Customers Bancorp (CUBI) 10-K 1 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Customers Bancorp, Inc.
Entity Central Index Key	1,488,813
Trading Symbol	CUBI
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		31,080,573
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 833,232,801

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 17,696	$ 20,388
Interest earning deposits	44,439	125,935
Cash and cash equivalents	62,135	146,323
Investment securities available for sale, at fair value	665,012	471,371
Loans held for sale (includes $1,507 and $1,886, respectively, at fair value)	1,507	146,077
Loans receivable, mortgage warehouse, at fair value	1,405,420	1,793,408
Loans receivable	7,138,074	6,768,258
Allowance for loan losses	(39,972)	(38,015)
Total loans receivable, net of allowance for loan losses	8,503,522	8,523,651
FHLB, Federal Reserve Bank, and other restricted stock	89,685	105,918
Accrued interest receivable	32,955	27,021
Bank premises and equipment, net	11,063	11,955
Bank-owned life insurance	264,559	257,720
Other real estate owned	816	1,726
Goodwill and other intangibles	16,499	16,295
Other assets	185,672	131,498
Total assets	9,833,425	9,839,555
Deposits:
Demand, non-interest bearing	1,122,171	1,052,115
Interest bearing	6,020,065	5,748,027
Total deposits	7,142,236	6,800,142
Federal funds purchased	187,000	155,000
FHLB advances	1,248,070	1,611,860
Other borrowings	123,871	186,497
Subordinated debt	108,977	108,880
Accrued interest payable and other liabilities	66,455	56,212
Total liabilities	8,876,609	8,918,591
Commitments and contingencies (NOTE 16)
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 December 31, 2018 and 2017	217,471	217,471
Common stock, par value $1.00 per share; 200,000,000 shares authorized; 32,252,488 and 31,912,763 shares issued as of December 31, 2018 and 2017; 31,003,028 and 31,382,503 shares outstanding as of December 31, 2018 and 2017	32,252	31,913
Additional paid in capital	434,314	422,096
Retained earnings	316,651	258,076
Accumulated other comprehensive loss, net	(22,663)	(359)
Treasury stock, at cost (1,249,460 and 530,260 shares as of December 31, 2018 and 2017)	(21,209)	(8,233)
Total shareholders’ equity	956,816	920,964
Total liabilities and shareholders’ equity	$ 9,833,425	$ 9,839,555

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Loans held for sale at fair value	$ 1,507	$ 1,886
Preferred stock, par value (usd per share)	$ 1	$ 1
Preferred stock, liquidation preference (usd per share)	$ 25	$ 25
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	9,000,000	9,000,000
Preferred stock, shares outstanding	9,000,000	9,000,000
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	32,252,488	31,912,763
Common stock, shares outstanding	31,003,028	31,382,503
Treasury stock, shares	1,249,460	530,260

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans	$ 373,234	$ 339,936	$ 302,818
Investment securities	33,209	25,153	14,293
Other	11,508	7,761	5,428
Total interest income	417,951	372,850	322,539
Interest expense:
Deposits	110,808	67,582	48,268
Other borrowings	11,486	10,056	6,438
FHLB advances	31,043	21,130	11,597
Subordinated debt	6,737	6,739	6,739
Total interest expense	160,074	105,507	73,042
Net interest income	257,877	267,343	249,497
Provision for loan losses	5,642	6,768	3,041
Net interest income after provision for loan losses	252,235	260,575	246,456
Non-interest income:
Bank-owned life insurance	7,620	7,219	4,736
Mortgage warehouse transactional fees	7,158	9,345	11,547
Commercial lease income	5,354	647	0
Gains on sale of SBA and other loans	3,294	4,223	3,685
Mortgage banking income	606	875	969
Impairment loss on investment securities	0	(12,934)	(7,262)
Gain (loss) on sale of investment securities	(18,659)	8,800	25
Other	15,106	9,187	9,922
Total non-interest income	58,998	78,910	56,370
Non-interest expense:
Salaries and employee benefits	104,841	95,518	80,641
Technology, communication and bank operations	44,454	45,885	26,839
Professional services	20,237	28,051	20,684
Occupancy	11,809	11,161	10,327
FDIC assessments, non-income taxes, and regulatory fees	8,642	7,906	13,097
Provision for operating losses	5,616	6,435	3,517
Merger and acquisition related expenses	4,391	410	1,195
Commercial lease depreciation	4,388	522	0
Advertising and promotion	2,446	1,470	1,549
Loan workout	2,183	2,366	2,063
Other real estate owned	449	570	1,953
Other	10,723	15,312	16,366
Total non-interest expense	220,179	215,606	178,231
Income before income tax expense	91,054	123,879	124,595
Income tax expense	19,359	45,042	45,893
Net income	71,695	78,837	78,702
Preferred stock dividends	14,459	14,459	9,515
Net income available to common shareholders	$ 57,236	$ 64,378	$ 69,187
Basic earnings per common share (usd per share)	$ 1.81	$ 2.10	$ 2.51
Diluted earnings per common share (usd per share)	$ 1.78	$ 1.97	$ 2.31
Interchange and card revenue
Non-interest income:
Revenue from contracts with customers	$ 30,695	$ 41,509	$ 24,681
Deposit fees
Non-interest income:
Revenue from contracts with customers	$ 7,824	$ 10,039	$ 8,067

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 71,695	$ 78,837	$ 78,702
Unrealized gains (losses) on available-for-sale securities:
Unrealized (losses) gains arising during the period	(46,069)	12,266	(3,335)
Income tax effect	11,978	(4,378)	1,317
Reclassification adjustments for losses (gains) included in net income	18,659	(8,800)	7,237
Income tax effect	(4,851)	3,432	(2,714)
Net unrealized (losses) gains on available-for-sale securities	(20,283)	2,520	2,505
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	1,995	666	(1,093)
Income tax effect	(518)	(260)	464
Reclassification adjustment for (gains) losses included in net income	(2,917)	2,634	1,946
Income tax effect	758	(1,027)	(730)
Net unrealized (losses) gains on cash flow hedges	(682)	2,013	587
Other comprehensive (loss) income, net of income tax effect	(20,965)	4,533	3,092
Comprehensive income	$ 50,730	$ 83,370	$ 81,794

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Preferred Stock	Preferred StockPreferred Stock	Common Stock	Common StockCommon Stock	Common StockAdditional Paid in Capital
Beginning balance at Dec. 31, 2015	$ 553,902	$ 55,569	$ 27,432	$ 362,607	$ 124,511	$ (7,984)	$ (8,233)
Beginning balance, preferred stock (shares) at Dec. 31, 2015		2,300,000
Beginning balance, common stock (shares) at Dec. 31, 2015			26,901,801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78,702				78,702
Other comprehensive income (loss)	3,092					3,092
Issuance of stock, net of offering costs								$ 161,902	$ 161,902	$ 64,031	$ 2,642	$ 61,389
Issuance of stock, net of offering costs (shares)									6,700,000		2,641,677
Preferred stock dividends	(9,515)				(9,515)
Share-based compensation expense	6,189			6,189
Exercise of warrants	1,531		$ 345	1,186
Exercise of warrants (shares)			345,414
Issuance of common stock under share-based-compensation arrangements	$ (3,962)		$ 401	(4,363)
Issuance of common stock under share-based-compensation arrangements (shares)			401,025
Repurchase of shares (shares)	0
Ending balance at Dec. 31, 2016	$ 855,872	$ 217,471	$ 30,820	427,008	193,698	(4,892)	(8,233)
Ending balance, preferred stock (shares) at Dec. 31, 2016		9,000,000
Ending balance, common stock (shares) at Dec. 31, 2016			30,289,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78,837				78,837
Other comprehensive income (loss)	4,533					4,533
Preferred stock dividends	(14,459)				(14,459)
Share-based compensation expense	6,088			6,088
Exercise of warrants	1,059		$ 74	985
Exercise of warrants (shares)			74,161
Issuance of common stock under share-based-compensation arrangements	$ (10,966)		$ 1,019	(11,985)
Issuance of common stock under share-based-compensation arrangements (shares)			1,018,425
Repurchase of shares (shares)	0
Ending balance at Dec. 31, 2017	$ 920,964	$ 217,471	$ 31,913	422,096	258,076	(359)	(8,233)
Ending balance, preferred stock (shares) at Dec. 31, 2017	9,000,000	9,000,000
Ending balance, common stock (shares) at Dec. 31, 2017	31,382,503		31,382,503
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 71,695				71,695
Other comprehensive income (loss)	(20,965)					(20,965)
Preferred stock dividends	(14,459)				(14,459)
Share-based compensation expense	8,605			8,605
Exercise of warrants	112		$ 5	107
Exercise of warrants (shares)			5,242
Issuance of common stock under share-based-compensation arrangements	$ 3,840		$ 334	3,506
Issuance of common stock under share-based-compensation arrangements (shares)			334,483
Repurchase of shares (shares)	(719,200)		(719,200)
Repurchase of shares	$ (12,976)						(12,976)
Ending 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, 2018	9,000,000	9,000,000
Ending balance, common stock (shares) at Dec. 31, 2018	31,003,028		31,003,028
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment | Accounting Standards Update 2018-02	$ 0				298	(298)
Cumulative effect adjustment | Accounting Standards Update 2016-01	$ 0				$ 1,041	$ (1,041)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Common Stock
Offering costs	$ 2,238
Preferred Stock
Offering costs	$ 5,598

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income	$ 71,695	$ 78,837	$ 78,702
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net of change to FDIC receivable and clawback liability	5,642	6,768	3,041
Depreciation and amortization	14,157	10,801	5,897
