Customers Bancorp (CUBI) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2020
Entity File Number	001-35542
Entity Registrant Name	Customers Bancorp, Inc.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	27-2290659
Entity Address, Address Line One	701 Reading Avenue
Entity Address, City or Town	West Reading
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19611
City Area Code	610
Local Phone Number	933-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		31,601,311
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001488813
Current Fiscal Year End Date	--12-31
Voting Common Stock, par value $1.00 per share | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Voting Common Stock, par value $1.00 per share
Trading Symbol	CUBI
Security Exchange Name	NYSE
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series C, par value $1.00 per share
Trading Symbol	CUBI/PC
Security Exchange Name	NYSE
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series D, par value $1.00 per share
Trading Symbol	CUBI/PD
Security Exchange Name	NYSE
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series E, par value $1.00 per share
Trading Symbol	CUBI/PE
Security Exchange Name	NYSE
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series F, par value $1.00 per share
Trading Symbol	CUBI/PF
Security Exchange Name	NYSE
5.375% Subordinated Notes due 2034 | New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	5.375% Subordinated Notes due 2034
Trading Symbol	CUBB
Security Exchange Name	NYSE

Consolidated Balance Sheet - Un

Consolidated Balance Sheet - Unaudited - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 5,822	$ 33,095
Interest earning deposits	325,594	179,410
Cash and cash equivalents	331,416	212,505
Investment securities, at fair value	1,133,831	595,876
Loans held for sale (includes $6,998 and $2,130, respectively, at fair value)	26,689	486,328
Loans receivable, mortgage warehouse, at fair value	3,913,593	2,245,758
Loans receivable, PPP	4,964,105	0
Loans and leases receivable	7,700,892	7,318,988
Allowance for credit losses on loans and leases	(155,561)	(56,379)
Total loans and leases receivable, net of allowance for credit losses	16,423,029	9,508,367
FHLB, Federal Reserve Bank, and other restricted stock	70,387	84,214
Accrued interest receivable	65,668	38,072
Bank premises and equipment, net	11,744	9,389
Bank-owned life insurance	277,826	272,546
Other real estate owned	131	173
Goodwill and other intangibles	14,437	15,195
Other assets	423,569	298,052
Total assets	18,778,727	11,520,717
Deposits:
Demand, non-interest bearing	2,327,017	1,343,391
Interest bearing	8,512,060	7,305,545
Total deposits	10,839,077	8,648,936
FRB advances	4,811,009
Federal funds purchased	680,000	538,000
FHLB advances	850,000	850,000
Other borrowings	123,935	123,630
Subordinated debt	181,324	181,115
FRB PPP liquidity facility	4,811,009	0
Accrued interest payable and other liabilities	241,891	126,241
Total liabilities	17,727,236	10,467,922
Commitments and contingencies (NOTE 15)
Shareholders’ equity:
Preferred stock, par value $1.00 per share; liquidation preference $25.00 per share; 100,000,000 shares authorized, 9,000,000 shares issued and outstanding as of September 30, 2020 and December 31, 2019	217,471	217,471
Common stock, par value $1.00 per share; 200,000,000 shares authorized; 32,835,743 and 32,617,410 shares issued as of September 30, 2020 and December 31, 2019; 31,555,124 and 31,336,791 shares outstanding as of September 30, 2020 and December 31, 2019	32,836	32,617
Additional paid in capital	452,965	444,218
Retained earnings	385,750	381,519
Accumulated other comprehensive loss, net	(15,751)	(1,250)
Treasury stock, at cost (1,280,619 shares as of September 30, 2020 and December 31, 2019)	(21,780)	(21,780)
Total shareholders’ equity	1,051,491	1,052,795
Total liabilities and shareholders’ equity	$ 18,778,727	$ 11,520,717

Consolidated Balance Sheet - _2

Consolidated Balance Sheet - Unaudited (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Loans held for sale at fair value	$ 6,998	$ 2,130
Preferred stock, par value (usd per share)	$ 1	$ 1
Preferred stock, liquidation preference (usd per share)	$ 25	$ 25
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, shares issued (shares)	9,000,000	9,000,000
Preferred stock, shares outstanding (shares)	9,000,000	9,000,000
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock, shares issued (shares)	32,835,743	32,617,410
Common stock, shares outstanding (shares)	31,555,124	31,336,791
Treasury stock, shares (shares)	1,280,619	1,280,619

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - Unaudited - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Loans and leases	$ 132,107	$ 118,444	$ 366,634	$ 315,126
Investment securities	6,297	5,867	17,429	18,589
Other	1,246	2,407	6,149	6,030
Total interest income	139,650	126,718	390,212	339,745
Interest expense:
Deposits	18,347	38,267	75,939	105,472
FHLB advances	5,762	7,563	15,889	20,463
Subordinated debt	2,689	1,684	8,066	5,053
FRB PPP liquidity facility, federal funds purchased and other borrowings	5,413	3,469	9,576	9,039
Total interest expense	32,211	50,983	109,470	140,027
Net interest income	107,439	75,735	280,742	199,718
Provision for credit losses on loans and leases	12,955	4,426	65,688	14,539
Net interest income after provision for credit losses on loans and leases	94,484	71,309	215,054	185,179
Non-interest income:
Non-interest income	8,869	11,779	31,617	35,370
Commercial lease income	4,510	3,080	13,286	8,212
Bank-owned life insurance	1,746	1,824	5,265	5,477
Mortgage warehouse transactional fees	3,320	2,150	7,854	5,145
Gain (loss) on sale of SBA and other loans	286	0	320	0
Mortgage banking income	1,013	283	1,347	701
Loss upon acquisition of interest-only GNMA securities	0	0	0	(7,476)
Gain (loss) on sale of investment securities	11,707	1,001	20,035	1,001
Unrealized gain (loss) on investment securities	238	1,333	60	988
Other	3,453	3,187	2,203	9,443
Total non-interest income	33,793	23,369	77,959	55,125
Non-interest expense:
Salaries and employee benefits	32,676	27,193	92,283	79,936
Technology, communication and bank operations	13,215	8,755	39,576	33,110
Professional services	7,253	8,348	19,476	18,639
Occupancy	3,632	3,661	9,689	9,628
Commercial lease depreciation	3,663	2,459	10,733	6,633
FDIC assessments, non-income taxes, and regulatory fees	3,784	(777)	9,019	3,368
Provision for operating losses	1,186	3,998	3,166	8,223
Advertising and promotion	0	976	2,221	3,145
Merger and acquisition related expenses	1,035	0	1,110	0
Loan workout	846	495	3,020	1,458
Other real estate owned	7	108	26	151
Other	(1,736)	4,376	5,206	8,869
Total non-interest expense	65,561	59,592	195,525	173,160
Income before income tax expense	62,716	35,086	97,488	67,144
Income tax expense	12,201	8,020	21,156	15,343
Net income	50,515	27,066	76,332	51,801
Preferred stock dividends	3,430	3,615	10,626	10,844
Net income (loss) available to common shareholders	$ 47,085	$ 23,451	$ 65,706	$ 40,957
Basic earnings (loss) per common share (usd per share)	$ 1.49	$ 0.75	$ 2.09	$ 1.32
Diluted earnings (loss) per common share (usd per share)	$ 1.48	$ 0.74	$ 2.07	$ 1.30
Interchange and card revenue
Non-interest income:
Non-interest income	$ 4,081	$ 6,869	$ 17,368	$ 22,435
Deposit fees
Non-interest income:
Non-interest income	$ 3,439	$ 3,642	$ 10,221	$ 9,199

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - Unaudited - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 50,515	$ 27,066	$ 76,332	$ 51,801
Unrealized gains (losses) on available for sale debt securities:
Unrealized gains (losses) arising during the period	(1,090)	7,858	25,127	46,430
Income tax effect	283	(2,043)	(6,533)	(12,072)
Reclassification adjustments for (gains) losses included in net income	(11,707)	(1,001)	(20,035)	(1,001)
Income tax effect	3,044	260	5,209	260
Net unrealized gains (losses) on available for sale debt securities	(9,470)	5,074	3,768	33,617
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	580	(5,163)	(33,486)	(26,204)
Income tax effect	(151)	1,342	8,884	6,813
Reclassification adjustment for (gains) losses included in net income	4,400	764	8,596	355
Income tax effect	(1,145)	(198)	(2,263)	(92)
Net unrealized gains (losses) on cash flow hedges	3,684	(3,255)	(18,269)	(19,128)
Other comprehensive income (loss), net of income tax effect	(5,786)	1,819	(14,501)	14,489
Comprehensive income (loss)	$ 44,729	$ 28,885	$ 61,831	$ 66,290

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - Unaudited - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance, preferred stock (shares) at Dec. 31, 2018				9,000,000
Beginning balance, common stock (shares) at Dec. 31, 2018					31,003,028
Beginning balance at Dec. 31, 2018		$ 956,816		$ 217,471	$ 32,252	$ 434,314	$ 316,651		$ (22,663)	$ (21,209)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		51,801					51,801
Other comprehensive income (loss)		14,489							14,489
Preferred stock dividends	[1]	(10,844)					(10,844)
Share-based compensation expense		6,557				6,557
Issuance of common stock under share-based compensation arrangements (shares)					273,907
Issuance of common stock under share-based compensation arrangements		902			$ 274	628
Repurchase of common shares (shares)					(31,159)
Repurchase of common shares		(571)								(571)
Ending balance, preferred stock (shares) at Sep. 30, 2019				9,000,000
Ending balance, common stock (shares) at Sep. 30, 2019					31,245,776
Ending balance at Sep. 30, 2019		$ 1,019,150		$ 217,471	$ 32,526	441,499	357,608		(8,174)	(21,780)
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Beginning balance, preferred stock (shares) at Dec. 31, 2018				9,000,000
Beginning balance, common stock (shares) at Dec. 31, 2018					31,003,028
Beginning balance at Dec. 31, 2018		$ 956,816		$ 217,471	$ 32,252	434,314	316,651		(22,663)	(21,209)
Ending balance, preferred stock (shares) at Dec. 31, 2019		9,000,000		9,000,000
Ending balance, common stock (shares) at Dec. 31, 2019		31,336,791			31,336,791
Ending balance at Dec. 31, 2019		$ 1,052,795	$ (61,475)	$ 217,471	$ 32,617	444,218	381,519	$ (61,475)	(1,250)	(21,780)
Beginning balance, preferred stock (shares) at Jun. 30, 2019				9,000,000
Beginning balance, common stock (shares) at Jun. 30, 2019					31,202,023
Beginning balance at Jun. 30, 2019		991,405		$ 217,471	$ 32,483	439,067	334,157		(9,993)	(21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		27,066					27,066
Other comprehensive income (loss)		1,819							1,819
Preferred stock dividends	[2]	(3,615)					(3,615)
Share-based compensation expense		2,133				2,133
Issuance of common stock under share-based compensation arrangements (shares)					43,753
Issuance of common stock under share-based compensation arrangements		342			$ 43	299
Ending balance, preferred stock (shares) at Sep. 30, 2019				9,000,000
Ending balance, common stock (shares) at Sep. 30, 2019					31,245,776
Ending balance at Sep. 30, 2019		$ 1,019,150		$ 217,471	$ 32,526	441,499	357,608		(8,174)	(21,780)
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Beginning balance, preferred stock (shares) at Dec. 31, 2019		9,000,000		9,000,000
Beginning balance, common stock (shares) at Dec. 31, 2019		31,336,791			31,336,791
Beginning balance at Dec. 31, 2019		$ 1,052,795	$ (61,475)	$ 217,471	$ 32,617	444,218	381,519	$ (61,475)	(1,250)	(21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		76,332					76,332
Other comprehensive income (loss)		(14,501)							(14,501)
Preferred stock dividends	[1]	(10,626)					(10,626)
Share-based compensation expense		8,855				8,855
Issuance of common stock under share-based compensation arrangements (shares)					218,333
Issuance of common stock under share-based compensation arrangements		$ 111			$ 219	(108)
Ending balance, preferred stock (shares) at Sep. 30, 2020		9,000,000		9,000,000
Ending balance, common stock (shares) at Sep. 30, 2020		31,555,124			31,555,124
Ending balance at Sep. 30, 2020		$ 1,051,491		$ 217,471	$ 32,836	452,965	385,750		(15,751)	(21,780)
Beginning balance, preferred stock (shares) at Jun. 30, 2020				9,000,000
Beginning balance, common stock (shares) at Jun. 30, 2020					31,510,287
Beginning balance at Jun. 30, 2020		1,007,847		$ 217,471	$ 32,791	450,665	338,665		(9,965)	(21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		50,515					50,515
Other comprehensive income (loss)		(5,786)							(5,786)
Preferred stock dividends	[2]	(3,430)					(3,430)
Share-based compensation expense		2,028				2,028
Issuance of common stock under share-based compensation arrangements (shares)					44,837
Issuance of common stock under share-based compensation arrangements		$ 317			$ 45	272
Ending balance, preferred stock (shares) at Sep. 30, 2020		9,000,000		9,000,000
Ending balance, common stock (shares) at Sep. 30, 2020		31,555,124			31,555,124
Ending balance at Sep. 30, 2020		$ 1,051,491		$ 217,471	$ 32,836	$ 452,965	$ 385,750		$ (15,751)	$ (21,780)
[1]	Dividends per share of $1.232778, $1.21875, $1.209375, and $1.125 per share were declared on Series C, D, E, and F preferred stock for the nine months ended September 30, 2020. Dividends per share of $1.3125, $1.21875, $1.209375, and $1.125 per share were declared on Series C, D, E, and F preferred stock for the nine months ended September 30, 2019.
[2]	Dividends per share of $0.357778, $0.40625, $0.403125, and $0.375 per share were declared on Series C, D, E, and F preferred stock for the three months ended September 30, 2020. Dividends per share of $0.4375, $0.40625, $0.403125, and $0.375 per share were declared on Series C, D, E, and F preferred stock for the three months ended September 30, 2019.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities
Net income	$ 76,332	$ 51,801
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses on loans and leases	65,688	14,539
Depreciation and amortization	22,557	15,167
Share-based compensation expense	9,474	7,289
Deferred taxes	(26,188)	8,701
Net amortization (accretion) of investment securities premiums and discounts	(449)	691
Unrealized (gain) loss on investment securities	(60)	(988)
(Gain) loss on sale of investment securities	(20,035)	(1,001)
Loss upon acquisition of interest-only GNMA securities	0	7,476
(Gain) loss on sale of SBA and other loans	194	(602)
Origination of loans held for sale	(50,941)	(35,760)
Proceeds from the sale of loans held for sale	47,009	36,115
Amortization (accretion) of fair value discounts and premiums	(2,106)	561
Net (gain) loss on sales of other real estate owned	(4)	137
Valuation and other adjustments to other real estate owned	0	31
Earnings on investment in bank-owned life insurance	(5,265)	(5,477)
(Increase) decrease in accrued interest receivable and other assets	(124,378)	(79,299)
Increase (decrease) in accrued interest payable and other liabilities	81,640	15,302
Net Cash Provided By Operating Activities	73,468	34,683
Cash Flows from Investing Activities
Proceeds from maturities, calls and principal repayments of investment securities	156,759	22,627
Proceeds from sales of investment securities available for sale	377,767	97,555
Purchases of investment securities available for sale	(1,024,345)	0
Origination of mortgage warehouse loans	(41,764,787)	(22,167,517)
Proceeds from repayments of mortgage warehouse loans	40,106,032	21,049,044
Net (increase) decrease in loans and leases, excluding mortgage warehouse loans	(4,733,097)	(6,808)
Proceeds from sales of loans and leases	23,390	0
Purchase of loans	(226,498)	(636,366)
Net proceeds from sale of (purchases of) FHLB, Federal Reserve Bank, and other restricted stock	13,827	7,832
Purchases of bank premises and equipment	(4,231)	(5,397)
Proceeds from sales of other real estate owned	77	735
Purchases of leased assets under lessor operating leases	(11,432)	(27,239)
Net Cash Used In Investing Activities	(7,086,538)	(1,665,534)
Cash Flows from Financing Activities
Net increase in deposits	2,190,141	1,783,449
Net increase (decrease) in short-term borrowed funds from the FHLB	0	(557,270)
Net increase (decrease) in federal funds purchased	142,000	186,000
Net increase (decrease) in borrowed funds from PPP liquidity facility	4,811,009	0
Proceeds from long-term borrowed funds from the FHLB	0	350,000
Proceeds from issuance of subordinated long-term debt	0	25,000
Repayments of other borrowings	0	(25,000)
Preferred stock dividends paid	(10,661)	(10,844)
Purchase of treasury stock	0	(571)
Payments of employee taxes withheld from share-based awards	(1,143)	(1,366)
Proceeds from issuance of common stock	635	1,536
Net Cash Provided By Financing Activities	7,131,981	1,750,934
Net Increase (Decrease) in Cash and Cash Equivalents	118,911	120,083
Cash and Cash Equivalents – Beginning	212,505	62,135
Cash and Cash Equivalents – Ending	331,416	182,218
Non-cash Operating and Investing Activities:
Transfer of loans to other real estate owned	31	291
Transfer of loans held for investment to held for sale	18,336	499,774
Unsettled purchases of investment securities	22,500	0
Transfer of multi-family loans held for sale to held for investment	401,144	0
Acquisition of interest-only GNMA securities securing a mortgage warehouse loan	0	17,157
Acquisition of residential reverse mortgage loans securing a mortgage warehouse loan	$ 0	$ 1,325

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity - Unaudited (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Series C Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	$ 0.357778	$ 0.4375	$ 1.232778	$ 1.3125
Series D Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	0.40625	0.40625	1.21875	1.21875
Series E Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	0.403125	0.403125	1.209375	1.209375
Series F Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	$ 0.375	$ 0.375	$ 1.125	$ 1.125

Description of the Business

Description of the Business	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	DESCRIPTION OF THE BUSINESS Customers Bancorp, Inc. (“Customers Bancorp”) is a bank holding company engaged in banking activities through its wholly owned subsidiary, Customers Bank ("the Bank”), collectively referred to as “Customers” herein. Customers Bancorp and its wholly owned subsidiaries, the Bank, and non-bank subsidiaries, serve residents and businesses in Southeastern Pennsylvania (Bucks, Berks, Chester, Philadelphia and Delaware Counties); Rye Brook, New York (Westchester County); Hamilton, New Jersey (Mercer County); Boston, Massachusetts; Providence, Rhode Island; Portsmouth, New Hampshire (Rockingham County); Manhattan and Melville, New York; Washington, D.C.; Chicago, Illinois; and nationally for certain loan and deposit products. The Bank has 13 full-service branches and provides commercial banking products, primarily loans and deposits. In addition, Customers Bank also administratively supports loan and other financial products, including equipment finance leases, to customers through its limited-purpose offices in Boston, Massachusetts; Providence, Rhode Island; Portsmouth, New Hampshire; Manhattan and Melville, New York; Philadelphia, Pennsylvania; Washington, D.C.; and Chicago, Illinois. The Bank also serves specialty niche businesses nationwide, including its commercial loans to mortgage banking businesses, commercial equipment financing, SBA lending, specialty lending and consumer loans through relationships with fintech companies. In addition, BankMobile, a division of Customers Bank, offers state-of-the-art high-tech digital banking services to consumers, students and the "under banked" nationwide, along with "Banking as a Service" offerings with white label partners. The Bank is subject to regulation of the Pennsylvania Department of Banking and Securities and the Federal Reserve Bank and is periodically examined by those regulatory authorities. Customers Bancorp has made certain equity investments through its wholly owned subsidiaries CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd.

Significant Accounting Policies

Significant Accounting Policies and Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Significant Accounting Policies and Basis of Presentation	SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION Basis of Presentation The interim unaudited consolidated financial statements have been prepared in conformity with U.S. GAAP and pursuant to the rules and regulations of the SEC. These interim unaudited consolidated financial statements reflect all normal and recurring adjustments that are, in the opinion of management, necessary to present a fair statement of the financial position and the results of operations and cash flows of Customers Bancorp and subsidiaries for the interim periods presented. Certain information and footnote disclosures normally included in the annual consolidated financial statements have been omitted from these interim unaudited consolidated financial statements as permitted by SEC rules and regulations. The December 31, 2019 consolidated balance sheet presented in this report has been derived from Customers Bancorp’s audited 2019 consolidated financial statements. Management believes that the disclosures are adequate to present fairly the consolidated financial statements as of the dates and for the periods presented. These interim unaudited consolidated financial statements should be read in conjunction with the 2019 consolidated financial statements of Customers Bancorp and subsidiaries included in Customers' Annual Report on Form 10-K for the year ended December 31, 2019 filed with the SEC on March 2, 2020 (the "2019 Form 10-K"). The 2019 Form 10-K describes Customers Bancorp’s significant accounting policies, which include its policies on Principles of Consolidation; Cash and Cash Equivalents and Statements of Cash Flows; Restrictions on Cash and Amounts due from Banks; Business Combinations; Investment Securities; Loan Accounting Framework; Loans Held for Sale and Loans at Fair Value; Loans Receivable - Mortgage Warehouse, at Fair Value; Loans and Leases Receivable; Purchased Loans; ALLL; Goodwill and Other Intangible Assets; FHLB, Federal Reserve Bank, and Other Restricted Stock; OREO; BOLI; Bank Premises and Equipment; Lessor Operating Leases; Treasury Stock; Income Taxes; Share-Based Compensation; Transfer of Financial Assets; Segment Information; Derivative Instruments and Hedging; Comprehensive Income (Loss); EPS; Loss Contingencies; and Collaborative Arrangements. There have been no material changes to Customers Bancorp's significant accounting policies noted above for the three and nine months ended September 30, 2020, except for the adoption of ASU 2016-13 Financial Instruments - Credit Losses ("ASC 326"): Measurement of Credit Losses on Financial Instruments, which is discussed below in Adoption of New Accounting Standard, and replaces our prior ALLL policy. New Accounting Standards Presented below are recently issued accounting standards that Customers has adopted as well as those that the FASB has issued but are not yet effective. Accounting Standards Adopted in 2020 Allowance for Credit Losses On January 1, 2020, Customers adopted ASC 326, which replaced the incurred loss methodology with an expected loss methodology that is referred to as the CECL methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and net investments in leases recognized by Customers as a lessor in accordance with ASC 842. CECL also applies to off-balance sheet credit exposures not accounted for as insurance, such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments. ASC 326 also made changes to the accounting for AFS debt securities, which now requires credit losses to be presented as an allowance, rather than as a write-down on AFS debt securities that management does not intend to sell or believes that it is more likely than not they will not be required to sell. Customers adopted ASC 326 using the modified retrospective method for all financial assets measured at amortized cost, net investments in leases, and off-balance sheet credit exposures. Results for reporting periods beginning after December 31, 2019 are presented under ASC 326, while prior period amounts continue to be reported in accordance with previously applicable GAAP. Customers recorded a net decrease to retained earnings of $61.5 million, net of deferred taxes of $21.5 million, as of January 1, 2020 for the cumulative effect of adopting ASC 326. Customers adopted ASC 326 The following table illustrates the impact of adopting ASC 326: (amounts in thousands) Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported Under Assets Loans receivable, mortgage warehouse, at fair value $ 2,245,758 $ — $ 2,245,758 Loans and leases receivable Multi-family 1,907,331 7 1,907,338 Commercial and industrial 1,891,152 3 1,891,155 Commercial real estate owner occupied 551,948 100 552,048 Commercial real estate non-owner occupied 1,222,772 41 1,222,813 Construction 117,617 — 117,617 Total commercial loans and leases receivable 5,690,820 151 5,690,971 Residential real estate 382,634 32 382,666 Manufactured housing 71,359 37 71,396 Installment 1,174,175 12 1,174,187 Total consumer loans receivable 1,628,168 81 1,628,249 Loans and leases receivable 7,318,988 232 7,319,220 Allowance for credit losses on loans and leases (56,379) (79,829) (136,208) Total loans and leases receivable, net of allowance for credit losses on loans and leases 9,508,367 (79,596) 9,428,771 Liabilities Allowance for credit losses on lending-related commitments 49 3,388 3,437 Net deferred tax (asset) liability 11,740 (21,510) (9,770) Equity Retained earnings $ 381,519 $ (61,475) $ 320,044 Allowance for Credit Losses on Loans and Leases The allowance for credit losses on loans and leases is a valuation account that is deducted from the loan or lease’s amortized cost basis to present the net amount expected to be collected on the loans and leases. Loans and leases deemed to be uncollectible are charged against the allowance for credit losses on loans and leases, and subsequent recoveries, if any, are credited to the allowance for credit losses on loans and leases. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Changes to the allowance for credit losses on loans and leases are recorded through the provision for credit losses on loans and leases. The allowance for credit losses on loans and leases is maintained at a level considered appropriate to absorb expected credit losses over the expected life of the portfolio as of the reporting date. The allowance for credit losses on loans and leases is measured on a collective (pool) basis when similar risk characteristics exist. Customers' loan portfolio segments include commercial and consumer. Each of these two loan portfolio segments is comprised of multiple loan classes. Loan classes are characterized by similarities in loan type, collateral type, risk attributes and the manner in which credit risk is assessed and monitored. The commercial segment is composed of multi-family, commercial and industrial, commercial real estate owner occupied, commercial real estate non-owner occupied and construction loan classes. The consumer segment is composed of residential real estate, manufactured housing and installment. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. For individually assessed loans, see related details in the Individually Assessed Loans section below. The allowance for credit losses on collectively assessed loans and leases is measured over the expected life of the loan or lease using lifetime loss rate models which consider historical loan performance, loan or borrower attributes and forecasts of future economic conditions in addition to information about past events and current conditions. Significant loan/borrower attributes utilized in the models include origination date, maturity date, collateral property type, internal risk rating, delinquency status, borrower state and FICO score at origination. Customers uses external sources in the creation of its forecasts, including current economic conditions and forecasts for macroeconomic variables over its reasonable and supportable forecast period (e.g., GDP growth rate, unemployment rate, BBB spread, commercial real estate and home price indices). After the reasonable and supportable forecast period, which ranges from two to five years, the models revert the forecasted macroeconomic variables to their historical long-term trends, without specific predictions for the economy, over the expected life of the pool. The lifetime loss rate models also incorporate prepayment assumptions into estimated lifetime loss rates. Customers runs the CECL impairment models on a quarterly basis and qualitatively adjusts model results for risk factors that are not considered within the models but which are relevant in assessing the expected credit losses within the loan and lease pools. Management generally considers the following qualitative factors: • Volume and severity of past-due loans, non-accrual loans and classified loans; • Lending policies and procedures, including underwriting standards and historically based loss/collection, charge-off and recovery practices; • Nature and volume of the portfolio; • Existence and effect of any credit concentrations and changes in the level of such concentrations; • Risk ratings; • The value of the underlying collateral for loans that are not collateral dependent; • Changes in the quality of the loan review system; • Experience, ability and depth of lending management and staff; • Other external factors, such as changes in legal, regulatory or competitive environment; and • Model and data limitations. Customers has elected to not estimate an allowance for credit losses on accrued interest receivable, as it already has a policy in place to reverse or write-off accrued interest, through interest income, in a timely manner. Accrued interest receivable is presented as a separate financial statement line item in the consolidated balance sheet. Purchased Credit Deteriorated (“PCD”) Loans and Leases PCD assets are acquired individual loans and leases (or acquired groups of loans and leases with similar risk characteristics) that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by an acquirer’s assessment. PCD loans and leases are recorded at their purchase price plus the allowance for credit losses expected at the time of acquisition, or “gross up” of the amortized cost basis. The January 1, 2020 transition adjustment discussed above was established for these loans and leases without affecting the income statement or retained earnings. Changes in the current estimate of the allowance for credit losses after acquisition from the estimated allowance previously recorded are reported in the income statement as provision for credit losses expense or reversal of provision for credit losses in subsequent periods as they arise. Purchased loans or leases that do not qualify as PCD assets are accounted for similar to originated assets, whereby an allowance for credit losses is recognized with a corresponding increase to the income statement provision for credit losses. Evidence that purchased loans and leases, measured at amortized cost, have more-than-insignificant deterioration in credit quality since origination and, therefore meet the PCD definition, may include loans and leases that are past-due, in non-accrual status, poor borrower credit score, recent loan-to-value percentages and other standard indicators (i.e., TDR, charge-offs, bankruptcy). Allowance for Credit Losses on Lending-Related Commitments Customers estimates expected credit losses over the contractual period in which it is exposed to credit risk on contractual obligations to extend credit, unless the obligation is unconditionally cancellable by Customers. The allowance for credit losses on lending-related commitments is recorded in accrued interest payable and other liabilities in the consolidated balance sheet and is recorded as a provision for credit losses within other non-interest expense in the consolidated income statement. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over their estimated lives. Customers estimates the expected credit losses for undrawn commitments using a usage given default calculation. The lifetime loss rates for off-balance sheet credit exposures are calculated in the same manner as on-balance sheet credit exposures, using the same models and economic forecasts, adjusted for the estimated likelihood that funding will occur. Individually Assessed Loans and Leases ASC 326 provides that a loan or lease is measured individually if it does not share similar risk characteristics with other financial assets. For Customers, loans and leases which are identified to be individually assessed under CECL typically would have been evaluated individually as impaired loans using accounting guidance in effect in periods prior to the adoption of CECL and include TDRs and collateral dependent loans. TDRs A loan for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties is considered to be a TDR. The allowance for credit loss on a TDR is measured using the same method as all other loans held for investment, except in cases when the value of a concession cannot be measured using a method other than the DCF method. When the value of a concession is measured using the DCF method, the allowance for credit loss is determined by discounting the expected future cash flows at the original effective interest rate of the loan. The CARES Act and certain regulatory agencies recently issued guidance stating certain loan modifications to borrowers experiencing financial distress as a result of the economic impacts created by COVID-19 may not be required to be treated as TDRs under U.S GAAP. For COVID-19 related loan modifications which met the loan modification criteria under either the CARES Act or the criteria specified by the regulatory agencies, Customers elected to suspend TDR accounting for such loan modifications. Collateral Dependent Loans Customers considers a loan to be collateral dependent when foreclosure of the underlying collateral is probable. Customers has also elected to apply the practical expedient to measure expected credit losses of a collateral dependent asset using the fair value of the collateral, less any estimated costs to sell, when foreclosure is not probable but repayment of the loan is expected to be provided substantially through the operation or sale of the collateral, and the borrower is experiencing financial difficulty. Allowance for Credit Losses on Available for Sale Securities For AFS debt securities in an unrealized loss position, Customers first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, Customers evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on AFS securities is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on AFS securities is recognized in other comprehensive income. Changes in the allowance for credit losses on AFS securities are recorded as provision, or reversal of provision for credit losses on AFS securities in other non-interest income within the consolidated income statement. Losses are charged against the allowance for credit losses on AFS securities when management believes the uncollectibility of an AFS security is confirmed or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS debt securities totaled $4.2 million at September 30, 2020 and is excluded from the estimate of credit losses. Other Accounting Standards Adopted in 2020 Standard Summary of guidance Effects on Financial Statements ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Issued April 2019 • Clarifies the scope of the credit losses standard and addresses issues related to accrued interest receivable balances, recoveries, variable interest rates, and prepayments. • Addresses partial-term fair value hedges, fair value hedge basis adjustments and certain transition requirements. • Addresses recognizing and measuring financial instruments, specifically the requirement for remeasurement under ASC 820 when using the measurement alternative, certain disclosure requirements and which equity securities have to be remeasured at historical exchange rates. • Topic 326 Amendments - Effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. Topic 815 Amendments - Effective for first annual period beginning after the issuance date of this ASU (i.e., fiscal year 2020). Entities that have already adopted the amendments in ASU 2017-12 may elect either to retrospectively apply all the amendments or to prospectively apply all amendments as of the date of adoption. Topic 825 Amendments - Effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. • Customers adopted on January 1, 2020. • The adoption of this guidance relating to Topics 815 and 825 did not have a material impact on Customers' financial condition, results of operations and consolidated financial statements. Please refer to ASU 2016-13 for further discussion on Customers' adoption of ASU 2016-13 (Topic 326). ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606 Issued November 2018 • Clarifies that certain transactions between collaborative arrangement participants should be accounted for as revenue under Topic 606 when the collaborative arrangement participant is a customer in the context of a unit of account. In those situations, all the guidance in Topic 606 should be applied, including recognition, measurement, presentation, and disclosure requirements. • Adds unit-of-account guidance in Topic 808 to align with the guidance in Topic 606 when an entity is assessing whether the collaborative arrangement or a part of the arrangement is within scope of Topic 606. • Requires that in a transaction with a collaborative arrangement participant that is not directly related to sales to third parties, presenting the transaction together with revenue recognized under Topic 606 is precluded if the collaborative arrangement participant is not a customer. • Effective for fiscal year beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. • Customers adopted on January 1, 2020. • The adoption of this guidance did not have a material impact on Customers' financial condition, results of operations and consolidated financial statements. Other Accounting Standards Adopted in 2020 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2018-15, Internal-Use Software (Subtopic 350-40): Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract Issued August 2018 • Clarifies that service contracts with hosting arrangements must follow internal-use software guidance Subtopic 350-40 when determining which implementation costs to capitalize as an asset related to the service contract and which costs to expense. • Customers adopted on January 1, 2020. Accounting Standards Issued But Not Yet Adopted Standard Summary of guidance Effects on Financial Statements ASU 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting Issued March 2020 • Provides optional guidance for a limited period of time to ease the potential burden in accounting for (or derecognizing the effects of) reference rate reform on financial reporting. Specifically, the amendments provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. These relate only to those contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. • Effective as of March 12, 2020 and can be adopted anytime during the period of January 1, 2020 through December 31, 2022. • Customers intends to adopt this guidance during adoption period and is currently evaluating the expected impact of this ASU on its financial condition, results of operations and consolidated financial statements. Accounting and Reporting Considerations related to COVID-19 On March 27, 2020, the CARES Act was signed into law and contained substantial tax and spending provisions intended to address the impact of the COVID-19 pandemic and stimulate the economy. The CARES Act includes the PPP designed to aid small-and medium-sized businesses through federally guaranteed loans distributed through banks. Customers is a participant in the PPP. Section 4013 of the CARES act also gives entities temporary relief from the accounting and disclosure requirements for TDRs under ASC 310-40 in certain situations. Accounting for PPP Loans In April 2020, Customers began to originate loans to qualified small businesses under the PPP administered by the SBA. The PPP loans are fully guaranteed by the SBA and may be eligible for forgiveness by the SBA to the extent that the proceeds are used for payroll and other permitted purposes in accordance with the requirements of the PPP. These loans carry a fixed rate of 1.00% and terms of two or five years, if not forgiven, in whole or in part. Payments are deferred for the first six months of the loan. The loans are 100% guaranteed by the SBA. The SBA pays the originating bank a processing fee ranging from 1% to 5% based on the size of the loan. Customers classified the PPP loans as held for investment and these loans are carried at amortized cost and interest income is recognized using the interest method. The origination fees, net of direct origination costs, are deferred and recognized as an adjustment to the yield of the related loans over their contractual life using the interest method. As PPP is newly created, Customers does not have historical prepayment data to accurately estimate principal prepayments and therefore has elected to not estimate prepayments as a policy election. No allowance for credit losses has been recognized for PPP loans as these loans are 100% guaranteed by the SBA. See Note 7 - Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases for additional information. Loan Modifications As mentioned above, Section 4013 of the CARES Act gives entities temporary relief from the accounting and disclosure requirements for TDRs. In addition, on April 7, 2020, certain regulatory banking agencies issued an interagency statement that offers practical expedients for evaluating whether loan modifications in response to the COVID-19 pandemic are TDRs. To qualify for TDR accounting and disclosure relief under the CARES Act, the applicable loan must not have been more than 30 days past due as of December 31, 2019, and the modification must be executed during the period beginning on March 1, 2020, and ending on the earlier of December 31, 2020, or the date that is 60 days after the termination date of the national emergency declared by the president on March 13, 2020, under the National Emergencies Act related to the outbreak of COVID-19. The CARES Act applies to modifications made as a result of COVID-19 including: forbearance agreements, interest rate modifications, repayment plans, and other arrangements to defer or delay payment of principal or interest. The interagency statement does not require the modification to be completed within a certain time period if it is related to COVID-19 and can be provided to borrowers either individually or as part of a loan modification program. Moreover, the interagency statement applies to short-term modifications (e.g. not more than six months deferral) including payment deferrals, fee waivers, extensions of repayment terms, or other insignificant payment delays as a result of COVID-19.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	EARNINGS (LOSS) PER SHARE The following are the components and results of Customers' earnings (loss) per common share calculations for the periods presented. Three Months Ended Nine Months Ended (amounts in thousands, except share and per share data) 2020 2019 2020 2019 Net income available to common shareholders $ 47,085 $ 23,451 $ 65,706 $ 40,957 Weighted-average number of common shares outstanding – basic 31,517,504 31,223,777 31,462,284 31,142,400 Share-based compensation plans 218,807 420,951 203,743 438,629 Weighted-average number of common shares – diluted 31,736,311 31,644,728 31,666,027 31,581,029 Basic earnings (loss) per common share $ 1.49 $ 0.75 $ 2.09 $ 1.32 Diluted earnings (loss) per common share $ 1.48 $ 0.74 $ 2.07 $ 1.30 The following are securities that could potentially dilute basic earnings per common share in future periods that were not included in the computation of diluted earnings per common share because either the performance conditions for certain of the share-based compensation awards have not been met or to do so would have been anti-dilutive for the periods presented. Three Months Ended Nine Months Ended 2020 2019 2020 2019 Share-based compensation awards 862,417 2,181,195 862,417 2,233,160

