Regulatory Matters (Detail) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Parent
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 1,258,218	$ 1,196,106
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	1,118,292	1,052,063
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	1,060,690	994,907
Tier 1 Capital (to Average Assets), Actual, Amount	$ 1,118,292	$ 1,052,063
Total Capital (to Risk Weighted Assets), Actual, Ratio	0.1571	0.1473
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	0.1396	0.1295
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	0.1324	0.1225
Tier 1 Capital (to Average Assets), Actual, Ratio	0.1170	0.1075
Parent \| Required for Capital Adequacy Purposes
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 840,943	$ 852,850
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	680,763	690,402
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	560,628	568,566
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 382,214	$ 391,620
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	$ 1,248,802	$ 1,190,542
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	1,148,328	1,088,717
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	1,148,328	1,088,717
Tier 1 Capital (to Average Assets), Actual, Amount	$ 1,148,328	$ 1,088,717
Total Capital (to Risk Weighted Assets), Actual, Ratio	0.1560	0.1466
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	0.1434	0.1341
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	0.1434	0.1341
Tier 1 Capital (to Average Assets), Actual, Ratio	0.1202	0.1112
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 800,704	$ 812,046
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	640,563	649,637
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	520,458	527,830
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 477,620	$ 489,468
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	$ 840,740	$ 852,648
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	680,599	690,239
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	560,493	568,432
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 382,096	$ 391,574
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

Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets

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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/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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