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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Parent |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Actual, Amount | $ 1,196,106 | $ 1,115,257
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 1,052,063 | 974,325
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 994,907 | 917,565
Tier 1 Capital (to Average Assets), Actual, Amount | $ 1,052,063 | $ 974,325
Total Capital (to Risk Weighted Assets), Actual, Ratio | 0.1473 | 0.1419
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1295 | 0.1240
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1225 | 0.1167
Tier 1 Capital (to Average Assets), Actual, Ratio | 0.1075 | 0.1014
Parent | Required for Capital Adequacy Purposes |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | $ 852,850 | $ 825,234
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 690,402 | 668,047
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 568,566 | 550,156
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount | $ 391,620 | $ 384,337
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 | $ 1,190,542 | $ 1,107,941
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 1,088,717 | 1,009,577
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount | 1,088,717 | 1,009,577
Tier 1 Capital (to Average Assets), Actual, Amount | $ 1,088,717 | $ 1,009,577
Total Capital (to Risk Weighted Assets), Actual, Ratio | 0.1466 | 0.1410
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1341 | 0.1285
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio | 0.1341 | 0.1285
Tier 1 Capital (to Average Assets), Actual, Ratio | 0.1112 | 0.1051
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 812,046 | $ 785,751
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 649,637 | 628,601
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 527,830 | 510,738
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 489,468 | $ 480,183
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 | $ 852,648 | $ 825,039
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 690,239 | 667,888
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount | 568,432 | 550,026
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount | $ 391,574 | $ 384,146
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 -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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