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss) By Component	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) By Component	CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT The following tables present the changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2020 and 2019. All amounts are presented net of tax. Amounts in parentheses indicate reductions to AOCI. Three Months Ended September 30, 2020 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - June 30, 2020 $ 27,525 $ (37,490) $ (9,965) Unrealized gains (losses) arising during period, before tax (1,090) 580 (510) Income tax effect 283 (151) 132 Other comprehensive income (loss) before reclassifications (807) 429 (378) Reclassification adjustments for (gains) losses included in net income, before tax (11,707) 4,400 (7,307) Income tax effect 3,044 (1,145) 1,899 Amounts reclassified from accumulated other comprehensive income (loss) to net income (8,663) 3,255 (5,408) Net current-period other comprehensive income (loss) (9,470) 3,684 (5,786) Balance - September 30, 2020 $ 18,055 $ (33,806) $ (15,751) Nine Months Ended September 30, 2020 (amounts in thousands) Unrealized Gains (Losses) Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - December 31, 2019 $ 14,287 $ (15,537) $ (1,250) Unrealized gains (losses) arising during period, before tax 25,127 (33,486) (8,359) Income tax effect (6,533) 8,884 2,351 Other comprehensive income (loss) before reclassifications 18,594 (24,602) (6,008) Reclassification adjustments for (gains) losses included in net income, before tax (20,035) 8,596 (11,439) Income tax effect 5,209 (2,263) 2,946 Amounts reclassified from accumulated other comprehensive income (loss) to net income (14,826) 6,333 (8,493) Net current-period other comprehensive income (loss) 3,768 (18,269) (14,501) Balance - September 30, 2020 $ 18,055 $ (33,806) $ (15,751) (1) Reclassification amounts for available for sale debt securities are reported as gain or loss on sale of investment securities on the consolidated statements of income. (2) Reclassification amounts for cash flow hedges are reported as interest expense for the applicable hedged items on the consolidated statements of income. Three Months Ended September 30, 2019 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - June 30, 2019 $ 6,802 $ (16,795) $ (9,993) Unrealized gains (losses) arising during period, before tax 7,858 (5,163) 2,695 Income tax effect (2,043) 1,342 (701) Other comprehensive income (loss) before reclassifications 5,815 (3,821) 1,994 Reclassification adjustments for losses (gains) included in net income, before tax (1,001) 764 (237) Income tax effect 260 (198) 62 Amounts reclassified from accumulated other comprehensive income (loss) to net income (741) 566 (175) Net current-period other comprehensive income (loss) 5,074 (3,255) 1,819 Balance - September 30, 2019 $ 11,876 $ (20,050) $ (8,174) Nine Months Ended September 30, 2019 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - December 31, 2018 $ (21,741) $ (922) $ (22,663) Unrealized gains (losses) arising during period, before tax 46,430 (26,204) 20,226 Income tax effect (12,072) 6,813 (5,259) Other comprehensive income (loss) before reclassifications 34,358 (19,391) 14,967 Reclassification adjustments for losses (gains) included in net income, before tax (1,001) 355 (646) Income tax effect 260 (92) 168 Amounts reclassified from accumulated other comprehensive income (loss) to net income (741) 263 (478) Net current-period other comprehensive income 33,617 (19,128) 14,489 Balance - September 30, 2019 $ 11,876 $ (20,050) $ (8,174) (1) Reclassification amounts for available for sale debt securities are reported as gain or loss on sale of investment securities on the consolidated statements of income. (2) Reclassification amounts for cash flow hedges are reported as interest expense for the applicable hedged items on the consolidated statements of income.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES The amortized cost and fair value of investment securities as of September 30, 2020 and December 31, 2019 are summarized in the tables below: September 30, 2020 (1) (amounts in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale debt securities: Asset-backed securities $ 374,151 $ 1,404 $ (174) $ 375,381 U.S. government agencies securities 40,000 8 — 40,008 Agency-guaranteed residential mortgage-backed securities 59,013 2,066 — 61,079 Agency-guaranteed collateralized mortgage obligations 153,088 771 (80) 153,779 State and political subdivision debt securities (2) 17,391 868 — 18,259 Private label collateralized mortgage obligations 118,979 8 — 118,987 Corporate notes (3) 344,344 19,632 (104) 363,872 Available for sale debt securities $ 1,106,966 $ 24,757 $ (358) 1,131,365 Equity securities (5) 2,466 Total investment securities, at fair value $ 1,133,831 December 31, 2019 (amounts in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale debt securities: Agency-guaranteed residential mortgage-backed securities $ 273,252 $ 5,069 $ — $ 278,321 Corporate notes (3) 284,639 14,238 — 298,877 Available for sale debt securities $ 557,891 $ 19,307 $ — 577,198 Interest-only GNMA securities (4) 16,272 Equity securities (5) 2,406 Total investment securities, at fair value $ 595,876 (1) Accrued interest on AFS debt securities totaled $4.2 million at September 30, 2020 and is included in accrued interest receivable on the consolidated balance sheet. (2) Includes both taxable and non-taxable municipal securities. (3) Includes corporate securities issued by domestic bank holding companies. (4) Reported at fair value with fair value changes recorded in non-interest income based on a fair value option election. (5) Includes equity securities issued by a foreign entity. On June 28, 2019, Customers obtained ownership of certain interest-only GNMA securities that served as the primary collateral for loans made to one commercial mortgage warehouse customer through a Uniform Commercial Code private sale transaction. In connection with the acquisition of the interest-only GNMA securities, Customers recognized a pre-tax loss of $7.5 million for the three months ended June 30, 2019 for the shortfall in the fair value of the interest-only GNMA securities compared to its credit exposure to this commercial mortgage warehouse customer. Upon acquisition, Customers elected the fair value option for these interest-only GNMA securities. These securities were sold for $15.4 million with a realized gain of $1.0 million during the three months ended September 30, 2020. During the three and nine months ended September 30, 2020, Customers recognized unrealized gains of $0.2 million and $0.1 million, respectively, on its equity securities. During the three and nine months ended September 30, 2019, Customers recognized unrealized gains of $1.3 million and $1.0 million, respectively, on its equity securities. These unrealized gains and losses are reported as unrealized gain (loss) on investment securities within non-interest income on the consolidated statements of income. Proceeds from the sale of available for sale debt securities were $268.6 million and $377.8 million for the three and nine months ended September 30, 2020. Realized gains from the sale of available for sale debt securities were $11.7 million and $20.0 million for the three and nine months ended September 30, 2020, respectively. Proceeds from the sale of available for sale debt securities were $97.6 million for the three and nine months ended September 30, 2019. Realized gains from the sale of available for sale debt securities were $1.0 million for the three and nine months ended September 30, 2019. These gains (losses) were determined using the specific identification method and were reported as gain (loss) on sale of investment securities within non-interest income on the consolidated statements of income. The following table shows debt securities by stated maturity. Debt securities backed by mortgages and other assets securities have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and, therefore, these debt securities are classified separately with no specific maturity date: September 30, 2020 (amounts in thousands) Amortized Fair Due in one year or less $ 8,000 $ 8,000 Due after one year through five years 83,209 84,275 Due after five years through ten years 274,135 292,605 Due after ten years 36,391 37,259 Asset-backed securities 374,151 375,381 Agency-guaranteed residential mortgage-backed securities 59,013 61,079 Agency-guaranteed collateralized mortgage obligations 153,088 153,779 Private label collateralized mortgage obligations 118,979 118,987 Total debt securities $ 1,106,966 $ 1,131,365 Gross unrealized losses and fair value of Customers' available for sale debt securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2020 were as follows: September 30, 2020 Less Than 12 Months 12 Months or More Total (amounts in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available for sale debt securities: Asset-backed securities $ 107,610 $ (174) $ — $ — $ 107,610 $ (174) Agency-guaranteed residential mortgage-backed securities 19,019 (80) — — 19,019 (80) Corporate notes 40,409 (104) — — 40,409 (104) Total $ 167,038 $ (358) $ — $ — $ 167,038 $ (358) At September 30, 2020, there were fifteen available for sale debt securities with unrealized losses in the less-than-twelve-month category and no available for sale debt securities with unrealized losses in the twelve-month-or-more category. The unrealized losses were principally due to changes in market interest rates that resulted in a negative impact on the respective securities' fair value. All amounts related to these securities are expected to be recovered when market prices recover or at maturity. Customers does not intend to sell any of the 15 securities, and it is not more likely than not that Customers will be required to sell any of the 15 securities before recovery of the amortized cost basis. At December 31, 2019, there were no available for sale debt securities in an unrealized loss position. At September 30, 2020 and December 31, 2019, Customers Bank had pledged investment securities aggregating $20.1 million and $20.4 million in fair value, respectively, as collateral against its borrowings primarily with an unused line of credit with another financial institution. These counterparties do not have the ability to sell or repledge these securities. At September 30, 2020 and December 31, 2019, no securities holding of any one issuer, other than the U.S. Government and its agencies, amounted to greater than 10% of shareholders' equity.

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2020
Receivables Held-for-sale [Abstract]
Loans Held for Sale	LOANS HELD FOR SALE The composition of loans held for sale as of September 30, 2020 and December 31, 2019 was as follows: (amounts in thousands) September 30, 2020 December 31, 2019 Commercial loans: Multi-family loans, at lower of cost or fair value $ — $ 482,873 Commercial real estate non-owner occupied loans, at lower of cost or fair value 18,366 — Total commercial loans held for sale 18,366 482,873 Consumer loans: Home equity conversion mortgages, at lower of cost or fair value 1,325 1,325 Residential mortgage loans, at fair value 6,998 2,130 Total consumer loans held for sale 8,323 3,455 Loans held for sale $ 26,689 $ 486,328 Effective September 30, 2020, Customers transferred $401.1 million of multi-family loans from loans held for sale to loans receivable (held for investment) because it no longer has the intent to sell these loans. Customers transferred these loans at their carrying value, which approximated their fair value at the time of transfer. Total loans held for sale as of September 30, 2020 and December 31, 2019 included NPLs of $19.7 million and $1.3 million, respectively.

Loans and Leases Receivable and

Loans and Leases Receivable and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans and Leases Receivable and Allowance for Credit Losses	LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES The following table presents loans and leases receivable as of September 30, 2020 and December 31, 2019. (amounts in thousands) September 30, 2020 December 31, 2019 Loans and leases receivable, mortgage warehouse, at fair value $ 3,913,593 $ 2,245,758 Loans receivable, PPP 4,964,105 — Loans receivable: Commercial: Multi-family 1,950,300 1,907,331 Commercial and industrial (1) 2,220,715 1,891,152 Commercial real estate owner occupied 557,595 551,948 Commercial real estate non-owner occupied 1,215,516 1,222,772 Construction 122,963 117,617 Total commercial loans and leases receivable 6,067,089 5,690,820 Consumer: Residential real estate 335,452 382,634 Manufactured housing 64,638 71,359 Installment 1,233,713 1,174,175 Total consumer loans receivable 1,633,803 1,628,168 Loans and leases receivable (2) 7,700,892 7,318,988 Allowance for credit losses (155,561) (56,379) Total loans and leases receivable, net of allowance for credit losses $ 16,423,029 $ 9,508,367 (1) Includes direct finance equipment leases of $106.5 million and $89.2 million at September 30, 2020 and December 31, 2019, respectively. (2) Includes deferred (fees) costs and unamortized (discounts) premiums, net of $(74.7) million and $2.1 million at September 30, 2020 and December 31, 2019, respectively. Customers' total loans and leases receivable portfolio includes loans receivable which are reported at fair value based on an election made to account for these loans at fair value and loans and leases receivable which are predominately reported at their outstanding unpaid principal balance, net of charge-offs and deferred costs and fees and unamortized premiums and discounts and are evaluated for impairment. The total amount of accrued interest recorded for total loans was $61.9 million and $34.8 million at September 30, 2020 and December 31, 2019, respectively, and is presented in accrued interest receivable in the consolidated balance sheet. At September 30, 2020, there were $32.1 million of individually evaluated loans that were collateral-dependent. Substantially all individually evaluated loans are collateral-dependent and consisted primarily of commercial and industrial, commercial real estate, and residential real estate loans. Collateral-dependent commercial and industrial loans were secured by accounts receivable, inventory and equipment; collateral-dependent commercial real estate loans were secured by commercial real estate assets; and residential real estate loans were secured by residential real estate assets. Loans receivable, PPP: On March 27, 2020, the CARES Act was signed into law and created funding for a new product called the PPP. The PPP is administered by the SBA and is intended to assist organizations with payroll related expenses. Customers had $5.0 billion of PPP loans outstanding as of September 30, 2020, which are fully guaranteed by the SBA and earn a fixed interest rate of 1.00%. Customers recognized interest income, including origination fees, of $24.3 million and $36.0 million for the three and nine months ended September 30, 2020, respectively. Loans receivable, mortgage warehouse, at fair value: Mortgage warehouse loans consist of commercial loans to mortgage companies. These mortgage warehouse lending transactions are subject to master repurchase agreements. As a result of the contractual provisions, for accounting purposes control of the underlying mortgage loan has not transferred and the rewards and risks of the mortgage loans are not assumed by Customers. The mortgage warehouse loans are designated as loans held for investment and reported at fair value based on an election made to account for the loans at fair value. Pursuant to the agreements, Customers funds the pipelines for these mortgage lenders by sending payments directly to the closing agents for funded mortgage loans and receives proceeds directly from third party investors when the underlying mortgage loans are sold into the secondary market. The fair value of the mortgage warehouse loans is estimated as the amount of cash initially advanced to fund the mortgage, plus accrued interest and fees, as specified in the respective agreements. The interest rates on these loans are variable, and the lending transactions are short-term, with an average life under 30 days from purchase to sale. The primary goal of these lending transactions is to provide liquidity to mortgage companies. At September 30, 2020 and December 31, 2019, all of Customers' commercial mortgage warehouse loans were current in terms of payment. As these loans are reported at their fair value, they do not have an ACL and are therefore excluded from ACL-related disclosures. Loans and leases receivable: The following tables summarize loans and leases receivable by loan and lease type and performance status as of September 30, 2020 and December 31, 2019: September 30, 2020 (amounts in thousands) 30-59 Days past due 60-89 Days past due 90 Days or more past due Total past due Loans and leases not past due (2) Total loans and leases (3) Multi-family $ — $ 15,446 $ 4,790 $ 20,236 $ 1,930,064 $ 1,950,300 Commercial and industrial — 2,072 7,695 9,767 2,210,948 2,220,715 Commercial real estate owner occupied — 952 2,436 3,388 554,207 557,595 Commercial real estate non-owner occupied — — 2,356 2,356 1,213,160 1,215,516 Construction — — — — 122,963 122,963 Residential real estate 436 3,160 6,327 9,923 325,529 335,452 Manufactured housing 784 608 4,463 5,855 58,783 64,638 Installment 5,468 4,609 3,098 13,175 1,220,538 1,233,713 Total $ 6,688 $ 26,847 $ 31,165 $ 64,700 $ 7,636,192 $ 7,700,892 December 31, 2019 (amounts in thousands) 30-89 Days past due (1) 90 Days or more past due (1) Total past due (1) Non-accrual Current (2) Purchased-credit-impaired loans (4) Total loans and leases (5) Multi-family $ 2,133 — $ 2,133 $ 4,117 $ 1,901,336 $ 1,688 $ 1,909,274 Commercial and industrial 2,395 — 2,395 4,531 1,882,700 354 1,889,980 Commercial real estate owner occupied 5,388 — 5,388 1,963 537,992 6,664 552,007 Commercial real estate non-owner occupied 8,034 — 8,034 76 1,211,892 3,527 1,223,529 Construction — — — — 118,418 — 118,418 Residential real estate 5,924 — 5,924 6,128 359,491 3,471 375,014 Manufactured housing 3,699 1,794 5,493 1,655 61,649 1,601 70,398 Installment 5,756 $ — 5,756 1,551 1,170,793 183 1,178,283 Total $ 33,329 $ 1,794 $ 35,123 $ 20,021 $ 7,244,271 $ 17,488 $ 7,316,903 (1) Includes past due loans and leases that are accruing interest because collection is considered probable. (2) Loans and leases where next payment due is less than 30 days from the report date. The September 30, 2020 table excludes PPP loans of $5.0 billion which are all current as of September 30, 2020. (3) Includes purchased credit deteriorated loans of $14.4 million at September 30, 2020. (4) Purchased-credit-impaired loans aggregated into a pool are accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows, and the past due status of the pools, or that of the individual loans within the pools, is not meaningful. Due to the credit impaired nature of the loans, the loans are recorded at a discount reflecting estimated future cash flows and the Bank recognizes interest income on each pool of loans reflecting the estimated yield and passage of time. Such loans are considered to be performing. Purchased-credit-impaired loans that are not in pools accrete interest when the timing and amount of their expected cash flows are reasonably estimable, and are reported as performing loans. (5) Amounts exclude deferred costs and fees and unamortized premiums and discounts. As of September 30, 2020 and December 31, 2019, the Bank had $0.1 million and $0.2 million, respectively, of residential real estate held in OREO. As of September 30, 2020 and December 31, 2019, the Bank had initiated foreclosure proceedings on $0.5 million and $0.9 million, respectively, in loans secured by residential real estate. Nonaccrual Loans and Leases The following table presents the amortized cost of loans and leases on nonaccrual status. September 30, 2020 (1) December 31, 2019 (2) (amounts in thousands) Nonaccrual loans with no related allowance Nonaccrual loans with related allowance Total nonaccrual loans Nonaccrual loans with no related allowance Nonaccrual loans with related allowance Total nonaccrual loans Multi-family $ 8,749 $ 2,961 $ 11,710 $ 4,117 $ — $ 4,117 Commercial and industrial 8,749 884 9,633 3,083 1,448 4,531 Commercial real estate owner occupied 3,399 200 3,599 1,109 854 1,963 Commercial real estate non-owner occupied 2,408 — 2,408 76 — 76 Residential real estate 10,634 — 10,634 4,559 1,569 6,128 Manufactured housing — 2,778 2,778 — 1,655 1,655 Installment — 3,118 3,118 140 1,411 1,551 Total $ 33,939 $ 9,941 $ 43,880 $ 13,084 $ 6,937 $ 20,021 (1) Presented at amortized cost basis. (2) Amounts exclude deferred costs and fees and unamortized premiums and discounts. Interest income recognized on nonaccrual loans was insignificant during the three and nine months ended September 30, 2020. Accrued interest of $1.2 million was reversed when the loans went to nonaccrual status during the nine months ended September 30, 2020. Allowance for credit losses on loans and leases The changes in the allowance for credit losses on loans and leases for the three and nine months ended September 30, 2020 and 2019 are presented in the tables below. Three Months Ended September 30, 2020 Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (amounts in thousands) Ending Balance, $ 14,697 $ 12,302 $ 11,405 $ 26,493 $ 5,297 $ 4,550 $ 6,014 $ 79,147 $ 159,905 Charge-offs — (2,527) (44) (10,181) — — — (9,194) (21,946) Recoveries — 2,582 — 1,258 6 17 — 784 4,647 Provision for credit loss expense 329 569 (1,809) 2,630 1,120 82 (389) 10,423 12,955 Ending Balance, $ 15,026 $ 12,926 $ 9,552 $ 20,200 $ 6,423 $ 4,649 $ 5,625 $ 81,160 $ 155,561 Nine Months Ended Ending Balance, $ 6,157 $ 15,556 $ 2,235 $ 6,243 $ 1,262 $ 3,218 $ 1,060 $ 20,648 $ 56,379 Cumulative effect of change in accounting principle 2,171 759 5,773 7,918 (98) 1,518 3,802 57,986 79,829 Charge-offs — (2,645) (44) (25,779) — — — (23,744) (52,212) Recoveries — 2,661 5 1,258 122 72 — 1,759 5,877 Provision for loan and lease losses 6,698 (3,405) 1,583 30,560 5,137 (159) 763 24,511 65,688 Ending Balance, $ 15,026 $ 12,926 $ 9,552 $ 20,200 $ 6,423 $ 4,649 $ 5,625 $ 81,160 $ 155,561 Three Months Ended September 30, 2019 Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (amounts in thousands) Ending Balance, $ 9,926 $ 13,736 $ 3,360 $ 6,159 $ 649 $ 4,168 $ 123 $ 10,267 $ 48,388 Charge-offs — (349) (45) — — — — (1,806) (2,200) Recoveries — 369 10 — 8 5 — 47 439 Provision for loan and lease losses (2,428) 2,119 (435) 281 1 (90) 904 4,074 4,426 Ending Balance, $ 7,498 $ 15,875 $ 2,890 $ 6,440 $ 658 $ 4,083 $ 1,027 $ 12,582 $ 51,053 Nine Months Ended Ending Balance, $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 Charge-offs (541) (532) (119) — — (109) — (3,493) (4,794) Recoveries 7 826 235 — 128 20 — 120 1,336 Provision for loan and lease losses (3,430) 3,436 (546) 347 (94) 518 882 13,426 14,539 Ending Balance, $ 7,498 $ 15,875 $ 2,890 $ 6,440 $ 658 $ 4,083 $ 1,027 $ 12,582 $ 51,053 At September 30, 2020, the ACL was $155.6 million, an increase of $19.4 million from the January 1, 2020 balance of $136.2 million. The increase resulted primarily from the impact of reserve build for the COVID-19 pandemic including the change in macroeconomic forecasts, an increase in net charge-offs, mostly attributed to the commercial real estate non-owner occupied and installment portfolios, and portfolio growth mainly in the installment portfolio. Commercial real estate non-owner occupied charge-offs are attributable to two collateral dependent loans. Installment charge-offs are attributable to delinquencies and defaults of originated and purchased unsecured consumer installment loans through arrangements with fintech companies and other market place lenders. PPP loans include an embedded credit enhancement guarantee from the SBA, which guarantees 100% of all principal and interest owed by the borrower. Therefore, Customers did not include an ACL for PPP loans as of September 30, 2020. Troubled Debt Restructurings At September 30, 2020 and December 31, 2019, there were $16.1 million and $13.3 million, respectively, in loans reported as TDRs. TDRs are reported as impaired loans in the quarter of their restructuring and are evaluated to determine whether they should be placed on non-accrual status. In subsequent quarters, a TDR may be returned to accrual status if it satisfies a minimum performance requirement of six months, however, it will remain classified as impaired. Generally, the Bank requires sustained performance for nine months before returning a TDR to accrual status. Customers had no lease receivables that had been restructured as a TDR as of September 30, 2020 and December 31, 2019, respectively. The CARES Act and certain regulatory agencies recently issued guidance stating certain loan modifications to borrowers experiencing financial distress as a result of the economic impacts created by COVID-19 may not be required to be treated as TDRs under U.S GAAP. For COVID-19 related loan modifications which met the loan modification criteria under either the CARES Act or the criteria specified by the regulatory agencies, Customers elected to suspend TDR accounting for such loan modifications. At September 30, 2020, commercial and consumer deferments related to COVID-19 were $79.0 million and $25.0 million, respectively. The following table presents loans modified in a TDR by type of concession for the three and nine months ended September 30, 2020 and 2019. There were no modifications that involved forgiveness of debt for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 (dollars in thousands) Number of loans Recorded investment Number of loans Recorded investment Number of loans Recorded investment Number of loans Recorded investment Extensions of maturity — $ — — $ — 6 $ 385 2 $ 514 Interest-rate reductions 2 88 7 196 34 1,461 19 628 Other (1) 65 1,385 — — 65 1,385 — — Total 67 $ 1,473 7 $ 196 105 $ 3,231 21 $ 1,142 (1) Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, or other concessions. As of September 30, 2020 and December 31, 2019, there were no commitments to lend additional funds to debtors whose loans have been modified in TDRs. The following table presents, by loan type, the number of loans modified in TDRs and the related recorded investment, for which there was a payment default within twelve months following the modification: September 30, 2020 September 30, 2019 (dollars in thousands) Number of loans Recorded investment Number of loans Recorded investment Manufactured housing 5 $ 201 3 $ 76 Commercial real estate owner occupied 1 952 — — Residential real estate 1 95 1 82 Installment 8 $ 126 — $ — Total loans 15 $ 1,374 4 $ 158 Loans modified in TDRs are evaluated for impairment. The nature and extent of impairment of TDRs, including those which have experienced a subsequent default, is considered in the determination of an appropriate level of ACL. Purchased Credit-Deteriorated Loans Customers adopted ASC 326 using the prospective transition approach for financial assets purchased with credit deterioration that were previously classified as PCI and accounted for under ASC 310-30. In accordance with the standard, Customers did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets were adjusted to reflect the addition of $0.2 million of the allowance for credit losses on PCD loans and leases. The remaining noncredit discount of $0.3 million, based on the adjusted amortized cost basis, will be accreted into interest income at the effective interest rate as of January 1, 2020. As of September 30, 2020, the amortized cost basis of PCD assets amounted to $14.4 million. Credit Quality Indicators The ACL represents management's estimate of expected losses in Customers' loans and leases receivable portfolio, excluding commercial mortgage warehouse loans reported at fair value pursuant to a fair value option election and PPP loans receivable. Multi-family, commercial and industrial, owner occupied commercial real estate, non-owner occupied commercial real estate, and construction loans are rated based on an internally assigned risk rating system which is assigned at the time of loan origination and reviewed on a periodic, or on an “as needed” basis. Residential real estate loans, manufactured housing and installment loans are evaluated based on the payment activity of the loan. To facilitate the monitoring of credit quality within the multi-family, commercial and industrial, owner occupied commercial real estate, non-owner occupied commercial real estate, and construction loan portfolios, and as an input in the ACL lifetime loss rate model for the C&I portfolio, the Bank utilizes the following categories of risk ratings: pass/satisfactory (includes risk rating 1 through 6), special mention, substandard, doubtful, and loss. The risk rating categories, which are derived from standard regulatory rating definitions, are assigned upon initial approval of credit to borrowers and updated periodically thereafter. Pass/satisfactory ratings, which are assigned to those borrowers who do not have identified potential or well-defined weaknesses and for whom there is a high likelihood of orderly repayment, are updated periodically based on the size and credit characteristics of the borrower. All other categories are updated on a quarterly basis during the month preceding the end of the calendar quarter. While assigning risk ratings involves judgment, the risk-rating process allows management to identify riskier credits in a timely manner and allocate the appropriate resources to manage those loans and leases. The 2019 Form 10-K describes Customers Bancorp’s risk rating grades. Risk ratings are not established for certain consumer loans, including residential real estate, home equity, manufactured housing, and installment loans, mainly because these portfolios consist of a larger number of homogeneous loans with smaller balances. Instead, these portfolios are evaluated for risk mainly based upon aggregate payment history through the monitoring of delinquency levels and trends and are classified as performing and non-performing. The following tables present the credit ratings of loans and leases receivable as of September 30, 2020 and December 31, 2019. PPP loans are excluded in the tables below as these loans are fully guaranteed by the SBA. Term Loans Amortized Cost Basis by Origination Year (in thousands) 2020 2019 2018 2017 2016 Prior Revolving loans amortized cost basis Revolving loans converted to term Total Multi-family loans: Pass $ 139,734 $ 23,396 $ 305,351 $ 626,402 $ 271,981 $ 485,023 $ — $ — $ 1,851,887 Special mention — — — 22,430 10,424 26,836 — — 59,690 Substandard — — — 17,859 13,799 7,065 — — 38,723 Doubtful — — — — — — — — — Total multi-family loans $ 139,734 $ 23,396 $ 305,351 $ 666,691 $ 296,204 $ 518,924 $ — $ — $ 1,950,300 Commercial and industrial loans and leases: Pass $ 564,313 $ 418,961 $ 153,659 $ 118,548 $ 48,470 $ 81,179 $ 739,151 $ — $ 2,124,281 Special mention 13,200 1,193 222 14,739 112 15,348 1,315 — 46,129 Substandard 6,421 9,037 14,343 1,611 8,084 2,925 7,884 — 50,305 Doubtful — — — — — — — — — Total commercial and industrial loans and leases $ 583,934 $ 429,191 $ 168,224 $ 134,898 $ 56,666 $ 99,452 $ 748,350 $ — $ 2,220,715 Commercial real estate owner occupied loans: Pass $ 46,303 $ 185,921 $ 88,291 $ 71,438 $ 48,202 $ 93,679 $ 741 $ — $ 534,575 Special mention — — 478 9,260 — 245 — — 9,983 Substandard — — — 347 2,243 10,447 — — 13,037 Doubtful — — — — — — — — — Total commercial real estate owner occupied loans $ 46,303 $ 185,921 $ 88,769 $ 81,045 $ 50,445 $ 104,371 $ 741 $ — $ 557,595 Commercial real estate non-owner occupied: Pass $ 135,589 $ 113,247 $ 116,794 $ 225,952 $ 197,116 $ 346,107 $ — $ — $ 1,134,805 Special mention — — — — — 10,559 — — 10,559 Substandard — — — 20,611 2,419 47,122 — — 70,152 Doubtful — — — — — — — — — Total commercial real estate non-owner occupied loans $ 135,589 $ 113,247 $ 116,794 $ 246,563 $ 199,535 $ 403,788 $ — $ — $ 1,215,516 Construction: Pass $ 8,679 $ 98,231 $ 4,571 $ — $ 9,768 $ — $ 1,714 $ — $ 122,963 Special mention — — — — — — — — — Substandard — — — — — — — — — Doubtful — — — — — — — — — Total construction loans $ 8,679 $ 98,231 $ 4,571 $ — $ 9,768 $ — $ 1,714 $ — $ 122,963 Total commercial loans and leases receivable $ 914,239 $ 849,986 $ 683,709 $ 1,129,197 $ 612,618 $ 1,126,535 $ 750,805 $ — $ 6,067,089 Residential real estate loans: Performing $ 7,514 $ 15,252 $ 7,647 $ 12,246 $ 42,883 $ 78,365 $ 161,575 $ — $ 325,482 Non-performing — — 160 785 1,350 4,395 3,280 — 9,970 Total residential real estate loans $ 7,514 $ 15,252 $ 7,807 $ 13,031 $ 44,233 $ 82,760 $ 164,855 $ — $ 335,452 Manufactured housing loans: Performing $ — $ 307 $ 632 $ 79 $ 42 $ 59,193 $ — $ — $ 60,253 Non-performing — — — — — 4,385 — — 4,385 Total manufactured housing loans $ — $ 307 $ 632 $ 79 $ 42 $ 63,578 $ — $ — $ 64,638 Installment loans: Performing $ 318,780 $ 790,192 $ 115,024 $ 4,726 $ 513 $ 1,201 $ — $ — $ 1,230,436 Non-performing 305 2,326 485 41 2 118 — — 3,277 Total installment loans $ 319,085 $ 792,518 $ 115,509 $ 4,767 $ 515 $ 1,319 $ — $ — $ 1,233,713 Total consumer loans $ 326,599 $ 808,077 $ 123,948 $ 17,877 $ 44,790 $ 147,657 $ 164,855 $ — $ 1,633,803 Loans and leases receivable $ 1,240,838 $ 1,658,063 $ 807,657 $ 1,147,074 $ 657,408 $ 1,274,192 $ 915,660 $ — $ 7,700,892 December 31, 2019 (amounts in thousands) Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (3) Pass/Satisfactory $ 1,816,200 $ 1,841,074 $ 536,777 $ 1,129,838 $ 118,418 $ — $ — $ — $ 5,442,307 Special Mention 69,637 26,285 8,286 6,949 — — — — 111,157 Substandard 23,437 22,621 6,944 86,742 — — — — 139,744 Performing (1) — — — — — 362,962 63,250 1,170,976 1,597,188 Non-performing (2) — — — — — 12,052 7,148 7,307 26,507 Total $ 1,909,274 $ 1,889,980 $ 552,007 $ 1,223,529 $ 118,418 $ 375,014 $ 70,398 $ 1,178,283 $ 7,316,903 (1) Includes residential real estate, manufactured housing, and installment loans not assigned internal ratings. (2) Includes residential real estate, manufactured housing, and installment loans that are past due and still accruing interest or on nonaccrual status. (3) Excludes commercial mortgage warehouse loans reported at fair value. Loan Purchases and Sales Purchases and sales of loans were as follows for the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) 2020 2019 2020 2019 Purchases (1) Residential real estate $ — $ — $ 495 $ 105,858 Installment (2) 15,700 83,898 225,468 534,150 Total $ 15,700 $ 83,898 $ 225,963 $ 640,008 Sales (3) Commercial and industrial $ 3,968 $ — $ 3,968 $ — Commercial real estate non-owner occupied $ 17,600 $ — $ 17,600 $ — Installment — — 1,822 — Total $ 21,568 $ — $ 23,390 $ — (1) Amounts reported in the above table are the unpaid principal balance at time of purchase. The purchase price was 98.1% and 96.3% of loans outstanding for the three months ended September 30, 2020 and 2019, respectively. The purchase price was 100.2% and 99.4% of loans outstanding for the nine months ended September 30, 2020 and 2019, respectively. (2) Installment loan purchases for the three and nine months ended September 30, 2020 and 2019 consist of third-party originated unsecured consumer loans. None of the loans are considered sub-prime at the time of origination. Customers considers sub-prime borrowers to be those with FICO scores below 660. (3) Amounts reported in the above table are the unpaid principal balance at time of sale. There were no loan sales in the three and nine months ended September 30, 2019. During September 2020, Customers sold a collateral dependent loan secured by a Class A office building in northern New Jersey for $17.6 million equal to the loan's carrying value at the date of sale. Loans Pledged as Collateral Customers has pledged eligible real estate and commercial and industrial loans as collateral for borrowings from the FHLB and FRB in the amount of $8.9 billion and $4.6 billion at September 30, 2020 and December 31, 2019, respectively. The increase in loans pledged as collateral relates to $4.8 billion of PPP loans that were pledged to the FRB in accordance with borrowing from the PPPLF.

