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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 379 | 66
Less than 12 months, estimated fair value | $ 827,773 | $ 222,354
Less than 12 months, unrealized losses | 17,926 | 857
12 months or greater, estimated fair value | 43,889 | 47,739
12 months or greater, unrealized losses | 573 | 611
Estimated fair value | 871,662 | 270,093
Unrealized losses | $ 18,499 | $ 1,468
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 50 | 28
Less than 12 months, estimated fair value | $ 197,761 | $ 46,412
Less than 12 months, unrealized losses | 5,346 | 67
12 months or greater, estimated fair value | 38,854 | 41,320
12 months or greater, unrealized losses | 513 | 560
Estimated fair value | 236,615 | 87,732
Unrealized losses | $ 5,859 | $ 627
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 267 | 35
Less than 12 months, estimated fair value | $ 579,364 | $ 170,178
Less than 12 months, unrealized losses | 11,646 | 782
12 months or greater, estimated fair value | 5,035 | 6,419
12 months or greater, unrealized losses | 60 | 51
Estimated fair value | 584,399 | 176,597
Unrealized losses | $ 11,706 | $ 833
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 16 |
Less than 12 months, estimated fair value | $ 23,763 |
Less than 12 months, unrealized losses | 481 |
12 months or greater, estimated fair value | 0 |
12 months or greater, unrealized losses | 0 |
Estimated fair value | 23,763 |
Unrealized losses | $ 481 |
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities | security | 46 | 3
Less than 12 months, estimated fair value | $ 26,885 | $ 5,764
Less than 12 months, unrealized losses | 453 | 8
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated fair value | 26,885 | 5,764
Unrealized losses | $ 453 | $ 8

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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=121582814&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=121645371&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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- 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 http://asc.fasb.org/extlink&oid=121645371&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 http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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