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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Consolidated |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 1,050,849 | $ 893,294
Tier 1 Capital (to Risk Weighted Assets) | 914,966 | 820,654
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 858,486 | 764,319
Tier 1 Capital (to Average Assets) | $ 914,966 | $ 820,654
Total Capital Ratio (to Risk Weighted Assets) | 0.1413 | 0.1542
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1230 | 0.1417
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1154 | 0.1319
Tier 1 Capital Ratio (to Average Assets) | 0.0935 | 0.0988
Consolidated | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 781,114 | $ 608,258
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 632,330 | 492,399
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 520,743 | 405,505
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 391,612 | $ 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) | $ 1,044,231 | $ 884,255
Tier 1 Capital (to Risk Weighted Assets) | 951,178 | 811,713
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 951,178 | 811,713
Tier 1 Capital (to Average Assets) | $ 951,178 | $ 811,713
Total Capital Ratio (to Risk Weighted Assets) | 0.1404 | 0.1528
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1279 | 0.1403
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1279 | 0.1403
Tier 1 Capital Ratio (to Average Assets) | 0.0972 | 0.0977
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 743,526 | $ 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 | $ 594,821 | $ 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 | $ 483,292 | $ 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 | $ 489,052 | $ 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 | $ 780,703 | $ 607,610
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 631,997 | 491,875
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 520,468 | 405,073
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 391,241 | $ 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

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