Share-based compensation expense	9,740	7,167	7,069
Deferred taxes	9,303	14,820	(2,579)
Net amortization of investment securities premiums and discounts	1,403	702	891
Unrealized loss recognized on equity securities	1,634	0	0
Loss (gain) on sale of investment securities	18,659	(8,800)	(25)
Impairment loss on investment securities	0	12,934	7,262
Gain on sale of SBA and other loans	(3,913)	(4,898)	(3,685)
Origination of loans held for sale	(31,699)	(41,172)	(39,750)
Proceeds from the sale of loans held for sale	32,676	40,656	42,772
Decrease in FDIC loss sharing receivable net of clawback liability	0	0	255
Amortization of fair value discounts and premiums	194	88	405
Net loss on sales of other real estate owned	183	154	130
Valuation and other adjustments to other real estate owned	153	298	1,473
Earnings on investment in bank-owned life insurance	(7,620)	(7,219)	(4,736)
Increase in accrued interest receivable and other assets	(34,614)	(32,256)	(11,538)
Increase (decrease) in accrued interest payable and other liabilities	9,881	(16,687)	5,819
Net Cash Provided by Operating Activities	97,474	62,193	91,403
Cash Flows from Investing Activities
Purchases of investment securities available for sale	(763,242)	(796,594)	(5,000)
Proceeds from maturities, calls and principal repayments on investment securities available for sale	44,313	48,124	64,701
Proceeds from sales of investment securities available for sale	476,182	769,203	2,852
Origination of mortgage warehouse loans	(27,209,330)	(30,084,255)	(36,091,174)
Proceeds from repayments of mortgage warehouse loans	27,597,318	30,407,662	35,729,309
Net decrease (increase) in loans	59,534	(960,372)	(794,954)
Purchase of loans	(397,888)	(262,641)	0
Proceeds from sale of loans	110,526	462,518	133,104
Purchases of bank-owned life insurance	0	(90,000)	0
Proceeds from bank-owned life insurance	529	1,418	619
Net proceeds from (purchases of) FHLB, Federal Reserve Bank, and other restricted stock	16,233	(37,510)	22,433
Payments to the FDIC on loss sharing agreements	0	0	(2,049)
Purchases of leased assets under operating leases	(37,207)	(22,223)	0
Purchases of bank premises and equipment	(1,777)	(2,135)	(5,426)
Proceeds from sales of other real estate owned	2,213	1,680	1,051
Acquisition and purchase of intangible assets	(1,502)	0	(17,000)
Net Cash Used in Investing Activities	(104,098)	(565,125)	(961,534)
Cash Flows from Financing Activities
Net increase (decrease) in deposits	342,094	(503,633)	1,394,276
Net (decrease) increase in short-term borrowed funds from the FHLB	(363,790)	743,060	(831,500)
Net increase in federal funds purchased	32,000	72,000	13,000
Proceeds from long-term FHLB borrowings	0	0	75,000
Repayments of long-term debt	(63,250)	0	0
Proceeds from issuance of long-term debt	0	98,564	0
Net proceeds from issuance of preferred stock	0	0	161,902
Preferred stock dividends paid	(14,459)	(14,459)	(9,051)
Exercise and redemption of warrants	112	1,059	1,532
Purchase of treasury stock	(12,976)	0	0
Payment of employee taxes withheld from share-based awards	(880)	(14,761)	(5,897)
Net proceeds from issuance of common stock	3,585	2,716	70,985
Net Cash (Used in) Provided by Financing Activities	(77,564)	384,546	870,247
Net (Decrease) Increase in Cash and Cash Equivalents	(84,188)	(118,386)	116
Cash and Cash Equivalents – Beginning	146,323	264,709	264,593
Cash and Cash Equivalents – Ending	62,135	146,323	264,709
Supplementary Cash Flow Information
Interest paid	160,384	101,575	71,216
Income taxes paid	4,794	40,282	57,251
Non-cash Items:
Transfer of loans to other real estate owned	1,639	750	703
Transfer of loans from held for investment to held for sale	0	150,638	0
Transfer of loans from held for sale to held for investment	$ 129,691	$ 0	$ 25,118

Description of the Business

Description of the Business	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	DESCRIPTION OF THE BUSINESS Customers Bancorp, Inc. (the “Bancorp” or “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. The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Customers Bancorp, Inc. and its wholly owned subsidiaries, Customers 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 provides liquidity to residential mortgage originators nationwide through commercial loans to mortgage companies. Through BankMobile, a division of Customers Bank, Customers 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. Customers 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	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies and Basis of Presentation	SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION Basis of Presentation The accounting and reporting policies of Customers Bancorp, Inc. and subsidiaries are in conformity with U.S. GAAP and predominant practices of the banking industry. The preparation of financial statements requires management to make estimates and assumptions that affect the reported balances of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for loan losses, credit deterioration and expected cash flows of purchased-credit-impaired loans, valuation of deferred tax assets, OTTI losses on securities, fair values of financial instruments, fair value of share-based compensation awards and annual goodwill and intangible asset impairment analysis. Principles of Consolidation The accompanying consolidated financial statements include the accounts of the parent company and its wholly owned subsidiaries, including Customers Bank, CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd., as well as Customers Bank's wholly owned subsidiaries, BankMobile Technologies, Inc., Customers Commercial Finance, LLC and Devon Service PA LLC. All significant intercompany balances and transactions have been eliminated in consolidation. Cash and Cash Equivalents and Statements of Cash Flows Cash and cash equivalents include cash on hand, amounts due from banks and interest-bearing deposits with banks with a maturity date of three months or less and are recorded at cost. The carrying value of cash and cash equivalents is a reasonable estimate of its approximate fair value. Changes in the balances of cash and cash equivalents are reported on the consolidated statements of cash flows. Cash receipts from the repayment or sale of loans are classified within the statement of cash flows based on management's original intent upon origination of the loan, as prescribed by accounting guidance related to the statement of cash flows. Commercial mortgage warehouse loans are classified as held for investment and presented at "Loans receivable, mortgage warehouse, at fair value" on the consolidated balance sheets and the cash flow activities associated with these commercial mortgage warehouse lending activities are reported as investing activities on the consolidated statements of cash flows. Restrictions on Cash and Amounts due from Banks Customers Bank is required to maintain average balances at a certain level of cash and amounts on deposit with the Federal Reserve Bank. Customers Bank generally maintains balances in excess of the required levels at the Federal Reserve Bank. At December 31, 2018 and 2017 , these required reserve balances were $58.4 million and $164.7 million , respectively. Business Combinations Business combinations are accounted for by applying the acquisition method in accordance with ASC 805, Business Combinations . Under the acquisition method, identifiable assets acquired and liabilities assumed are measured at their fair values as of the date of acquisition and are recognized separately from goodwill. The results of operations of the acquired entity are included in the consolidated statement of income from the date of acquisition. Customers recognizes goodwill when the acquisition price exceeds the estimated fair value of the net assets acquired. Investment Securities Customers acquires securities, largely mortgage-backed securities and corporate notes, to effectively utilize cash and capital and to generate earnings. Security transactions are recorded as of the trade date. Debt securities are classified at the time of acquisition as available for sale, HTM or trading, and their classification determines the accounting as follows: Available for sale : Investment securities classified as available for sale are those debt securities that Customers intends to hold for an indefinite period of time but not necessarily to maturity. Investment securities available for sale are carried at fair value. Unrealized gains or losses are reported as increases or decreases in AOCI, net of the related deferred tax effect. Realized gains or losses, determined on the basis of the cost of the specific securities sold, are included in earnings and recorded on the trade date. Premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Held to maturity : Investment securities classified as HTM are those debt securities that Customers has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or changes in general economic conditions. These securities are carried at cost, adjusted for the amortization of premiums and accretion of discounts, computed by a method which approximates the interest method over the terms of the securities. There were no securities classified as HTM as of December 31, 2018 and 2017 . Equity securities: Equity securities are carried at their fair value, with changes in fair value reported in income beginning in 2018. