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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES- Regulatory Capital Positions (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
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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