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Fair Value of Financial Instruments and Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Assets |  |
Cash and short-term investments | $ 176,997 | $ 183,506
Investment securities available for sale, at fair value | 820,625 | 380,814
Other investments, at cost | 13,977 | 3,296
Loans held for sale | 26,697 | 52,386
Loans, net | 1,296,983 | 1,047,376
Liabilities |  |
Deposits | 2,195,122 | 1,445,027
Federal Home Loan Bank advances | 51,601 | 22,500
Carrying Value | Paycheck Protection Program Liquidity Facility |  |
Liabilities |  |
Long-term debt |  | 106,789
Carrying Value | Other borrowings |  |
Liabilities |  |
Long-term debt | 37,042 | 37,792
Estimated Fair Value |  |
Assets |  |
Cash and short-term investments | 176,997 | 183,506
Investment securities available for sale, at fair value | 820,625 | 380,814
Other investments, at cost | 13,977 | 3,296
Loans held for sale | 26,697 | 52,386
Loans, net | 1,303,994 | 1,063,785
Liabilities |  |
Deposits | 2,195,624 | 1,445,984
Federal Home Loan Bank advances | 50,528 | 20,817
Estimated Fair Value | Paycheck Protection Program Liquidity Facility |  |
Liabilities |  |
Long-term debt |  | 106,789
Estimated Fair Value | Other borrowings |  |
Liabilities |  |
Long-term debt | 36,767 | 37,792
Estimated Fair Value | Level 1 |  |
Assets |  |
Cash and short-term investments | 176,997 | 183,506
Investment securities available for sale, at fair value | 42,382 | 245
Other investments, at cost | 0 | 0
Loans held for sale | 0 | 0
Loans, net | 0 | 0
Liabilities |  |
Deposits | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Estimated Fair Value | Level 1 | Paycheck Protection Program Liquidity Facility |  |
Liabilities |  |
Long-term debt |  | 0
Estimated Fair Value | Level 1 | Other borrowings |  |
Liabilities |  |
Long-term debt | 0 | 0
Estimated Fair Value | Level 2 |  |
Assets |  |
Cash and short-term investments | 0 | 0
Investment securities available for sale, at fair value | 778,243 | 380,569
Other investments, at cost | 13,977 | 3,296
Loans held for sale | 26,697 | 52,386
Loans, net | 0 | 0
Liabilities |  |
Deposits | 2,195,624 | 1,445,984
Federal Home Loan Bank advances | 50,528 | 20,817
Estimated Fair Value | Level 2 | Paycheck Protection Program Liquidity Facility |  |
Liabilities |  |
Long-term debt |  | 106,789
Estimated Fair Value | Level 2 | Other borrowings |  |
Liabilities |  |
Long-term debt | 36,767 | 37,792
Estimated Fair Value | Level 3 |  |
Assets |  |
Cash and short-term investments | 0 | 0
Investment securities available for sale, at fair value | 0 | 0
Other investments, at cost | 0 | 0
Loans held for sale | 0 | 0
Loans, net | 1,303,994 | 1,063,785
Liabilities |  |
Deposits | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Estimated Fair Value | Level 3 | Paycheck Protection Program Liquidity Facility |  |
Liabilities |  |
Long-term debt |  |
Estimated Fair Value | Level 3 | Other borrowings |  |
Liabilities |  |
Long-term debt | $ 0 | $ 0

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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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