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments. For years ended December 31, 2017 and prior, equity securities were classified as available for sale and carried at fair value, with unrealized gains or losses reported as increases or decreases in AOCI, net of the related deferred tax effect. For available-for-sale and held-to-maturity debt securities, management periodically assesses whether the securities are other than temporarily impaired. OTTI means that management believes a security’s decline in fair value below its amortized cost basis is due to factors that could include the issuer’s inability to pay interest or dividends, its potential for default and/or other factors. When a held-to-maturity or available-for-sale debt security is assessed for OTTI, management has to first consider (a) whether Customers intends to sell the security, and (b) whether it is more likely than not that Customers will be required to sell the security prior to recovery of its amortized cost basis. If one of these circumstances applies to a security, an OTTI loss is recognized in the consolidated statements of income equal to the full amount of the decline in fair value below the amortized cost basis. If neither of these circumstances applies to a security, but Customers does not expect to recover the entire amortized cost basis, an OTTI has occurred that must be separated into two categories for debt securities: (a) the amount related to a credit loss and (b) the amount related to other factors. In determining the amount of OTTI attributable to credit loss, management compares the present value of cash flows expected to be collected to the amortized cost basis of the security. The portion of the total OTTI attributed to a credit loss is recognized in earnings (as the difference between the fair value and the present value of the estimated cash flows expected to be collected), while the amount related to all other factors is recognized in AOCI. The total OTTI loss is presented in the statement of income, less the portion recognized in AOCI. When a debt security becomes other-than-temporarily impaired, its amortized cost basis is reduced to reflect the portion of the total impairment related to credit loss. On January 1, 2018, Customers adopted the new accounting standard for financial instruments, which requires equity securities to be measured at fair value, except those accounted for under the equity method of accounting, with changes in fair value recognized in earnings in the period in which they occur and will no longer be deferred in AOCI. The adoption of this guidance resulted in an $1.0 million increase to beginning retained earnings and a $1.0 million decrease to beginning AOCI. Loan Accounting Framewor k The accounting for a loan depends on management’s strategy for the loan and on whether the loan was credit impaired at the date of acquisition. The Bank accounts for loans based on the following categories: • Loans held for sale, • Loans at fair value, • Loans receivable and • Purchased loans. The discussion that follows describes the accounting for loans in these categories. Loans Held for Sale and Loans at Fair Value Loans originated or acquired by Customers with the intent to sell them in the secondary market are carried either at the lower of cost or fair value, determined in the aggregate, or at fair value, depending upon an election made at the time the loan is originated. These loans are generally sold on a non-recourse basis with servicing released. Gains and losses on the sale of loans accounted for at the lower of cost or fair value are recognized in earnings based on the difference between the proceeds received and the carrying amount of the loans, inclusive of deferred origination fees and costs, if any. As a result of changes in events and circumstances or developments regarding management’s view of the foreseeable future, loans not originated or acquired with the intent to sell may subsequently be designated as held for sale. These loans are transferred to the held-for-sale portfolio at the lower of amortized cost or fair value. When the recorded investment of the loan exceeds its fair value at the date of transfer to the held-for-sale portfolio, the excess will be recognized as a charge against the allowance for loan losses to the extent the loan's reduction in fair value has already been provided for in the allowance for loan losses. Any subsequent lower of cost or fair value adjustments are recognized as a valuation allowance with charges recognized in non-interest income. Loans originated or acquired by Customers with the intent to sell them for which fair value accounting is elected are reported at fair value, with changes in fair value recognized in earnings in the period in which they occur. Upon sale, any difference between the proceeds received and the carrying amount of the loan is recognized in earnings. No fees or costs related to such loans are deferred, so they do not affect the gain or loss calculation at the time of sale. An allowance for loan losses is not maintained on loans designated as held for sale or reported at fair value. Loans Receivable - Mortgage Warehouse, at Fair Value Certain mortgage warehouse lending transactions subject to master repurchase agreements are designated as loans receivable, mortgage warehouse and reported at fair value based on an election made to account for the loans at fair value. Pursuant to these agreements, Customers funds the pipelines for these mortgage lenders by sending payments directly to the closing agents for funded loans and receives proceeds directly from third party investors when the loans are sold into the secondary market. Commercial warehouse mortgage loans are classified as held for investment and presented as "Loans receivable, mortgage warehouse, at fair value" on the consolidated balance sheets. An allowance for loan losses is not maintained on loans reported at fair value. Loans Receivable Loans receivable that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balances, net of an allowance for loan losses and any deferred fees. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the yield (interest income) of the related loans using the level-yield method without anticipating prepayments. Customers is generally amortizing these amounts over the contractual life of the loans. The accrual of interest is generally discontinued when the contractual payment of principal or interest has become 90 days past due or when management has doubts about further collectibility of principal or interest, even though the loan is currently performing. A loan may remain on accrual status if it is in the process of collection and is well secured. When a loan is placed on non-accrual status, unpaid accrued interest previously credited to income is reversed. Interest received on non-accrual loans is generally applied against principal until all principal has been recovered. Thereafter, payments are recognized as interest income until all unpaid amounts have been received. Generally, loans are restored to accrual status when the obligation is brought current and has performed in accordance with the contractual terms for a minimum of six months , and the ultimate collectibility of the total contractual principal and interest is no longer in doubt. Purchased Loans Customers believes that the varying circumstances under which it purchases loans and the diverse credit quality of loans purchased should drive the decision as to whether loans in a portfolio should be deemed to be PCI loans. Therefore, loan purchases are evaluated on a case-by-case basis to determine the appropriate accounting treatment. Loans acquired that do not have evidence of credit deterioration at the purchase date are accounted for in accordance with ASC 310-20, Nonrefundable Fees and Other Costs, and loans acquired with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are accounted for in accordance with ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Loans that are purchased that do not have evidence of credit deterioration Purchased performing loans are initially recorded at fair value and include credit and interest rate marks associated with acquisition accounting adjustments. Purchase premiums or discounts are subsequently amortized or accreted as an adjustment to yield over the estimated contractual lives of the loans. There is no allowance for loan losses established at the acquisition date for acquired performing loans. An allowance for loan losses is recorded for any credit deterioration in these loans subsequent to acquisition. Loans that are purchased that have evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected For these types of loan purchases, evidence of deteriorated credit quality may include past-due and non-accrual status, borrower credit scores and recent loan-to-value percentages. The fair value of loans with evidence of credit deterioration is recorded net of a nonaccretable difference and accretable yield. