Condensed Consolidating Statement of Condition (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 376,558	$ 394,035
Money market investments	4,814,134	4,171,048
Trading account debt securities, at fair value	39,217	37,787
Debt securities available-for-sale, at fair value	13,542,695	13,300,184
Debt securities held-to-maturity, at amortized cost	99,455	101,575
Equity securities	158,507	155,584
Investment in subsidiaries	0	0
Loans held-for-sale, at lower of cost or fair value	43,985	51,422
Loans held-in-portfolio:
Loans held-in-portfolio	26,808,287	26,663,713
Less - Unearned income	160,579	155,824
Allowance for loan losses	550,628	569,348	$ 640,578	$ 623,426
Total loans held-in-portfolio, net	26,097,080	25,938,541
Premises and equipment, net	557,517	569,808
Other real estate	125,478	136,705
Accrued income receivable	162,797	166,022
Mortgage servicing assets, at fair value	167,813	169,777	166,281	168,031
Other assets	1,799,728	1,714,134
Goodwill	671,122	671,122		627,294
Other intangible assets	24,521	26,833
Total assets	48,680,607	47,604,577	45,756,761
Deposits:
Non-interest bearing	9,046,104	9,149,036
Interest bearing	31,833,734	30,561,003
Total deposits	40,879,838	39,710,039
Assets sold under agreements to repurchase	200,871	281,529
Other short-term borrowings	42	42
Notes payable	1,176,488	1,256,102
Other liabilities	983,308	921,808
Total liabilities	43,240,547	42,169,520
Stockholders' equity:
Preferred stock	50,160	50,160
Common stock	1,043	1,043
Surplus	4,313,040	4,365,606
Retained Earnings (Accumulated Deficit)	1,794,644	1,651,731
Treasury stock, at cost	(394,848)	(205,509)
Accumulated other comprehensive (loss) income, net of tax	(323,979)	(427,974)	(462,838)
Total stockholders' equity	5,440,060	5,435,057	$ 5,064,909	$ 5,103,905
Total liabilities and stockholders' equity	48,680,607	47,604,577
Elimination
Assets:
Cash and due from banks	(19,863)	(68,022)
Money market investments	(143,268)	(191,288)
Trading account debt securities, at fair value	0	0
Debt securities available-for-sale, at fair value	0	0
Debt securities held-to-maturity, at amortized cost	0	0
Equity securities	(199)	(141)
Investment in subsidiaries	(7,519,203)	(7,404,201)
Loans held-for-sale, at lower of cost or fair value	0	0
Loans held-in-portfolio:
Loans held-in-portfolio	5,955	5,955
Less - Unearned income	0	0
Allowance for loan losses	0	0
Total loans held-in-portfolio, net	5,955	5,955
Premises and equipment, net	0	0
Other real estate	0	0
Accrued income receivable	(46)	(145)
Mortgage servicing assets, at fair value	0	0
Other assets	(21,907)	(15,697)
Goodwill	(1)	(1)
Other intangible assets	0	0
Total assets	(7,698,532)	(7,673,540)
Deposits:
Non-interest bearing	(19,863)	(68,022)
Interest bearing	(143,268)	(191,288)
Total deposits	(163,131)	(259,310)
Assets sold under agreements to repurchase	0	0
Other short-term borrowings	0	0
Notes payable	0	0
Other liabilities	(22,510)	(16,011)
Total liabilities	(185,641)	(275,321)
Stockholders' equity:
Preferred stock	0	0
Common stock	(56,309)	(56,309)
Surplus	(9,955,103)	(9,954,780)
Retained Earnings (Accumulated Deficit)	2,151,640	2,143,263
Treasury stock, at cost	(133)	(88)
Accumulated other comprehensive (loss) income, net of tax	347,014	469,695
Total stockholders' equity	(7,512,891)	(7,398,219)
Total liabilities and stockholders' equity	(7,698,532)	(7,673,540)
Popular, Inc. Holding Co.
