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Summary of Significant Accounting Policies - Impact of Adoption (Details) - USD ($) | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Allowance for credit losses on debt securities | $ 54,000 | $ 58,000 |  |  |
Loans, net of deferred fees | 2,625,987,000 | 31,855,000 | $ 2,534,163,000 |  |
Allowance for credit losses on off-balance sheet credit exposures | 1,078,000 | 679,000 |  |  |
Allowance for credit losses on loans | 44,400,000 | 31,855,000 | 23,285,000 | $ 27,848,000 | $ 19,658,000
Cumulative-effect adjustment as a result of the adoption of ASU 2016-03 | 577,889,000 |  | 576,708,000 | 367,466,000 | 271,239,000
Retained earnings | 94,899,000 |  | 96,741,000 |  |
ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (8,570,000) |  |
Cumulative-effect adjustment as a result of the adoption of ASU 2016-03 | 58,000 |  |  |  |
ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Allowance for credit losses on debt securities |  |  | 58,000 |  |
Loans, net of deferred fees |  |  | 8,570,000 |  |
Allowance for credit losses on off-balance sheet credit exposures | (207,000) |  | (207,000) |  |
Allowance for credit losses on loans |  |  | 8,570,000 |  |
Cumulative-effect adjustment as a result of the adoption of ASU 2016-03 |  |  | 2,359,000 |  |
Retained earnings |  |  | 6,062,000 |  |
ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 23,285,000 |  |
Allowance for credit losses on off-balance sheet credit exposures |  |  | 886,000 |  |
HCC (Parent) |  |  |  |  |
Cumulative-effect adjustment as a result of the adoption of ASU 2016-03 | 577,889,000 |  | 576,708,000 |  |
Commercial |  |  |  |  |
Loans, net of deferred fees |  |  | 603,345,000 |  |
Allowance for credit losses on loans |  |  | 10,453,000 | $ 17,061,000 | $ 10,608,000
Commercial |  |  |  |  |
Loans, net of deferred fees | 846,386,000 | 6,790,000 | 603,345,000 |  |
Allowance for credit losses on loans | 11,587,000 | 6,790,000 | 10,453,000 |  |
Commercial | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | 3,663,000 |  |
Commercial | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | (3,663,000) |  |
Commercial | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 10,453,000 |  |
Commercial | Commercial |  |  |  |  |
Loans, net of deferred fees | 846,386,000 |  | 603,345,000 |  |
CRE - owner occupied |  |  |  |  |
Loans, net of deferred fees | 560,362,000 | 6,994,000 | 548,907,000 |  |
Allowance for credit losses on loans | 8,560,000 | 6,994,000 | 3,825,000 |  |
CRE - owner occupied | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (3,169,000) |  |
CRE - owner occupied | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | 3,169,000 |  |
CRE - owner occupied | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 3,825,000 |  |
CRE - non-owner occupied |  |  |  |  |
Loans, net of deferred fees | 693,103,000 | 11,672,000 | 767,821,000 |  |
Allowance for credit losses on loans | 16,416,000 | 11,672,000 | 3,760,000 |  |
CRE - non-owner occupied | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (7,912,000) |  |
CRE - non-owner occupied | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | 7,912,000 |  |
CRE - non-owner occupied | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 3,760,000 |  |
Land and construction |  |  |  |  |
Loans, net of deferred fees | 144,594,000 | 1,458,000 | 147,189,000 |  |
Allowance for credit losses on loans | 2,509,000 | 1,458,000 | 2,621,000 |  |
Land and construction | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,163,000 |  |
Land and construction | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | (1,163,000) |  |
Land and construction | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 2,621,000 |  |
Home equity |  |  |  |  |
Loans, net of deferred fees | 111,885,000 | 1,321,000 | 151,775,000 |  |
Allowance for credit losses on loans | 1,297,000 | 1,321,000 | 2,244,000 |  |
Home equity | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | 923,000 |  |
Home equity | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | (923,000) |  |
Home equity | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 2,244,000 |  |
Multi-family |  |  |  |  |
Loans, net of deferred fees | 166,425,000 | 1,253,000 | 180,623,000 |  |
Allowance for credit losses on loans | 2,804,000 | 1,253,000 | 57,000 |  |
Multi-family | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (1,196,000) |  |
Multi-family | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | 1,196,000 |  |
Multi-family | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 57,000 |  |
Residential mortgages |  |  |  |  |
Loans, net of deferred fees | 85,116,000 | 678,000 | 100,759,000 |  |
Allowance for credit losses on loans | 943,000 | 678,000 | 243,000 |  |
Residential mortgages | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (435,000) |  |
Residential mortgages | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | 435,000 |  |
Residential mortgages | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | 243,000 |  |
Consumer and other |  |  |  |  |
Loans, net of deferred fees | 18,116,000 | 1,689,000 | 33,744,000 |  |
Allowance for credit losses on loans | 284,000 | $ 1,689,000 | 82,000 |  |
Consumer and other | ASU 2016-03 - Topic 326 |  |  |  |  |
Allowance for credit losses on loans |  |  | (1,607,000) |  |
Consumer and other | ASU 2016-03 - Topic 326 | Restatement Adjustment |  |  |  |  |
Loans, net of deferred fees |  |  | 1,607,000 |  |
Consumer and other | ASU 2016-03 - Topic 326 | Previously Reported |  |  |  |  |
Loans, net of deferred fees |  |  | $ 82,000 |  |
SBA Paycheck Protection Program ("PPP") loans | Commercial |  |  |  |  |
Loans, net of deferred fees | $ 290,679,000 |  |  |  |

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