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Loans and Allowance for Credit Losses on Loans - Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment, Based on the Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment, Based on the Impairment Method |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | $ 1,835 |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 21,450 |  |
Total allowance balance | $ 44,400 | $ 31,855 | 23,285 | $ 27,848 | $ 19,658
Loans, Individually evaluated for impairment |  |  | 10,264 |  |
Loans, Collectively evaluated for impairment |  |  | 2,523,899 |  |
Total loan balance | $ 2,625,987 | $ 31,855 | 2,534,163 |  |
Commercial |  |  |  |  |
Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment, Based on the Impairment Method |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 1,835 |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 8,618 |  |
Total allowance balance |  |  | 10,453 | 17,061 | 10,608
Loans, Individually evaluated for impairment |  |  | 4,810 |  |
Loans, Collectively evaluated for impairment |  |  | 598,535 |  |
Total loan balance |  |  | 603,345 |  |
Real estate |  |  |  |  |
Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment, Based on the Impairment Method |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 12,750 |  |
Total allowance balance |  |  | 12,750 | 10,671 | 8,950
Loans, Individually evaluated for impairment |  |  | 5,454 |  |
Loans, Collectively evaluated for impairment |  |  | 1,891,620 |  |
Total loan balance |  |  | 1,897,074 |  |
Consumer |  |  |  |  |
Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment, Based on the Impairment Method |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 82 |  |
Total allowance balance |  |  | 82 | $ 116 | $ 100
Loans, Collectively evaluated for impairment |  |  | 33,744 |  |
Total loan balance |  |  | $ 33,744 |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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