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is the nonaccretable difference that is not included in the carrying amount of acquired loans. Subsequent to acquisition, estimates of cash flows expected to be collected are updated each reporting period based on updated assumptions regarding default rates, loss severities and other factors that are reflective of current market conditions. Subsequent decreases in expected cash flows will generally result in a provision for loan losses. Subsequent increases in expected cash flows will result in a reversal of the provision for loan losses to the extent of prior charges or a reclassification of the difference from nonaccretable to accretable with a positive impact on accretion of interest income in future periods. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of those cash flows. PCI loans acquired in the same fiscal quarter may be aggregated into one or more pools, provided that the loans have similar risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. On a quarterly basis, Customers re-estimates the total cash flows (both principal and interest) expected to be collected over the remaining life of each pool. These estimates incorporate assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that reflect the then-current market conditions. If the timing and/or amounts of expected cash flows on PCI loans are determined not to be reasonably estimable, no interest is accreted, and the loans are reported as non-accrual loans; however, when the timing and amounts of expected cash flows for PCI loans are reasonably estimable, interest is accreted, and the loans are reported as performing loans. Allowance for Loan Losses The allowance for loan losses is established as losses that are estimated to have occurred and are recognized through provisions for loan losses. Loans deemed to be uncollectible are charged against the allowance for loan losses, and subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is maintained at a level considered appropriate to absorb probable incurred loan losses inherent in the loan portfolio as of the reporting date. Customers segments its loan portfolio into groups of loans with similar risk characteristics for purposes of estimating the allowance for loan losses. Customers' loan groups include multi-family, commercial and industrial, owner and non-owner occupied commercial real estate, construction, residential real estate, manufactured housing, other consumer and PCI loans. SBA loans are further segmented. Customers also further segments its residential real estate portfolio into two classes based upon certain risk characteristics: first-mortgage loans and home equity loans and lines of credit. The remaining loan groups are also considered classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Additionally, within each loan group the acquired loans that are accounted for under ASC 310-10 are further segmented. The total allowance for loan losses consists of an allowance for impaired loans, a general allowance for losses and may also include residual non-specific reserve amounts. The allowance for loan losses is maintained at a level considered adequate to provide for losses that are estimated to have been incurred. Management performs a quarterly assessment of the adequacy of the allowance for loan losses, which is based on Customers' past loan loss experience, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, composition of the loan portfolio, current economic conditions, peer and industry data and other relevant factors. This evaluation is inherently subjective as it requires material estimates that may be susceptible to significant revision as more information becomes available. Customers' current methodology for determining the allowance for loan losses is based on historical loss rates, peer and industry data, current economic conditions, risk ratings, allowances on loans identified as impaired and other qualitative adjustments as considered appropriate. The impaired-loan component of the allowance for loan losses generally relates to loans for which it is probable that Customers will be unable to collect all amounts due according to the contractual terms of the loan agreements. Customers analyzes certain loans in its portfolio for impairment in accordance with ASC 310-10-35. Customers' impaired loans generally include loans that have been (i) placed on non-accrual, (ii) restructured in a TDR, regardless of their payment status and (iii) charged-off to their net realizable value. For such loans, an allowance is established when the (i) discounted cash flows, (ii) collateral value or (iii) the impaired loan estimated fair value is lower than the carrying value of the loan. The general component of the allowance for loan losses covers groups of loans by loan class, including commercial loans not considered impaired, as well as smaller balance homogeneous loans, such as residential real estate, home equity loans, home equity lines of credit and other consumer loans. These pools of loans are evaluated for loss exposure based upon industry, peer or Customers' historical loss rates for each of these groups of loans. After determining the appropriate historical loss rate for each group of loans, management considers current qualitative or environmental factors that are likely to cause estimated credit losses as of the evaluation date to differ from the historical loss experience. The overall effect of these factors is recorded as an adjustment that, as appropriate, increases or decreases the historical loss rate applied to the loan group. The qualitative factors that management generally considers include the following: • National, regional and local economic and business conditions, including review of changes in the unemployment rate; • 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; • Changes in the values of collateral for collateral dependent loans; • Changes in the quality of the loan review system; • Experience, ability and depth of lending management and staff; and • Other external factors, such as changes in the legal, regulatory or competitive environment. A residual reserve may be maintained to cover uncertainties that could affect management’s estimate of probable losses. The residual reserve amount reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating credit losses in the loan portfolio. The discussion that follows describes Customers' underwriting policies for its primary lending activities and its credit monitoring and charge-off practices. Commercial and industrial loans are underwritten after evaluating historical and projected profitability and cash flow to determine the borrower’s ability to repay its obligation as agreed. Commercial and industrial loans are made primarily based on the identified cash flow of the borrower and secondarily on the underlying collateral supporting the loan facility. Accordingly, the repayment of a commercial and industrial loan depends primarily on the creditworthiness of the borrower (and any guarantors), while liquidation of collateral is a secondary and often insufficient source of repayment. Construction loans are underwritten based upon a financial analysis of the developers and property owners and construction cost estimates, in addition to independent appraisal valuations. These loans rely on the value associated with the project upon completion. These cost and valuation amounts used are estimates and may be inaccurate. Construction loans generally involve the disbursement of substantial funds over a short period of time with repayment substantially dependent upon the success of the completed project. Sources of repayment of these loans would be permanent financing upon completion or sales of the developed property. These loans are closely monitored by on-site inspections and are considered to be of a higher risk than other real estate loans due to their ultimate repayment being sensitive to general economic conditions, availability of long-term financing, interest-rate sensitivity and governmental regulation of real property. Commercial real estate and multi-family loans are subject to the underwriting standards and processes similar to commercial and industrial loans, in addition to those underwriting standards for real estate loans. These loans are viewed primarily as cash flow dependent and secondarily as loans secured by real estate. Repayment of these loans is generally dependent upon the successful operation of the property securing the loan, or the principal business conducted on the property securing the loan, to generate sufficient cash flows to service the debt. In addition, the underwriting considers the amount of the principal advanced relative to the property value. Commercial real estate and multi-family loans may be adversely affected by conditions in the real estate markets or the economy in general. Management monitors and evaluates commercial real estate and multi-family loans based on cash flow estimates, collateral valuation and risk-rating criteria. Customers also utilizes third-party experts to provide environmental and market valuations. Substantial effort is required to underwrite, monitor and evaluate commercial real estate and multi-family loans. Residential real estate loans are secured by one-to-four dwelling units. This group is further divided into first mortgage and home equity loans. First mortgages are originated at a loan to value ratio of 80% or less. Home equity loans have additional risks as a result of typically being in a second position or lower in the event collateral is