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	LEASES Lessee Customers has operating leases for its branches, LPOs, and administrative offices, with remaining lease terms ranging between 2 month and 7 years. These operating leases comprise substantially all of Customers' obligations in which Customers is the lessee. Most lease agreements consist of initial lease terms ranging between 1 and 5 years, with options to renew the leases or extend the term up to 15 years at Customers' sole discretion. Some operating leases include variable lease payments that are based on an index or rate, such as the CPI. Variable lease payments are not included in the liability or right of use asset and are recognized in the period in which the obligation for those payments are incurred. Customers' operating lease agreements do not contain any material residual value guarantees or material restrictive covenants. Pursuant to these agreements, Customers does not have any commitments that would meet the definition of a finance lease. As most of Customers' operating leases do not provide an implicit rate, Customers utilized its incremental borrowing rate based on the information available at either the adoption of ASC 842 or the commencement date of the lease, whichever was later, when determining the present value of lease payments. The following table summarizes operating lease ROU assets and operating lease liabilities and their corresponding balance sheet location: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Operating lease ROU assets Other assets $ 18,419 $ 20,232 LIABILITIES Operating lease liabilities Other liabilities $ 19,813 $ 21,358 The following table summarizes operating lease cost and its corresponding income statement location for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Classification 2020 2019 2020 2019 Operating lease cost (1) Occupancy expenses $ 1,643 $ 1,470 $ 4,597 $ 4,400 (1) There were no variable lease costs for the three and nine months ended September 30, 2020 and 2019, and sublease income for operating leases is immaterial. Maturities of non-cancelable operating lease liabilities were as follows at September 30, 2020: (amounts in thousands) September 30, 2020 2020 $ 2,610 2021 5,134 2022 4,653 2023 3,759 2024 2,673 Thereafter 3,026 Total minimum payments 21,855 Less: interest 2,042 Present value of lease liabilities $ 19,813 Customers does not have leases where it is involved with the construction or design of an underlying asset. Customers has no legally binding minimum lease payments for leases signed but not yet commenced as of September 30, 2020. Cash paid pursuant to the operating lease liability was $1.4 million and $4.4 million for the three and nine months ended September 30, 2020, respectively. Cash paid pursuant to the operating lease liability was $1.4 million and $4.2 million for the three and nine months ended September 30, 2019, respectively. These payments were reported as cash flows used in operating activities in the statement of cash flows. The following table summarizes the weighted average remaining lease term and discount rate for Customers' operating leases at September 30, 2020 and December 31, 2019: (amounts in thousands) September 30, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 4.6 years 5.0 years Weighted average discount rate Operating leases 2.69 % 2.90 % Equipment Lessor CCF is a wholly-owned subsidiary of Customers Bank and is referred to as the Equipment Finance Group. CCF is primarily focused on originating equipment operating and direct finance equipment leases for a broad range of asset classes. It services vendors, dealers, independent finance companies, bank-owned leasing companies and strategic direct customers in the plastics, packaging, machine tool, construction, transportation and franchise markets. Lease terms typically range from 24 months to 120 months. CCF offers the following lease products: Capital Lease, Purchase Upon Termination, TRAC, Split-TRAC, and FMV. Direct finance equipment leases are included in commercial and industrial loans and leases receivable. The estimated residual values for direct finance and operating leases are established by utilizing internally developed analyses, external studies, and/or third-party appraisals to establish a residual position. For the direct finance leases, only Customers' Split-TRAC leases have residual risk and the unguaranteed portions are typically nominal. Expected credit losses on direct financing leases and the related estimated residual values are included in the allowance for credit losses on loans and leases. Leased assets under operating leases are carried at amortized cost net of accumulated depreciation and any impairment charges and are presented in other assets. The depreciation expense of the leased assets is recognized on a straight-line basis over the contractual term of the leases up to the expected residual value. The expected residual value and, accordingly, the monthly depreciation expense, may change throughout the term of the lease. Operating lease rental income for leased assets is recognized in commercial lease income on a straight-line basis over the lease term. Customers periodically reviews its operating leased assets for impairment. An impairment loss is recognized if the carrying amount of the operating leased asset exceeds its fair value and is not recoverable. The carrying amount of operating leased assets is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the lease payments and the estimated residual value upon the eventual disposition of the equipment. The following table summarizes lease receivables and investment in operating leases and their corresponding balance sheet location at September 30, 2020 and December 31, 2019: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Direct financing leases Lease receivables Loans and leases receivable $ 105,712 $ 91,762 Guaranteed residual assets Loans and leases receivable 6,723 7,435 Unguaranteed residual assets Loans and leases receivable 5,822 1,260 Deferred initial direct costs Loans and leases receivable 654 721 Unearned income Loans and leases receivable (11,709) (11,300) Net investment in direct financing leases $ 107,202 $ 89,878 Operating leases Investment in operating leases Other assets $ 119,271 $ 107,850 Accumulated depreciation Other assets (24,973) (14,251) Deferred initial direct costs Other assets 1,070 1,052 Net investment in operating leases 95,368 94,651 Total lease assets $ 202,570 $ 184,529 COVID-19 Impact on Leases Customers granted concessions to lessees as a result of the business impact of the COVID-19 pandemic. At September 30, 2020, the book value of finance and operating leases with payment deferments were $31.0 million and $16.0 million, respectively. The concessions did not have a material impact in interest income from leases for the three months and nine months ended September 30, 2020. Additionally, Customers did not receive any concessions on its operating leases in which Customers is the lessee.
Leases	LEASES Lessee Customers has operating leases for its branches, LPOs, and administrative offices, with remaining lease terms ranging between 2 month and 7 years. These operating leases comprise substantially all of Customers' obligations in which Customers is the lessee. Most lease agreements consist of initial lease terms ranging between 1 and 5 years, with options to renew the leases or extend the term up to 15 years at Customers' sole discretion. Some operating leases include variable lease payments that are based on an index or rate, such as the CPI. Variable lease payments are not included in the liability or right of use asset and are recognized in the period in which the obligation for those payments are incurred. Customers' operating lease agreements do not contain any material residual value guarantees or material restrictive covenants. Pursuant to these agreements, Customers does not have any commitments that would meet the definition of a finance lease. As most of Customers' operating leases do not provide an implicit rate, Customers utilized its incremental borrowing rate based on the information available at either the adoption of ASC 842 or the commencement date of the lease, whichever was later, when determining the present value of lease payments. The following table summarizes operating lease ROU assets and operating lease liabilities and their corresponding balance sheet location: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Operating lease ROU assets Other assets $ 18,419 $ 20,232 LIABILITIES Operating lease liabilities Other liabilities $ 19,813 $ 21,358 The following table summarizes operating lease cost and its corresponding income statement location for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Classification 2020 2019 2020 2019 Operating lease cost (1) Occupancy expenses $ 1,643 $ 1,470 $ 4,597 $ 4,400 (1) There were no variable lease costs for the three and nine months ended September 30, 2020 and 2019, and sublease income for operating leases is immaterial. Maturities of non-cancelable operating lease liabilities were as follows at September 30, 2020: (amounts in thousands) September 30, 2020 2020 $ 2,610 2021 5,134 2022 4,653 2023 3,759 2024 2,673 Thereafter 3,026 Total minimum payments 21,855 Less: interest 2,042 Present value of lease liabilities $ 19,813 Customers does not have leases where it is involved with the construction or design of an underlying asset. Customers has no legally binding minimum lease payments for leases signed but not yet commenced as of September 30, 2020. Cash paid pursuant to the operating lease liability was $1.4 million and $4.4 million for the three and nine months ended September 30, 2020, respectively. Cash paid pursuant to the operating lease liability was $1.4 million and $4.2 million for the three and nine months ended September 30, 2019, respectively. These payments were reported as cash flows used in operating activities in the statement of cash flows. The following table summarizes the weighted average remaining lease term and discount rate for Customers' operating leases at September 30, 2020 and December 31, 2019: (amounts in thousands) September 30, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 4.6 years 5.0 years Weighted average discount rate Operating leases 2.69 % 2.90 % Equipment Lessor CCF is a wholly-owned subsidiary of Customers Bank and is referred to as the Equipment Finance Group. CCF is primarily focused on originating equipment operating and direct finance equipment leases for a broad range of asset classes. It services vendors, dealers, independent finance companies, bank-owned leasing companies and strategic direct customers in the plastics, packaging, machine tool, construction, transportation and franchise markets. Lease terms typically range from 24 months to 120 months. CCF offers the following lease products: Capital Lease, Purchase Upon Termination, TRAC, Split-TRAC, and FMV. Direct finance equipment leases are included in commercial and industrial loans and leases receivable. The estimated residual values for direct finance and operating leases are established by utilizing internally developed analyses, external studies, and/or third-party appraisals to establish a residual position. For the direct finance leases, only Customers' Split-TRAC leases have residual risk and the unguaranteed portions are typically nominal. Expected credit losses on direct financing leases and the related estimated residual values are included in the allowance for credit losses on loans and leases. Leased assets under operating leases are carried at amortized cost net of accumulated depreciation and any impairment charges and are presented in other assets. The depreciation expense of the leased assets is recognized on a straight-line basis over the contractual term of the leases up to the expected residual value. The expected residual value and, accordingly, the monthly depreciation expense, may change throughout the term of the lease. Operating lease rental income for leased assets is recognized in commercial lease income on a straight-line basis over the lease term. Customers periodically reviews its operating leased assets for impairment. An impairment loss is recognized if the carrying amount of the operating leased asset exceeds its fair value and is not recoverable. The carrying amount of operating leased assets is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the lease payments and the estimated residual value upon the eventual disposition of the equipment. The following table summarizes lease receivables and investment in operating leases and their corresponding balance sheet location at September 30, 2020 and December 31, 2019: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Direct financing leases Lease receivables Loans and leases receivable $ 105,712 $ 91,762 Guaranteed residual assets Loans and leases receivable 6,723 7,435 Unguaranteed residual assets Loans and leases receivable 5,822 1,260 Deferred initial direct costs Loans and leases receivable 654 721 Unearned income Loans and leases receivable (11,709) (11,300) Net investment in direct financing leases $ 107,202 $ 89,878 Operating leases Investment in operating leases Other assets $ 119,271 $ 107,850 Accumulated depreciation Other assets (24,973) (14,251) Deferred initial direct costs Other assets 1,070 1,052 Net investment in operating leases 95,368 94,651 Total lease assets $ 202,570 $ 184,529 COVID-19 Impact on Leases Customers granted concessions to lessees as a result of the business impact of the COVID-19 pandemic. At September 30, 2020, the book value of finance and operating leases with payment deferments were $31.0 million and $16.0 million, respectively. The concessions did not have a material impact in interest income from leases for the three months and nine months ended September 30, 2020. Additionally, Customers did not receive any concessions on its operating leases in which Customers is the lessee.
Leases	LEASES Lessee Customers has operating leases for its branches, LPOs, and administrative offices, with remaining lease terms ranging between 2 month and 7 years. These operating leases comprise substantially all of Customers' obligations in which Customers is the lessee. Most lease agreements consist of initial lease terms ranging between 1 and 5 years, with options to renew the leases or extend the term up to 15 years at Customers' sole discretion. Some operating leases include variable lease payments that are based on an index or rate, such as the CPI. Variable lease payments are not included in the liability or right of use asset and are recognized in the period in which the obligation for those payments are incurred. Customers' operating lease agreements do not contain any material residual value guarantees or material restrictive covenants. Pursuant to these agreements, Customers does not have any commitments that would meet the definition of a finance lease. As most of Customers' operating leases do not provide an implicit rate, Customers utilized its incremental borrowing rate based on the information available at either the adoption of ASC 842 or the commencement date of the lease, whichever was later, when determining the present value of lease payments. The following table summarizes operating lease ROU assets and operating lease liabilities and their corresponding balance sheet location: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Operating lease ROU assets Other assets $ 18,419 $ 20,232 LIABILITIES Operating lease liabilities Other liabilities $ 19,813 $ 21,358 The following table summarizes operating lease cost and its corresponding income statement location for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Classification 2020 2019 2020 2019 Operating lease cost (1) Occupancy expenses $ 1,643 $ 1,470 $ 4,597 $ 4,400 (1) There were no variable lease costs for the three and nine months ended September 30, 2020 and 2019, and sublease income for operating leases is immaterial. Maturities of non-cancelable operating lease liabilities were as follows at September 30, 2020: (amounts in thousands) September 30, 2020 2020 $ 2,610 2021 5,134 2022 4,653 2023 3,759 2024 2,673 Thereafter 3,026 Total minimum payments 21,855 Less: interest 2,042 Present value of lease liabilities $ 19,813 Customers does not have leases where it is involved with the construction or design of an underlying asset. Customers has no legally binding minimum lease payments for leases signed but not yet commenced as of September 30, 2020. Cash paid pursuant to the operating lease liability was $1.4 million and $4.4 million for the three and nine months ended September 30, 2020, respectively. Cash paid pursuant to the operating lease liability was $1.4 million and $4.2 million for the three and nine months ended September 30, 2019, respectively. These payments were reported as cash flows used in operating activities in the statement of cash flows. The following table summarizes the weighted average remaining lease term and discount rate for Customers' operating leases at September 30, 2020 and December 31, 2019: (amounts in thousands) September 30, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 4.6 years 5.0 years Weighted average discount rate Operating leases 2.69 % 2.90 % Equipment Lessor CCF is a wholly-owned subsidiary of Customers Bank and is referred to as the Equipment Finance Group. CCF is primarily focused on originating equipment operating and direct finance equipment leases for a broad range of asset classes. It services vendors, dealers, independent finance companies, bank-owned leasing companies and strategic direct customers in the plastics, packaging, machine tool, construction, transportation and franchise markets. Lease terms typically range from 24 months to 120 months. CCF offers the following lease products: Capital Lease, Purchase Upon Termination, TRAC, Split-TRAC, and FMV. Direct finance equipment leases are included in commercial and industrial loans and leases receivable. The estimated residual values for direct finance and operating leases are established by utilizing internally developed analyses, external studies, and/or third-party appraisals to establish a residual position. For the direct finance leases, only Customers' Split-TRAC leases have residual risk and the unguaranteed portions are typically nominal. Expected credit losses on direct financing leases and the related estimated residual values are included in the allowance for credit losses on loans and leases. Leased assets under operating leases are carried at amortized cost net of accumulated depreciation and any impairment charges and are presented in other assets. The depreciation expense of the leased assets is recognized on a straight-line basis over the contractual term of the leases up to the expected residual value. The expected residual value and, accordingly, the monthly depreciation expense, may change throughout the term of the lease. Operating lease rental income for leased assets is recognized in commercial lease income on a straight-line basis over the lease term. Customers periodically reviews its operating leased assets for impairment. An impairment loss is recognized if the carrying amount of the operating leased asset exceeds its fair value and is not recoverable. The carrying amount of operating leased assets is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the lease payments and the estimated residual value upon the eventual disposition of the equipment. The following table summarizes lease receivables and investment in operating leases and their corresponding balance sheet location at September 30, 2020 and December 31, 2019: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Direct financing leases Lease receivables Loans and leases receivable $ 105,712 $ 91,762 Guaranteed residual assets Loans and leases receivable 6,723 7,435 Unguaranteed residual assets Loans and leases receivable 5,822 1,260 Deferred initial direct costs Loans and leases receivable 654 721 Unearned income Loans and leases receivable (11,709) (11,300) Net investment in direct financing leases $ 107,202 $ 89,878 Operating leases Investment in operating leases Other assets $ 119,271 $ 107,850 Accumulated depreciation Other assets (24,973) (14,251) Deferred initial direct costs Other assets 1,070 1,052 Net investment in operating leases 95,368 94,651 Total lease assets $ 202,570 $ 184,529 COVID-19 Impact on Leases Customers granted concessions to lessees as a result of the business impact of the COVID-19 pandemic. At September 30, 2020, the book value of finance and operating leases with payment deferments were $31.0 million and $16.0 million, respectively. The concessions did not have a material impact in interest income from leases for the three months and nine months ended September 30, 2020. Additionally, Customers did not receive any concessions on its operating leases in which Customers is the lessee.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Borrowings	BORROWINGS Short-term debt Short-term debt at September 30, 2020 and December 31, 2019 was as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Amount Rate Amount Rate FHLB advances $ 850,000 1.24 % $ 500,000 2.15 % Federal funds purchased 680,000 0.14 % 538,000 1.60 % Total short-term debt $ 1,530,000 $ 1,038,000 The following is a summary of additional information relating to Customers' short-term debt: September 30, 2020 December 31, 2019 (dollars in thousands) FHLB advances Maximum outstanding at any month end $ 910,000 $ 1,190,150 Average balance during the period 796,286 793,304 Weighted-average interest rate during the period 2.17 % 2.66 % Federal funds purchased Maximum outstanding at any month end 842,000 600,000 Average balance during the period 279,299 271,400 Weighted-average interest rate during the period 0.20 % 2.28 % At September 30, 2020 and December 31, 2019, Customers Bank had aggregate availability under federal funds lines totaling $0.5 billion and $0.6 billion, respectively. Long-term debt FHLB and FRB advances Long-term FHLB and FRB advances at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Amount Rate Amount Rate FHLB advances $ — — % $ 350,000 2.36 % FRB PPP Liquidity Facility advances 4,811,009 0.35 % — — % Total long-term FHLB and FRB advances $ 4,811,009 $ 350,000 Beginning in second quarter 2020, Customers began participating in the PPPLF, in which Federal Reserve Banks extend non-recourse loans to institutions that are eligible to make PPP loans. Only PPP loans that are guaranteed by the SBA under the PPP, with respect to both principal and interest that are originated by an eligible institution, may be pledged as collateral to the Federal Reserve Banks. The maximum borrowing capacity with the FHLB and FRB at September 30, 2020 and December 31, 2019 was as follows: (amounts in thousands) September 30, 2020 December 31, 2019 Total maximum borrowing capacity with the FHLB $ 2,851,496 $ 3,445,416 Total maximum borrowing capacity with the FRB (1) 214,766 136,842 Qualifying loans serving as collateral against FHLB and FRB advances (1) 4,092,732 4,496,983 (1) Amounts reported in the above table exclude borrowings under the PPPLF, which are limited to the face value of the loans originated under the PPP. At September 30, 2020, Customers had $4.8 billion of borrowings under the PPPLF, with a borrowing capacity of up to $5.0 billion, which is the face value of the qualifying loans Customers has originated under the PPP. Senior and Subordinated Debt Long-term senior notes and subordinated debt at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Issued by Ranking Amount Amount Rate Issued Amount Date Issued Maturity Price Customers Bancorp Senior $ 24,522 $ 24,432 4.500 % $ 25,000 September 2019 September 2024 100.000 % Customers Bancorp Senior 99,413 99,198 3.950 % 100,000 June 2017 June 2022 99.775 % Total other borrowings 123,935 123,630 Customers Bancorp Subordinated (1)(2) 72,176 72,040 5.375 % 74,750 December 2019 December 2034 100.000 % Customers Bank Subordinated (1)(3) 109,148 109,075 6.125 % 110,000 June 2014 June 2029 100.000 % Total subordinated debt $ 181,324 $ 181,115 (1) The subordinated notes qualify as Tier 2 capital for regulatory capital purposes. (2) Customers Bancorp has the ability to call the subordinated notes, in whole, or in part, at a redemption price equal to 100% of the principal balance at certain times on or after December 30, 2029. (3) The subordinated notes will bear an annual fixed rate of 6.125% until June 26, 2024. From June 26, 2024 until maturity, the notes will bear an annual interest rate equal to the three-month LIBOR plus 344.3 basis points. Customers Bank has the ability to call the subordinated notes, in whole, or in part, at a redemption price equal to 100% of the principal balance at certain times on or after June 26, 2024.

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2020
Regulatory Capital [Abstract]
Regulatory Capital	REGULATORY CAPITAL The Bank and the Bancorp are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet the minimum capital requirements can result in certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on Customers' financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank and the Bancorp must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items, as calculated under the regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies. In first quarter 2020, U.S federal banking regulatory agencies permitted banking organizations to phase-in, for regulatory capital purposes, the day-one impact of the new CECL accounting rule on retained earnings over a period of three years. As part of its response to the impact of COVID-19, on March 31, 2020, the U.S. federal banking regulatory agencies issued an interim final rule that provided the option to temporarily delay certain effects of CECL on regulatory capital for two years, followed by a three-year transition period. The interim final rule allows banking organizations to delay for two years 100% of the day-one impact of adopting CECL and 25% of the cumulative change in the reported allowance for credit losses since adopting CECL. Customers has elected to adopt the interim final rule, which is reflected in the regulatory capital data presented below. In April 2020, the U.S. federal banking regulatory agencies issued an interim final rule that permits banks to exclude the impact of participating in the SBA PPP program in their regulatory capital ratios. Specifically, PPP loans are zero percent risk weighted and a bank can exclude all PPP loans pledged as collateral to the PPPLF from its average total consolidated assets for purposes of calculating the Tier 1 capital to average assets ratio (i.e. leverage ratio). Customers applied this regulatory guidance in the calculation of its regulatory capital ratios presented below. Quantitative measures established by regulation to ensure capital adequacy require the Bank and the Bancorp to maintain minimum amounts and ratios (set forth in the following table) of common equity Tier 1, Tier 1, and total capital to risk-weighted assets, and Tier 1 capital to average assets (as defined in the regulations). At September 30, 2020 and December 31, 2019, the Bank and the Bancorp satisfied all capital requirements to which they were subject. Generally, to comply with the regulatory definition of adequately capitalized, or well capitalized, respectively, or to comply with the Basel III capital requirements, an institution must at least maintain the common equity Tier 1, Tier 1 and total risk-based capital ratios and the Tier 1 leverage ratio in excess of the related minimum ratios as set forth in the following table: Minimum Capital Levels to be Classified as: Actual Adequately Capitalized Well Capitalized Basel III Compliant (amounts in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio As of September 30, 2020: Common equity Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 902,174 7.488 % $ 542,199 4.500 % N/A N/A $ 843,420 7.000 % Customers Bank $ 1,217,159 10.120 % $ 541,217 4.500 % $ 781,757 6.500 % $ 841,892 7.000 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,119,645 9.293 % $ 722,932 6.000 % N/A N/A $ 1,024,153 8.500 % Customers Bank $ 1,217,159 10.120 % $ 721,622 6.000 % $ 962,163 8.000 % $ 1,022,298 8.500 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,361,237 11.298 % $ 963,909 8.000 % N/A N/A $ 1,265,130 10.500 % Customers Bank $ 1,397,059 11.616 % $ 962,163 8.000 % $ 1,202,704 10.000 % $ 1,262,839 10.500 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 1,119,645 8.534 % $ 524,799 4.000 % N/A N/A $ 524,799 4.000 % Customers Bank $ 1,217,159 9.288 % $ 524,203 4.000 % $ 655,254 5.000 % $ 524,203 4.000 % As of December 31, 2019: Common equity Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 821,810 7.984 % $ 463,211 4.500 % N/A N/A $ 720,551 7.000 % Customers Bank $ 1,164,652 11.323 % $ 462,842 4.500 % $ 668,549 6.500 % $ 719,976 7.000 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,039,281 10.096 % $ 617,615 6.000 % N/A N/A $ 874,955 8.500 % Customers Bank $ 1,164,652 11.323 % $ 617,122 6.000 % $ 822,829 8.000 % $ 874,256 8.500 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,256,309 12.205 % $ 823,487 8.000 % N/A N/A $ 1,080,827 10.500 % Customers Bank $ 1,330,155 12.933 % $ 822,829 8.000 % $ 1,028,537 10.000 % $ 1,079,964 10.500 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 1,039,281 9.258 % $ 449,026 4.000 % N/A N/A $ 449,026 4.000 % Customers Bank $ 1,164,652 10.379 % $ 448,851 4.000 % $ 561,064 5.000 % $ 448,851 4.000 % The Basel III Capital Rules require that we maintain a 2.500% capital conservation buffer with respect to each of CET1, Tier 1 and total capital to risk-weighted assets, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. A financial institution with a conservation buffer of less than the required amount is subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers.

