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Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Amortized cost |  |
Amortized cost, due in one year or less | $ 18,861 | $ 1,148
Amortized costs, due in one to five years | 29,353 | 11,553
Amortized cost, due in five to ten years | 30,513 | 18,287
Amortized cost, due in over ten years | 306,515 | 158,616
Amortized cost, total | 385,242 | 189,604
Amortized cost | 1,129,053 | 676,705
Fair value |  |
Fair value, due in one year or less | 19,009 | 1,152
Fair value, due in one to five years | 29,811 | 11,676
Fair value, due in five to ten years | 31,676 | 18,887
Fair value, due in over ten years | 320,065 | 165,990
Fair value, total | 400,561 | 197,705
Total debt securities, Fair value | 1,160,521 | 688,381
Mortgage-backed securities - residential |  |
Amortized cost |  |
Amortized cost | 723,333 | 474,144
Amortized cost | 723,333 | 474,144
Fair value |  |
Fair value | 738,106 | 477,312
Total debt securities, Fair value | 738,106 | 477,312
Mortgage-backed securities - commercial |  |
Amortized cost |  |
Amortized cost | 20,478 | 12,957
Amortized cost | 20,478 | 12,957
Fair value |  |
Fair value | 21,854 | 13,364
Total debt securities, Fair value | $ 21,854 | $ 13,364

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- Definition Amortized cost 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 second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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