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Regulatory Matters (Detail)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Consolidated    
Schedule of Capitalization [Line Items]    
Total capital (to risk weighted assets) $ 1,240,075 $ 1,196,106
Tier 1 capital (to risk weighted assets) 1,099,766 1,052,063
Common equity Tier 1 capital (to risk weighted assets) 1,042,283 994,907
Tier 1 capital (to average assets) $ 1,099,766 $ 1,052,063
Total capital ratio (to risk weighted assets) 0.1556 0.1473
Tier 1 capital ratio (to risk weighted assets) 0.1380 0.1295
Common equity Tier 1 capital ratio (to risk weighted assets) 0.1308 0.1225
Tier 1 capital ratio (to average assets) 0.1157 0.1075
Consolidated | Basel III Fully Phased In    
Schedule of Capitalization [Line Items]    
Total capital (to risk weighted assets), minimum capital requirement $ 836,744 $ 852,850
Tier 1 capital (to risk weighted assets), minimum capital requirement 677,364 690,402
Common equity Tier 1 capital (to risk weighted assets), minimum capital requirement 557,829 568,566
Tier 1 capital (to average assets), minimum capital requirement $ 380,245 $ 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) $ 1,232,404 $ 1,190,542
Tier 1 capital (to risk weighted assets) 1,132,442 1,088,717
Common equity Tier 1 capital (to risk weighted assets) 1,132,442 1,088,717
Tier 1 capital (to average assets) $ 1,132,442 $ 1,088,717
Total capital ratio (to risk weighted assets) 0.1547 0.1466
Tier 1 capital ratio (to risk weighted assets) 0.1421 0.1341
Common equity Tier 1 capital ratio (to risk weighted assets) 0.1421 0.1341
Tier 1 capital ratio (to average assets) 0.1191 0.1112
Total capital (to risk weighted assets), minimum to be well capitalized under prompt corrective action provisions $ 796,708 $ 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 $ 637,366 $ 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 $ 517,860 $ 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 $ 475,293 $ 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 $ 836,543 $ 852,648
Tier 1 capital (to risk weighted assets), minimum capital requirement 677,202 690,239
Common equity Tier 1 capital (to risk weighted assets), minimum capital requirement 557,696 568,432
Tier 1 capital (to average assets), minimum capital requirement $ 380,234 $ 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