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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES- Regulatory Capital Positions (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Holding Company [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets) | $ 2,203,045 | $ 2,118,940
Total Capital (to Risk-Weighted Assets) Ratio | 24.25% | 24.00%
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 726,759 | $ 706,418
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 8.00% | 8.00%
Common Equity Tier One Capital (to Risk-Weighted Assets) | $ 1,874,143 | $ 1,792,880
Common Equity Tier One Capital (to Risk-Weighted Assets) Ratio | 20.63% | 20.30%
Common Equity Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 408,802 | $ 397,360
Common Equity Tier One Capital (to Risk-Weighted Assets) Required for Capiral Adequacy Ratio | 4.50% | 4.50%
Tier One Capital (to Risk-Weighted Assets) | $ 1,910,247 | $ 1,828,984
Tier One Capital (to Risk-Weighted Assets) Ratio | 21.03% | 20.71%
Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 545,069 | $ 529,814
Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 6.00% | 6.00%
Leverage ratio, amount | $ 1,910,247 | $ 1,828,984
Leverage Ratio, ratio | 15.64% | 15.37%
Leverage Ratio Required For Capital Adequacy | $ 488,558 | $ 475,924
Leverage Ratio Required Fo Capital Adequacy Ratio | 4.00% | 4.00%
FirstBank [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets) | $ 2,157,718 | $ 2,075,894
Total Capital (to Risk-Weighted Assets) Ratio | 23.74% | 23.51%
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 727,167 | $ 706,426
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 8.00% | 8.00%
Total Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 908,959 | $ 883,032
Total Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 10.00% | 10.00%
Common Equity Tier One Capital (to Risk-Weighted Assets) | $ 1,735,483 | $ 1,656,563
Common Equity Tier One Capital (to Risk-Weighted Assets) Ratio | 19.09% | 18.76%
Common Equity Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 409,031 | $ 397,365
Common Equity Tier One Capital (to Risk-Weighted Assets) Required for Capiral Adequacy Ratio | 4.50% | 4.50%
Common Equity Tier One Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 590,823 | $ 573,971
Common Equity Tier One Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 6.50% | 6.50%
Tier One Capital (to Risk-Weighted Assets) | $ 2,043,485 | $ 1,964,563
Tier One Capital (to Risk-Weighted Assets) Ratio | 22.48% | 22.25%
Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy | $ 545,375 | $ 529,819
Tier One Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio | 6.00% | 6.00%
Tier One Capital (to Risk-Weighted Assets) Required To Be Well Capitalized | $ 727,167 | $ 706,426
Tier One Capital (to Risk-Weighted Assets) Required To Be Well Capitalized Ratio | 8.00% | 8.00%
Leverage ratio, amount | $ 2,043,485 | $ 1,964,563
Leverage Ratio, ratio | 16.75% | 16.53%
Leverage Ratio Required For Capital Adequacy | $ 488,108 | $ 475,490
Leverage Ratio Required Fo Capital Adequacy Ratio | 4.00% | 4.00%
Leverage Ratio Required To Be Well Capitalized | $ 610,135 | $ 594,362
Leverage Ratio Required To Be Well Capitalized Ratio | 5.00% | 5.00%

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