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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Consolidated |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 1,212,626 | $ 1,196,106
Tier 1 Capital (to Risk Weighted Assets) | 1,068,911 | 1,052,063
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 1,011,649 | 994,907
Tier 1 Capital (to Average Assets) | $ 1,068,911 | $ 1,052,063
Total Capital Ratio (to Risk Weighted Assets) | 0.1497 | 0.1473
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1320 | 0.1295
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1249 | 0.1225
Tier 1 Capital Ratio (to Average Assets) | 0.1101 | 0.1075
Consolidated | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 850,469 | $ 852,850
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 688,475 | 690,402
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 566,979 | 568,566
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 388,326 | $ 391,620
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) | $ 1,202,415 | $ 1,190,542
Tier 1 Capital (to Risk Weighted Assets) | 1,100,831 | 1,088,717
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 1,100,831 | 1,088,717
Tier 1 Capital (to Average Assets) | $ 1,100,831 | $ 1,088,717
Total Capital Ratio (to Risk Weighted Assets) | 0.1485 | 0.1466
Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1359 | 0.1341
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 0.1359 | 0.1341
Tier 1 Capital Ratio (to Average Assets) | 0.1134 | 0.1112
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 809,776 | $ 812,046
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 | $ 647,821 | $ 649,637
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 | $ 526,355 | $ 527,830
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 | $ 485,316 | $ 489,468
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 | $ 850,265 | $ 852,648
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 688,310 | 690,239
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 566,843 | 568,432
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 388,253 | $ 391,574
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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