Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Consolidated
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets)	$ 1,041,638	$ 893,294
Tier 1 Capital (to Risk Weighted Assets)	911,624	820,654
Common Equity Tier 1 Capital (to Risk Weighted Assets)	855,180	764,319
Tier 1 Capital (to Average Assets)	$ 911,624	$ 820,654
Total Capital Ratio (to Risk Weighted Assets)	0.1496	0.1542
Tier 1 Capital Ratio (to Risk Weighted Assets)	0.1309	0.1417
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets)	0.1228	0.1319
Tier 1 Capital Ratio (to Average Assets)	0.1080	0.0988
Consolidated \| Basel III Fully Phased In
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement	$ 731,146	$ 608,258
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	591,880	492,399
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	487,431	405,505
Tier 1 Capital (to Average Assets), Minimum Capital Requirement	$ 337,680	$ 332,205
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	0.1050	0.1050
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	0.0850	0.0850
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	7.00%	7.00%
Tier 1 Capital Ratio (to Average Assets), Minimum Capital Requirement	0.0400	0.0400
Tri Counties Bank
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets)	$ 1,031,120	$ 884,255
Tier 1 Capital (to Risk Weighted Assets)	943,960	811,713
Common Equity Tier 1 Capital (to Risk Weighted Assets)	943,960	811,713
Tier 1 Capital (to Average Assets)	$ 943,960	$ 811,713
Total Capital Ratio (to Risk Weighted Assets)	0.1481	0.1528
Tier 1 Capital Ratio (to Risk Weighted Assets)	0.1356	0.1403
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets)	0.1356	0.1403
Tier 1 Capital Ratio (to Average Assets)	0.1118	0.0977
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 696,000	$ 578,676
Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 556,800	$ 462,941
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.0800	0.0800
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 452,300	$ 376,140
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 422,043	$ 415,245
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	0.0500	0.0500
Tri Counties Bank \| Basel III Fully Phased In
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement	$ 730,800	$ 607,610
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	591,600	491,875
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	487,200	405,073
Tier 1 Capital (to Average Assets), Minimum Capital Requirement	$ 337,635	$ 332,196
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	0.1050	0.1050
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	0.0850	0.0850
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	7.00%	7.00%
Tier 1 Capital Ratio (to Average Assets), Minimum Capital Requirement	0.0400	0.0400

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

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