Assets:
Cash and due from banks	19,856	68,022
Money market investments	131,476	176,256
Trading account debt securities, at fair value	0	0
Debt securities available-for-sale, at fair value	0	0
Debt securities held-to-maturity, at amortized cost	8,726	8,726
Equity securities	9,067	6,693
Investment in subsidiaries	5,784,052	5,704,119
Loans held-for-sale, at lower of cost or fair value	0	0
Loans held-in-portfolio:
Loans held-in-portfolio	32,427	32,678
Less - Unearned income	0	0
Allowance for loan losses	261	155
Total loans held-in-portfolio, net	32,166	32,523
Premises and equipment, net	3,394	3,394
Other real estate	146	146
Accrued income receivable	384	284
Mortgage servicing assets, at fair value	0	0
Other assets	87,304	76,073
Goodwill	0	0
Other intangible assets	6,536	6,559
Total assets	6,083,107	6,082,795
Deposits:
Non-interest bearing	0	0
Interest bearing	0	0
Total deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings	0	0
Notes payable	585,168	584,851
Other liabilities	57,746	62,799
Total liabilities	642,914	647,650
Stockholders' equity:
Preferred stock	50,160	50,160
Common stock	1,043	1,043
Surplus	4,304,512	4,357,079
Retained Earnings (Accumulated Deficit)	1,803,172	1,660,258
Treasury stock, at cost	(394,715)	(205,421)
Accumulated other comprehensive (loss) income, net of tax	(323,979)	(427,974)
Total stockholders' equity	5,440,193	5,435,145
Total liabilities and stockholders' equity	6,083,107	6,082,795
PNA Holding Co.
Assets:
Cash and due from banks	0	0
Money market investments	12,268	15,288
Trading account debt securities, at fair value	0	0
Debt securities available-for-sale, at fair value	0	0
Debt securities held-to-maturity, at amortized cost	2,835	2,835
Equity securities	20	20
Investment in subsidiaries	1,735,151	1,700,082
Loans held-for-sale, at lower of cost or fair value	0	0
Loans held-in-portfolio:
Loans held-in-portfolio	0	0
Less - Unearned income	0	0
Allowance for loan losses	0	0
Total loans held-in-portfolio, net	0	0
Premises and equipment, net	0	0
Other real estate	0	0
Accrued income receivable	18	116
Mortgage servicing assets, at fair value	0	0
Other assets	26,928	27,639
Goodwill	0	0
Other intangible assets	0	0
Total assets	1,777,220	1,745,980
Deposits:
Non-interest bearing	0	0
Interest bearing	0	0
Total deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings	0	0
Notes payable	94,070	94,063
Other liabilities	1,639	3,287
Total liabilities	95,709	97,350
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Surplus	4,173,021	4,172,983
Retained Earnings (Accumulated Deficit)	(2,464,720)	(2,479,503)
Treasury stock, at cost	0	0
Accumulated other comprehensive (loss) income, net of tax	(26,792)	(44,852)
Total stockholders' equity	1,681,511	1,648,630
Total liabilities and stockholders' equity	1,777,220	1,745,980
All other subsidiaries and eliminations
Assets:
Cash and due from banks	376,565	394,035
Money market investments	4,813,658	4,170,792
Trading account debt securities, at fair value	39,217	37,787
Debt securities available-for-sale, at fair value	13,542,695	13,300,184
Debt securities held-to-maturity, at amortized cost	87,894	90,014
Equity securities	149,619	149,012
Investment in subsidiaries	0	0
Loans held-for-sale, at lower of cost or fair value	43,985	51,422
Loans held-in-portfolio:
Loans held-in-portfolio	26,769,905	26,625,080
Less - Unearned income	160,579	155,824
Allowance for loan losses	550,367	569,193
Total loans held-in-portfolio, net	26,058,959	25,900,063
Premises and equipment, net	554,123	566,414
Other real estate	125,332	136,559
Accrued income receivable	162,441	165,767
Mortgage servicing assets, at fair value	167,813	169,777
Other assets	1,707,403	1,626,119
Goodwill	671,123	671,123
Other intangible assets	17,985	20,274
Total assets	48,518,812	47,449,342
Deposits:
Non-interest bearing	9,065,967	9,217,058
Interest bearing	31,977,002	30,752,291
Total deposits	41,042,969	39,969,349
Assets sold under agreements to repurchase	200,871	281,529
Other short-term borrowings	42	42
Notes payable	497,250	577,188
Other liabilities	946,433	871,733
Total liabilities	42,687,565	41,699,841
Stockholders' equity:
Preferred stock	0	0
Common stock	56,307	56,307
Surplus	5,790,610	5,790,324
Retained Earnings (Accumulated Deficit)	304,552	327,713
Treasury stock, at cost	0	0
Accumulated other comprehensive (loss) income, net of tax	(320,222)	(424,843)
Total stockholders' equity	5,831,247	5,749,501
Total liabilities and stockholders' equity	$ 48,518,812	$ 47,449,342