Disclosures About Fair Value of

Disclosures About Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Disclosures About Fair Value of Financial Instruments	DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS Customers uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. ASC Topic 825, Financial Instruments , requires disclosure of the estimated fair value of an entity’s assets and liabilities considered to be financial instruments. For Customers, as for most financial institutions, the majority of its assets and liabilities are considered to be financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and a willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under ASC 820, Fair Value Measurements and Disclosures , as explained below. In accordance with ASC 820, the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for Customers' various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The fair value guidance provides a consistent definition of fair value, focusing on an exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. The fair value guidance also establishes a fair value hierarchy and describes the following three levels used to classify fair value measurements. Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require adjustments to inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The following methods and assumptions were used to estimate the fair values of Customers' financial instruments as of September 30, 2020 and December 31, 2019: Financial Instruments Recorded at Fair Value on a Recurring Basis Investment securities: The fair values of equity securities, available for sale debt securities and debt securities reported at fair value based on a fair value option election are determined by obtaining quoted market prices on nationally recognized and foreign securities exchanges (Level 1), quoted prices in markets that are not active (Level 2), matrix pricing (Level 2), which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted prices, or internally and externally developed models that use unobservable inputs due to limited or no market activity of the instrument (Level 3). These assets are classified as Level 1, 2 or 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. Loans held for sale - Residential mortgage loans (fair value option): Customers generally estimates the fair values of residential mortgage loans held for sale based on commitments on hand from investors within the secondary market for loans with similar characteristics. These assets are classified as Level 2 fair values, based upon the lowest level of input that is significant to the fair value measurements. Loans receivable - Commercial mortgage warehouse loans (fair value option): The fair value of commercial mortgage warehouse loans is the amount of cash initially advanced to fund the mortgage, plus accrued interest and fees, as specified in the respective agreements. The loan is used by mortgage companies as short-term bridge financing between the funding of the mortgage loans and the finalization of the sale of the loans to an investor. Changes in fair value are not generally expected to be recognized because at inception of the transaction the underlying mortgage loans have already been sold to an approved investor. Additionally, the interest rate is variable, and the transaction is short-term, with an average life of under 30 days from purchase to sale. These assets are classified as Level 2 fair values, based upon the lowest level of input that is significant to the fair value measurements. Derivatives (assets and liabilities): The fair values of interest rate swaps, interest rate caps and credit derivatives are determined using models that incorporate readily observable market data into a market standard methodology. This methodology nets the discounted future cash receipts and the discounted expected cash payments. The discounted variable cash receipts and payments are based on expectations of future interest rates derived from observable market interest rate curves. In addition, fair value is adjusted for the effect of nonperformance risk by incorporating credit valuation adjustments for Customers and its counterparties. These assets and liabilities are classified as Level 2 fair values, based upon the lowest level of input that is significant to the fair value measurements. The fair values of the residential mortgage loan commitments are derived from the estimated fair values that can be generated when the underlying mortgage loan is sold in the secondary market. Customers generally uses commitments on hand from third party investors to estimate an exit price and adjusts for the probability of the commitment being exercised based on Customers' internal experience (i.e., pull-through rate). These assets and liabilities are classified as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. Derivative assets and liabilities are presented in "Other assets" and "Accrued interest payable and other liabilities" on the consolidated balance sheet. The following information should not be interpreted as an estimate of Customers' fair value in its entirety because fair value calculations are only provided for a limited portion of Customers' assets and liabilities. Due to a wide range of valuation techniques and the degree of subjectivity used in making these estimates, comparisons between Customers' disclosures and those of other companies may not be meaningful. Financial Instruments Recorded at Fair Value on a Nonrecurring Basis Collateral-dependent loans: Collateral-dependent loans are those loans that are accounted for under ASC 326, Financial Instruments - Credit Losses , in which the Bank has measured impairment generally based on the fair value of the loan’s collateral or discounted cash flow analysis. Fair value is generally determined based upon independent third-party appraisals of the properties that collateralize the loans, discounted cash flows based upon the expected proceeds, sales agreements or letters of intent with third parties. These assets are generally classified as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. Other real estate owned: The fair value of OREO is determined by using appraisals, which may be discounted based on management’s review and changes in market conditions or sales agreements with third parties. All appraisals must be performed in accordance with the Uniform Standards of Professional Appraisal Practice. Appraisals are certified to the Bank and performed by appraisers on the Bank’s approved list of appraisers. Evaluations are completed by a person independent of management. The content of the appraisal depends on the complexity of the property. Appraisals are completed on a “retail value” and an “as is value”. These assets are classified as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. The estimated fair values of Customers' financial instruments at September 30, 2020 and December 31, 2019 were as follows. Fair Value Measurements at September 30, 2020 (amounts in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets: Cash and cash equivalents $ 331,416 $ 331,416 $ 331,416 $ — $ — Debt securities, available for sale 1,131,365 1,131,365 — 1,131,365 — Equity securities 2,466 2,466 2,466 — — Loans held for sale 26,689 26,689 — 6,998 19,691 Total loans and leases receivable, net of allowance for credit losses on loans and leases 16,423,029 17,070,867 — 3,913,593 13,157,274 FHLB, Federal Reserve Bank and other restricted stock 70,387 70,387 — 70,387 — Derivatives 60,810 60,810 — 60,355 455 Liabilities: Deposits $ 10,839,077 $ 10,843,133 $ 9,866,651 $ 976,482 $ — FRB advances 4,811,009 4,811,009 — 4,811,009 — Federal funds purchased 680,000 680,000 680,000 — — FHLB advances 850,000 854,104 — 854,104 — Other borrowings 123,935 102,594 — 102,594 — Subordinated debt 181,324 178,958 — 178,958 — Derivatives 110,649 110,649 — 110,649 — Fair Value Measurements at December 31, 2019 (amounts in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets: Cash and cash equivalents $ 212,505 $ 212,505 $ 212,505 $ — $ — Debt securities, available for sale 577,198 577,198 — 577,198 — Interest-only GNMA securities 16,272 16,272 — — 16,272 Equity securities 2,406 2,406 2,406 — — Loans held for sale 486,328 486,328 — 2,130 484,198 Total loans and leases receivable, net of allowance for credit losses on loans and leases 9,508,367 9,853,037 — 2,245,758 7,607,279 FHLB, Federal Reserve Bank and other restricted stock 84,214 84,214 — 84,214 — Derivatives 23,608 23,608 — 23,529 79 Liabilities: Deposits $ 8,648,936 $ 8,652,340 $ 6,980,402 $ 1,671,938 $ — Federal funds purchased 538,000 538,000 538,000 — — FHLB advances 850,000 852,162 — 852,162 — Other borrowings 123,630 127,603 — 127,603 — Subordinated debt 181,115 192,217 — 192,217 — Derivatives 45,939 45,939 — 45,939 — For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 Fair Value Measurements at the End of the Reporting Period Using (amounts in thousands) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Measured at Fair Value on a Recurring Basis: Assets Available for sale debt securities: Asset-backed securities $ — $ 375,381 $ — $ 375,381 U.S. government agencies securities — 40,008 — 40,008 Agency-guaranteed residential mortgage-backed securities — $ 61,079 — $ 61,079 Agency guaranteed collateralized mortgage obligations — 153,779 — 153,779 State and political subdivision debt securities — 18,259 — 18,259 Private label collateralized mortgage obligations — 118,987 — 118,987 Corporate notes — 363,872 — 363,872 Equity securities 2,466 — — 2,466 Derivatives — 60,355 455 60,810 Loans held for sale – fair value option — 6,998 — 6,998 Loans receivable, mortgage warehouse – fair value option — 3,913,593 — 3,913,593 Total assets – recurring fair value measurements $ 2,466 $ 5,112,311 $ 455 $ 5,115,232 Liabilities Derivatives $ — $ 110,649 $ — $ 110,649 Measured at Fair Value on a Nonrecurring Basis: Assets Loans held for sale $ — $ — $ 18,366 $ 18,366 Collateral-dependent loans — — 22,539 22,539 Total assets – nonrecurring fair value measurements $ — $ — $ 40,905 $ 40,905 December 31, 2019 Fair Value Measurements at the End of the Reporting Period Using (amounts in thousands) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Measured at Fair Value on a Recurring Basis: Assets Available for sale debt securities: Agency-guaranteed residential mortgage–backed securities $ — $ 278,321 $ — $ 278,321 Corporate notes — 298,877 — 298,877 Interest-only GNMA securities — — 16,272 16,272 Equity securities 2,406 — — 2,406 Derivatives — 23,529 79 23,608 Loans held for sale – fair value option — 2,130 — 2,130 Loans receivable, mortgage warehouse – fair value option — 2,245,758 — 2,245,758 Total assets – recurring fair value measurements $ 2,406 $ 2,848,615 $ 16,351 $ 2,867,372 Liabilities Derivatives $ — $ 45,939 $ — $ 45,939 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of specific reserves of $852 $ — $ — $ 14,272 $ 14,272 Other real estate owned — — 78 78 Total assets – nonrecurring fair value measurements $ — $ — $ 14,350 $ 14,350 The changes in residential mortgage loan commitments (Level 3 assets) measured at fair value on a recurring basis for the three and nine months ended September 30, 2020 and 2019 are summarized in the tables below. Additional information about residential mortgage loan commitments can be found in NOTE 12 - DERIVATIVES INSTRUMENTS AND HEDGING ACTIVITIES. Residential Mortgage Loan Commitments Three Months Ended September 30, (amounts in thousands) 2020 2019 Balance at June 30 $ 52 $ 145 Issuances 455 150 Settlements (52) (145) Balance at September 30 $ 455 $ 150 Residential Mortgage Loan Commitments Nine Months Ended September 30, (amounts in thousands) 2020 2019 Balance at December 31 $ 79 $ 69 Issuances 722 372 Settlements (346) (291) Balance at September 30 $ 455 $ 150 There were no transfers between levels during the three and nine months ended September 30, 2020 and 2019. The following table summarizes financial assets and financial liabilities measured at fair value as of September 30, 2020 and December 31, 2019 on a recurring and nonrecurring basis for which Customers utilized Level 3 inputs to measure fair value. The unobservable Level 3 inputs noted below contain a level of uncertainty that may differ from what is realized in an immediate settlement of the assets. Therefore, Customers may realize a value higher or lower than the current estimated fair value of the assets. Quantitative Information about Level 3 Fair Value Measurements September 30, 2020 Fair Value Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Collateral-dependent loans – real estate $ 21,572 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% (8%) Collateral-dependent loans – commercial & industrial 967 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation adjustments (4) 7% - 8% (8%) 60% - 60% (60%) Residential mortgage loan commitments 455 Adjusted market bid Pull-through rate 81% - 81% (81%) (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. Customers does not generally discount appraisals. (2) Appraisals are adjusted by management for liquidation expenses. The range and weighted average of liquidation expense adjustments are presented as a percentage of the appraisal. (3) Business asset valuation obtained from independent party. (4) Business asset valuations may be adjusted by management for qualitative factors including economic conditions and the condition of the business assets. The range and weighted average of the business asset adjustments are presented as a percent of the business asset valuation. Quantitative Information about Level 3 Fair Value Measurements December 31, 2019 Fair Value Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans – real estate $ 12,767 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation (4) 8% - 10% (8%) 34% - 45% (37%) Impaired loans – commercial & industrial 1,505 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation adjustments (4) 8% - 8% (8%) 8% - 50% (22%) Interest-only GNMA securities 16,272 Discounted cash flow Constant prepayment rate 9% - 14% 12% Other real estate owned 78 Collateral appraisal (1) Liquidation expenses (2) 8% - 9% (9%) Residential mortgage loan commitments 79 Adjusted market bid Pull-through rate 85% - 85% (85%) (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. Customers does not generally discount appraisals. (2) Appraisals are adjusted by management for liquidation expenses. The range and weighted average of liquidation expense adjustments are presented as a percentage of the appraisal. (3) Business asset valuation obtained from independent party. (4) Business asset valuations may be adjusted by management for qualitative factors including economic conditions and the condition of the business assets. The range and weighted average of the business asset adjustments are presented as a percent of the business asset valuation.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Risk Management Objectives of Using Derivatives Customers is exposed to certain risks arising from both its business operations and economic conditions. Customers manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources, and durations of its assets and liabilities. Specifically, Customers enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the values of which are determined by interest rates. Customers’ derivative financial instruments are used to manage differences in the amount, timing, and duration of Customers’ known or expected cash receipts and its known or expected cash payments principally related to certain borrowings and deposits. Customers also has interest-rate derivatives resulting from a service provided to certain qualifying customers, and therefore, they are not used to manage Customers’ interest-rate risk in assets or liabilities. Customers manages a matched book with respect to its derivative instruments used in this customer service in order to minimize its net risk exposure resulting from such transactions. Cash Flow Hedges of Interest-Rate Risk Customers’ objectives in using interest-rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, Customers primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for Customers making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The changes in the fair value of derivatives designated and qualifying as cash flow hedges are recorded in accumulated other comprehensive income (loss) and subsequently reclassified into earnings in the period that the hedged item affects earnings. To date, such derivatives were used to hedge the variable cash flows associated with the forecasted issuances of debt and a certain variable-rate deposit relationship. Customers discontinues cash flow hedge accounting if it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in accumulated other comprehensive income (loss) are reclassified immediately into earnings and any subsequent changes in the fair value of such derivatives are recognized directly in earnings. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on Customers' variable-rate debt and a variable-rate deposit relationship. Customers expects to reclassify $15.9 million of losses from accumulated other comprehensive income (loss) to interest expense during the next 12 months. Customers is hedging its exposure to the variability in future cash flows for forecasted transactions (3-month FHLB advances and federal funds purchased) and a variable-rate deposit relationship over a maximum period of 67 months (excluding forecasted transactions related to the payment of variable interest on existing financial instruments). At September 30, 2020, Customers had five outstanding interest rate derivatives with notional amounts totaling $1.1 billion that were designated as cash flow hedges of interest-rate risk. At December 31, 2019, Customers had four outstanding interest rate derivatives with notional amounts totaling $725.0 million that were designated as cash flow hedges of interest rate-risk. The outstanding cash flow hedges at September 30, 2020 expire between June 2021 and May 2026. Derivatives Not Designated as Hedging Instruments Customers executes interest rate swaps (typically the loan customers will swap a floating-rate loan for a fixed-rate loan) and interest rate caps with commercial banking customers to facilitate their respective risk management strategies. The customer interest rate swaps and interest rate caps are simultaneously offset by interest rate swaps and interest rate caps that Customers executes with a third party in order to minimize interest-rate risk exposure resulting from such transactions. As the interest rate swaps and interest rate caps associated with this program do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and caps and the offsetting third-party market swaps and caps are recognized directly in earnings. At September 30, 2020, Customers had 154 interest rate swaps with an aggregate notional amount of $1.4 billion and six interest rate caps with an aggregated notional amount of $122.1 million related to this program. At December 31, 2019, Customers had 140 interest rate swaps with an aggregate notional amount of $1.4 billion and four interest rate caps with an aggregate notional amount of $78.6 million related to this program. Customers enters into residential mortgage loan commitments in connection with its consumer mortgage banking activities to fund mortgage loans at specified rates and times in the future. These commitments are short-term in nature and generally expire in 30 to 60 days. The residential mortgage loan commitments that relate to the origination of mortgage loans that will be held for sale are considered derivative instruments under applicable accounting guidance and are reported at fair value, with changes in fair value recorded directly in earnings. At September 30, 2020 and December 31, 2019, Customers had an outstanding notional balance of residential mortgage loan commitments of $19.4 million and $4.5 million, respectively. Customers has also purchased and sold credit derivatives to either hedge or participate in the performance risk associated with some of its counterparties. These derivatives are not designated as hedging instruments and are reported at fair value, with changes in fair value reported directly in earnings. At September 30, 2020 and December 31, 2019, Customers had outstanding notional balances of credit derivatives of $172.9 million and $167.1 million, respectively. Fair Value of Derivative Instruments on the Balance Sheet The following tables present the fair value of Customers' derivative financial instruments as well as their presentation on the balance sheet as of September 30, 2020 and December 31, 2019. September 30, 2020 Derivative Assets Derivative Liabilities (amounts in thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 46,785 Total $ — $ 46,785 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 59,962 Other liabilities $ 63,340 Interest rate caps Other assets 9 Other liabilities 9 Credit contracts Other assets 384 Other liabilities 515 Residential mortgage loan commitments Other assets 455 Other liabilities — Total $ 60,810 $ 63,864 December 31, 2019 Derivative Assets Derivative Liabilities (amounts in thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 21,374 Total $ — $ 21,374 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 23,301 Other liabilities $ 24,797 Interest rate caps Other assets 9 Other liabilities 9 Credit contracts Other assets 219 Other liabilities (241) Residential mortgage loan commitments Other assets 79 Other liabilities — Total $ 23,608 $ 24,565 Effect of Derivative Instruments on Net Income The following tables present amounts included in the consolidated statements of income related to derivatives not designated as hedges for the three and nine months ended September 30, 2020 and 2019. Amount of Income (Loss) Recognized in Earnings Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Income Statement Location 2020 2019 2020 2019 Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 387 $ (35) $ (6,191) $ 63 Interest rate caps Other non-interest income — — — — Credit contracts Other non-interest income 162 85 1,436 228 Residential mortgage loan commitments Mortgage banking income 403 5 376 82 Total $ 952 $ 55 $ (4,379) $ 373 Effect of Derivative Instruments on Comprehensive Income The following table presents the effect of Customers' derivative financial instruments on comprehensive income for the three and nine months ended September 30, 2020 and 2019. Amount of Gain (Loss) Recognized in OCI on Derivatives (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Three Months Ended September 30, Three Months Ended (amounts in thousands) 2020 2019 2020 2019 Derivatives in cash flow hedging relationships: Interest rate swaps $ 429 $ (3,821) Interest expense $ (4,400) $ (764) Amount of Gain (Loss) Recognized in OCI on Derivatives (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Nine Months Ended September 30, Nine Months Ended (amounts in thousands) 2020 2019 2020 2019 Derivatives in cash flow hedging relationships: Interest rate swaps $ (24,602) $ (19,391) Interest expense $ (8,596) $ (355) (1) Amounts presented are net of taxes. See NOTE 4 - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) for the total effect on other comprehensive income (loss) from derivatives designated as cash flow hedges for the periods presented. Credit-risk-related Contingent Features By entering into derivative contracts, Customers is exposed to credit risk. The credit risk associated with derivatives executed with customers is the same as that involved in extending the related loans and is subject to the same standard credit policies. To mitigate the credit-risk exposure to major derivative dealer counterparties, Customers only enters into agreements with those counterparties that maintain credit ratings of high quality. Agreements with major derivative dealer counterparties contain provisions whereby default on any of Customers' indebtedness would be considered a default on its derivative obligations. Customers also has entered into agreements that contain provisions under which the counterparty could require Customers to settle its obligations if Customers fails to maintain its status as a well/adequately capitalized institution. As of September 30, 2020, the fair value of derivatives in a net liability position (which includes accrued interest but excludes any adjustment for nonperformance-risk) related to these agreements was $114.5 million. In addition, Customers, which has collateral posting thresholds with certain of these counterparties, had posted $110.0 million of cash as collateral at September 30, 2020. Customers records cash posted as collateral as a reduction in the outstanding balance of cash and cash equivalents and an increase in the balance of other assets. Disclosures about Offsetting Assets and Liabilities The following tables present derivative instruments that are subject to enforceable master netting arrangements. Customers' interest rate swaps and interest rate caps with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps and interest rate caps with commercial banking customers and residential mortgage loan commitments are not subject to master netting arrangements and are excluded from the table below. Customers has not made a policy election to offset its derivative positions. Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount September 30, 2020 Interest rate derivative assets with institutional counterparties $ — $ — $ — $ — Interest rate derivative liabilities with institutional counterparties $ 110,039 $ — $ (110,039) $ — Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount December 31, 2019 Interest rate derivative assets with institutional counterparties $ 432 $ — $ — $ 432 Interest rate derivative liabilities with institutional counterparties $ 45,727 $ — $ (45,727) $ —

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS Customers’ segment financial reporting reflects the manner in which its chief operating decision makers allocate resources and assess performance. Management has determined that Customers’ operations consist of two reportable segments - Customers Bank Business Banking and BankMobile. Each segment generates revenues, manages risk, and offers distinct products and services to targeted customers through different delivery channels. The strategy, marketing and analysis of these segments vary considerably. The Customers Bank Business Banking segment is delivered predominately to commercial customers in Southeastern Pennsylvania, New York, New Jersey, Massachusetts, Rhode Island, New Hampshire, Washington, D.C., and Illinois through a single-point-of-contact business model and provides liquidity to residential mortgage originators nationwide through commercial loans to mortgage companies. Lending and deposit gathering activities are focused primarily on privately held businesses, high-net-worth families, selected commercial real estate lending, commercial mortgage companies, and equipment finance. Revenues are generated primarily through net interest income (the difference between interest earned on loans and leases, investments, and other interest earning assets and interest paid on deposits and other borrowed funds) and other non-interest income, such as mortgage warehouse transactional fees and BOLI. The BankMobile segment provides state-of-the-art high-tech digital banking and disbursement services to consumers, students, and the "under banked" nationwide, along with "Banking as a Service" offerings with white label partners. BankMobile is a full-service fintech banking platform that is accessible to customers anywhere and anytime through the customer's smartphone or other web-enabled device. Revenues are currently being generated primarily through interest income on consumer installment loans, interchange and card revenue, deposit and wire transfer fees and university fees. The majority of expenses for BankMobile are related to the segment's operation of the ongoing business acquired through the Disbursement business acquisition and costs associated with the development of white label products for its partners. The following tables present the operating results for Customers' reportable business segments for the three and nine months ended September 30, 2020 and 2019. The segment financial results include directly attributable revenues and expenses. Consistent with the presentation of segment results to Customers' chief operating decision makers, overhead costs and preferred stock dividends are assigned to the Customers Bank Business Banking segment. The tax benefit assigned to BankMobile was based on an estimated effective tax rate of 20.61% for 2020 and 23.15% for 2019, respectively. Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 126,648 $ 13,002 $ 139,650 $ 113,995 $ 12,723 $ 126,718 Interest expense 31,718 493 32,211 50,734 249 50,983 Net interest income 94,930 12,509 107,439 63,261 12,474 75,735 Provision for credit losses on loans and leases 8,699 4,256 12,955 2,475 1,951 4,426 Non-interest income 21,603 12,190 33,793 11,757 11,612 23,369 Non-interest expense 48,926 16,635 65,561 38,347 21,245 59,592 Income (loss) before income tax expense (benefit) 58,908 3,808 62,716 34,196 890 35,086 Income tax expense (benefit) 11,374 827 12,201 7,814 206 8,020 Net income (loss) 47,534 2,981 50,515 26,382 684 27,066 Preferred stock dividends 3,430 — 3,430 3,615 — 3,615 Net income (loss) available to common shareholders $ 44,104 $ 2,981 $ 47,085 $ 22,767 $ 684 $ 23,451 (1) Amounts reported include funds transfer pricing of $2.2 million and $0.3 million, for the three months ended September 30, 2020 and 2019, respectively, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the use of excess low/no cost deposits. Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 351,819 $ 38,393 $ 390,212 $ 309,882 $ 29,863 $ 339,745 Interest expense 108,251 1,219 109,470 139,402 625 140,027 Net interest income 243,568 37,174 280,742 170,480 29,238 199,718 Provision for credit losses on loans and leases 55,620 10,068 65,688 3,245 11,294 14,539 Non-interest income 44,422 33,537 77,959 20,304 34,821 55,125 Non-interest expense 137,055 58,470 195,525 111,840 61,320 173,160 Income (loss) before income tax expense (benefit) 95,315 2,173 97,488 75,699 (8,555) 67,144 Income tax expense (benefit) 20,708 448 21,156 17,324 (1,981) 15,343 Net income (loss) 74,607 1,725 76,332 58,375 (6,574) 51,801 Preferred stock dividends 10,626 — 10,626 10,844 — 10,844 Net income (loss) available to common shareholders $ 63,981 $ 1,725 $ 65,706 $ 47,531 $ (6,574) $ 40,957 As of September 30, 2020 and 2019 Goodwill and other intangibles $ 3,629 $ 10,808 $ 14,437 $ 3,629 $ 11,892 $ 15,521 Total assets (2) $ 18,203,784 $ 574,943 $ 18,778,727 $ 11,131,914 $ 591,876 $ 11,723,790 Total deposits $ 9,895,328 $ 943,749 $ 10,839,077 $ 8,260,080 $ 665,605 $ 8,925,685 Total non-deposit liabilities (2) $ 6,853,184 $ 34,975 $ 6,888,159 $ 1,747,846 $ 31,109 $ 1,778,955 (1) Amounts reported include funds transfer pricing of $5.3 million and $8.1 million, for the nine months ended September 30, 2020 and 2019, respectively, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the use of excess low/no cost deposits. (2) Amounts reported exclude inter-segment receivables/payables.

Non-Interest Revenues

Non-Interest Revenues	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Non-Interest Revenues	NON-INTEREST REVENUES Customers' revenue from contracts with customers in scope of ASC 606 is recognized within non-interest income. The following table presents Customers' non-interest revenues affected by ASC 606 by business segment for the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue (1) $ (3,148) $ 7,229 $ 4,081 $ 181 $ 6,688 $ 6,869 Deposit fees 651 2,788 3,439 457 3,185 3,642 University fees - card and disbursement fees — 310 310 — 262 262 Total revenue recognized at point in time (2,497) 10,327 7,830 638 10,135 10,773 Revenue recognized over time: University fees - subscription revenue — 1,039 1,039 — 1,006 1,006 Total revenue recognized over time — 1,039 1,039 — 1,006 1,006 Total revenue from contracts with customers $ (2,497) $ 11,366 $ 8,869 $ 638 $ 11,141 $ 11,779 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue (1) $ (2,685) $ 20,053 $ 17,368 $ 580 $ 21,855 $ 22,435 Deposit fees 1,704 8,517 10,221 1,190 8,009 9,199 University fees - card and disbursement fees — 990 990 — 783 783 Total revenue recognized at point in time (981) 29,560 28,579 1,770 30,647 32,417 Revenue recognized over time: University fees - subscription revenue — 3,038 3,038 — 2,953 2,953 Total revenue recognized over time — 3,038 3,038 — 2,953 2,953 Total revenue from contracts with customers $ (981) $ 32,598 $ 31,617 $ 1,770 $ 33,600 $ 35,370 (1) Beginning on July 1, 2020, Customers Bank became subject to the Federal Reserve's regulation limits on interchange fees for banks over $10 billion in assets. Customers Bank Business Banking has agreed to pay BankMobile the difference between the regulated and unregulated interchange rates. For the three and nine months ended September 30, 2020, BankMobile received $3.2 million for the difference between the regulated and unregulated interchange rates.

Loss Contingencies

Loss Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss Contingencies	LOSS CONTINGENCIES Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are any such matters that will have a material effect on the consolidated financial statements that are not currently accrued for. However, in light of the uncertainties inherent in these matters, it is possible that the ultimate resolution may have a material adverse effect on Customers’ results of operations for a particular period, and future changes in circumstances or additional information could result in accruals or resolution in excess of established accruals, which could adversely affect Customers’ results of operations, potentially materially. Lifestyle Healthcare Group, Inc. Matter On January 9, 2017, Lifestyle Healthcare Group, Inc., et al (“Plaintiffs”) filed a Complaint captioned Lifestyle Healthcare Group, Inc.; Fred Rappaport; Victoria Rappaport; Lifestyle Management Group, LLC Trading as Lifestyle Real Estate I, LP; Lifestyle Real Estate I GP, LLC; Daniel Muck; Lifestyle Management Group, LLC; Lifestyle Management Group, LLC Trading as Lifestyle I, LP D/B/A Lifestyle Medspa, Plaintiffs (“Lifestyle Parties”) v. Customers Bank, Robert White; Saldutti Law, LLC a/k/a Saldutti Law Group; Robert L. Saldutti, Esquire; and Michael Fuoco, Civil Action No. 01206, in the First Judicial District of Pennsylvania, Court of Common Pleas of Philadelphia . In this Complaint, the Plaintiffs generally allege wrongful use of civil proceedings and abuse of process in connection with a case filed and later dismissed in federal court, titled, Customers Bank v. Fred Rappaport, et al., U.S.D.C.E.D. Pa., No. 15-6145. On January 30, 2017, Customers Bank filed Preliminary Objections to the Complaint seeking dismissal of Plaintiff’s claims against Customers Bank and Robert White, named as co-defendants. In response to the Preliminary Objections, Lifestyle filed an Amended Complaint against Customers Bank and Robert White. Customers Bank filed Preliminary Objections to the Second Amended Complaint seeking dismissal of Plaintiff's claim against Customers Bank and Robert White, named as co-defendants. The Court dismissed certain counts and determined to allow certain other counts to proceed. On September 17, 2020, a Stipulation of Dismissal with Prejudice was filed with the Court as a result of the voluntary resolution of the matter by and between Plaintiffs and defendants, Customers Bank, Robert White and Michael Fuoco only. United States Department of Education Matter In third quarter 2018, Customers received a Final Program Review Determination ("FPRD") letter dated September 5, 2018 from the ED regarding a focused program review of Higher One's/Customers Bank's administration, as a third party servicer, of the programs authorized pursuant to Title IV of the Higher Education Act of 1965. The ED program review covered the award years beginning in 2013 through the FPRD issuance date, including the time period when Higher One was acting as the third party servicer prior to Customers' acquisition of the Disbursement business on June 15, 2016. The FPRD determined that, with respect to students enrolled at specified partner institutions, Higher One/Customers did not provide convenient fee-free access to ATMs or bank branch offices in such locations as required by the ED’s cash management regulations. Those regulations, which were in effect during the period covered by the program review and were revised during that period, seek, among other purposes, to ensure that students can make fee-free cash withdrawals. The FPRD determined that students incurred prohibited costs in accessing Title IV credit balance funds, and the FPRD classifies those costs as financial liabilities of Customers. The FPRD also requires Customers to take prospective action to increase ATM access for students at certain of its partner institutions. Customers disagreed with the FPRD and appealed the asserted financial liabilities of $6.5 million, and a request for review has been submitted to trigger an administrative process before the ED’s Office of Hearing and Appeals. On March 26, 2020, the ED and Customers filed a Joint Motion to Dismiss with Prejudice (the "Joint Motion") with the United States Department of Education. The Joint Motion states that the ED and Customers reached an agreement that resolves the liabilities at issue in the appeal. The Joint Motion was granted on April 27, 2020. As part of the settlement, the liabilities assessed in the FPRD were reduced to $3.0 million (the "settlement amount"). Customers had previously recorded a liability in the amount of $1.0 million during third quarter 2019 and increased its liability by an additional $1.0 million in first quarter 2020. The remaining $1.0 million is expected to be funded from funds in an escrow account set-up at the time of Customers' acquisition of the Disbursement business from Higher One in 2016. Bureau of the Fiscal Service Notice of Direct Debit (U.S. Treasury Check Reclamation) On June 21, 2019, Customers received a Notice of Direct Debit (U.S. Treasury Check Reclamation) from the Bureau of the Fiscal Service (“Reclamation Notice”). The Reclamation Notice represented a demand to Customers for the return of funds on a U.S. Treasury check for approximately $5.4 million. Customers filed a written protest pursuant to Code of Federal Regulations, Title 31, Chapter II, Part 240, which resulted in a suspension of the direct debit by the Bureau of the Fiscal Service. On January 31, 2020, Customers received an Abandonment Notice from the Bureau of Fiscal Service instructing Customers to disregard the Notice of Direct Debit as the Bureau of Fiscal Service would not be seeking reclamation of these funds.

