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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Parent |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 825,099 | $ 793,433
Tier 1 Capital (to Risk Weighted Assets) | 756,668 | 727,879
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 700,660 | 671,975
Tier 1 Capital (to Average Assets) | $ 756,668 | $ 727,879
Total Capital Ratio (to Risk Weighted Assets) | 15.13% | 15.22%
Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.88% | 13.96%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 12.85% | 12.89%
Tier 1 Capital Ratio (to Average Assets) | 10.00% | 9.93%
Parent | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 572,425 | $ 547,352
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 463,392 | 443,094
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 381,617 | 364,901
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 302,730 | $ 293,138
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement | 10.50% | 10.50%
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement | 8.50% | 8.50%
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 | 4.00% | 4.00%
Tri Countries Bank |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 812,092 | $ 780,320
Tier 1 Capital (to Risk Weighted Assets) | 743,705 | 714,811
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 743,705 | 714,811
Tier 1 Capital (to Average Assets) | $ 743,705 | $ 714,811
Total Capital Ratio (to Risk Weighted Assets) | 14.90% | 14.97%
Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.65% | 13.72%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.65% | 13.72%
Tier 1 Capital Ratio (to Average Assets) | 9.84% | 9.76%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 544,980 | $ 521,101
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 435,984 | $ 416,881
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.00% | 8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 354,237 | $ 338,716
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 | $ 377,981 | $ 366,186
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 5.00% | 5.00%
Tri Countries Bank | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 572,229 | $ 547,156
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 463,233 | 442,936
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 381,486 | 364,771
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 302,385 | $ 292,949
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement | 10.50% | 10.50%
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement | 8.50% | 8.50%
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 | 4.00% | 4.00%

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