liquidated. Manufactured housing loans are loans that are secured by the manufactured housing unit where the borrower may or may not own the underlying real estate and therefore have a higher risk than a residential real estate loan. Other consumer loans consist of loans to individuals originated through Customers' retail network or through purchases and are typically secured by personal property or are unsecured. Consumer loans have a greater credit risk than residential loans because of the difference in the underlying collateral, if any. The application of various federal and state bankruptcy and insolvency laws may limit the amount that can be recovered on such loans. Delinquency status and other borrower characteristics are used to monitor loans and identify credit risks, and the general reserves are established based on the expected net charge-offs, adjusted for qualitative factors. Charge-offs on commercial and industrial, construction, multi-family and commercial real estate loans are recorded when management estimates that there are insufficient cash flows to repay the contractual loan obligation based upon financial information available and valuation of the underlying collateral. Shortfalls in the underlying collateral value for loans determined to be collateral dependent are charged-off immediately. Customers also takes into account the strength of any guarantees and the ability of the borrower to provide value related to those guarantees in determining the ultimate charge-off or allowance associated with an impaired loan. Accordingly, Customers may charge-off a loan to a value below the net appraised value if it believes that an expeditious liquidation is desirable under the circumstance, and it has legitimate offers or other indications of interest to support a value that is less than the net appraised value. Alternatively, Customers may carry a loan at a value that is in excess of the appraised value in certain circumstances, such as when Customers has a guarantee from a borrower that Customers believes has realizable value. In evaluating the strength of any guarantee, Customers evaluates the financial wherewithal of the guarantor, the guarantor’s reputation and the guarantor’s willingness and desire to work with Customers. Customers then conducts a review of the strength of a guarantee on a frequency established as the circumstances and conditions of the borrower warrant. Customers records charge-offs for residential real estate, consumer and manufactured housing loans after 120 days of delinquency or sooner when cash flows are determined to be insufficient for repayment. Customers may also charge-off these loans below the net appraised valuation if Customers holds a junior-mortgage position in a piece of collateral whereby the risk to acquiring control of the property through the purchase of the senior-mortgage position is deemed to potentially increase the risk of loss upon liquidation due to the amount of time to ultimately market the property and the volatile market conditions. In such cases, Customers may abandon its junior mortgage and charge-off the loan balance in full. Estimates of cash flows expected to be collected for PCI loans are updated each reporting period. If Customers estimates decreases in expected cash flows to be collected after acquisition, Customers charges the provision for loan losses and establishes an allowance for loan losses. Credit Quality Factors Commercial and industrial, multi-family, commercial real estate and construction loans are each assigned a numerical rating of risk based on an internal risk-rating system. The risk rating is assigned at loan origination and indicates management's estimate of credit quality. Risk ratings are reviewed on a periodic or “as needed” basis. Residential real estate, manufactured housing and other consumer loans are evaluated primarily based on payment activity of the loan. Risk ratings are not established for residential real estate, home equity loans, manufactured housing loans 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 on aggregate payment history (through the monitoring of delinquency levels and trends). For additional information about credit quality factor ratings refer to NOTE 7 – LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES. Impaired Loans A loan is generally considered impaired when, based on current information and events, it is probable that Customers will be unable to collect all amounts due according to the contractual terms of the loan agreement. Customers' impaired loans generally include loans that have been (i) placed on non-accrual, (ii) restructured in a TDR, regardless of their payment status and (iii) charged-off to their net realizable value. Factors considered by management in determining impairment include payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is generally measured on a loan-by-loan basis for commercial and construction loans by the present value of expected future cash flows discounted at the loan’s original effective interest rate, the loan’s obtainable market price or the fair value of the collateral if the loan is collateral dependent. The fair value of the collateral is measured based on the value of the collateral securing the loans, less estimated costs to liquidate the collateral. Collateral may be in the form of real estate or business assets including equipment, inventory and accounts receivable. The vast majority of Customers' collateral is real estate. The value of real estate collateral is determined utilizing an income or market valuation approach based on an appraisal conducted by an independent, third-party licensed appraiser using observable market data. The value of business equipment is based upon an outside appraisal if deemed significant or the net book value on the applicable business’ financial statements if not considered significant, using observable market data. Similarly, values for inventory and accounts receivable collateral are based on financial statement balances or aging reports. Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the identifiable net assets of businesses acquired through business combinations accounted for under the acquisition method. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual o

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following are the components and results of Customers' earnings per common share calculations for the periods presented. For the Years Ended December 31, 2018 2017 2016 (amounts in thousands, except share and per share data) Net income available to common shareholders $ 57,236 $ 64,378 $ 69,187 Weighted-average number of common shares outstanding – basic 31,570,118 30,659,320 27,596,020 Share-based compensation plans 658,739 1,917,451 2,221,517 Warrants 4,241 19,906 196,113 Weighted-average number of common shares – diluted 32,233,098 32,596,677 30,013,650 Basic earnings per common share $ 1.81 $ 2.10 $ 2.51 Diluted earnings per common share 1.78 1.97 2.31 The following is a summary of 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. For the Years Ended December 31, 2018 2017 2016 Anti-dilutive securities: Share-based compensation plans 1,138,251 1,059,225 894,720 Warrants — — 52,242 Total anti-dilutive securities 1,138,251 1,059,225 946,962

Changes In Accumulated Other Co

Changes In Accumulated Other Comprehensive Income (Loss) By Component	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) By Component	CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT The following table presents the changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2018 and 2017 . All amounts are presented net of tax. Amounts in parentheses indicate reductions to AOCI. Available-for-Sale Securities (amounts in thousands) Unrealized Gains (Losses) Foreign Currency Items Total Unrealized Gains (Losses) Unrealized Gains (Losses) on Cash Flow Hedges Total Balance, December 31, 20 16 $ (2,681 ) $ — $ (2,681 ) $ (2,211 ) $ (4,892 ) Current period: Other comprehensive income before reclassifications 7,800 88 7,888 406 8,294 Amounts reclassified from accumulated other comprehensive income to net income (1) (5,368 ) — (5,368 ) 1,607 (3,761 ) Net current-period other comprehensive income 2,432 88 2,520 2,013 4,533 Balance, December 31, 2017 (249 ) 88 (161 ) (198 ) (359 ) Reclassification of the income tax effects of the Tax Cuts and Jobs Act (2) (256 ) — (256 ) (42 ) (298 ) Reclassification of the of net unrealized gains on equity securities (2) (953 ) (88 ) (1,041 ) — (1,041 ) Balance after reclassification adjustments on January 1, 2018 (1,458 ) — (1,458 ) (240 ) (1,698 ) Current period: Other comprehensive income (loss) before reclassifications (34,091 ) — (34,091 ) 1,477 (32,614 ) Amounts reclassified from accumulated other comprehensive income (loss) to net income (1) 13,808 — 13,808 (2,159 ) 11,649 Net current-period other comprehensive income (loss) (20,283 ) — (20,283 ) (682 ) (20,965 ) Balance, December 31, 2018 $ (21,741 ) $ — $ (21,741 ) $ (922 ) $ (22,663 ) (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. During the years ended December 31, 2018 and 2017 , reclassification amounts of $18.7 million ( $13.8 million net of taxes), and $8.8 million ( $5.4 million net of taxes) were reported as loss and gains on sale of investment securities on the