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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Consolidated |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 1,152,530 | $ 1,115,257
Tier 1 Capital (to Risk Weighted Assets) | 1,010,295 | 974,325
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 953,407 | 917,565
Tier 1 Capital (to Average Assets) | $ 1,010,295 | $ 974,325
Total Capital Ratio (to Risk Weighted Assets) | 0.1447 | 0.1419
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1269 | 0.1240
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1197 | 0.1167
Tier 1 Capital Ratio (to Average Assets) | 0.1041 | 0.1014
Consolidated | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 836,038 | $ 825,234
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 676,793 | 668,047
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 557,359 | 550,156
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 388,260 | $ 384,337
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) | $ 1,147,002 | $ 1,107,941
Tier 1 Capital (to Risk Weighted Assets) | 1,047,217 | 1,009,577
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 1,047,217 | 1,009,577
Tier 1 Capital (to Average Assets) | $ 1,047,217 | $ 1,009,577
Total Capital Ratio (to Risk Weighted Assets) | 0.1441 | 0.1410
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1316 | 0.1285
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1316 | 0.1285
Tier 1 Capital Ratio (to Average Assets) | 0.1079 | 0.1051
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 796,041 | $ 785,751
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 | $ 636,833 | $ 628,601
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 | $ 517,427 | $ 510,738
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 | $ 485,271 | $ 480,183
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 | $ 835,843 | $ 825,039
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 676,635 | 667,888
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 557,229 | 550,026
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 388,217 | $ 384,146
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

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