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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details) $ in Thousands | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 239 | 66
Less than 12 months, estimated fair value | $ 1,891,310 | $ 222,354
Less than 12 months, unrealized losses | 24,285 | 857
12 months or greater, estimated fair value | 177,038 | 47,739
12 months or greater, unrealized losses | 5,322 | 611
Estimated Fair Value | 2,068,348 | 270,093
Unrealized Losses | $ 29,607 | $ 1,468
U.S. Treasury Bond |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 1 |
Less than 12 months, estimated fair value | $ 24,593 |
Less than 12 months, unrealized losses | 257 |
12 months or greater, estimated fair value | 0 |
12 months or greater, unrealized losses | 0 |
Estimated Fair Value | 24,593 |
Unrealized Losses | $ 257 |
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 64 | 28
Less than 12 months, estimated fair value | $ 452,966 | $ 46,412
Less than 12 months, unrealized losses | 6,256 | 67
12 months or greater, estimated fair value | 68,977 | 41,320
12 months or greater, unrealized losses | 1,366 | 560
Estimated Fair Value | 521,943 | 87,732
Unrealized Losses | $ 7,622 | $ 627
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 153 | 35
Less than 12 months, estimated fair value | $ 1,327,519 | $ 170,178
Less than 12 months, unrealized losses | 16,841 | 782
12 months or greater, estimated fair value | 108,061 | 6,419
12 months or greater, unrealized losses | 3,956 | 51
Estimated Fair Value | 1,435,580 | 176,597
Unrealized Losses | $ 20,797 | $ 833
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 8 | 3
Less than 12 months, estimated fair value | $ 20,181 | $ 5,764
Less than 12 months, unrealized losses | 347 | 8
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated Fair Value | 20,181 | 5,764
Unrealized Losses | $ 347 | $ 8
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 13 |
Less than 12 months, estimated fair value | $ 66,051 |
Less than 12 months, unrealized losses | 584 |
12 months or greater, estimated fair value | 0 |
12 months or greater, unrealized losses | 0 |
Estimated Fair Value | 66,051 |
Unrealized Losses | $ 584 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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