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Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Parent |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets) | $ 774,095 | $ 753,200
Tier 1 Capital (to Risk Weighted Assets) | 710,195 | 719,809
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 654,396 | 664,296
Tier 1 Capital (to Average Assets) | $ 710,195 | $ 719,809
Total Capital Ratio (to Risk Weighted Assets) | 15.23% | 15.07%
Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.97% | 14.40%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 12.87% | 13.29%
Tier 1 Capital Ratio (to Average Assets) | 9.95% | 11.55%
Parent | Basel III Fully Phased In |  |
Schedule of Capitalization [Line Items] |  |
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement | $ 533,776 | $ 524,944
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 432,104 | 424,955
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 355,850 | 349,963
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 285,482 | $ 249,343
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) | $ 769,528 | $ 748,660
Tier 1 Capital (to Risk Weighted Assets) | 705,673 | 715,269
Common Equity Tier 1 Capital (to Risk Weighted Assets) | 705,673 | 715,269
Tier 1 Capital (to Average Assets) | $ 705,673 | $ 715,269
Total Capital Ratio (to Risk Weighted Assets) | 15.14% | 14.98%
Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.89% | 14.31%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets) | 13.89% | 14.31%
Tier 1 Capital Ratio (to Average Assets) | 9.89% | 11.47%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 508,166 | $ 499,770
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 | $ 406,533 | $ 399,816
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 | $ 330,308 | $ 324,851
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 | $ 356,845 | $ 311,672
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 | $ 533,575 | $ 524,759
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 431,941 | 424,805
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement | 355,716 | 349,839
Tier 1 Capital (to Average Assets), Minimum Capital Requirement | $ 285,476 | $ 249,337
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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