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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Parent |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Actual, Amount | $ 1,115,257 | $ 893,294
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 974,325 | 820,654
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 917,565 | 764,319
Tier 1 Capital (to Average Assets), Actual, Amount | $ 974,325 | $ 820,654
Total Capital (to Risk Weighted Assets), Actual, Ratio | 0.1419 | 0.1542
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1240 | 0.1417
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1167 | 0.1319
Tier 1 Capital (to Average Assets), Actual, Ratio | 0.1014 | 0.0988
Parent | Required for Capital Adequacy Purposes |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | $ 825,234 | $ 608,258
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 668,047 | 492,399
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 550,156 | 405,505
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount | $ 384,337 | $ 332,205
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 0.1050 | 0.1050
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 0.0850 | 0.0850
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 7.00% | 7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio | 0.0400 | 0.0400
Tri Counties Bank |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Actual, Amount | $ 1,107,941 | $ 884,255
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 1,009,577 | 811,713
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 1,009,577 | 811,713
Tier 1 Capital (to Average Assets), Actual, Amount | $ 1,009,577 | $ 811,713
Total Capital (to Risk Weighted Assets), Actual, Ratio | 0.1410 | 0.1528
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1285 | 0.1403
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1285 | 0.1403
Tier 1 Capital (to Average Assets), Actual, Ratio | 0.1051 | 0.0977
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 785,751 | $ 578,676
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 628,601 | 462,941
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 510,738 | 376,140
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 480,183 | $ 415,245
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.1000 | 0.1000
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.0800 | 0.0800
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.0500 | 0.0500
Tri Counties Bank | Required for Capital Adequacy Purposes |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | $ 825,039 | $ 607,610
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 667,888 | 491,875
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 550,026 | 405,073
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount | $ 384,146 | $ 332,196
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 0.1050 | 0.1050
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 0.0850 | 0.0850
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio | 7.00% | 7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio | 0.0400 | 0.0400

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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