Bankmobile Technologies, Inc. M

Bankmobile Technologies, Inc. Merger	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Bankmobile Technologies, Inc. Merger	BANKMOBILE TECHNOLOGIES, INC. MERGER On August 6, 2020, Customers Bank, BMT, a subsidiary of Customers Bank, and MFAC, a special purpose acquisition company, entered into a definitive merger agreement. BMT is the technology arm of Customers' BankMobile reporting segment. Upon closing of the transaction, the combined company will operate as BM Technologies and expects to be listed on the New York Stock Exchange. All BMT serviced deposits and loans will remain at the Bank immediately after the closing of the transaction. Upon the closing of the transaction, BM Technologies will be a financial technology company bringing banks and business partners together through its digital banking platform. Merger Consideration The aggregate consideration to be paid in connection with the merger will be an amount (the “Merger Consideration”) equal to: (i) $140.0 million minus (ii) $9.3 million (representing a sponsor equity adjustment), plus (or minus, if negative) (iii) BMT’s net working capital less a target net working capital of $10.0 million, minus (iv) the aggregate amount of any outstanding indebtedness of BMT at closing, and minus (v) the amount of any unpaid transaction expenses of BMT, MFAC’s transaction expenses and other liabilities of MFAC due and owing at the closing of the transaction. The Merger Consideration will consist of cash and stock. The cash portion of the Merger Consideration (“Cash Consideration”) will be equal to (i) the amount of any proceeds of the PIPE Investment; plus (ii) an amount equal to one-half (1/2) of the difference between the (A) cash and cash equivalents of MFAC, including any funds in the trust account after giving effect to the completion of the redemption of shares of MFAC’s public stockholders (“Redemption”), less (B) a cash reserve to be used for the benefit of BM Technologies in the Merger, in the amount of $10.0 million (such difference between clause (A) and (B) which resulting amount if otherwise negative shall be equal to zero, being which resulting amount if otherwise negative shall be equal to zero, being the “Remaining Trust Account Amount”); minus (iii) MFAC’s transaction expenses and other liabilities of MFAC due and owing at the Business Combination Closing; plus (iv) the cash and cash equivalents of BMT; minus (v) BMT’s unpaid transaction expenses; minus (vi) a cash reserve in the amount of $5.0 million. The stock portion of the Merger Consideration consists of a number of shares of MFAC’s Class A common stock with an aggregate value (the “Merger Consideration Share Amount”) equal to (a) the Merger Consideration, minus (b) the Cash Consideration, with Customers Bancorp's stockholders receiving a number of shares of MFAC Class A common stock equal to the Merger Consideration Share Amount, divided by $10.38 (the “Per Share Price”). The Merger Consideration is subject to adjustment after the closing date based on confirmed amounts of the net working capital of BMT, the outstanding indebtedness of BMT and any unpaid transaction expenses of BMT, as of the closing date. The adjustment amount shall be the Merger Consideration as finally determined minus the estimated Merger Consideration that was issued at the closing date of the transaction. If the adjustment is a negative adjustment in favor of MFAC, the Bank will pay MFAC the absolute value of the adjustment amount in cash. If the adjustment is a positive adjustment in favor of BMT, MFAC will issue to the Bank an additional number of shares of Class A Common Stock of MFAC with a value equal to the adjustment amount (with each share valued at the per share price). The Merger Consideration is also subject to reduction for the indemnification obligations of the Bank. Certain Relationships Mr. Jay Sidhu, who currently serves as Chief Executive Officer and Chairman of the Board of Customers Bancorp and Executive Chairman of the Bank, also serves as a director of MFAC, is one of the managing members of MFAC’s sponsor and is a MFAC stockholder and also served as Executive Chairman of MFAC through August 7, 2020. Mr. Bhanu Choudhrie, who currently serves as a member of the board of directors of Customers Bancorp and the Bank also serves as a director of MFAC, is one of the managing members of MFAC’s sponsor and is a MFAC stockholder. Mr. Samvir Sidhu, the son of Jay Sidhu, currently serves as the Bank’s Vice Chairman and Chief Operating Officer and as Customers Bancorp’s Head of Corporate Development, previously served as the Chief Executive Officer of MFAC, currently serves as a director of MFAC and is a MFAC stockholder. Ms. Luvleen Sidhu, the daughter of Jay Sidhu, currently serves as the Chief Executive Officer and as a director of BMT and is expected to continue to serve in those roles with BM Technologies. Certain of these individuals also expect to participate in the private placement by MFAC of shares of its Class A common stock to be completed in connection with the closing. In light of these relationships, Customers Bancorp appointed a special committee consisting of independent directors with their own counsel and financial advisors. The special committee reviewed the transaction, obtained a fairness opinion in connection with the transaction, and made a unanimous recommendation to Customers Bancorp’s board of directors for approval. Customers Bancorp’s board of directors approved the transaction by a majority vote, with the above-mentioned directors recusing themselves from the deliberation and voting process and no director voting against the transaction. Amendment to the Merger Agreement On November 2, 2020, the Bank, BMT and MFAC amended the merger agreement to provide, among other things, that the stock portion of the Merger Consideration will be distributed to Customers Bancorp's stockholders at the closing of the transaction and that there will be restrictions on the sale of these shares for twelve months after the closing of the merger, provided that these restrictions will end prior to such time upon the earlier of (1) the date after the closing date on which MFAC consummates a liquidation, merger, capital stock exchange, reorganization or other similar transaction with an unaffiliated third-party that results in all of MFAC’s stockholders having the right to exchange their shares of common stock for cash, securities or other property, and (2) the date on which the closing sale price of MFAC’s common stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations and recapitalizations and the like) for any 20 trading days within any 30 trading day period commencing at least 150 days after the closing date. The merger is expected to close in the fourth quarter 2020, pending MFAC stockholders' approval, regulatory approval and the satisfaction or waiver of additional conditions to closing. As of September 30, 2020, BMT had an outstanding borrowing with the Bank totalling $40 million. All or a portion of this borrowing is expected to remain outstanding after the merger transaction. As of September 30, 2020, Customers has determined that the planned divestiture of BMT through this merger transaction did not qualify for reporting as a discontinued operation. BMT, as a component of the BankMobile segment, did not meet the criteria to be classified as held for sale as the merger transaction is subject to MFAC shareholders' approval, regulatory approval, and other required conditions to closing as discussed above. Accordingly, Customers continues to report the operating results of BMT within the BankMobile segment. See NOTE 13 - BUSINESS SEGMENTS.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS[placeholder]

Significant Accounting Polici_2

Significant Accounting Policies and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The interim unaudited consolidated financial statements have been prepared in conformity with U.S. GAAP and pursuant to the rules and regulations of the SEC. These interim unaudited consolidated financial statements reflect all normal and recurring adjustments that are, in the opinion of management, necessary to present a fair statement of the financial position and the results of operations and cash flows of Customers Bancorp and subsidiaries for the interim periods presented. Certain information and footnote disclosures normally included in the annual consolidated financial statements have been omitted from these interim unaudited consolidated financial statements as permitted by SEC rules and regulations. The December 31, 2019 consolidated balance sheet presented in this report has been derived from Customers Bancorp’s audited 2019 consolidated financial statements. Management believes that the disclosures are adequate to present fairly the consolidated financial statements as of the dates and for the periods presented. These interim unaudited consolidated financial statements should be read in conjunction with the 2019 consolidated financial statements of Customers Bancorp and subsidiaries included in Customers' Annual Report on Form 10-K for the year ended December 31, 2019 filed with the SEC on March 2, 2020 (the "2019 Form 10-K"). The 2019 Form 10-K describes Customers Bancorp’s significant accounting policies, which include its policies on Principles of Consolidation; Cash and Cash Equivalents and Statements of Cash Flows; Restrictions on Cash and Amounts due from Banks; Business Combinations; Investment Securities; Loan Accounting Framework; Loans Held for Sale and Loans at Fair Value; Loans Receivable - Mortgage Warehouse, at Fair Value; Loans and Leases Receivable; Purchased Loans; ALLL; Goodwill and Other Intangible Assets; FHLB, Federal Reserve Bank, and Other Restricted Stock; OREO; BOLI; Bank Premises and Equipment; Lessor Operating Leases; Treasury Stock; Income Taxes; Share-Based Compensation; Transfer of Financial Assets; Segment Information; Derivative Instruments and Hedging; Comprehensive Income (Loss); EPS; Loss Contingencies; and Collaborative Arrangements. There have been no material changes to Customers Bancorp's significant accounting policies noted above for the three and nine months ended September 30, 2020, except for the adoption of ASU 2016-13 Financial Instruments - Credit Losses ("ASC 326"): Measurement of Credit Losses on Financial Instruments, which is discussed below in Adoption of New Accounting Standard, and replaces our prior ALLL policy.
Recently Issued Accounting Standards	New Accounting Standards Presented below are recently issued accounting standards that Customers has adopted as well as those that the FASB has issued but are not yet effective. Accounting Standards Adopted in 2020 Allowance for Credit Losses On January 1, 2020, Customers adopted ASC 326, which replaced the incurred loss methodology with an expected loss methodology that is referred to as the CECL methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and net investments in leases recognized by Customers as a lessor in accordance with ASC 842. CECL also applies to off-balance sheet credit exposures not accounted for as insurance, such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments. ASC 326 also made changes to the accounting for AFS debt securities, which now requires credit losses to be presented as an allowance, rather than as a write-down on AFS debt securities that management does not intend to sell or believes that it is more likely than not they will not be required to sell. ASC 326 Allowance for Credit Losses on Loans and Leases The allowance for credit losses on loans and leases is a valuation account that is deducted from the loan or lease’s amortized cost basis to present the net amount expected to be collected on the loans and leases. Loans and leases deemed to be uncollectible are charged against the allowance for credit losses on loans and leases, and subsequent recoveries, if any, are credited to the allowance for credit losses on loans and leases. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Changes to the allowance for credit losses on loans and leases are recorded through the provision for credit losses on loans and leases. The allowance for credit losses on loans and leases is maintained at a level considered appropriate to absorb expected credit losses over the expected life of the portfolio as of the reporting date. The allowance for credit losses on loans and leases is measured on a collective (pool) basis when similar risk characteristics exist. Customers' loan portfolio segments include commercial and consumer. Each of these two loan portfolio segments is comprised of multiple loan classes. Loan classes are characterized by similarities in loan type, collateral type, risk attributes and the manner in which credit risk is assessed and monitored. The commercial segment is composed of multi-family, commercial and industrial, commercial real estate owner occupied, commercial real estate non-owner occupied and construction loan classes. The consumer segment is composed of residential real estate, manufactured housing and installment. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. For individually assessed loans, see related details in the Individually Assessed Loans section below. The allowance for credit losses on collectively assessed loans and leases is measured over the expected life of the loan or lease using lifetime loss rate models which consider historical loan performance, loan or borrower attributes and forecasts of future economic conditions in addition to information about past events and current conditions. Significant loan/borrower attributes utilized in the models include origination date, maturity date, collateral property type, internal risk rating, delinquency status, borrower state and FICO score at origination. Customers uses external sources in the creation of its forecasts, including current economic conditions and forecasts for macroeconomic variables over its reasonable and supportable forecast period (e.g., GDP growth rate, unemployment rate, BBB spread, commercial real estate and home price indices). After the reasonable and supportable forecast period, which ranges from two to five years, the models revert the forecasted macroeconomic variables to their historical long-term trends, without specific predictions for the economy, over the expected life of the pool. The lifetime loss rate models also incorporate prepayment assumptions into estimated lifetime loss rates. Customers runs the CECL impairment models on a quarterly basis and qualitatively adjusts model results for risk factors that are not considered within the models but which are relevant in assessing the expected credit losses within the loan and lease pools. Management generally considers the following qualitative factors: • Volume and severity of past-due loans, non-accrual loans and classified loans; • Lending policies and procedures, including underwriting standards and historically based loss/collection, charge-off and recovery practices; • Nature and volume of the portfolio; • Existence and effect of any credit concentrations and changes in the level of such concentrations; • Risk ratings; • The value of the underlying collateral for loans that are not collateral dependent; • Changes in the quality of the loan review system; • Experience, ability and depth of lending management and staff; • Other external factors, such as changes in legal, regulatory or competitive environment; and • Model and data limitations. Customers has elected to not estimate an allowance for credit losses on accrued interest receivable, as it already has a policy in place to reverse or write-off accrued interest, through interest income, in a timely manner. Accrued interest receivable is presented as a separate financial statement line item in the consolidated balance sheet. Purchased Credit Deteriorated (“PCD”) Loans and Leases PCD assets are acquired individual loans and leases (or acquired groups of loans and leases with similar risk characteristics) that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by an acquirer’s assessment. PCD loans and leases are recorded at their purchase price plus the allowance for credit losses expected at the time of acquisition, or “gross up” of the amortized cost basis. The January 1, 2020 transition adjustment discussed above was established for these loans and leases without affecting the income statement or retained earnings. Changes in the current estimate of the allowance for credit losses after acquisition from the estimated allowance previously recorded are reported in the income statement as provision for credit losses expense or reversal of provision for credit losses in subsequent periods as they arise. Purchased loans or leases that do not qualify as PCD assets are accounted for similar to originated assets, whereby an allowance for credit losses is recognized with a corresponding increase to the income statement provision for credit losses. Evidence that purchased loans and leases, measured at amortized cost, have more-than-insignificant deterioration in credit quality since origination and, therefore meet the PCD definition, may include loans and leases that are past-due, in non-accrual status, poor borrower credit score, recent loan-to-value percentages and other standard indicators (i.e., TDR, charge-offs, bankruptcy). Allowance for Credit Losses on Lending-Related Commitments Customers estimates expected credit losses over the contractual period in which it is exposed to credit risk on contractual obligations to extend credit, unless the obligation is unconditionally cancellable by Customers. The allowance for credit losses on lending-related commitments is recorded in accrued interest payable and other liabilities in the consolidated balance sheet and is recorded as a provision for credit losses within other non-interest expense in the consolidated income statement. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over their estimated lives. Customers estimates the expected credit losses for undrawn commitments using a usage given default calculation. The lifetime loss rates for off-balance sheet credit exposures are calculated in the same manner as on-balance sheet credit exposures, using the same models and economic forecasts, adjusted for the estimated likelihood that funding will occur. Individually Assessed Loans and Leases ASC 326 provides that a loan or lease is measured individually if it does not share similar risk characteristics with other financial assets. For Customers, loans and leases which are identified to be individually assessed under CECL typically would have been evaluated individually as impaired loans using accounting guidance in effect in periods prior to the adoption of CECL and include TDRs and collateral dependent loans. TDRs A loan for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties is considered to be a TDR. The allowance for credit loss on a TDR is measured using the same method as all other loans held for investment, except in cases when the value of a concession cannot be measured using a method other than the DCF method. When the value of a concession is measured using the DCF method, the allowance for credit loss is determined by discounting the expected future cash flows at the original effective interest rate of the loan. The CARES Act and certain regulatory agencies recently issued guidance stating certain loan modifications to borrowers experiencing financial distress as a result of the economic impacts created by COVID-19 may not be required to be treated as TDRs under U.S GAAP. For COVID-19 related loan modifications which met the loan modification criteria under either the CARES Act or the criteria specified by the regulatory agencies, Customers elected to suspend TDR accounting for such loan modifications. Collateral Dependent Loans Customers considers a loan to be collateral dependent when foreclosure of the underlying collateral is probable. Customers has also elected to apply the practical expedient to measure expected credit losses of a collateral dependent asset using the fair value of the collateral, less any estimated costs to sell, when foreclosure is not probable but repayment of the loan is expected to be provided substantially through the operation or sale of the collateral, and the borrower is experiencing financial difficulty. Allowance for Credit Losses on Available for Sale Securities For AFS debt securities in an unrealized loss position, Customers first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, Customers evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on AFS securities is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on AFS securities is recognized in other comprehensive income. Changes in the allowance for credit losses on AFS securities are recorded as provision, or reversal of provision for credit losses on AFS securities in other non-interest income within the consolidated income statement. Losses are charged against the allowance for credit losses on AFS securities when management believes the uncollectibility of an AFS security is confirmed or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS debt securities totaled $4.2 million at September 30, 2020 and is excluded from the estimate of credit losses. Other Accounting Standards Adopted in 2020 Standard Summary of guidance Effects on Financial Statements ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Issued April 2019 • Clarifies the scope of the credit losses standard and addresses issues related to accrued interest receivable balances, recoveries, variable interest rates, and prepayments. • Addresses partial-term fair value hedges, fair value hedge basis adjustments and certain transition requirements. • Addresses recognizing and measuring financial instruments, specifically the requirement for remeasurement under ASC 820 when using the measurement alternative, certain disclosure requirements and which equity securities have to be remeasured at historical exchange rates. • Topic 326 Amendments - Effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. Topic 815 Amendments - Effective for first annual period beginning after the issuance date of this ASU (i.e., fiscal year 2020). Entities that have already adopted the amendments in ASU 2017-12 may elect either to retrospectively apply all the amendments or to prospectively apply all amendments as of the date of adoption. Topic 825 Amendments - Effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. • Customers adopted on January 1, 2020. • The adoption of this guidance relating to Topics 815 and 825 did not have a material impact on Customers' financial condition, results of operations and consolidated financial statements. Please refer to ASU 2016-13 for further discussion on Customers' adoption of ASU 2016-13 (Topic 326). ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606 Issued November 2018 • Clarifies that certain transactions between collaborative arrangement participants should be accounted for as revenue under Topic 606 when the collaborative arrangement participant is a customer in the context of a unit of account. In those situations, all the guidance in Topic 606 should be applied, including recognition, measurement, presentation, and disclosure requirements. • Adds unit-of-account guidance in Topic 808 to align with the guidance in Topic 606 when an entity is assessing whether the collaborative arrangement or a part of the arrangement is within scope of Topic 606. • Requires that in a transaction with a collaborative arrangement participant that is not directly related to sales to third parties, presenting the transaction together with revenue recognized under Topic 606 is precluded if the collaborative arrangement participant is not a customer. • Effective for fiscal year beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. • Customers adopted on January 1, 2020. • The adoption of this guidance did not have a material impact on Customers' financial condition, results of operations and consolidated financial statements. Other Accounting Standards Adopted in 2020 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2018-15, Internal-Use Software (Subtopic 350-40): Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract Issued August 2018 • Clarifies that service contracts with hosting arrangements must follow internal-use software guidance Subtopic 350-40 when determining which implementation costs to capitalize as an asset related to the service contract and which costs to expense. • Customers adopted on January 1, 2020. Accounting Standards Issued But Not Yet Adopted Standard Summary of guidance Effects on Financial Statements ASU 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting Issued March 2020 • Provides optional guidance for a limited period of time to ease the potential burden in accounting for (or derecognizing the effects of) reference rate reform on financial reporting. Specifically, the amendments provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. These relate only to those contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. • Effective as of March 12, 2020 and can be adopted anytime during the period of January 1, 2020 through December 31, 2022. • Customers intends to adopt this guidance during adoption period and is currently evaluating the expected impact of this ASU on its financial condition, results of operations and consolidated financial statements.
Fair Value Measurement	Customers uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. ASC Topic 825, Financial Instruments , requires disclosure of the estimated fair value of an entity’s assets and liabilities considered to be financial instruments. For Customers, as for most financial institutions, the majority of its assets and liabilities are considered to be financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and a willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under ASC 820, Fair Value Measurements and Disclosures , as explained below. In accordance with ASC 820, the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for Customers' various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The fair value guidance provides a consistent definition of fair value, focusing on an exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. The fair value guidance also establishes a fair value hierarchy and describes the following three levels used to classify fair value measurements. Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require adjustments to inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Derivatives	Risk Management Objectives of Using Derivatives Customers is exposed to certain risks arising from both its business operations and economic conditions. Customers manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources, and durations of its assets and liabilities. Specifically, Customers enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the values of which are determined by interest rates. Customers’ derivative financial instruments are used to manage differences in the amount, timing, and duration of Customers’ known or expected cash receipts and its known or expected cash payments principally related to certain borrowings and deposits. Customers also has interest-rate derivatives resulting from a service provided to certain qualifying customers, and therefore, they are not used to manage Customers’ interest-rate risk in assets or liabilities. Customers manages a matched book with respect to its derivative instruments used in this customer service in order to minimize its net risk exposure resulting from such transactions. Cash Flow Hedges of Interest-Rate Risk Customers’ objectives in using interest-rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, Customers primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for Customers making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The changes in the fair value of derivatives designated and qualifying as cash flow hedges are recorded in accumulated other comprehensive income (loss) and subsequently reclassified into earnings in the period that the hedged item affects earnings. To date, such derivatives were used to hedge the variable cash flows associated with the forecasted issuances of debt and a certain variable-rate deposit relationship. Customers discontinues cash flow hedge accounting if it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in accumulated other comprehensive income (loss) are reclassified immediately into earnings and any subsequent changes in the fair value of such derivatives are recognized directly in earnings.

Significant Accounting Polici_3

Significant Accounting Policies and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table illustrates the impact of adopting ASC 326: (amounts in thousands) Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported Under Assets Loans receivable, mortgage warehouse, at fair value $ 2,245,758 $ — $ 2,245,758 Loans and leases receivable Multi-family 1,907,331 7 1,907,338 Commercial and industrial 1,891,152 3 1,891,155 Commercial real estate owner occupied 551,948 100 552,048 Commercial real estate non-owner occupied 1,222,772 41 1,222,813 Construction 117,617 — 117,617 Total commercial loans and leases receivable 5,690,820 151 5,690,971 Residential real estate 382,634 32 382,666 Manufactured housing 71,359 37 71,396 Installment 1,174,175 12 1,174,187 Total consumer loans receivable 1,628,168 81 1,628,249 Loans and leases receivable 7,318,988 232 7,319,220 Allowance for credit losses on loans and leases (56,379) (79,829) (136,208) Total loans and leases receivable, net of allowance for credit losses on loans and leases 9,508,367 (79,596) 9,428,771 Liabilities Allowance for credit losses on lending-related commitments 49 3,388 3,437 Net deferred tax (asset) liability 11,740 (21,510) (9,770) Equity Retained earnings $ 381,519 $ (61,475) $ 320,044

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Components of Earnings (Loss) Per Share	The following are the components and results of Customers' earnings (loss) per common share calculations for the periods presented. Three Months Ended Nine Months Ended (amounts in thousands, except share and per share data) 2020 2019 2020 2019 Net income available to common shareholders $ 47,085 $ 23,451 $ 65,706 $ 40,957 Weighted-average number of common shares outstanding – basic 31,517,504 31,223,777 31,462,284 31,142,400 Share-based compensation plans 218,807 420,951 203,743 438,629 Weighted-average number of common shares – diluted 31,736,311 31,644,728 31,666,027 31,581,029 Basic earnings (loss) per common share $ 1.49 $ 0.75 $ 2.09 $ 1.32 Diluted earnings (loss) per common share $ 1.48 $ 0.74 $ 2.07 $ 1.30
Anti-dilutive Securities Excluded from Computation of Earnings Per Share	The following are securities that could potentially dilute basic earnings per common share in future periods that were not included in the computation of diluted earnings per common share because either the performance conditions for certain of the share-based compensation awards have not been met or to do so would have been anti-dilutive for the periods presented. Three Months Ended Nine Months Ended 2020 2019 2020 2019 Share-based compensation awards 862,417 2,181,195 862,417 2,233,160

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	The following tables present the changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2020 and 2019. All amounts are presented net of tax. Amounts in parentheses indicate reductions to AOCI. Three Months Ended September 30, 2020 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - June 30, 2020 $ 27,525 $ (37,490) $ (9,965) Unrealized gains (losses) arising during period, before tax (1,090) 580 (510) Income tax effect 283 (151) 132 Other comprehensive income (loss) before reclassifications (807) 429 (378) Reclassification adjustments for (gains) losses included in net income, before tax (11,707) 4,400 (7,307) Income tax effect 3,044 (1,145) 1,899 Amounts reclassified from accumulated other comprehensive income (loss) to net income (8,663) 3,255 (5,408) Net current-period other comprehensive income (loss) (9,470) 3,684 (5,786) Balance - September 30, 2020 $ 18,055 $ (33,806) $ (15,751) Nine Months Ended September 30, 2020 (amounts in thousands) Unrealized Gains (Losses) Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - December 31, 2019 $ 14,287 $ (15,537) $ (1,250) Unrealized gains (losses) arising during period, before tax 25,127 (33,486) (8,359) Income tax effect (6,533) 8,884 2,351 Other comprehensive income (loss) before reclassifications 18,594 (24,602) (6,008) Reclassification adjustments for (gains) losses included in net income, before tax (20,035) 8,596 (11,439) Income tax effect 5,209 (2,263) 2,946 Amounts reclassified from accumulated other comprehensive income (loss) to net income (14,826) 6,333 (8,493) Net current-period other comprehensive income (loss) 3,768 (18,269) (14,501) Balance - September 30, 2020 $ 18,055 $ (33,806) $ (15,751) (1) Reclassification amounts for available for sale debt securities are reported as gain or loss on sale of investment securities on the consolidated statements of income. (2) Reclassification amounts for cash flow hedges are reported as interest expense for the applicable hedged items on the consolidated statements of income. Three Months Ended September 30, 2019 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - June 30, 2019 $ 6,802 $ (16,795) $ (9,993) Unrealized gains (losses) arising during period, before tax 7,858 (5,163) 2,695 Income tax effect (2,043) 1,342 (701) Other comprehensive income (loss) before reclassifications 5,815 (3,821) 1,994 Reclassification adjustments for losses (gains) included in net income, before tax (1,001) 764 (237) Income tax effect 260 (198) 62 Amounts reclassified from accumulated other comprehensive income (loss) to net income (741) 566 (175) Net current-period other comprehensive income (loss) 5,074 (3,255) 1,819 Balance - September 30, 2019 $ 11,876 $ (20,050) $ (8,174) Nine Months Ended September 30, 2019 (amounts in thousands) Unrealized Gains (Losses) on Available for Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Total Balance - December 31, 2018 $ (21,741) $ (922) $ (22,663) Unrealized gains (losses) arising during period, before tax 46,430 (26,204) 20,226 Income tax effect (12,072) 6,813 (5,259) Other comprehensive income (loss) before reclassifications 34,358 (19,391) 14,967 Reclassification adjustments for losses (gains) included in net income, before tax (1,001) 355 (646) Income tax effect 260 (92) 168 Amounts reclassified from accumulated other comprehensive income (loss) to net income (741) 263 (478) Net current-period other comprehensive income 33,617 (19,128) 14,489 Balance - September 30, 2019 $ 11,876 $ (20,050) $ (8,174) (1) Reclassification amounts for available for sale debt securities are reported as gain or loss on sale of investment securities on the consolidated statements of income. (2) Reclassification amounts for cash flow hedges are reported as interest expense for the applicable hedged items on the consolidated statements of income.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Approximate Fair Value of Investment Securities	The amortized cost and fair value of investment securities as of September 30, 2020 and December 31, 2019 are summarized in the tables below: September 30, 2020 (1) (amounts in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale debt securities: Asset-backed securities $ 374,151 $ 1,404 $ (174) $ 375,381 U.S. government agencies securities 40,000 8 — 40,008 Agency-guaranteed residential mortgage-backed securities 59,013 2,066 — 61,079 Agency-guaranteed collateralized mortgage obligations 153,088 771 (80) 153,779 State and political subdivision debt securities (2) 17,391 868 — 18,259 Private label collateralized mortgage obligations 118,979 8 — 118,987 Corporate notes (3) 344,344 19,632 (104) 363,872 Available for sale debt securities $ 1,106,966 $ 24,757 $ (358) 1,131,365 Equity securities (5) 2,466 Total investment securities, at fair value $ 1,133,831 December 31, 2019 (amounts in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale debt securities: Agency-guaranteed residential mortgage-backed securities $ 273,252 $ 5,069 $ — $ 278,321 Corporate notes (3) 284,639 14,238 — 298,877 Available for sale debt securities $ 557,891 $ 19,307 $ — 577,198 Interest-only GNMA securities (4) 16,272 Equity securities (5) 2,406 Total investment securities, at fair value $ 595,876 (1) Accrued interest on AFS debt securities totaled $4.2 million at September 30, 2020 and is included in accrued interest receivable on the consolidated balance sheet. (2) Includes both taxable and non-taxable municipal securities. (3) Includes corporate securities issued by domestic bank holding companies. (4) Reported at fair value with fair value changes recorded in non-interest income based on a fair value option election. (5) Includes equity securities issued by a foreign entity.
Summary of Available-for-Sale Debt Securities by Stated Maturity	The following table shows debt securities by stated maturity. Debt securities backed by mortgages and other assets securities have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and, therefore, these debt securities are classified separately with no specific maturity date: September 30, 2020 (amounts in thousands) Amortized Fair Due in one year or less $ 8,000 $ 8,000 Due after one year through five years 83,209 84,275 Due after five years through ten years 274,135 292,605 Due after ten years 36,391 37,259 Asset-backed securities 374,151 375,381 Agency-guaranteed residential mortgage-backed securities 59,013 61,079 Agency-guaranteed collateralized mortgage obligations 153,088 153,779 Private label collateralized mortgage obligations 118,979 118,987 Total debt securities $ 1,106,966 $ 1,131,365
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	Gross unrealized losses and fair value of Customers' available for sale debt securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2020 were as follows: September 30, 2020 Less Than 12 Months 12 Months or More Total (amounts in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available for sale debt securities: Asset-backed securities $ 107,610 $ (174) $ — $ — $ 107,610 $ (174) Agency-guaranteed residential mortgage-backed securities 19,019 (80) — — 19,019 (80) Corporate notes 40,409 (104) — — 40,409 (104) Total $ 167,038 $ (358) $ — $ — $ 167,038 $ (358)

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables Held-for-sale [Abstract]
Composition of Loans Held for Sale	The composition of loans held for sale as of September 30, 2020 and December 31, 2019 was as follows: (amounts in thousands) September 30, 2020 December 31, 2019 Commercial loans: Multi-family loans, at lower of cost or fair value $ — $ 482,873 Commercial real estate non-owner occupied loans, at lower of cost or fair value 18,366 — Total commercial loans held for sale 18,366 482,873 Consumer loans: Home equity conversion mortgages, at lower of cost or fair value 1,325 1,325 Residential mortgage loans, at fair value 6,998 2,130 Total consumer loans held for sale 8,323 3,455 Loans held for sale $ 26,689 $ 486,328

