrealized loss position, fair value | 80,907 | 80,564
Gross unrealized losses | $ (11,234) | $ (11,993)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 1 | 1
Less than 12 months, estimated fair value | $ 0 | $ 0
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 8,482 | 8,299
12 months or greater, unrealized losses | (432) | (658)
Estimated fair value | 8,482 | 8,299
Unrealized losses | (432) | $ (658)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |  | 43
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |  | $ 3,110
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |  | (45)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |  | 113,071
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |  | (12,047)
Debt securities, held-to-maturity, unrealized loss position, fair value |  | 116,181
Gross unrealized losses | $ (8,690) | $ (12,092)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 1 | 1
Less than 12 months, estimated fair value | $ 0 | $ 0
Less than 12 months, unrealized losses | 0 | 0
12 months or greater, estimated fair value | 1,812 | 1,825
12 months or greater, unrealized losses | (188) | (175)
Estimated fair value | 1,812 | 1,825
Unrealized losses | $ (188) | $ (175)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security | 32 | 30
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value | $ 21,367 | $ 20,771
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | (2,596) | (3,183)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value | 96,572 | 86,451
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (11,719) | (9,775)
Debt securities, held-to-maturity, unrealized loss position, fair value | 117,939 | 107,222
Gross unrealized losses | $ (14,315) | $ (12,958)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security | 43 |
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value | $ 3,122 |
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | (29) |
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value | 116,348 |
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (8,661) |
Debt securities, held-to-maturity, unrealized loss position, fair value | 119,470 |
Gross unrealized losses | $ (8,690) |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + 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 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + 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 unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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