consolidated statements of income, respectively. Impairment losses recorded during the year ended December 31, 2017 were not previously deferred in accumulated other comprehensive income (loss) because Customers decided to sell the securities as of December 31, 2016. Reclassification amounts for cash flow hedges are reported as either interest expense on FHLB advances on the consolidated statements of income or other non-interest income on the consolidated statements of income for gains recognized from the discontinuance of cash flow hedge accounting for certain interest rate swaps. During the year ended December 31, 2018 , a reclassification amount of $95 thousand ( $70 thousand net of taxes) was reported as a reduction to interest expense on FHLB advances on the consolidated statements of income. A reclassification amount of $2.8 million ( $2.1 million net of taxes) was reported as other non-interest income on the consolidated statements of income from the discontinuance of cash flow hedge accounting for certain interest rate swaps. During the year ended December 31, 2017, a reclassification amount of $2.6 million ( $1.6 million net of taxes) was reported as interest expense on FHLB advances on the consolidated statements of income. (2) Amounts reclassified from accumulated other comprehensive income (loss) on January 1, 2018 as a result of the adoption of ASU 2018-02 and ASU 2016-01 resulted in a decrease in accumulated other comprehensive income of $1.3 million and a corresponding increase in retained earnings for the same amount. See NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for more information.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES The amortized cost and approximate fair value of investment securities as of December 31, 2018 and 2017 , are summarized as follows: December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 311,267 $ — $ (5,893 ) $ 305,374 Corporate notes (1) 381,407 920 (24,407 ) 357,920 Available-for-sale debt securities $ 692,674 $ 920 $ (30,300 ) 663,294 Equity securities (2) 1,718 Total investment securities, at fair value $ 665,012 (1) Includes corporate securities issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity that are being measured at fair value with changes in fair value recognized directly in earnings effective January 1, 2018 as a result of adopting ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (see NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for additional information related to the adoption of this new standard). December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available-for-sale securities Agency-guaranteed residential mortgage-backed securities $ 186,221 $ 36 $ (2,799 ) $ 183,458 Agency-guaranteed commercial real estate mortgage-backed securities 238,809 432 (769 ) 238,472 Corporate notes (1) 44,959 1,130 — 46,089 Equity securities (2) 2,311 1,041 — 3,352 Total available-for-sale securities, at fair value $ 472,300 $ 2,639 $ (3,568 ) $ 471,371 (1) Includes subordinated debt issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity. The following table shows proceeds from the sale of available-for-sale securities, gross gains and gross losses on those sales of securities: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Proceeds from sale of available-for-sale securities $ 476,182 $ 769,203 $ 2,852 Gross gains $ — $ 8,808 $ 26 Gross losses (18,659 ) (8 ) (1 ) Net (losses) gains $ (18,659 ) $ 8,800 $ 25 These (losses)/gains were determined using the specific identification method and were reported as (loss) gain on sale of investment securities included in non-interest income on the consolidated statements of income. The following table shows available-for-sale debt securities by stated maturity. Debt securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and are, therefore, classified separately with no specific maturity date: December 31, 2018 Available for Sale Amortized Cost Fair Value (amounts in thousands) Due in one year or less $ — $ — Due after one year through five years — — Due after five years through ten years 329,096 308,578 Due after ten years 52,311 49,342 Agency-guaranteed residential mortgage-backed securities 311,267 305,374 Total available-for-sale debt securities $ 692,674 $ 663,294 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 December 31, 2018 and 2017 were as follows: December 31, 2018 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 305,374 $ (5,893 ) $ — $ — $ 305,374 $ (5,893 ) Corporate notes (1) 310,036 (24,407 ) — — 310,036 (24,407 ) Total $ 615,410 $ (30,300 ) $ — $ — $ 615,410 $ (30,300 ) (1) Includes corporate securities issued by other bank holding companies. December 31, 2017 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 104,861 $ (656 ) $ 66,579 $ (2,143 ) $ 171,440 $ (2,799 ) Agency-guaranteed commercial mortgage-backed securities 115,970 (740 ) 6,151 (29 ) 122,121 (769 ) Total $ 220,831 $ (1,396 ) $ 72,730 $ (2,172 ) $ 293,561 $ (3,568 ) At December 31, 2018 , there were twenty-six 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 on the mortgage-backed securities are guaranteed by government-sponsored entities and primarily relate to changes in market interest rates. The unrealized losses on the corporate notes relate to securities with no company specific concentration. The unrealized losses were due to an upward shift in interest rates that resulted in a negative impact on the respective notes' fair value. All amounts related to the mortgage-backed securities and the corporate notes are expected to be recovered when market prices recover or at maturity. Customers does not intend to sell these securities, and it is not more likely than not that Customers will be required to sell the securities before recovery of the amortized cost basis. During the year ended December 31, 2017 , Customers recorded OTTI losses of $12.9 million related to its equity holdings in Religare Enterprises, Ltd. ("Religare") for the full amount of the decline in fair value from the cost basis established at December 31, 2016 through September 30, 2017, because Customers no longer has the intent to hold these securities until a recovery in fair value. At December 31, 2017 , the fair value of the Religare equity securities was $3.4 million which resulted in an unrealized gain of $1.0 million being recognized in AOCI with no adjustment for deferred taxes as Customers did not have a tax strategy in place capable of generating sufficient capital gains to utilize any capital losses resulting from the Religare investment. At December 31, 2018 , Customers continues to not have a tax strategy in place capable of generating sufficient capital gains to utilize any capital losses resulting from the Religare impairment. As described in NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION, the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , on January 1, 2018 resulted in a cumulative effect adjustment to Customers' consolidated balance sheet with a $1.0 million reduction in AOCI and a corresponding increase in retained earnings related to the December 31, 2017 unrealized gain on the Religare equity securities. In accordance with the new accounting guidance, changes in the fair value of the Religare equity securities since adoption are recorded directly in earnings, which resulted in an unrealized loss of $1.6 million being recognized in other non-interest income in the accompanying consolidated statements of income for the year ended December 31, 2018 . At December 31, 2018 , the fair value of the Religare equity securities was $1.7 million . At December 31, 2018 and 2017 , Customers Bank had pledged investment securities with fair values aggregating to $23.0 million and $16.9 million , respectively, as collateral against its borrowings primarily with the FHLB and an unused line of credit with another financial institution. These counterparties do not have the ability to sell or repledge these securities. At December 31, 2018 , and 2017 , no securities holdings of any one issuer, other than the U.S. Government and its agencies, amounted to greater than 10% of shareholder's equity.

Loans Held for Sale

Loans Held for Sale	12 Months Ended
	Dec. 31, 2018
Receivables Held-for-sale [Abstract]