Loans and Leases Receivable a_2

Loans and Leases Receivable and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Schedule of Loans and Leases Receivable	The following table presents loans and leases receivable as of September 30, 2020 and December 31, 2019. (amounts in thousands) September 30, 2020 December 31, 2019 Loans and leases receivable, mortgage warehouse, at fair value $ 3,913,593 $ 2,245,758 Loans receivable, PPP 4,964,105 — Loans receivable: Commercial: Multi-family 1,950,300 1,907,331 Commercial and industrial (1) 2,220,715 1,891,152 Commercial real estate owner occupied 557,595 551,948 Commercial real estate non-owner occupied 1,215,516 1,222,772 Construction 122,963 117,617 Total commercial loans and leases receivable 6,067,089 5,690,820 Consumer: Residential real estate 335,452 382,634 Manufactured housing 64,638 71,359 Installment 1,233,713 1,174,175 Total consumer loans receivable 1,633,803 1,628,168 Loans and leases receivable (2) 7,700,892 7,318,988 Allowance for credit losses (155,561) (56,379) Total loans and leases receivable, net of allowance for credit losses $ 16,423,029 $ 9,508,367 (1) Includes direct finance equipment leases of $106.5 million and $89.2 million at September 30, 2020 and December 31, 2019, respectively. (2) Includes deferred (fees) costs and unamortized (discounts) premiums, net of $(74.7) million and $2.1 million at September 30, 2020 and December 31, 2019, respectively.
Loans and Leases Receivable by Loan Type and Performance Status	The following tables summarize loans and leases receivable by loan and lease type and performance status as of September 30, 2020 and December 31, 2019: September 30, 2020 (amounts in thousands) 30-59 Days past due 60-89 Days past due 90 Days or more past due Total past due Loans and leases not past due (2) Total loans and leases (3) Multi-family $ — $ 15,446 $ 4,790 $ 20,236 $ 1,930,064 $ 1,950,300 Commercial and industrial — 2,072 7,695 9,767 2,210,948 2,220,715 Commercial real estate owner occupied — 952 2,436 3,388 554,207 557,595 Commercial real estate non-owner occupied — — 2,356 2,356 1,213,160 1,215,516 Construction — — — — 122,963 122,963 Residential real estate 436 3,160 6,327 9,923 325,529 335,452 Manufactured housing 784 608 4,463 5,855 58,783 64,638 Installment 5,468 4,609 3,098 13,175 1,220,538 1,233,713 Total $ 6,688 $ 26,847 $ 31,165 $ 64,700 $ 7,636,192 $ 7,700,892 December 31, 2019 (amounts in thousands) 30-89 Days past due (1) 90 Days or more past due (1) Total past due (1) Non-accrual Current (2) Purchased-credit-impaired loans (4) Total loans and leases (5) Multi-family $ 2,133 — $ 2,133 $ 4,117 $ 1,901,336 $ 1,688 $ 1,909,274 Commercial and industrial 2,395 — 2,395 4,531 1,882,700 354 1,889,980 Commercial real estate owner occupied 5,388 — 5,388 1,963 537,992 6,664 552,007 Commercial real estate non-owner occupied 8,034 — 8,034 76 1,211,892 3,527 1,223,529 Construction — — — — 118,418 — 118,418 Residential real estate 5,924 — 5,924 6,128 359,491 3,471 375,014 Manufactured housing 3,699 1,794 5,493 1,655 61,649 1,601 70,398 Installment 5,756 $ — 5,756 1,551 1,170,793 183 1,178,283 Total $ 33,329 $ 1,794 $ 35,123 $ 20,021 $ 7,244,271 $ 17,488 $ 7,316,903 (1) Includes past due loans and leases that are accruing interest because collection is considered probable. (2) Loans and leases where next payment due is less than 30 days from the report date. The September 30, 2020 table excludes PPP loans of $5.0 billion which are all current as of September 30, 2020. (3) Includes purchased credit deteriorated loans of $14.4 million at September 30, 2020. (4) Purchased-credit-impaired loans aggregated into a pool are accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows, and the past due status of the pools, or that of the individual loans within the pools, is not meaningful. Due to the credit impaired nature of the loans, the loans are recorded at a discount reflecting estimated future cash flows and the Bank recognizes interest income on each pool of loans reflecting the estimated yield and passage of time. Such loans are considered to be performing. Purchased-credit-impaired loans that are not in pools accrete interest when the timing and amount of their expected cash flows are reasonably estimable, and are reported as performing loans. (5) Amounts exclude deferred costs and fees and unamortized premiums and discounts.
Amortized cost of Loans and Leases on Nonaccrual Status	The following table presents the amortized cost of loans and leases on nonaccrual status. September 30, 2020 (1) December 31, 2019 (2) (amounts in thousands) Nonaccrual loans with no related allowance Nonaccrual loans with related allowance Total nonaccrual loans Nonaccrual loans with no related allowance Nonaccrual loans with related allowance Total nonaccrual loans Multi-family $ 8,749 $ 2,961 $ 11,710 $ 4,117 $ — $ 4,117 Commercial and industrial 8,749 884 9,633 3,083 1,448 4,531 Commercial real estate owner occupied 3,399 200 3,599 1,109 854 1,963 Commercial real estate non-owner occupied 2,408 — 2,408 76 — 76 Residential real estate 10,634 — 10,634 4,559 1,569 6,128 Manufactured housing — 2,778 2,778 — 1,655 1,655 Installment — 3,118 3,118 140 1,411 1,551 Total $ 33,939 $ 9,941 $ 43,880 $ 13,084 $ 6,937 $ 20,021 (1) Presented at amortized cost basis. (2) Amounts exclude deferred costs and fees and unamortized premiums and discounts.
Schedule of Allowance for Credit Losses on Loans and Leases	The changes in the allowance for credit losses on loans and leases for the three and nine months ended September 30, 2020 and 2019 are presented in the tables below. Three Months Ended September 30, 2020 Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (amounts in thousands) Ending Balance, $ 14,697 $ 12,302 $ 11,405 $ 26,493 $ 5,297 $ 4,550 $ 6,014 $ 79,147 $ 159,905 Charge-offs — (2,527) (44) (10,181) — — — (9,194) (21,946) Recoveries — 2,582 — 1,258 6 17 — 784 4,647 Provision for credit loss expense 329 569 (1,809) 2,630 1,120 82 (389) 10,423 12,955 Ending Balance, $ 15,026 $ 12,926 $ 9,552 $ 20,200 $ 6,423 $ 4,649 $ 5,625 $ 81,160 $ 155,561 Nine Months Ended Ending Balance, $ 6,157 $ 15,556 $ 2,235 $ 6,243 $ 1,262 $ 3,218 $ 1,060 $ 20,648 $ 56,379 Cumulative effect of change in accounting principle 2,171 759 5,773 7,918 (98) 1,518 3,802 57,986 79,829 Charge-offs — (2,645) (44) (25,779) — — — (23,744) (52,212) Recoveries — 2,661 5 1,258 122 72 — 1,759 5,877 Provision for loan and lease losses 6,698 (3,405) 1,583 30,560 5,137 (159) 763 24,511 65,688 Ending Balance, $ 15,026 $ 12,926 $ 9,552 $ 20,200 $ 6,423 $ 4,649 $ 5,625 $ 81,160 $ 155,561 Three Months Ended September 30, 2019 Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (amounts in thousands) Ending Balance, $ 9,926 $ 13,736 $ 3,360 $ 6,159 $ 649 $ 4,168 $ 123 $ 10,267 $ 48,388 Charge-offs — (349) (45) — — — — (1,806) (2,200) Recoveries — 369 10 — 8 5 — 47 439 Provision for loan and lease losses (2,428) 2,119 (435) 281 1 (90) 904 4,074 4,426 Ending Balance, $ 7,498 $ 15,875 $ 2,890 $ 6,440 $ 658 $ 4,083 $ 1,027 $ 12,582 $ 51,053 Nine Months Ended Ending Balance, $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 Charge-offs (541) (532) (119) — — (109) — (3,493) (4,794) Recoveries 7 826 235 — 128 20 — 120 1,336 Provision for loan and lease losses (3,430) 3,436 (546) 347 (94) 518 882 13,426 14,539 Ending Balance, $ 7,498 $ 15,875 $ 2,890 $ 6,440 $ 658 $ 4,083 $ 1,027 $ 12,582 $ 51,053
Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession	The following table presents loans modified in a TDR by type of concession for the three and nine months ended September 30, 2020 and 2019. There were no modifications that involved forgiveness of debt for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 (dollars in thousands) Number of loans Recorded investment Number of loans Recorded investment Number of loans Recorded investment Number of loans Recorded investment Extensions of maturity — $ — — $ — 6 $ 385 2 $ 514 Interest-rate reductions 2 88 7 196 34 1,461 19 628 Other (1) 65 1,385 — — 65 1,385 — — Total 67 $ 1,473 7 $ 196 105 $ 3,231 21 $ 1,142 (1) Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, or other concessions.
Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment Within Twelve Months	The following table presents, by loan type, the number of loans modified in TDRs and the related recorded investment, for which there was a payment default within twelve months following the modification: September 30, 2020 September 30, 2019 (dollars in thousands) Number of loans Recorded investment Number of loans Recorded investment Manufactured housing 5 $ 201 3 $ 76 Commercial real estate owner occupied 1 952 — — Residential real estate 1 95 1 82 Installment 8 $ 126 — $ — Total loans 15 $ 1,374 4 $ 158
Credit Ratings of Covered and Non-Covered Loan Portfolio	The following tables present the credit ratings of loans and leases receivable as of September 30, 2020 and December 31, 2019. PPP loans are excluded in the tables below as these loans are fully guaranteed by the SBA. Term Loans Amortized Cost Basis by Origination Year (in thousands) 2020 2019 2018 2017 2016 Prior Revolving loans amortized cost basis Revolving loans converted to term Total Multi-family loans: Pass $ 139,734 $ 23,396 $ 305,351 $ 626,402 $ 271,981 $ 485,023 $ — $ — $ 1,851,887 Special mention — — — 22,430 10,424 26,836 — — 59,690 Substandard — — — 17,859 13,799 7,065 — — 38,723 Doubtful — — — — — — — — — Total multi-family loans $ 139,734 $ 23,396 $ 305,351 $ 666,691 $ 296,204 $ 518,924 $ — $ — $ 1,950,300 Commercial and industrial loans and leases: Pass $ 564,313 $ 418,961 $ 153,659 $ 118,548 $ 48,470 $ 81,179 $ 739,151 $ — $ 2,124,281 Special mention 13,200 1,193 222 14,739 112 15,348 1,315 — 46,129 Substandard 6,421 9,037 14,343 1,611 8,084 2,925 7,884 — 50,305 Doubtful — — — — — — — — — Total commercial and industrial loans and leases $ 583,934 $ 429,191 $ 168,224 $ 134,898 $ 56,666 $ 99,452 $ 748,350 $ — $ 2,220,715 Commercial real estate owner occupied loans: Pass $ 46,303 $ 185,921 $ 88,291 $ 71,438 $ 48,202 $ 93,679 $ 741 $ — $ 534,575 Special mention — — 478 9,260 — 245 — — 9,983 Substandard — — — 347 2,243 10,447 — — 13,037 Doubtful — — — — — — — — — Total commercial real estate owner occupied loans $ 46,303 $ 185,921 $ 88,769 $ 81,045 $ 50,445 $ 104,371 $ 741 $ — $ 557,595 Commercial real estate non-owner occupied: Pass $ 135,589 $ 113,247 $ 116,794 $ 225,952 $ 197,116 $ 346,107 $ — $ — $ 1,134,805 Special mention — — — — — 10,559 — — 10,559 Substandard — — — 20,611 2,419 47,122 — — 70,152 Doubtful — — — — — — — — — Total commercial real estate non-owner occupied loans $ 135,589 $ 113,247 $ 116,794 $ 246,563 $ 199,535 $ 403,788 $ — $ — $ 1,215,516 Construction: Pass $ 8,679 $ 98,231 $ 4,571 $ — $ 9,768 $ — $ 1,714 $ — $ 122,963 Special mention — — — — — — — — — Substandard — — — — — — — — — Doubtful — — — — — — — — — Total construction loans $ 8,679 $ 98,231 $ 4,571 $ — $ 9,768 $ — $ 1,714 $ — $ 122,963 Total commercial loans and leases receivable $ 914,239 $ 849,986 $ 683,709 $ 1,129,197 $ 612,618 $ 1,126,535 $ 750,805 $ — $ 6,067,089 Residential real estate loans: Performing $ 7,514 $ 15,252 $ 7,647 $ 12,246 $ 42,883 $ 78,365 $ 161,575 $ — $ 325,482 Non-performing — — 160 785 1,350 4,395 3,280 — 9,970 Total residential real estate loans $ 7,514 $ 15,252 $ 7,807 $ 13,031 $ 44,233 $ 82,760 $ 164,855 $ — $ 335,452 Manufactured housing loans: Performing $ — $ 307 $ 632 $ 79 $ 42 $ 59,193 $ — $ — $ 60,253 Non-performing — — — — — 4,385 — — 4,385 Total manufactured housing loans $ — $ 307 $ 632 $ 79 $ 42 $ 63,578 $ — $ — $ 64,638 Installment loans: Performing $ 318,780 $ 790,192 $ 115,024 $ 4,726 $ 513 $ 1,201 $ — $ — $ 1,230,436 Non-performing 305 2,326 485 41 2 118 — — 3,277 Total installment loans $ 319,085 $ 792,518 $ 115,509 $ 4,767 $ 515 $ 1,319 $ — $ — $ 1,233,713 Total consumer loans $ 326,599 $ 808,077 $ 123,948 $ 17,877 $ 44,790 $ 147,657 $ 164,855 $ — $ 1,633,803 Loans and leases receivable $ 1,240,838 $ 1,658,063 $ 807,657 $ 1,147,074 $ 657,408 $ 1,274,192 $ 915,660 $ — $ 7,700,892 December 31, 2019 (amounts in thousands) Multi-family Commercial and industrial Commercial real estate owner occupied Commercial real estate non-owner occupied Construction Residential real estate Manufactured housing Installment Total (3) Pass/Satisfactory $ 1,816,200 $ 1,841,074 $ 536,777 $ 1,129,838 $ 118,418 $ — $ — $ — $ 5,442,307 Special Mention 69,637 26,285 8,286 6,949 — — — — 111,157 Substandard 23,437 22,621 6,944 86,742 — — — — 139,744 Performing (1) — — — — — 362,962 63,250 1,170,976 1,597,188 Non-performing (2) — — — — — 12,052 7,148 7,307 26,507 Total $ 1,909,274 $ 1,889,980 $ 552,007 $ 1,223,529 $ 118,418 $ 375,014 $ 70,398 $ 1,178,283 $ 7,316,903 (1) Includes residential real estate, manufactured housing, and installment loans not assigned internal ratings. (2) Includes residential real estate, manufactured housing, and installment loans that are past due and still accruing interest or on nonaccrual status. (3) Excludes commercial mortgage warehouse loans reported at fair value.
Schedule of Loan Purchases and Sales	Purchases and sales of loans were as follows for the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) 2020 2019 2020 2019 Purchases (1) Residential real estate $ — $ — $ 495 $ 105,858 Installment (2) 15,700 83,898 225,468 534,150 Total $ 15,700 $ 83,898 $ 225,963 $ 640,008 Sales (3) Commercial and industrial $ 3,968 $ — $ 3,968 $ — Commercial real estate non-owner occupied $ 17,600 $ — $ 17,600 $ — Installment — — 1,822 — Total $ 21,568 $ — $ 23,390 $ — (1) Amounts reported in the above table are the unpaid principal balance at time of purchase. The purchase price was 98.1% and 96.3% of loans outstanding for the three months ended September 30, 2020 and 2019, respectively. The purchase price was 100.2% and 99.4% of loans outstanding for the nine months ended September 30, 2020 and 2019, respectively. (2) Installment loan purchases for the three and nine months ended September 30, 2020 and 2019 consist of third-party originated unsecured consumer loans. None of the loans are considered sub-prime at the time of origination. Customers considers sub-prime borrowers to be those with FICO scores below 660. (3) Amounts reported in the above table are the unpaid principal balance at time of sale. There were no loan sales in the three and nine months ended September 30, 2019.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lessee, Summary of Right-of-Use Assets and Lease Liabilities	The following table summarizes operating lease ROU assets and operating lease liabilities and their corresponding balance sheet location: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Operating lease ROU assets Other assets $ 18,419 $ 20,232 LIABILITIES Operating lease liabilities Other liabilities $ 19,813 $ 21,358
Lease, Cost	The following table summarizes operating lease cost and its corresponding income statement location for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Classification 2020 2019 2020 2019 Operating lease cost (1) Occupancy expenses $ 1,643 $ 1,470 $ 4,597 $ 4,400 (1) There were no variable lease costs for the three and nine months ended September 30, 2020 and 2019, and sublease income for operating leases is immaterial.
Maturities of Non-cancelable Operating Lease Liabilities	Maturities of non-cancelable operating lease liabilities were as follows at September 30, 2020: (amounts in thousands) September 30, 2020 2020 $ 2,610 2021 5,134 2022 4,653 2023 3,759 2024 2,673 Thereafter 3,026 Total minimum payments 21,855 Less: interest 2,042 Present value of lease liabilities $ 19,813
Summary of Lease Term and Discount Rate for Operating Leases	The following table summarizes the weighted average remaining lease term and discount rate for Customers' operating leases at September 30, 2020 and December 31, 2019: (amounts in thousands) September 30, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 4.6 years 5.0 years Weighted average discount rate Operating leases 2.69 % 2.90 %
Lessor, Lease Receivables and Investment in Operating Leases and their Corresponding Balance Sheet Location	The following table summarizes lease receivables and investment in operating leases and their corresponding balance sheet location at September 30, 2020 and December 31, 2019: (amounts in thousands) Classification September 30, 2020 December 31, 2019 ASSETS Direct financing leases Lease receivables Loans and leases receivable $ 105,712 $ 91,762 Guaranteed residual assets Loans and leases receivable 6,723 7,435 Unguaranteed residual assets Loans and leases receivable 5,822 1,260 Deferred initial direct costs Loans and leases receivable 654 721 Unearned income Loans and leases receivable (11,709) (11,300) Net investment in direct financing leases $ 107,202 $ 89,878 Operating leases Investment in operating leases Other assets $ 119,271 $ 107,850 Accumulated depreciation Other assets (24,973) (14,251) Deferred initial direct costs Other assets 1,070 1,052 Net investment in operating leases 95,368 94,651 Total lease assets $ 202,570 $ 184,529

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Short Term Borrowings	Short-term debt at September 30, 2020 and December 31, 2019 was as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Amount Rate Amount Rate FHLB advances $ 850,000 1.24 % $ 500,000 2.15 % Federal funds purchased 680,000 0.14 % 538,000 1.60 % Total short-term debt $ 1,530,000 $ 1,038,000
Summary of Bancorps Short Term Borrowings	The following is a summary of additional information relating to Customers' short-term debt: September 30, 2020 December 31, 2019 (dollars in thousands) FHLB advances Maximum outstanding at any month end $ 910,000 $ 1,190,150 Average balance during the period 796,286 793,304 Weighted-average interest rate during the period 2.17 % 2.66 % Federal funds purchased Maximum outstanding at any month end 842,000 600,000 Average balance during the period 279,299 271,400 Weighted-average interest rate during the period 0.20 % 2.28 %
Schedule of Long-term Debt	Long-term FHLB and FRB advances at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Amount Rate Amount Rate FHLB advances $ — — % $ 350,000 2.36 % FRB PPP Liquidity Facility advances 4,811,009 0.35 % — — % Total long-term FHLB and FRB advances $ 4,811,009 $ 350,000 The maximum borrowing capacity with the FHLB and FRB at September 30, 2020 and December 31, 2019 was as follows: (amounts in thousands) September 30, 2020 December 31, 2019 Total maximum borrowing capacity with the FHLB $ 2,851,496 $ 3,445,416 Total maximum borrowing capacity with the FRB (1) 214,766 136,842 Qualifying loans serving as collateral against FHLB and FRB advances (1) 4,092,732 4,496,983 (1) Amounts reported in the above table exclude borrowings under the PPPLF, which are limited to the face value of the loans originated under the PPP. At September 30, 2020, Customers had $4.8 billion of borrowings under the PPPLF, with a borrowing capacity of up to $5.0 billion, which is the face value of the qualifying loans Customers has originated under the PPP. Senior and Subordinated Debt Long-term senior notes and subordinated debt at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 December 31, 2019 (dollars in thousands) Issued by Ranking Amount Amount Rate Issued Amount Date Issued Maturity Price Customers Bancorp Senior $ 24,522 $ 24,432 4.500 % $ 25,000 September 2019 September 2024 100.000 % Customers Bancorp Senior 99,413 99,198 3.950 % 100,000 June 2017 June 2022 99.775 % Total other borrowings 123,935 123,630 Customers Bancorp Subordinated (1)(2) 72,176 72,040 5.375 % 74,750 December 2019 December 2034 100.000 % Customers Bank Subordinated (1)(3) 109,148 109,075 6.125 % 110,000 June 2014 June 2029 100.000 % Total subordinated debt $ 181,324 $ 181,115 (1) The subordinated notes qualify as Tier 2 capital for regulatory capital purposes. (2) Customers Bancorp has the ability to call the subordinated notes, in whole, or in part, at a redemption price equal to 100% of the principal balance at certain times on or after December 30, 2029.

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Sep. 30, 2020
Regulatory Capital [Abstract]
Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios	Generally, to comply with the regulatory definition of adequately capitalized, or well capitalized, respectively, or to comply with the Basel III capital requirements, an institution must at least maintain the common equity Tier 1, Tier 1 and total risk-based capital ratios and the Tier 1 leverage ratio in excess of the related minimum ratios as set forth in the following table: Minimum Capital Levels to be Classified as: Actual Adequately Capitalized Well Capitalized Basel III Compliant (amounts in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio As of September 30, 2020: Common equity Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 902,174 7.488 % $ 542,199 4.500 % N/A N/A $ 843,420 7.000 % Customers Bank $ 1,217,159 10.120 % $ 541,217 4.500 % $ 781,757 6.500 % $ 841,892 7.000 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,119,645 9.293 % $ 722,932 6.000 % N/A N/A $ 1,024,153 8.500 % Customers Bank $ 1,217,159 10.120 % $ 721,622 6.000 % $ 962,163 8.000 % $ 1,022,298 8.500 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,361,237 11.298 % $ 963,909 8.000 % N/A N/A $ 1,265,130 10.500 % Customers Bank $ 1,397,059 11.616 % $ 962,163 8.000 % $ 1,202,704 10.000 % $ 1,262,839 10.500 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 1,119,645 8.534 % $ 524,799 4.000 % N/A N/A $ 524,799 4.000 % Customers Bank $ 1,217,159 9.288 % $ 524,203 4.000 % $ 655,254 5.000 % $ 524,203 4.000 % As of December 31, 2019: Common equity Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 821,810 7.984 % $ 463,211 4.500 % N/A N/A $ 720,551 7.000 % Customers Bank $ 1,164,652 11.323 % $ 462,842 4.500 % $ 668,549 6.500 % $ 719,976 7.000 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,039,281 10.096 % $ 617,615 6.000 % N/A N/A $ 874,955 8.500 % Customers Bank $ 1,164,652 11.323 % $ 617,122 6.000 % $ 822,829 8.000 % $ 874,256 8.500 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,256,309 12.205 % $ 823,487 8.000 % N/A N/A $ 1,080,827 10.500 % Customers Bank $ 1,330,155 12.933 % $ 822,829 8.000 % $ 1,028,537 10.000 % $ 1,079,964 10.500 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 1,039,281 9.258 % $ 449,026 4.000 % N/A N/A $ 449,026 4.000 % Customers Bank $ 1,164,652 10.379 % $ 448,851 4.000 % $ 561,064 5.000 % $ 448,851 4.000 %

Disclosures About Fair Value _2

Disclosures About Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of Customers' financial instruments at September 30, 2020 and December 31, 2019 were as follows. Fair Value Measurements at September 30, 2020 (amounts in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets: Cash and cash equivalents $ 331,416 $ 331,416 $ 331,416 $ — $ — Debt securities, available for sale 1,131,365 1,131,365 — 1,131,365 — Equity securities 2,466 2,466 2,466 — — Loans held for sale 26,689 26,689 — 6,998 19,691 Total loans and leases receivable, net of allowance for credit losses on loans and leases 16,423,029 17,070,867 — 3,913,593 13,157,274 FHLB, Federal Reserve Bank and other restricted stock 70,387 70,387 — 70,387 — Derivatives 60,810 60,810 — 60,355 455 Liabilities: Deposits $ 10,839,077 $ 10,843,133 $ 9,866,651 $ 976,482 $ — FRB advances 4,811,009 4,811,009 — 4,811,009 — Federal funds purchased 680,000 680,000 680,000 — — FHLB advances 850,000 854,104 — 854,104 — Other borrowings 123,935 102,594 — 102,594 — Subordinated debt 181,324 178,958 — 178,958 — Derivatives 110,649 110,649 — 110,649 — Fair Value Measurements at December 31, 2019 (amounts in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Assets: Cash and cash equivalents $ 212,505 $ 212,505 $ 212,505 $ — $ — Debt securities, available for sale 577,198 577,198 — 577,198 — Interest-only GNMA securities 16,272 16,272 — — 16,272 Equity securities 2,406 2,406 2,406 — — Loans held for sale 486,328 486,328 — 2,130 484,198 Total loans and leases receivable, net of allowance for credit losses on loans and leases 9,508,367 9,853,037 — 2,245,758 7,607,279 FHLB, Federal Reserve Bank and other restricted stock 84,214 84,214 — 84,214 — Derivatives 23,608 23,608 — 23,529 79 Liabilities: Deposits $ 8,648,936 $ 8,652,340 $ 6,980,402 $ 1,671,938 $ — Federal funds purchased 538,000 538,000 538,000 — — FHLB advances 850,000 852,162 — 852,162 — Other borrowings 123,630 127,603 — 127,603 — Subordinated debt 181,115 192,217 — 192,217 — Derivatives 45,939 45,939 — 45,939 —
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis	For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at September 30, 2020 and December 31, 2019 were as follows: September 30, 2020 Fair Value Measurements at the End of the Reporting Period Using (amounts in thousands) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Measured at Fair Value on a Recurring Basis: Assets Available for sale debt securities: Asset-backed securities $ — $ 375,381 $ — $ 375,381 U.S. government agencies securities — 40,008 — 40,008 Agency-guaranteed residential mortgage-backed securities — $ 61,079 — $ 61,079 Agency guaranteed collateralized mortgage obligations — 153,779 — 153,779 State and political subdivision debt securities — 18,259 — 18,259 Private label collateralized mortgage obligations — 118,987 — 118,987 Corporate notes — 363,872 — 363,872 Equity securities 2,466 — — 2,466 Derivatives — 60,355 455 60,810 Loans held for sale – fair value option — 6,998 — 6,998 Loans receivable, mortgage warehouse – fair value option — 3,913,593 — 3,913,593 Total assets – recurring fair value measurements $ 2,466 $ 5,112,311 $ 455 $ 5,115,232 Liabilities Derivatives $ — $ 110,649 $ — $ 110,649 Measured at Fair Value on a Nonrecurring Basis: Assets Loans held for sale $ — $ — $ 18,366 $ 18,366 Collateral-dependent loans — — 22,539 22,539 Total assets – nonrecurring fair value measurements $ — $ — $ 40,905 $ 40,905 December 31, 2019 Fair Value Measurements at the End of the Reporting Period Using (amounts in thousands) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Measured at Fair Value on a Recurring Basis: Assets Available for sale debt securities: Agency-guaranteed residential mortgage–backed securities $ — $ 278,321 $ — $ 278,321 Corporate notes — 298,877 — 298,877 Interest-only GNMA securities — — 16,272 16,272 Equity securities 2,406 — — 2,406 Derivatives — 23,529 79 23,608 Loans held for sale – fair value option — 2,130 — 2,130 Loans receivable, mortgage warehouse – fair value option — 2,245,758 — 2,245,758 Total assets – recurring fair value measurements $ 2,406 $ 2,848,615 $ 16,351 $ 2,867,372 Liabilities Derivatives $ — $ 45,939 $ — $ 45,939 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of specific reserves of $852 $ — $ — $ 14,272 $ 14,272 Other real estate owned — — 78 78 Total assets – nonrecurring fair value measurements $ — $ — $ 14,350 $ 14,350
Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in residential mortgage loan commitments (Level 3 assets) measured at fair value on a recurring basis for the three and nine months ended September 30, 2020 and 2019 are summarized in the tables below. Additional information about residential mortgage loan commitments can be found in NOTE 12 - DERIVATIVES INSTRUMENTS AND HEDGING ACTIVITIES. Residential Mortgage Loan Commitments Three Months Ended September 30, (amounts in thousands) 2020 2019 Balance at June 30 $ 52 $ 145 Issuances 455 150 Settlements (52) (145) Balance at September 30 $ 455 $ 150 Residential Mortgage Loan Commitments Nine Months Ended September 30, (amounts in thousands) 2020 2019 Balance at December 31 $ 79 $ 69 Issuances 722 372 Settlements (346) (291) Balance at September 30 $ 455 $ 150
Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value as of September 30, 2020 and December 31, 2019 on a recurring and nonrecurring basis for which Customers utilized Level 3 inputs to measure fair value. The unobservable Level 3 inputs noted below contain a level of uncertainty that may differ from what is realized in an immediate settlement of the assets. Therefore, Customers may realize a value higher or lower than the current estimated fair value of the assets. Quantitative Information about Level 3 Fair Value Measurements September 30, 2020 Fair Value Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Collateral-dependent loans – real estate $ 21,572 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% (8%) Collateral-dependent loans – commercial & industrial 967 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation adjustments (4) 7% - 8% (8%) 60% - 60% (60%) Residential mortgage loan commitments 455 Adjusted market bid Pull-through rate 81% - 81% (81%) (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. Customers does not generally discount appraisals. (2) Appraisals are adjusted by management for liquidation expenses. The range and weighted average of liquidation expense adjustments are presented as a percentage of the appraisal. (3) Business asset valuation obtained from independent party. (4) Business asset valuations may be adjusted by management for qualitative factors including economic conditions and the condition of the business assets. The range and weighted average of the business asset adjustments are presented as a percent of the business asset valuation. Quantitative Information about Level 3 Fair Value Measurements December 31, 2019 Fair Value Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans – real estate $ 12,767 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation (4) 8% - 10% (8%) 34% - 45% (37%) Impaired loans – commercial & industrial 1,505 Collateral appraisal (1) Business asset valuation (3) Liquidation expenses (2) Business asset valuation adjustments (4) 8% - 8% (8%) 8% - 50% (22%) Interest-only GNMA securities 16,272 Discounted cash flow Constant prepayment rate 9% - 14% 12% Other real estate owned 78 Collateral appraisal (1) Liquidation expenses (2) 8% - 9% (9%) Residential mortgage loan commitments 79 Adjusted market bid Pull-through rate 85% - 85% (85%) (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. Customers does not generally discount appraisals. (2) Appraisals are adjusted by management for liquidation expenses. The range and weighted average of liquidation expense adjustments are presented as a percentage of the appraisal. (3) Business asset valuation obtained from independent party. (4) Business asset valuations may be adjusted by management for qualitative factors including economic conditions and the condition of the business assets. The range and weighted average of the business asset adjustments are presented as a percent of the business asset valuation.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The following tables present the fair value of Customers' derivative financial instruments as well as their presentation on the balance sheet as of September 30, 2020 and December 31, 2019. September 30, 2020 Derivative Assets Derivative Liabilities (amounts in thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 46,785 Total $ — $ 46,785 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 59,962 Other liabilities $ 63,340 Interest rate caps Other assets 9 Other liabilities 9 Credit contracts Other assets 384 Other liabilities 515 Residential mortgage loan commitments Other assets 455 Other liabilities — Total $ 60,810 $ 63,864 December 31, 2019 Derivative Assets Derivative Liabilities (amounts in thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 21,374 Total $ — $ 21,374 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 23,301 Other liabilities $ 24,797 Interest rate caps Other assets 9 Other liabilities 9 Credit contracts Other assets 219 Other liabilities (241) Residential mortgage loan commitments Other assets 79 Other liabilities — Total $ 23,608 $ 24,565
Effect of Derivative Financial Instruments on Net Income and Comprehensive Income	The following tables present amounts included in the consolidated statements of income related to derivatives not designated as hedges for the three and nine months ended September 30, 2020 and 2019. Amount of Income (Loss) Recognized in Earnings Three Months Ended September 30, Nine Months Ended September 30, (amounts in thousands) Income Statement Location 2020 2019 2020 2019 Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 387 $ (35) $ (6,191) $ 63 Interest rate caps Other non-interest income — — — — Credit contracts Other non-interest income 162 85 1,436 228 Residential mortgage loan commitments Mortgage banking income 403 5 376 82 Total $ 952 $ 55 $ (4,379) $ 373 Effect of Derivative Instruments on Comprehensive Income The following table presents the effect of Customers' derivative financial instruments on comprehensive income for the three and nine months ended September 30, 2020 and 2019. Amount of Gain (Loss) Recognized in OCI on Derivatives (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Three Months Ended September 30, Three Months Ended (amounts in thousands) 2020 2019 2020 2019 Derivatives in cash flow hedging relationships: Interest rate swaps $ 429 $ (3,821) Interest expense $ (4,400) $ (764) Amount of Gain (Loss) Recognized in OCI on Derivatives (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Nine Months Ended September 30, Nine Months Ended (amounts in thousands) 2020 2019 2020 2019 Derivatives in cash flow hedging relationships: Interest rate swaps $ (24,602) $ (19,391) Interest expense $ (8,596) $ (355)
Summary of Offsetting of Financial Assets and Derivative Assets	The following tables present derivative instruments that are subject to enforceable master netting arrangements. Customers' interest rate swaps and interest rate caps with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps and interest rate caps with commercial banking customers and residential mortgage loan commitments are not subject to master netting arrangements and are excluded from the table below. Customers has not made a policy election to offset its derivative positions. Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount September 30, 2020 Interest rate derivative assets with institutional counterparties $ — $ — $ — $ — Interest rate derivative liabilities with institutional counterparties $ 110,039 $ — $ (110,039) $ — Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount December 31, 2019 Interest rate derivative assets with institutional counterparties $ 432 $ — $ — $ 432 Interest rate derivative liabilities with institutional counterparties $ 45,727 $ — $ (45,727) $ —
Summary of Offsetting of Financial Liabilities and Derivative Liabilities	The following tables present derivative instruments that are subject to enforceable master netting arrangements. Customers' interest rate swaps and interest rate caps with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps and interest rate caps with commercial banking customers and residential mortgage loan commitments are not subject to master netting arrangements and are excluded from the table below. Customers has not made a policy election to offset its derivative positions. Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount September 30, 2020 Interest rate derivative assets with institutional counterparties $ — $ — $ — $ — Interest rate derivative liabilities with institutional counterparties $ 110,039 $ — $ (110,039) $ — Gross Amounts Recognized on the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheet (amounts in thousands) Financial Instruments Cash Collateral Received/(Posted) Net Amount December 31, 2019 Interest rate derivative assets with institutional counterparties $ 432 $ — $ — $ 432 Interest rate derivative liabilities with institutional counterparties $ 45,727 $ — $ (45,727) $ —

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables present the operating results for Customers' reportable business segments for the three and nine months ended September 30, 2020 and 2019. The segment financial results include directly attributable revenues and expenses. Consistent with the presentation of segment results to Customers' chief operating decision makers, overhead costs and preferred stock dividends are assigned to the Customers Bank Business Banking segment. The tax benefit assigned to BankMobile was based on an estimated effective tax rate of 20.61% for 2020 and 23.15% for 2019, respectively. Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 126,648 $ 13,002 $ 139,650 $ 113,995 $ 12,723 $ 126,718 Interest expense 31,718 493 32,211 50,734 249 50,983 Net interest income 94,930 12,509 107,439 63,261 12,474 75,735 Provision for credit losses on loans and leases 8,699 4,256 12,955 2,475 1,951 4,426 Non-interest income 21,603 12,190 33,793 11,757 11,612 23,369 Non-interest expense 48,926 16,635 65,561 38,347 21,245 59,592 Income (loss) before income tax expense (benefit) 58,908 3,808 62,716 34,196 890 35,086 Income tax expense (benefit) 11,374 827 12,201 7,814 206 8,020 Net income (loss) 47,534 2,981 50,515 26,382 684 27,066 Preferred stock dividends 3,430 — 3,430 3,615 — 3,615 Net income (loss) available to common shareholders $ 44,104 $ 2,981 $ 47,085 $ 22,767 $ 684 $ 23,451 (1) Amounts reported include funds transfer pricing of $2.2 million and $0.3 million, for the three months ended September 30, 2020 and 2019, respectively, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the use of excess low/no cost deposits. Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 351,819 $ 38,393 $ 390,212 $ 309,882 $ 29,863 $ 339,745 Interest expense 108,251 1,219 109,470 139,402 625 140,027 Net interest income 243,568 37,174 280,742 170,480 29,238 199,718 Provision for credit losses on loans and leases 55,620 10,068 65,688 3,245 11,294 14,539 Non-interest income 44,422 33,537 77,959 20,304 34,821 55,125 Non-interest expense 137,055 58,470 195,525 111,840 61,320 173,160 Income (loss) before income tax expense (benefit) 95,315 2,173 97,488 75,699 (8,555) 67,144 Income tax expense (benefit) 20,708 448 21,156 17,324 (1,981) 15,343 Net income (loss) 74,607 1,725 76,332 58,375 (6,574) 51,801 Preferred stock dividends 10,626 — 10,626 10,844 — 10,844 Net income (loss) available to common shareholders $ 63,981 $ 1,725 $ 65,706 $ 47,531 $ (6,574) $ 40,957 As of September 30, 2020 and 2019 Goodwill and other intangibles $ 3,629 $ 10,808 $ 14,437 $ 3,629 $ 11,892 $ 15,521 Total assets (2) $ 18,203,784 $ 574,943 $ 18,778,727 $ 11,131,914 $ 591,876 $ 11,723,790 Total deposits $ 9,895,328 $ 943,749 $ 10,839,077 $ 8,260,080 $ 665,605 $ 8,925,685 Total non-deposit liabilities (2) $ 6,853,184 $ 34,975 $ 6,888,159 $ 1,747,846 $ 31,109 $ 1,778,955 (1) Amounts reported include funds transfer pricing of $5.3 million and $8.1 million, for the nine months ended September 30, 2020 and 2019, respectively, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the use of excess low/no cost deposits. (2) Amounts reported exclude inter-segment receivables/payables.

