Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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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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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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