Loans Held for Sale	LOANS HELD FOR SALE The composition of loans held for sale as of December 31, 2018 and 2017 , was as follows: December 31, 2018 2017 (amounts in thousands) Commercial loans: Multi-family loans, at lower of cost or fair value $ — $ 144,191 Total commercial loans held for sale — 144,191 Consumer loans: Residential mortgage loans, at fair value 1,507 1,886 Loans held for sale $ 1,507 $ 146,077 Effective March 31, 2018, Customers Bank transferred $129.7 million of multi-family loans from loans held for sale to loans receivable (held for investment) because the Bank no longer has the intent to sell these loans. Customers Bank transferred these loans at their carrying value, which approximated their fair value at the time of transfer. Effective June 30, 2017, Customers Bank transferred $150.6 million of multi-family loans from loans receivable (held for investment) to loans held for sale. Customers Bank transferred these loans at their carrying value, which was lower than the estimated fair value at the time of transfer. At December 31, 2017, the carrying value of these loans approximates their fair value. Accordingly, a lower of cost or fair value adjustment was not recorded as of December 31, 2017. See NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for more information on the reclassification of loans previously reported as held for sale.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES The following table presents loans receivable as of December 31, 2018 and 2017 : December 31, 2018 2017 (amounts in thousands) Loans receivable, mortgage warehouse, at fair value $ 1,405,420 $ 1,793,408 Loans receivable: Commercial: Multi-family 3,285,297 3,502,381 Commercial and industrial (including owner occupied commercial real estate) 1,951,277 1,633,818 Commercial real estate non-owner occupied 1,125,106 1,218,719 Construction 56,491 85,393 Total commercial loans receivable 6,418,171 6,440,311 Consumer: Residential real estate 566,561 234,090 Manufactured housing 79,731 90,227 Other 74,035 3,547 Total consumer loans receivable 720,327 327,864 Loans receivable 7,138,498 6,768,175 Deferred (fees) costs and unamortized (discounts) premiums, net (424 ) 83 Allowance for loan losses (39,972 ) (38,015 ) Total loans receivable, net of allowance for loan losses $ 8,503,522 $ 8,523,651 Customers' total loans 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 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. 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 receivable 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 of 23 days from purchase to sale. The primary goal of these lending transactions is to provide liquidity to mortgage companies. At December 31, 2018 and 2017 , 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 allowance for loan loss and are therefore excluded from allowance for loan losses related disclosures. Loans receivable: The following tables summarize loans receivable by loan type and performance status as of December 31, 2018 and 2017 : December 31, 2018 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 (3) Total Loans (4) (amounts in thousands) Multi-family $ — $ — $ — $ 1,155 $ 3,282,452 $ 1,690 $ 3,285,297 Commercial and industrial 1,914 — 1,914 17,764 1,353,586 536 1,373,800 Commercial real estate owner occupied 193 — 193 1,037 567,809 8,438 577,477 Commercial real estate non-owner occupied 1,190 — 1,190 129 1,119,443 4,344 1,125,106 Construction — — — — 56,491 — 56,491 Residential real estate 5,940 — 5,940 5,605 550,679 4,337 566,561 Manufactured housing (5) 3,926 2,188 6,114 1,693 69,916 2,008 79,731 Other consumer 200 — 200 111 73,503 221 74,035 Total $ 13,363 $ 2,188 $ 15,551 $ 27,494 $ 7,073,879 $ 21,574 $ 7,138,498 December 31, 2017 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 (3) Total Loans (4) (amounts in thousands) Multi-family $ 4,900 $ — $ 4,900 $ — $ 3,495,600 $ 1,881 $ 3,502,381 Commercial and industrial 103 — 103 17,392 1,130,831 764 1,149,090 Commercial real estate owner occupied 202 — 202 1,453 472,501 10,572 484,728 Commercial real estate non-owner occupied 93 — 93 160 1,213,216 5,250 1,218,719 Construction — — — — 85,393 — 85,393 Residential real estate 7,628 — 7,628 5,420 215,361 5,681 234,090 Manufactured housing (5) 4,028 2,743 6,771 1,959 78,946 2,551 90,227 Other consumer 116 — 116 31 3,184 216 3,547 Total $ 17,070 $ 2,743 $ 19,813 $ 26,415 $ 6,695,032 $ 26,915 $ 6,768,175 (1) Includes past-due loans that are accruing interest because collection is considered probable. (2) Loans where next payment due is less than 30 days from the report date. (3) 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. (4) Amounts exclude deferred costs and fees, unamortized premiums and discounts, and the allowance for loan losses. (5) Manufactured housing loans purchased in 2010 are supported by cash reserves held at the Bank that are used to fund past-due payments when the loan becomes 90 days or more delinquent. Subsequent purchases are subject to varying provisions in the event of borrowers’ delinquencies. As of December 31, 2018 and 2017 , the Bank had $0.2 million and $0.3 million , respectively, of residential real estate held in OREO. As of December 31, 2018 and 2017 , the Bank had initiated foreclosure proceedings on $2.1 million and $1.6 million , respectively, in loans secured by residential real estate. Allowance for loan losses: The changes in the allowance for loan losses for the years ended December 31, 2018 and 2017 , and the loans and allowance for loan losses by loan type based on impairment-evaluation method are presented in the tables below. Twelve months ended December 31, 2018 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (amounts in thousands) Ending Balance, $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015 Charge-offs — (1,722 ) (747 ) — — (466 ) — (1,822 ) (4,757 ) Recoveries — 403 326 5 241 76 — 21 1,072 Provision for loan losses (706 ) 2,546 509 (1,349 ) (596 ) 1,115 (35 ) 4,158 5,642 Ending Balance, $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 As of December 31, 2018 Loans: Individually evaluated for impairment $ 1,155 $ 17,828 $ 1,069 $ 129 $ — $ 8,631 $ 10,195 $ 111 $ 39,118 Collectively evaluated for impairment 3,282,452 1,355,436 567,970 1,120,633 56,491 553,593 67,528 73,703 7,077,806 Loans acquired with credit deterioration 1,690 536 8,438 4,344 — 4,337 2,008 221 21,574 Total loans receivable $ 3,285,297 $ 1,373,800 $ 577,477 $ 1,125,106 $ 56,491 $ 566,561 $ 79,731 $ 74,035 $ 7,138,498 Allowance for loan losses: Individually evaluated for impairment $ 539 $ 261 $ 1 $ — $ — $ 41 $ 3 $ — $ 845 Collectively evaluated for impairment 10,923 11,516 3,319 4,161 624 3,227 89 2,390 36,249 Loans acquired with credit deterioration — 368 — 1,932 — 386 53 139 2,878 Allowance for loan losses $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 Twelve months ended December 31, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (amounts in thousands) Ending Balance, $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315 Charge-offs — (4,157 ) (731 ) (486 ) — (415 ) — (1,338 ) (7,127 ) Recoveries — 676 9 — 164 72 — 138 1,059 Provision for loan losses 566 3,349 1,771 29 (25 ) (70 ) (106 ) 1,254 6,768 Ending Balance, $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015 Loans: Individually evaluated for impairment $ — $ 17,461 $ 1,448 $ 160 $ — $ 9,247 $ 10,089 $ 30 $ 38,435 Collectively evaluated for impairment 3,500,500 1,130,865 472,708 1,213,309 85,393 219,162 77,587 3,301 6,702,825 Loans acquired with credit deterioration 1,881 764 10,572 5,250 — 5,681 2,551 216 26,915 Total loans receivable $ 3,502,381 $ 1,149,090 $ 484,728 $ 1,218,719 $ 85,393 $ 234,090 $ 90,227 $ 3,547 $ 6,768,175 Allowance for loan losses: Individually evaluated for impairment $ — $ 650 $ 642 $ — $ — $ 155 $ 4 $ — $ 1,451 Collectively evaluated for impairment 12,168 9,804 2,580 4,630 979 2,177 82 117 32,537 Loans acquired with credit deterioration — 464 10 2,807 — 597 94 55 4,027 Allowance for loan losses $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015 Certain manufactured housing loans were purchased in August 2010. A portion of the purchase price may be used to reimburse the Bank under the specified terms in the purchase agreement for defaults of the underlying borrower and other specified items. At December 31, 2018 and 2017 , funds available for reimbursement, if necessary, were $0.5 million and $0.6 million , respectively. Each quarter, these funds are evaluated to determine if they would be sufficient to absorb the probable incurred losses within the manufactured housing portfolio. Impaired Loans - Individually Evaluated for Impairment The following tables present the recorded investment (net of charge-offs), unpaid principal balance and related allowance by loan type for impaired loans that were individually evaluated for impairment as of December 31, 2018 and 2017 , and the average recorded investment and interest income recognized for the years ended December 31, 2018 , 2017 and 2016 . Purchased-credit-impaired loans are considered to be performing and are not included in the tables below. December 31, 2018 Twelve Months Ended, Recorded Investment Net of Charge Offs Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (amounts in thousands) With no related allowance recorded: Multi-family $ — $ — $ — $ 537 $ 8 Commercial and industrial 13,660 15,263 — 8,831 673 Commercial real estate owner occupied 1,037 1,766 — 776 19 Commercial real estate non-owner occupied 129 241 — 645 48 Residential real estate 4,842 5,128 — 4,129 151 Manufactured housing 10,027 10,027 — 10,015 561 Other consumer 111 111 — 89 1 With an allowance recorded: Multi-family 1,155 1,155 539 231 37 Commercial and industrial 4,168 4,351 261 6,504 25 Commercial real estate owner occupied 32 32 1 443 3 Residential real estate 3,789 3,789 41 4,566 131 Manufactured housing 168 168 3 214 14 Total $ 39,118 $ 42,031 $ 845 $ 36,980 $ 1,671 December 31, 2017 Twelve Months Ended, Twelve Months Ended, Recorded Investment Net of Charge Offs Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (amounts in thousands) With no related allowance recorded: Multi-family $ — $ — $ — $ — $ — $ 964 $ 53 Commercial and industrial 9,138 9,287 — 8,865 214 15,424 804 Commercial real estate owner occupied 806 806 — 1,439 70 7,963 426 Commercial real estate non-owner occupied 160 272 — 898 2 5,265 