Non-Interest Revenues (Tables)

Non-Interest Revenues (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents Customers' non-interest revenues affected by ASC 606 by business segment for the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue (1) $ (3,148) $ 7,229 $ 4,081 $ 181 $ 6,688 $ 6,869 Deposit fees 651 2,788 3,439 457 3,185 3,642 University fees - card and disbursement fees — 310 310 — 262 262 Total revenue recognized at point in time (2,497) 10,327 7,830 638 10,135 10,773 Revenue recognized over time: University fees - subscription revenue — 1,039 1,039 — 1,006 1,006 Total revenue recognized over time — 1,039 1,039 — 1,006 1,006 Total revenue from contracts with customers $ (2,497) $ 11,366 $ 8,869 $ 638 $ 11,141 $ 11,779 Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue (1) $ (2,685) $ 20,053 $ 17,368 $ 580 $ 21,855 $ 22,435 Deposit fees 1,704 8,517 10,221 1,190 8,009 9,199 University fees - card and disbursement fees — 990 990 — 783 783 Total revenue recognized at point in time (981) 29,560 28,579 1,770 30,647 32,417 Revenue recognized over time: University fees - subscription revenue — 3,038 3,038 — 2,953 2,953 Total revenue recognized over time — 3,038 3,038 — 2,953 2,953 Total revenue from contracts with customers $ (981) $ 32,598 $ 31,617 $ 1,770 $ 33,600 $ 35,370 (1) Beginning on July 1, 2020, Customers Bank became subject to the Federal Reserve's regulation limits on interchange fees for banks over $10 billion in assets. Customers Bank Business Banking has agreed to pay BankMobile the difference between the regulated and unregulated interchange rates. For the three and nine months ended September 30, 2020, BankMobile received $3.2 million for the difference between the regulated and unregulated interchange rates.

Description of the Business - A

Description of the Business - Additional Information (Detail)	Sep. 30, 2020numberOfContracts
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of branches (branch)	13

Significant Accounting Polici_4

Significant Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative decrease from change in accounting principle - CECL		$ (1,051,491)	$ (1,052,795)	$ (1,007,847)	$ (1,019,150)	$ (991,405)	$ (956,816)
Deferred taxes			$ 11,740
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Available-for-sale debt securities, accrued interest		$ 4,200
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Initial allowance on loans purchased with credit deterioration	$ 200
Financing receivable, purchased with credit deterioration, discount	300
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative decrease from change in accounting principle - CECL		$ (385,750)	$ (381,519)	$ (338,665)	$ (357,608)	$ (334,157)	$ (316,651)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative decrease from change in accounting principle - CECL			61,475
Deferred taxes	(21,510)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative decrease from change in accounting principle - CECL	$ 61,500		$ 61,475

Significant Accounting Polici_5

Significant Accounting Policies and Basis of Presentation - Impact of ASC 326 (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Jan. 01, 2020	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Assets
Loans receivable, mortgage warehouse, at fair value	$ 3,913,593	$ 2,245,758
Loans and leases receivable	7,700,892	7,318,988
Allowance for credit losses on loans and leases	(155,561)	(56,379)	$ (159,905)	$ (136,200)	$ (51,053)	$ (48,388)	$ (39,972)
Total loans and leases receivable, net of allowance for credit losses	16,423,029	9,508,367
Liabilities:
Allowance for credit losses on lending-related commitments		49
Net deferred tax (asset) liability		11,740
Equity
Retained earnings	$ 385,750	381,519
Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans receivable, mortgage warehouse, at fair value				0
Loans and leases receivable				232
Allowance for credit losses on loans and leases		(79,829)		(79,829)
Total loans and leases receivable, net of allowance for credit losses				(79,596)
Liabilities:
Allowance for credit losses on lending-related commitments				3,388
Net deferred tax (asset) liability				(21,510)
Equity
Retained earnings				(61,475)
Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans receivable, mortgage warehouse, at fair value				2,245,758
Loans and leases receivable				7,319,220
Allowance for credit losses on loans and leases				(136,208)
Total loans and leases receivable, net of allowance for credit losses				9,428,771
Liabilities:
Allowance for credit losses on lending-related commitments				3,437
Net deferred tax (asset) liability				(9,770)
Equity
Retained earnings				320,044
Commercial Portfolio Segment
Assets
Loans and leases receivable		5,690,820
Commercial Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				151
Commercial Portfolio Segment | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				5,690,971
Commercial Portfolio Segment | Multi-family
Assets
Loans and leases receivable		1,907,331
Commercial Portfolio Segment | Multi-family | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				7
Commercial Portfolio Segment | Multi-family | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				1,907,338
Commercial Portfolio Segment | Commercial and industrial
Assets
Loans and leases receivable		1,891,152
Commercial Portfolio Segment | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				3
Commercial Portfolio Segment | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				1,891,155
Commercial Portfolio Segment | Commercial real estate owner occupied
Assets
Loans and leases receivable		551,948
Commercial Portfolio Segment | Commercial real estate owner occupied | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				100
Commercial Portfolio Segment | Commercial real estate owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				552,048
Commercial Portfolio Segment | Commercial real estate non-owner occupied
Assets
Loans and leases receivable		1,222,772
Commercial Portfolio Segment | Commercial real estate non-owner occupied | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				41
Commercial Portfolio Segment | Commercial real estate non-owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				1,222,813
Commercial Portfolio Segment | Construction
Assets
Loans and leases receivable		117,617
Commercial Portfolio Segment | Construction | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				0
Commercial Portfolio Segment | Construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				117,617
Consumer Portfolio Segment
Assets
Loans and leases receivable		1,628,168
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				81
Consumer Portfolio Segment | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				1,628,249
Consumer Portfolio Segment | Residential real estate
Assets
Loans and leases receivable		382,634
Consumer Portfolio Segment | Residential real estate | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				32
Consumer Portfolio Segment | Residential real estate | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				382,666
Consumer Portfolio Segment | Manufactured housing
Assets
Loans and leases receivable		71,359
Consumer Portfolio Segment | Manufactured housing | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				37
Consumer Portfolio Segment | Manufactured housing | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				71,396
Consumer Portfolio Segment | Installment
Assets
Loans and leases receivable		$ 1,174,175
Consumer Portfolio Segment | Installment | Cumulative Effect, Period of Adoption, Adjustment
Assets
Loans and leases receivable				12
Consumer Portfolio Segment | Installment | Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Loans and leases receivable				$ 1,174,187

Earnings (Loss) Per Share - Com

Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 47,085	$ 23,451	$ 65,706	$ 40,957
Weighted-average number of common shares outstanding - basic (shares)	31,517,504	31,223,777	31,462,284	31,142,400
Share-based compensation plans (shares)	218,807	420,951	203,743	438,629
Weighted-average number of common shares - diluted (shares)	31,736,311	31,644,728	31,666,027	31,581,029
Basic earnings (loss) per common share (usd per share)	$ 1.49	$ 0.75	$ 2.09	$ 1.32
Diluted earnings (loss) per common share (usd per share)	$ 1.48	$ 0.74	$ 2.07	$ 1.30

Earnings (Loss) Per Share - Ant

Earnings (Loss) Per Share - Anti-dilutive Securities Excluded from Computation of Earnings (Loss) Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based compensation awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (shares)	862,417	2,181,195	862,417	2,233,160

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,007,847	$ 991,405	$ 1,052,795	$ 956,816
Unrealized gains (losses) arising during period, before tax	(510)	2,695	(8,359)	20,226
Income tax effect	132	(701)	2,351	(5,259)
Other comprehensive income (loss) before reclassifications	(378)	1,994	(6,008)	14,967
Reclassification adjustments for (gains) losses included in net income, before tax	(7,307)	(237)	(11,439)	(646)
Income tax effect	1,899	62	2,946	168
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(5,408)	(175)	(8,493)	(478)
Other comprehensive income (loss), net of income tax effect	(5,786)	1,819	(14,501)	14,489
Ending balance	1,051,491	1,019,150	1,051,491	1,019,150
Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	27,525	6,802	14,287	(21,741)
Unrealized gains (losses) arising during period, before tax	(1,090)	7,858	25,127	46,430
Income tax effect	283	(2,043)	(6,533)	(12,072)
Other comprehensive income (loss) before reclassifications	(807)	5,815	18,594	34,358
Reclassification adjustments for (gains) losses included in net income, before tax	(11,707)	(1,001)	(20,035)	(1,001)
Income tax effect	3,044	260	5,209	260
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(8,663)	(741)	(14,826)	(741)
Other comprehensive income (loss), net of income tax effect	(9,470)	5,074	3,768	33,617
Ending balance	18,055	11,876	18,055	11,876
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(37,490)	(16,795)	(15,537)	(922)
Unrealized gains (losses) arising during period, before tax	580	(5,163)	(33,486)	(26,204)
Income tax effect	(151)	1,342	8,884	6,813
Other comprehensive income (loss) before reclassifications	429	(3,821)	(24,602)	(19,391)
Reclassification adjustments for (gains) losses included in net income, before tax	4,400	764	8,596	355
Income tax effect	(1,145)	(198)	(2,263)	(92)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	3,255	566	6,333	263
Other comprehensive income (loss), net of income tax effect	3,684	(3,255)	(18,269)	(19,128)
Ending balance	(33,806)	(20,050)	(33,806)	(20,050)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(9,965)	(9,993)	(1,250)	(22,663)
Other comprehensive income (loss), net of income tax effect	(5,786)	1,819	(14,501)	14,489
Ending balance	$ (15,751)	$ (8,174)	$ (15,751)	$ (8,174)

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,106,966	$ 557,891
Gross Unrealized Gains	24,757	19,307
Gross Unrealized Losses	(358)	0
Fair Value	1,131,365	577,198
Equity securities, at fair value	2,466	2,406
Investment securities, at fair value	1,133,831	595,876
Accrued interest receivable	65,668	38,072
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	4,200
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	374,151
Gross Unrealized Gains	1,404
Gross Unrealized Losses	(174)
Fair Value	375,381
U.S. government agencies securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,000
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Fair Value	40,008
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,013	273,252
Gross Unrealized Gains	2,066	5,069
Gross Unrealized Losses	0	0
Fair Value	61,079	278,321
Agency-guaranteed collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	153,088
Gross Unrealized Gains	771
Gross Unrealized Losses	(80)
Fair Value	153,779
State and political subdivision debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,391
Gross Unrealized Gains	868
Gross Unrealized Losses	0
Fair Value	18,259
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	118,979
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Fair Value	118,987
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	344,344	284,639
Gross Unrealized Gains	19,632	14,238
Gross Unrealized Losses	(104)	0
Fair Value	$ 363,872	298,877
Interest-only GNMA securities
Debt Securities, Available-for-sale [Line Items]
Interest-only GNMA securities		$ 16,272

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020USD ($)numberOfContracts	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Sep. 30, 2020USD ($)numberOfContracts	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)numberOfContracts
Investments
Loss upon acquisition of interest-only GNMA securities	$ 0	$ 0		$ 0	$ 7,476
Proceeds from sale of other investments				13,827	7,832
Unrealized gain (loss) on investment securities	200	1,300		100	1,000
Proceeds from sales of investment securities available for sale	268,600	97,600		377,767	97,555
Realized gain	$ 11,700	$ 1,000		$ 20,000	$ 1,000
Number of available-for-sale investment securities in the less than twelve month category | numberOfContracts	15			15		0
Number of available-for-sale investment securities in the twelve month category | numberOfContracts	0			0		0
Pledged investment securities fair value	$ 20,100			$ 20,100		$ 20,400
Interest-only GNMA securities
Investments
Loss upon acquisition of interest-only GNMA securities			$ 7,500
Proceeds from sale of other investments	15,400
Realized gain	$ 1,000

Investment Securities - Summa_2

Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 8,000
Due after one years through five years, amortized cost	83,209
Due after five through ten years, amortized cost	274,135
Due after ten years, amortized cost	36,391
Amortized Cost	1,106,966	$ 557,891
Due in one year or less, fair value	8,000
Due after one years through five years, fair value	84,275
Due after five through ten years, fair value	292,605
Due after ten years, fair value	37,259
Total Debt Securities Fair Value	1,131,365
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	374,151
Amortized Cost	374,151
Debt securities, available-for-sale, without single maturity date, fair value	375,381
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	59,013
Amortized Cost	59,013	$ 273,252
Debt securities, available-for-sale, without single maturity date, fair value	61,079
Agency-guaranteed collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	153,088
Amortized Cost	153,088
Debt securities, available-for-sale, without single maturity date, fair value	153,779
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	118,979
Amortized Cost	118,979
Debt securities, available-for-sale, without single maturity date, fair value	$ 118,987

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) $ in Thousands	Sep. 30, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 167,038
Less than 12 Months, Unrealized Losses	(358)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	167,038
Unrealized Losses	(358)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	107,610
Less than 12 Months, Unrealized Losses	(174)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	107,610
Unrealized Losses	(174)
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	19,019
Less than 12 Months, Unrealized Losses	(80)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	19,019
Unrealized Losses	(80)
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	40,409
Less than 12 Months, Unrealized Losses	(104)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	40,409
Unrealized Losses	$ (104)

Loans Held for Sale - Compositi

Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables Held-for-sale [Abstract]
Multi-family loans, at lower of cost or fair value	$ 0	$ 482,873
Commercial real estate non-owner occupied loans, at lower of cost or fair value	18,366	0
Total commercial loans held for sale	18,366	482,873
Home equity conversion mortgages, at lower of cost or fair value	1,325	1,325
Residential mortgage loans, at fair value	6,998	2,130
Total consumer loans held for sale	8,323	3,455
Loans held for sale	$ 26,689	$ 486,328

Loans Held for Sale - Narrative

Loans Held for Sale - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Receivables Held-for-sale [Abstract]
Transfer of multi-family loans held for sale to held for investment	$ 401,100	$ 401,144	$ 0
Loans held-for-sale (including nonperforming loans)	$ 19,700	$ 19,700		$ 1,300

Loans and Leases Receivable a_3

Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, mortgage warehouse, at fair value	$ 3,913,593			$ 2,245,758
Loans receivable, PPP	4,964,105			0
Loans and leases receivable	7,700,892			7,318,988
Allowance for credit losses on loans and leases	(155,561)	$ (159,905)	$ (136,200)	(56,379)	$ (51,053)	$ (48,388)	$ (39,972)
Total loans and leases receivable, net of allowance for credit losses	16,423,029			9,508,367
Deferred (fees) costs and unamortized (discounts) premiums, net	(74,700)			2,100
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,950,300			1,909,274
Allowance for credit losses on loans and leases	(15,026)	(14,697)		(6,157)	(7,498)	(9,926)	(11,462)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	122,963			118,418
Allowance for credit losses on loans and leases	(6,423)	(5,297)		(1,262)	(658)	(649)	(624)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	335,452			375,014
Allowance for credit losses on loans and leases	(4,649)	(4,550)		(3,218)	(4,083)	(4,168)	(3,654)
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	64,638			70,398
Allowance for credit losses on loans and leases	(5,625)	(6,014)		(1,060)	(1,027)	(123)	(145)
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,233,713			1,178,283
Allowance for credit losses on loans and leases	(81,160)	$ (79,147)		(20,648)	$ (12,582)	$ (10,267)	$ (2,529)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	6,067,089			5,690,820
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,950,300			1,907,331
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,220,715			1,891,152
Commercial | Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	557,595			551,948
Commercial | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,215,516			1,222,772
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	122,963			117,617
Commercial | Direct Finance Equipment Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	106,500			89,200
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,633,803			1,628,168
Consumer | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	335,452			382,634
Consumer | Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	64,638			71,359
Consumer | Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,233,713			$ 1,174,175

Loans and Leases Receivable a_4

Loans and Leases Receivable and Allowance for Credit Losses - Additional Information (Detail)	Sep. 30, 2020USD ($)Commitment	Jan. 01, 2020USD ($)	Sep. 30, 2020USD ($)Commitment	Sep. 30, 2020USD ($)LoanCommitment	Sep. 30, 2019USD ($)Loan	Jun. 30, 2020USD ($)	Sep. 30, 2020USD ($)LoanCommitment	Sep. 30, 2019USD ($)Loan	Dec. 31, 2019USD ($)Commitment	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	$ 65,668,000		$ 65,668,000	$ 65,668,000			$ 65,668,000		$ 38,072,000
Loans receivable	16,423,029,000		16,423,029,000	16,423,029,000			16,423,029,000		9,508,367,000
Interest income				132,107,000	$ 118,444,000		$ 366,634,000	$ 315,126,000
Loans held for sale, average life from purchase to sale							30 days
Accrued interest reversed							$ 1,200,000
Allowance for credit losses on loans and leases	155,561,000	$ 136,200,000	155,561,000	155,561,000	$ 51,053,000	$ 159,905,000	155,561,000	$ 51,053,000	56,379,000	$ 48,388,000	$ 39,972,000
Allowance for credit loss, period increase							19,400,000
Loans reported as TDR	16,100,000		16,100,000	16,100,000			$ 16,100,000		13,300,000
Minimum performance requirement							9 months
Lease receivable, TDR	$ 0		$ 0	$ 0			$ 0		$ 0
Number of loans | Loan				67	7		105	21
Number of commitments to lend additional funds (commitment) | Commitment	0		0	0			0		0
Purchased-credit-impaired loans	$ 14,400,000					17,488,000
Financing receivable sale				$ 21,568,000	$ 0		$ 23,390,000	$ 0
Loans pledged as collateral	8,900,000,000		$ 8,900,000,000	8,900,000,000			8,900,000,000		$ 4,600,000,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	5,000,000,000		5,000,000,000	5,000,000,000			5,000,000,000
Interest income				24,300,000			36,000,000
Accounting Standards Update 2016-13
Financing Receivable, Troubled Debt Restructuring [Line Items]
Initial allowance on loans purchased with credit deterioration		200,000
Financing receivable, purchased with credit deterioration, discount		$ 300,000
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Residential real estate held in other real estate owned	100,000		100,000	100,000			100,000		200,000
Loans in process of foreclosure	500,000		500,000	500,000			500,000		900,000
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable sale				3,968,000	0		3,968,000	0
Commercial real estate non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	79,000,000		79,000,000	79,000,000			79,000,000
Financing receivable sale			17,600,000
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses on loans and leases	15,026,000		15,026,000	15,026,000	$ 7,498,000	14,697,000	15,026,000	$ 7,498,000	6,157,000	$ 9,926,000	$ 11,462,000
Purchased-credit-impaired loans						$ 1,688,000
Consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	25,000,000		25,000,000	$ 25,000,000			$ 25,000,000
Forgiveness of debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan				0	0		0	0
Other Assets
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	61,900,000		61,900,000	$ 61,900,000			$ 61,900,000		$ 34,800,000
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	32,100,000		32,100,000	32,100,000			32,100,000
Government-Guaranteed Collateral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans pledged as collateral	$ 4,800,000,000		$ 4,800,000,000	$ 4,800,000,000			$ 4,800,000,000

Loans and Leases Receivable a_5

Loans and Leases Receivable and Allowance for Credit Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 64,700		$ 64,700	$ 35,123
Non-accrual	43,880		43,880	20,021
Loans and leases not past due	7,636,192		7,636,192	7,244,271
Purchased-credit-impaired loans	14,400	$ 17,488
Loans and lease receivable, gross	7,700,892		$ 7,700,892	7,318,988
Financing receivable, at amortized cost or lower of cost or market				7,316,903
Delinquent period			30 days
Loans receivable, PPP	4,964,105		$ 4,964,105	0
30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	6,688		6,688
60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	26,847		26,847
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				33,329
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	31,165		31,165	1,794
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	20,236		20,236	2,133
Non-accrual	11,710		11,710	4,117
Loans and leases not past due	1,930,064		1,930,064	1,901,336
Purchased-credit-impaired loans		1,688
Loans and lease receivable, gross	1,950,300		1,950,300	1,909,274
Multi-family | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Multi-family | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	15,446		15,446
Multi-family | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				2,133
Multi-family | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,790		4,790	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	9,767		9,767	2,395
Non-accrual	9,633		9,633	4,531
Loans and leases not past due	2,210,948		2,210,948	1,882,700
Purchased-credit-impaired loans		354
Loans and lease receivable, gross	2,220,715		2,220,715	1,889,980
Commercial and industrial | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Commercial and industrial | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,072		2,072
Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				2,395
Commercial and industrial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	7,695		7,695	0
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	3,388		3,388	5,388
Non-accrual	3,599		3,599	1,963
Loans and leases not past due	554,207		554,207	537,992
Purchased-credit-impaired loans		6,664
Loans and lease receivable, gross	557,595		557,595	552,007
Commercial real estate owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Commercial real estate owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	952		952
Commercial real estate owner occupied | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				5,388
Commercial real estate owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,436		2,436	0
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,356		2,356	8,034
Non-accrual	2,408		2,408	76
Loans and leases not past due	1,213,160		1,213,160	1,211,892
Purchased-credit-impaired loans		3,527
Loans and lease receivable, gross	1,215,516		1,215,516	1,223,529
Commercial real estate non-owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Commercial real estate non-owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Commercial real estate non-owner occupied | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				8,034
Commercial real estate non-owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,356		2,356	0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0	0
Non-accrual				0
Loans and leases not past due	122,963		122,963	118,418
Purchased-credit-impaired loans		0
Loans and lease receivable, gross	122,963		122,963	118,418
Construction | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Construction | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0
Construction | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				0
Construction | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0		0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	9,923		9,923	5,924
Non-accrual	10,634		10,634	6,128
Loans and leases not past due	325,529		325,529	359,491
Purchased-credit-impaired loans		3,471
Loans and lease receivable, gross	335,452		335,452	375,014
Residential real estate | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	436		436
Residential real estate | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	3,160		3,160
Residential real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				5,924
Residential real estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	6,327		6,327	0
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	5,855		5,855	5,493
Non-accrual	2,778		2,778	1,655
Loans and leases not past due	58,783		58,783	61,649
Purchased-credit-impaired loans		1,601
Loans and lease receivable, gross	64,638		64,638	70,398
Manufactured housing | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	784		784
Manufactured housing | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	608		608
Manufactured housing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				3,699
Manufactured housing | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,463		4,463	1,794
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	13,175		13,175	5,756
Non-accrual	3,118		3,118	1,551
Loans and leases not past due	1,220,538		1,220,538	1,170,793
Purchased-credit-impaired loans		$ 183
Loans and lease receivable, gross	1,233,713		1,233,713	1,178,283
Installment | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	5,468		5,468
Installment | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,609		4,609
Installment | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due				5,756
Installment | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 3,098		$ 3,098	$ 0

Loans and Leases Receivable a_6

Loans and Leases Receivable and Allowance for Credit Losses - Summary of Amortized Cost of Loans and Leases on Nonaccrual Status (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	$ 33,939	$ 13,084
Nonaccrual loans with related allowance	9,941	6,937
Total nonaccrual loans	43,880	20,021
Multi-family
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	8,749	4,117
Nonaccrual loans with related allowance	2,961	0
Total nonaccrual loans	11,710	4,117
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	8,749	3,083
Nonaccrual loans with related allowance	884	1,448
Total nonaccrual loans	9,633	4,531
Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	3,399	1,109
Nonaccrual loans with related allowance	200	854
Total nonaccrual loans	3,599	1,963
Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	2,408	76
Nonaccrual loans with related allowance	0	0
Total nonaccrual loans	2,408	76
Residential real estate
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	10,634	4,559
Nonaccrual loans with related allowance	0	1,569
Total nonaccrual loans	10,634	6,128
Manufactured housing
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	0	0
Nonaccrual loans with related allowance	2,778	1,655
Total nonaccrual loans	2,778	1,655
Installment
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	0	140
Nonaccrual loans with related allowance	3,118	1,411
Total nonaccrual loans	$ 3,118	$ 1,551

Loans and Leases Receivable a_7

Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 159,905	$ 48,388	$ 56,379	$ 39,972
Cumulative effect of change in accounting principle	159,905	51,053	56,379	51,053	$ 136,200
Charge-offs	(21,946)	(2,200)	(52,212)	(4,794)
Recoveries	4,647	439	5,877	1,336
Provision for credit losses on loans and leases	12,955	4,426	65,688	14,539
Ending balance	155,561	51,053	155,561	51,053
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14,697	9,926	6,157	11,462
Cumulative effect of change in accounting principle	15,026	7,498	6,157	7,498
Charge-offs	0	0	0	(541)
Recoveries	0	0	0	7
Provision for credit losses on loans and leases	329	(2,428)	6,698	(3,430)
Ending balance	15,026	7,498	15,026	7,498
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,302	13,736	15,556	12,145
Cumulative effect of change in accounting principle	12,926	15,875	15,556	15,875
Charge-offs	(2,527)	(349)	(2,645)	(532)
Recoveries	2,582	369	2,661	826
Provision for credit losses on loans and leases	569	2,119	(3,405)	3,436
Ending balance	12,926	15,875	12,926	15,875
Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,405	3,360	2,235	3,320
Cumulative effect of change in accounting principle	9,552	2,890	2,235	2,890
Charge-offs	(44)	(45)	(44)	(119)
Recoveries	0	10	5	235
Provision for credit losses on loans and leases	(1,809)	(435)	1,583	(546)
Ending balance	9,552	2,890	9,552	2,890
Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	26,493	6,159	6,243	6,093
Cumulative effect of change in accounting principle	20,200	6,440	20,200	6,440
Charge-offs	(10,181)	0	(25,779)	0
Recoveries	1,258	0	1,258	0
Provision for credit losses on loans and leases	2,630	281	30,560	347
Ending balance	20,200	6,440	20,200	6,440
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,297	649	1,262	624
Cumulative effect of change in accounting principle	6,423	658	1,262	658
Charge-offs	0	0	0	0
Recoveries	6	8	122	128
Provision for credit losses on loans and leases	1,120	1	5,137	(94)
Ending balance	6,423	658	6,423	658
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,550	4,168	3,218	3,654
Cumulative effect of change in accounting principle	4,649	4,083	4,649	3,654
Charge-offs	0	0	0	(109)
Recoveries	17	5	72	20
Provision for credit losses on loans and leases	82	(90)	(159)	518
Ending balance	4,649	4,083	4,649	4,083
Manufactured housing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,014	123	1,060	145
Cumulative effect of change in accounting principle	5,625	1,027	1,060	145
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for credit losses on loans and leases	(389)	904	763	882
Ending balance	5,625	1,027	5,625	1,027
Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	79,147	10,267	20,648	2,529
Cumulative effect of change in accounting principle	81,160	12,582	20,648	2,529
Charge-offs	(9,194)	(1,806)	(23,744)	(3,493)
Recoveries	784	47	1,759	120
Provision for credit losses on loans and leases	10,423	4,074	24,511	13,426
Ending balance	$ 81,160	$ 12,582	81,160	$ 12,582
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			79,829
Cumulative effect of change in accounting principle			79,829		$ 79,829
Cumulative Effect, Period of Adoption, Adjustment | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			2,171
Cumulative effect of change in accounting principle			2,171
Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			759
Cumulative effect of change in accounting principle			759
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			5,773
Cumulative effect of change in accounting principle			5,773
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			7,918
Cumulative effect of change in accounting principle			7,918
Cumulative Effect, Period of Adoption, Adjustment | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			(98)
Cumulative effect of change in accounting principle			(98)
Cumulative Effect, Period of Adoption, Adjustment | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			1,518
Cumulative effect of change in accounting principle			1,518
Cumulative Effect, Period of Adoption, Adjustment | Manufactured housing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			3,802
Cumulative effect of change in accounting principle			3,802
Cumulative Effect, Period of Adoption, Adjustment | Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			57,986
Cumulative effect of change in accounting principle			$ 57,986

Loans and Leases Receivable a_8

Loans and Leases Receivable and Allowance for Credit Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)Loan	Sep. 30, 2019USD ($)Loan	Sep. 30, 2020USD ($)Loan	Sep. 30, 2019USD ($)Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	67	7	105	21
Recorded investment | $	$ 1,473	$ 196	$ 3,231	$ 1,142
Extensions of maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	0	6	2
Recorded investment | $	$ 0	$ 0	$ 385	$ 514
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	2	7	34	19
Recorded investment | $	$ 88	$ 196	$ 1,461	$ 628
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	65	0	65	0
Recorded investment | $	$ 1,385	$ 0	$ 1,385	$ 0

Loans and Leases Receivable a_9

Loans and Leases Receivable and Allowance for Credit Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)Loan	Sep. 30, 2019USD ($)Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	15	4
Recorded Investment | $	$ 1,374	$ 158
Manufactured housing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	5	3
Recorded Investment | $	$ 201	$ 76
Commercial real estate owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	1	0
Recorded Investment | $	$ 952	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	1	1
Recorded Investment | $	$ 95	$ 82
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	8	0
Recorded Investment | $	$ 126	$ 0

Loans and Leases Receivable _10

Loans and Leases Receivable and Allowance for Credit Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,240,838
2019	1,658,063
2018	807,657
2017	1,147,074
2016	657,408
2015	1,274,192
Revolving loans amortized cost basis	915,660
Revolving loans converted to term	0
Total loans and leases receivable	7,700,892	$ 7,318,988
Financing receivable, at amortized cost or lower of cost or market		7,316,903
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	6,067,089	5,690,820
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,633,803	1,628,168
Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		5,442,307
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		111,157
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		139,744
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		1,597,188
Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		26,507
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	914,239
2019	849,986
2018	683,709
2017	1,129,197
2016	612,618
2015	1,126,535
Revolving loans amortized cost basis	750,805
Revolving loans converted to term	0
Total loans and leases receivable	6,067,089
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,950,300	1,909,274
Multi-family | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	139,734
2019	23,396
2018	305,351
2017	666,691
2016	296,204
2015	518,924
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,950,300	1,907,331
Multi-family | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		1,816,200
Multi-family | Pass/Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	139,734
2019	23,396
2018	305,351
2017	626,402
2016	271,981
2015	485,023
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,851,887
Multi-family | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		69,637
Multi-family | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	22,430
2016	10,424
2015	26,836
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	59,690
Multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		23,437
Multi-family | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	17,859
2016	13,799
2015	7,065
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	38,723
Multi-family | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Multi-family | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Multi-family | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	2,220,715	1,889,980
Commercial and industrial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	583,934
2019	429,191
2018	168,224
2017	134,898
2016	56,666
2015	99,452
Revolving loans amortized cost basis	748,350
Revolving loans converted to term	0
Total loans and leases receivable	2,220,715
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		1,841,074
Commercial and industrial | Pass/Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	564,313
2019	418,961
2018	153,659
2017	118,548
2016	48,470
2015	81,179
Revolving loans amortized cost basis	739,151
Revolving loans converted to term	0
Total loans and leases receivable	2,124,281
Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		26,285
Commercial and industrial | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13,200
2019	1,193
2018	222
2017	14,739
2016	112
2015	15,348
Revolving loans amortized cost basis	1,315
Revolving loans converted to term	0
Total loans and leases receivable	46,129
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		22,621
Commercial and industrial | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,421
2019	9,037
2018	14,343
2017	1,611
2016	8,084
2015	2,925
Revolving loans amortized cost basis	7,884
Revolving loans converted to term	0
Total loans and leases receivable	50,305
Commercial and industrial | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial and industrial | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial real estate owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	557,595	552,007
Commercial real estate owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,303
2019	185,921
2018	88,769
2017	81,045
2016	50,445
2015	104,371
Revolving loans amortized cost basis	741
Revolving loans converted to term	0
Total loans and leases receivable	557,595
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		536,777
Commercial real estate owner occupied | Pass/Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,303
2019	185,921
2018	88,291
2017	71,438
2016	48,202
2015	93,679
Revolving loans amortized cost basis	741
Revolving loans converted to term	0
Total loans and leases receivable	534,575
Commercial real estate owner occupied | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		8,286
Commercial real estate owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	478
2017	9,260
2016	0
2015	245
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	9,983
Commercial real estate owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		6,944
Commercial real estate owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	347
2016	2,243
2015	10,447
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	13,037
Commercial real estate owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Commercial real estate owner occupied | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial real estate owner occupied | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial real estate non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,215,516	1,223,529
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	135,589
2019	113,247
2018	116,794
2017	246,563
2016	199,535
2015	403,788
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,215,516
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		1,129,838
Commercial real estate non-owner occupied | Pass/Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	135,589
2019	113,247
2018	116,794
2017	225,952
2016	197,116
2015	346,107
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,134,805
Commercial real estate non-owner occupied | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		6,949
Commercial real estate non-owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	10,559
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	10,559
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		86,742
Commercial real estate non-owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	20,611
2016	2,419
2015	47,122
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	70,152
Commercial real estate non-owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Commercial real estate non-owner occupied | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Commercial real estate non-owner occupied | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	122,963	118,418
Construction | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,679
2019	98,231
2018	4,571
2017	0
2016	9,768
2015	0
Revolving loans amortized cost basis	1,714
Revolving loans converted to term	0
Total loans and leases receivable	122,963	117,617
Construction | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		118,418
Construction | Pass/Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,679
2019	98,231
2018	4,571
2017	0
2016	9,768
2015	0
Revolving loans amortized cost basis	1,714
Revolving loans converted to term	0
Total loans and leases receivable	122,963
Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Construction | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Construction | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Construction | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	0
Construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Construction | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	326,599
2019	808,077
2018	123,948
2017	17,877
2016	44,790
2015	147,657
Revolving loans amortized cost basis	164,855
Revolving loans converted to term	0
Total loans and leases receivable	1,633,803
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	335,452	375,014
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,514
2019	15,252
2018	7,807
2017	13,031
2016	44,233
2015	82,760
Revolving loans amortized cost basis	164,855
Revolving loans converted to term	0
Total loans and leases receivable	335,452	382,634
Residential real estate | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Residential real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		362,962
Residential real estate | Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,514
2019	15,252
2018	7,647
2017	12,246
2016	42,883
2015	78,365
Revolving loans amortized cost basis	161,575
Revolving loans converted to term	0
Total loans and leases receivable	325,482
Residential real estate | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		12,052
Residential real estate | Non-performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	160
2017	785
2016	1,350
2015	4,395
Revolving loans amortized cost basis	3,280
Revolving loans converted to term	0
Total loans and leases receivable	9,970
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	64,638	70,398
Manufactured housing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	307
2018	632
2017	79
2016	42
2015	63,578
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	64,638	71,359
Manufactured housing | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Manufactured housing | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Manufactured housing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Manufactured housing | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		63,250
Manufactured housing | Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	307
2018	632
2017	79
2016	42
2015	59,193
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	60,253
Manufactured housing | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		7,148
Manufactured housing | Non-performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	4,385
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	4,385
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,233,713	1,178,283
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	319,085
2019	792,518
2018	115,509
2017	4,767
2016	515
2015	1,319
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,233,713	1,174,175
Installment | Pass/Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Installment | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Installment | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		0
Installment | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		1,170,976
Installment | Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	318,780
2019	790,192
2018	115,024
2017	4,726
2016	513
2015	1,201
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	1,230,436
Installment | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable		$ 7,307
Installment | Non-performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	305
2019	2,326
2018	485
2017	41
2016	2
2015	118
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total loans and leases receivable	$ 3,277

Loans and Leases Receivable _11

Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loan Purchases and Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 15,700	$ 83,898	$ 225,963	$ 640,008
Sales	$ 21,568	$ 0	$ 23,390	$ 0
Purchase price as a percentage of loans outstanding	98.10%	96.30%	100.20%	99.40%
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 0	$ 0	$ 495	$ 105,858
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	17,600	0	17,600	0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	15,700	83,898	225,468	534,150
Sales	$ 0	$ 0	$ 1,822	$ 0

Leases - Lessee Narrative (Deta

Leases - Lessee Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	15 years		15 years
Operating cash flows from operating leases	$ 1.4	$ 1.4	$ 4.4	$ 4.2
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	2 months		2 months
Lessee, operating lease, term	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	7 years		7 years
Lessee, operating lease, term	5 years		5 years

Leases - Right-of-Use Assets an

Leases - Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Operating lease ROU assets	$ 18,419	$ 20,232
LIABILITIES
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Operating lease liabilities	$ 19,813	$ 21,358

Leases - Lease, Cost (Details)

Leases - Lease, Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 1,643,000	$ 1,470,000	$ 4,597,000	$ 4,400,000
Variable lease cost	$ 0	$ 0	$ 0	$ 0

Leases - Maturities of Non-canc

Leases - Maturities of Non-cancelable Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
2020	$ 2,610
2021	5,134
2022	4,653
2023	3,759
2024	2,673
Thereafter	3,026
Total minimum payments	21,855
Less: interest	2,042
Present value of lease liabilities	$ 19,813	$ 21,358

Leases - Summary of Lease Term

Leases - Summary of Lease Term and Discount Rate (Details)	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease, weighted average remaining lease term (years)	4 years 7 months 6 days	5 years
Operating lease, weighted average discount rate, percent	2.69%	2.90%

Leases - Lessor Narrative (Deta

Leases - Lessor Narrative (Details) $ in Millions	Sep. 30, 2020USD ($)
Minimum
Lessor, Lease, Description [Line Items]
Lessor, lease, term of contract (years)	24 months
Maximum
Lessor, Lease, Description [Line Items]
Lessor, lease, term of contract (years)	120 months
COVID-19 | Finance Leases
Lessor, Lease, Description [Line Items]
Book value	$ 31
COVID-19 | Operating Leases
Lessor, Lease, Description [Line Items]
Book value	$ 16

Leases - Lessor, Lease Receivab

Leases - Lessor, Lease Receivables and Investment in Operating Leases and their Corresponding Balance Sheet Location (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Direct financing leases
Lease receivables	$ 105,712	$ 91,762
Guaranteed residual assets	6,723	7,435
Unguaranteed residual assets	5,822	1,260
Deferred initial direct costs	654	721
Unearned income	(11,709)	(11,300)
Net investment in direct financing leases	107,202	89,878
Operating leases
Investment in operating leases	119,271	107,850
Accumulated depreciation	(24,973)	(14,251)
Deferred initial direct costs	1,070	1,052
Net investment in operating leases	95,368	94,651
Total lease assets	$ 202,570	$ 184,529

Borrowings - Short Term Borrowi

Borrowings - Short Term Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
FHLB advances	$ 850,000	$ 500,000
Federal funds purchased	680,000	538,000
Total short-term debt	$ 1,530,000	$ 1,038,000
FHLB advances, rate	1.24%	2.15%
Federal funds purchased, rate	0.14%	1.60%

Borrowings - Summary of Bancorp

Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
FHLB Advances
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 910,000	$ 1,190,150
Average balance during the period	$ 796,286	$ 793,304
Weighted-average interest rate during the period	2.17%	2.66%
Federal Funds Purchased
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 842,000	$ 600,000
Average balance during the period	$ 279,299	$ 271,400
Weighted-average interest rate during the period	0.20%	2.28%

Borrowings - Narrative (Detail)

Borrowings - Narrative (Detail) - USD ($) $ in Billions	Sep. 30, 2020	Dec. 31, 2019
Federal Funds Purchased
Debt Instrument [Line Items]
Aggregate availability under federal funds line	$ 0.5	$ 0.6

Borrowings - FHLB and FRB Advan

Borrowings - FHLB and FRB Advances (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
FHLB advances	$ 0	$ 350,000,000
FRB PPP Liquidity Facility advances	4,811,009,000	0
Total long-term debt	$ 4,811,009,000	$ 350,000,000
FHLB advances, interest rate	0.00%	2.36%
FRB PPP Liquidity Facility advances, interest rate	0.35%	0.00%
Total maximum borrowing capacity with the FHLB	$ 2,851,496,000	$ 3,445,416,000
Total maximum borrowing capacity with the FRB	214,766,000	136,842,000
Qualifying loans serving as collateral against FHLB and FRB advances	4,092,732,000	$ 4,496,983,000
Credit Facility, CARES Act
Debt Instrument [Line Items]
FRB PPP liquidity facility	4,800,000,000
Maximum borrowing capacity	$ 5,000,000,000

Borrowings - Long-term Debt (De

Borrowings - Long-term Debt (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amount	$ 4,811,009,000	$ 350,000,000
Senior Notes
Debt Instrument [Line Items]
Amount	123,935,000	123,630,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	181,324,000	181,115,000
Maturing September 2024 | Senior Notes
Debt Instrument [Line Items]
Amount	$ 24,522,000	24,432,000
Rate	4.50%
Issued Amount	$ 25,000,000
Price	100.00%
Maturing June 2022 | Senior Notes
Debt Instrument [Line Items]
Amount	$ 99,413,000	99,198,000
Rate	3.95%
Issued Amount	$ 100,000,000
Price	99.775%
Maturing December 2034 | Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	$ 72,176,000	72,040,000
Rate	5.375%
Issued Amount	$ 74,750,000
Price	100.00%
Maturing June 2029 | Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	$ 109,148,000	$ 109,075,000
Rate	6.125%
Issued Amount	$ 110,000,000
Price	100.00%
London Interbank Offered Rate (LIBOR) | Maturing June 2029 | Senior Subordinated Notes
Debt Instrument [Line Items]
Spread on variable interest rate	3.443%

Regulatory Capital - Summary of

Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital (to risk weighted assets), Actual Amount	$ 902,174	$ 821,810
Tier 1 capital (to risk weighted assets), Actual Amount	1,119,645	1,039,281
Total capital (to risk weighted assets), Actual Amount	1,361,237	1,256,309
Tier 1 capital (to average assets), Actual Amount	$ 1,119,645	$ 1,039,281
Common equity Tier 1 (to risk weighted assets), Actual Ratio	7.488%	7.984%
Tier 1 capital (to risk weighted assets), Actual Ratio	0.09293	0.10096
Total capital (to risk weighted assets), Actual Ratio	0.11298	0.12205
Tier 1 capital (to average assets), Actual Ratio	0.08534	0.09258
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	$ 542,199	$ 463,211
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	722,932	617,615
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount	963,909	823,487
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount	$ 524,799	$ 449,026
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio	4.50%	4.50%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	0.06000	0.06000
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	0.08000	0.08000
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio	0.04000	0.04000
Common equity Tier 1 (to risk weighted assets), for Basel III amount	$ 843,420	$ 720,551
Tier 1 (to risk weighted assets) Required for Basel III amount	1,024,153	874,955
Total capital (to risk weighted assets), for Basel III amount	1,265,130	1,080,827
Tier 1 (to risk average assets), for Basel III amount	$ 524,799	$ 449,026
Common equity Tier 1 (to risk weighted assets), for Basel III ratio	7.00%	7.00%
Tier 1 capital (to risk weighted assets), for Basel III ratio	8.50%	8.50%
Total capital (to risk weighted assets), for Basel III ratio	10.50%	10.50%
Tier 1 capital (to average assets), for Basel III ratio	4.00%	4.00%
Customers Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital (to risk weighted assets), Actual Amount	$ 1,217,159	$ 1,164,652
Tier 1 capital (to risk weighted assets), Actual Amount	1,217,159	1,164,652
Total capital (to risk weighted assets), Actual Amount	1,397,059	1,330,155
Tier 1 capital (to average assets), Actual Amount	$ 1,217,159	$ 1,164,652
Common equity Tier 1 (to risk weighted assets), Actual Ratio	10.12%	11.323%
Tier 1 capital (to risk weighted assets), Actual Ratio	0.10120	0.11323
Total capital (to risk weighted assets), Actual Ratio	0.11616	0.12933
Tier 1 capital (to average assets), Actual Ratio	0.09288	0.10379
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	$ 541,217	$ 462,842
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	721,622	617,122
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount	962,163	822,829
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount	$ 524,203	$ 448,851
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio	4.50%	4.50%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	0.06000	0.06000
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	0.08000	0.08000
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio	0.04000	0.04000
Common equity Tier 1 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 781,757	$ 668,549
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	962,163	822,829
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	1,202,704	1,028,537
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 655,254	$ 561,064
Common equity Tier 1 (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.08000	0.08000
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.10000	0.10000
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.05000	0.05000
Common equity Tier 1 (to risk weighted assets), for Basel III amount	$ 841,892	$ 719,976
Tier 1 (to risk weighted assets) Required for Basel III amount	1,022,298	874,256
Total capital (to risk weighted assets), for Basel III amount	1,262,839	1,079,964
Tier 1 (to risk average assets), for Basel III amount	$ 524,203	$ 448,851
Common equity Tier 1 (to risk weighted assets), for Basel III ratio	7.00%	7.00%
Tier 1 capital (to risk weighted assets), for Basel III ratio	8.50%	8.50%
Total capital (to risk weighted assets), for Basel III ratio	10.50%	10.50%
Tier 1 capital (to average assets), for Basel III ratio	4.00%	4.00%

Regulatory Capital - Narrative

Regulatory Capital - Narrative (Details)	Sep. 30, 2020
Regulatory Capital [Abstract]
Capital conservation buffer to risk weighted assets	2.50%

Disclosures About Fair Value _3

Disclosures About Fair Value of Financial Instruments - Narrative (Detail)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Loans held for sale, average life from purchase to sale	30 days

Disclosures About Fair Value _4

Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 331,416	$ 212,505
Cash and cash equivalents, Estimated Fair Value	331,416	212,505
Debt securities, available for sale	1,131,365	577,198
Debt securities, available for sale, Estimated Fair Value	1,131,365	577,198
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Carrying Amount		16,272
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value		16,272
Equity securities, Carrying Amount	2,466	2,406
Equity securities, Estimated Fair Value	2,466	2,406
Loans held for sale	26,689	486,328
Total loans and leases receivable, net of allowance for credit losses	16,423,029	9,508,367
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	17,070,867	9,853,037
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount	70,387	84,214
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	70,387	84,214
Derivative assets	60,810	23,608
Deposits, Carrying Amount	10,839,077	8,648,936
Deposits, Estimated Fair Value	10,843,133	8,652,340
FRB advances, Carrying Amount	4,811,009
FRB advances, Estimated Fair Value	4,811,009
Federal funds purchased, Carrying Amount	680,000	538,000
Federal funds purchased, Estimated Fair Value	680,000	538,000
FHLB advances, Carrying Amount	850,000	850,000
FHLB advances, Estimated Fair Value	854,104	852,162
Other borrowings, Carrying Amount	123,935	123,630
Other borrowings, Estimated Fair Value	102,594	127,603
Subordinated debt, Carrying Amount	181,324	181,115
Subordinated debt, Estimated Fair Value	178,958	192,217
Derivative liabilities	110,649	45,939
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	331,416	212,505
Debt securities, available for sale, Estimated Fair Value	0	0
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value		0
Equity securities, Estimated Fair Value	2,466	2,406
Loans held for sale	0	0
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	0	0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	0	0
Deposits, Estimated Fair Value	9,866,651	6,980,402
FRB advances, Estimated Fair Value	0
Federal funds purchased, Estimated Fair Value	680,000	538,000
FHLB advances, Estimated Fair Value	0	0
Other borrowings, Estimated Fair Value	0	0
Subordinated debt, Estimated Fair Value	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	0	0
Debt securities, available for sale, Estimated Fair Value	1,131,365	577,198
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value		0
Equity securities, Estimated Fair Value	0	0
Loans held for sale	6,998	2,130
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	3,913,593	2,245,758
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	70,387	84,214
Derivative assets	60,355	23,529
Deposits, Estimated Fair Value	976,482	1,671,938
FRB advances, Estimated Fair Value	4,811,009
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	854,104	852,162
Other borrowings, Estimated Fair Value	102,594	127,603
Subordinated debt, Estimated Fair Value	178,958	192,217
Derivative liabilities	110,649	45,939
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	0	0
Debt securities, available for sale, Estimated Fair Value	0	0
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value		16,272
Equity securities, Estimated Fair Value	0	0
Loans held for sale	19,691	484,198
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	13,157,274	7,607,279
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	455	79
Deposits, Estimated Fair Value	0	0
FRB advances, Estimated Fair Value	0
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	0	0
Other borrowings, Estimated Fair Value	0	0
Subordinated debt, Estimated Fair Value	0	0
Derivative liabilities	$ 0	$ 0

Disclosures About Fair Value _5

Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	$ 5,115,232	$ 2,867,372
Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	40,905	14,350
Interest-only GNMA securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		16,272
Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,466
Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	60,810	23,608
Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	6,998	2,130
Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	18,366
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	3,913,593	2,245,758
Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	110,649	45,939
Impaired loans, net of specific reserves
Assets
Related Allowance		852
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	22,539	14,272
Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure		78
Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	375,381
Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	40,008
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	61,079	278,321
Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	153,779
Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	18,259
Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	118,987
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	363,872	298,877
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		2,406
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,466	2,406
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest-only GNMA securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,466
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		2,406
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	5,112,311	2,848,615
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Interest-only GNMA securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		0
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Other Observable Inputs (Level 2) | Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	60,355	23,529
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	6,998	2,130
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	3,913,593	2,245,758
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	110,649	45,939
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure		0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	375,381
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	40,008
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	61,079	278,321
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	153,779
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	18,259
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	118,987
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	363,872	298,877
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	455	16,351
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	40,905	14,350
Significant Unobservable Inputs (Level 3) | Interest-only GNMA securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		16,272
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	455	79
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	18,366
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	22,539	14,272
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure		78
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	$ 0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		$ 0

Disclosures About Fair Value _6

Disclosures About Fair Value of Financial Instruments - Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) - Significant Unobservable Inputs (Level 3) - Residential Mortgage Loan Commitments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 52	$ 145	$ 79	$ 69
Issuances	455	150	722	372
Settlements	(52)	(145)	(346)	(291)
Balance at end of period	$ 455	$ 150	$ 455	$ 150

Disclosures About Fair Value _7

Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 131	$ 173
Interest-only GNMA securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest-only GNMA securities		$ 16,272
Interest-only GNMA securities | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		12.00%
Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		9.00%
Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	85.00%
Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest-only GNMA securities		$ 16,272
Other real estate owned		78
Residential mortgage loan commitments	$ 455	$ 79
Minimum | Interest-only GNMA securities | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		9.00%
Minimum | Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		8.00%
Minimum | Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	85.00%
Maximum | Interest-only GNMA securities | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		14.00%
Maximum | Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		9.00%
Maximum | Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	85.00%
Real Estate | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Real Estate | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		37.00%
Real Estate | Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 21,572	$ 12,767
Real Estate | Minimum | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Real Estate | Minimum | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		34.00%
Real Estate | Maximum | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	10.00%
Real Estate | Maximum | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		45.00%
Commercial and industrial | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Commercial and industrial | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	60.00%	22.00%
Commercial and industrial | Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 967	$ 1,505
Commercial and industrial | Minimum | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	7.00%	8.00%
Commercial and industrial | Minimum | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	60.00%	8.00%
Commercial and industrial | Maximum | Impaired loans, net of specific reserves | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Commercial and industrial | Maximum | Impaired loans, net of specific reserves | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	60.00%	50.00%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)swapnumberOfContracts	Dec. 31, 2019USD ($)numberOfContractsswap
Derivative Instruments, Gain (Loss) [Line Items]
Losses expected to be reclassified from AOCI during the next 12 months	$ 15,900
Length of hedging exposure to variability in future cash flows (months)	67 months
Derivative, net liability position, aggregate fair value	$ 114,500
Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	30 days
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	60 days
Not Designated as Hedging Instrument | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 19,400	$ 4,500
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	$ 110,039	$ 45,727
Interest Rate Swaps | Derivative Designated as Cash Flow Hedges | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Number of outstanding interest rate derivatives (derivative) | numberOfContracts	5	4
Aggregate notional amount	$ 1,100,000	$ 725,000
Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 1,400,000	$ 1,400,000
Number of interest rate swaps (swap) | swap	154	140
Interest Rate Cap | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 122,100	$ 78,600
Number of interest rate swaps (swap) | swap	6,000	4,000
Credit Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 172,900	$ 167,100

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 0	$ 432
Gross Amounts Recognized on the Consolidated Balance Sheets	110,039	45,727
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	0	0
Other Assets | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	60,810	23,608
Other Assets | Not Designated as Hedging Instrument | Residential real estate
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	455	79
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	59,962	23,301
Other Assets | Not Designated as Hedging Instrument | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	9	9
Other Assets | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	384	219
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	46,785	21,374
Other Liabilities | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	63,864	24,565
Other Liabilities | Not Designated as Hedging Instrument | Residential real estate
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	0	0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	63,340	24,797
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	9	9
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 515	$ (241)

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Net Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	$ (4,400)	$ (764)	$ (8,596)	$ (355)
Interest Expense | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	429	(3,821)	(24,602)	(19,391)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(4,400)	(764)	(8,596)	(355)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	952	55	(4,379)	373
Not Designated as Hedging Instrument | Other Non-interest Income | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	387	(35)	(6,191)	63
Not Designated as Hedging Instrument | Other Non-interest Income | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	0	0	0	0
Not Designated as Hedging Instrument | Other Non-interest Income | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	162	85	1,436	228
Not Designated as Hedging Instrument | Mortgage Banking Income | Residential Mortgage Loan Commitments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	$ 403	$ 5	$ 376	$ 82

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 0	$ 432
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral received	0	0
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 0	$ 432

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 110,039	$ 45,727
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	110,039	45,727
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 0	$ 0

Business Segments - Narrative (

Business Segments - Narrative (Details) - Segment	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Number of reportable segments (segment)	2
Operating Segments | BankMobile
Segment Reporting Information [Line Items]
Effective tax rate			23.15%
Forecast | Operating Segments | BankMobile
Segment Reporting Information [Line Items]
Effective tax rate		20.61%

Business Segments (Details)

Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Interest income	$ 139,650	$ 126,718	$ 390,212	$ 339,745
Interest expense	32,211	50,983	109,470	140,027
Net interest income	107,439	75,735	280,742	199,718
Provision for credit losses on loans and leases	12,955	4,426	65,688	14,539
Total non-interest income	33,793	23,369	77,959	55,125
Non-interest expense	65,561	59,592	195,525	173,160
Income before income tax expense	62,716	35,086	97,488	67,144
Income tax expense (benefit)	12,201	8,020	21,156	15,343
Net income (loss)	50,515	27,066	76,332	51,801
Preferred stock dividends	3,430	3,615	10,626	10,844
Net income (loss) available to common shareholders	47,085	23,451	65,706	40,957
Goodwill and other intangibles	14,437		14,437		$ 15,195
Total assets	18,778,727		18,778,727		11,520,717
Total deposits	10,839,077		10,839,077		$ 8,648,936
Operating Segments
Segment Reporting Information [Line Items]
Interest income	139,650	126,718	390,212	339,745
Interest expense	32,211	50,983	109,470	140,027
Net interest income	107,439	75,735	280,742	199,718
Provision for credit losses on loans and leases	12,955	4,426	65,688	14,539
Total non-interest income	33,793	23,369	77,959	55,125
Non-interest expense	65,561	59,592	195,525	173,160
Income before income tax expense	62,716	35,086	97,488	67,144
Income tax expense (benefit)	12,201	8,020	21,156	15,343
Net income (loss)	50,515	27,066	76,332	51,801
Preferred stock dividends	3,430	3,615	10,626	10,844
Net income (loss) available to common shareholders	47,085	23,451	65,706	40,957
Goodwill and other intangibles	14,437	15,521	14,437	15,521
Total assets	18,778,727	11,723,790	18,778,727	11,723,790
Total deposits	10,839,077	8,925,685	10,839,077	8,925,685
Total non-deposit liabilities	6,888,159	1,778,955	6,888,159	1,778,955
Operating Segments | Customers Bank Business Banking
Segment Reporting Information [Line Items]
Interest income	126,648	113,995	351,819	309,882
Interest expense	31,718	50,734	108,251	139,402
Net interest income	94,930	63,261	243,568	170,480
Provision for credit losses on loans and leases	8,699	2,475	55,620	3,245
Total non-interest income	21,603	11,757	44,422	20,304
Non-interest expense	48,926	38,347	137,055	111,840
Income before income tax expense	58,908	34,196	95,315	75,699
Income tax expense (benefit)	11,374	7,814	20,708	17,324
Net income (loss)	47,534	26,382	74,607	58,375
Preferred stock dividends	3,430	3,615	10,626	10,844
Net income (loss) available to common shareholders	44,104	22,767	63,981	47,531
Goodwill and other intangibles	3,629	3,629	3,629	3,629
Total assets	18,203,784	11,131,914	18,203,784	11,131,914
Total deposits	9,895,328	8,260,080	9,895,328	8,260,080
Total non-deposit liabilities	6,853,184	1,747,846	6,853,184	1,747,846
Operating Segments | BankMobile
Segment Reporting Information [Line Items]
Interest income	13,002	12,723	38,393	29,863
Interest expense	493	249	1,219	625
Net interest income	12,509	12,474	37,174	29,238
Provision for credit losses on loans and leases	4,256	1,951	10,068	11,294
Total non-interest income	12,190	11,612	33,537	34,821
Non-interest expense	16,635	21,245	58,470	61,320
Income before income tax expense	3,808	890	2,173	(8,555)
Income tax expense (benefit)	827	206	448	(1,981)
Net income (loss)	2,981	684	1,725	(6,574)
Preferred stock dividends	0	0	0	0
Net income (loss) available to common shareholders	2,981	684	1,725	(6,574)
Goodwill and other intangibles	10,808	11,892	10,808	11,892
Total assets	574,943	591,876	574,943	591,876
Total deposits	943,749	665,605	943,749	665,605
Total non-deposit liabilities	34,975	31,109	34,975	31,109
Segment Reconciling Items | BankMobile
Segment Reporting Information [Line Items]
Interest income	$ 2,200	$ 300	$ 5,300	$ 8,100

Non-Interest Revenues - Non-int

Non-Interest Revenues - Non-interest Revenues by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Non-interest income	$ 8,869	$ 11,779	$ 31,617	$ 35,370
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	4,081	6,869	17,368	22,435
Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	3,439	3,642	10,221	9,199
Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	(2,497)	638	(981)	1,770
BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	11,366	11,141	32,598	33,600
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Non-interest income	7,830	10,773	28,579	32,417
Transferred at Point in Time | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	4,081	6,869	17,368	22,435
Transferred at Point in Time | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	3,439	3,642	10,221	9,199
Transferred at Point in Time | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	310	262	990	783
Transferred at Point in Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	(2,497)	638	(981)	1,770
Transferred at Point in Time | Customers Bank Business Banking | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	(3,148)	181	(2,685)	580
Transferred at Point in Time | Customers Bank Business Banking | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	651	457	1,704	1,190
Transferred at Point in Time | Customers Bank Business Banking | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred at Point in Time | BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	10,327	10,135	29,560	30,647
Transferred at Point in Time | BankMobile | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	7,229	6,688	20,053	21,855
Transferred at Point in Time | BankMobile | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	2,788	3,185	8,517	8,009
Transferred at Point in Time | BankMobile | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	310	262	990	783
Transferred at Point in Time | BankMobile | Interchange and card revenue, difference between regulated and unregulated interchange rates
Disaggregation of Revenue [Line Items]
Non-interest income	(3,200)		3,200
Transferred over Time
Disaggregation of Revenue [Line Items]
Non-interest income	1,039	1,006	3,038	2,953
Transferred over Time | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	1,039	1,006	3,038	2,953
Transferred over Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred over Time | Customers Bank Business Banking | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred over Time | BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	1,039	1,006	3,038	2,953
Transferred over Time | BankMobile | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	$ 1,039	$ 1,006	$ 3,038	$ 2,953

Loss Contingencies - Narrative

Loss Contingencies - Narrative (Details) - USD ($) $ in Millions	Apr. 27, 2020	Jun. 21, 2019	Sep. 30, 2018	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2016
Bureau of the Fiscal Service
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 5.4
United States Department of Education Matter
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 6.5
Litigation settlement, amount awarded to other party	$ 3
Legal reserve				$ 1	$ 1
Higher One | United States Department of Education Matter
Loss Contingencies [Line Items]
Escrow deposit						$ 1

Bankmobile Technologies, Inc._2

Bankmobile Technologies, Inc. Merger - Narrative (Details) $ / shares in Units, $ in Thousands	Nov. 02, 2020numberOfContracts$ / shares	Dec. 31, 2020USD ($)$ / shares	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Merger [Line Items]
Total long-term debt			$ 4,811,009	$ 350,000
BM Technologies Inc.
Merger [Line Items]
Total long-term debt			$ 40,000
BankMobile Technologies, Inc. | Subsequent Event
Merger [Line Items]
Share price (in usd per share) | $ / shares	$ 12
Threshold trading days | numberOfContracts	20
Threshold consecutive trading days | numberOfContracts	30
Threshold period after closing date | numberOfContracts	150
Forecast | BM Technologies Inc.
Merger [Line Items]
Business combination, consideration		$ 140,000
Sponsor entity adjustment		9,300
Target net working capital		10,000
Cash reserve		10,000
Forecast | BankMobile Technologies, Inc.
Merger [Line Items]
Cash reserve		$ 5,000
Forecast | BankMobile Technologies, Inc.
Merger [Line Items]
Share price (in usd per share) | $ / shares		$ 10.38