155 Residential real estate 3,628 3,801 — 4,617 24 4,567 120 Manufactured housing 9,865 9,865 — 10,003 558 8,961 465 Other consumer 30 30 — 51 — 47 — With an allowance recorded: Multi-family — — — — — 232 — Commercial and industrial 8,323 8,506 650 5,984 230 7,028 436 Commercial real estate owner occupied 642 642 642 882 — 173 — Commercial real estate non-owner occupied — — — — — 380 — Residential real estate 5,619 5,656 155 3,307 187 395 — Manufactured housing 224 224 4 131 8 — — Other consumer — — — — — 29 — Total $ 38,435 $ 39,089 $ 1,451 $ 36,177 $ 1,293 $ 51,428 $ 2,459 Troubled Debt Restructurings At December 31, 2018 , 2017 and 2016 , there were $19.2 million , $20.4 million and $16.4 million , respectively, in loans reported as TDRs. TDRs are reported as impaired loans in the calendar year of their restructuring and are evaluated to determine whether they should be placed on non-accrual status. In subsequent years, 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. Modifications of PCI loans that are accounted for within loan pools in accordance with the accounting standards for PCI loans do not result in the removal of these loans from the pool even if the modifications would otherwise be considered a TDR. Accordingly, as each pool is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows, modifications of loans within such pools are not considered TDRs. The following table presents total TDRs based on loan type and accrual status at December 31, 2018 , 2017 , and 2016 . Nonaccrual TDRs are included in the reported amount of total non-accrual loans. December 31, 2018 2017 2016 Accruing TDRs Nonaccrual TDRs Total Accruing TDRs Nonaccrual TDRs Total Accruing TDRs Nonaccrual TDRs Total (amounts in thousands) Commercial and industrial $ 64 $ 5,273 $ 5,337 $ 63 $ 5,939 $ 6,002 $ 73 $ 146 $ 219 Commercial real estate owner occupied 32 — 32 — — — 12 — 12 Commercial real estate non-owner occupied — — — — — — — 1,945 1,945 Residential real estate 3,026 667 3,693 3,828 703 4,531 4,012 707 4,719 Manufactured housing 8,502 1,620 10,122 8,130 1,766 9,896 7,429 2,072 9,501 Other consumer — 12 12 — — — — — — Total TDRs $ 11,624 $ 7,572 $ 19,196 $ 12,021 $ 8,408 $ 20,429 $ 11,526 $ 4,870 $ 16,396 The following table presents loans modified in a TDR by type of concession for the years ended December 31, 2018 , 2017 and 2016 . There were no modifications that involved forgiveness of debt for the years ended December 31, 2018 , 2017 and 2016 . For the Years Ended December 31, 2018 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Extensions of maturity 2 $ 60 5 $ 6,497 3 $ 1,995 Interest-rate reductions 39 1,615 35 1,574 61 4,621 Total 41 $ 1,675 40 $ 8,071 64 $ 6,616 The following table provides, by loan type, the number of loans modified in TDRs and the related recorded investment for the years ended December 31, 2018 , 2017 and 2016 . For the Years Ended December 31, 2018 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Commercial and industrial — $ — 4 $ 6,437 1 $ 76 Commercial real estate non-owner occupied — — — — 1 1,844 Residential real estate 2 352 — — 4 2,410 Manufactured housing 38 1,310 36 1,634 58 2,286 Other consumer 1 13 — — — — Total loans 41 $ 1,675 40 $ 8,071 64 $ 6,616 As of December 31, 2018 and 2017 , except for one commercial and industrial loan with an outstanding commitment of $1.5 million and $2.1 million , respectively, there were no other commitments to lend additional funds to debtors whose loans have been modified in TDRs. There were no commitments to lend additional funds to debtors whose terms were modified in TDRs at December 31, 2016 . As of December 31, 2018 , four manufactured housing loans totaling $0.1 million that were modified in TDRs within the past twelve months that defaulted on payments. As of December 31, 2017 , five manufactured housing loans totaling $0.2 million that were modified in TDRs within the past twelve months that defaulted on payments. As of December 31, 2016 , eight manufactured housing loans totaling $0.2 million , one commercial real estate non-owner occupied loan of $1.8 million and one residential real estate loan of $0.1 million that were modified in TDRs within the past twelve months defaulted on payments. 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 allowance for loan losses. For the year ended December 31, 2018 , there were no allowances recorded as a result of TDR modifications. For the year ended December 31, 2017 , there was one allowance resulting from TDR modifications totaling $1 thousand for one manufactured housing loan. There were no allowances recorded as a result of TDR modifications during 2016 . Purchased-Credit-Impaired Loans The changes in accretable yield related to PCI loans for the years ended December 31, 2018 , 2017 and 2016 , were as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Accretable yield balance, beginning of period $ 7,825 $ 10,202 $ 12,947 Accretion to interest income (1,455 ) (1,673 ) (3,760 ) Reclassification from nonaccretable difference and disposals, net (192 ) (704 ) 1,015 Accretable yield balance, end of period $ 6,178 $ 7,825 $ 10,202 Allowance for Loan Losses and the FDIC Loss Sharing Receivable and Clawback Liability In 2010, Customers acquired certain loans pursuant to FDIC-assisted transactions in which losses from resolution of the nonperforming loans were eligible for partial reimbursement by the FDIC. Subsequent to the purchase date, the expected cash flows on the covered loans were subject to evaluation. Decreases in the present value of expected cash flows on the covered loans were recognized by increasing the allowance for loan losses with a related charge to the provision for loan losses. At the same time, the FDIC loss sharing receivable balance was increased reflecting an estimated future collection from the FDIC, which was recorded as a reduction to the provision for loan losses. If the expected cash flows on the covered loans increased such that a previously recorded impairment could be reversed, Customers recorded a reduction in the allowance for loan losses (with a related credit to the provision for loan losses) accompanied by a reduction in the FDIC loss sharing receivable balance (with a related charge to the provision for loan losses). Increases in expected cash flows on covered loans and decreases in expected cash flows from the FDIC loss sharing receivable, when there were no previously recorded impairments, were considered together and recognized over the remaining life of the loans as interest income. Decreases in the valuations of OREO covered by the loss sharing agreements were recorded net of the estimated FDIC receivable as an increase to OREO expense (a component of non-interest expense). As part of the FDIC loss sharing agreements, Customers also assumed a potential liability to be paid within 45 days subsequent to the maturity or termination of the loss sharing agreements that was contingent upon actual losses incurred over the life of the agreements relative to the expected losses and the consideration paid upon acquisition of the failed institutions. Due to cash receipts on the covered assets in excess of the original expectations of the FDIC, Customers anticipated that it would be required to pay an amount to the FDIC at the end of the loss sharing agreements. Customers presented the FDIC Loss Sharing Receivable, net of the Clawback liability on the consolidated balance sheets. In the event the Clawback liability exceeded the FDIC Loss Sharing Receivable balance, the net liability amount was presented in "Accrued interest payable and other liabilities" on the consolidated balance sheets. On July 11, 2016, Customers entered into an agreement to terminate all existing rights and obligations pursuant to the loss sharing agreements with the FDIC. In connection with the termination agreement, Customers paid the FDIC $1.4 million as final payment under these agreements. The negotiated settlement amount was based on net losses incurred on the covered assets through September 30, 2015, adjusted for cash payments to and cash receipts from the FDIC as part of the December 31, 2015 and March 31, 2016 certifications. Consequently, loans and OREO previously reported as covered assets pursuant to the loss sharing agreements were no longer presented as covered assets as of June 30, 2016. The following table presents changes in the allowance for loans losses and the FDIC loss sharing receivable, including the effect of the estimated Clawback liability for the years ended December 31, 2018 , 2017 and 2016 . Allowance for Loan Losses For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Ending balance as of December 31, $ 38,015 $ 37,315 $ 35,647 Provision for loan losses (1) 5,642 6,768 3,330 Charge-offs (4,757 ) (7,127 ) (4,405 ) Recoveries 1,072 1,059 2,743 Ending balance as of December 31, $ 39,972 $ 38,015 $ 37,315 FDIC Loss Sharing Receivable For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Ending balance as of December 31, $ — $ — $ (2,083 ) Increased estimated cash flows (2) — — 289 Other activity, net (a) — — (255 ) Cash payments to the FDIC — — 2,049 Ending balance as of December 31, $ — $ — $ — (1) Provision for loan losses $ 5,642 $ 6,768 $ 3,330 (2) Effect attributable to FDIC loss sharing agreements — — (289 ) Net amount reported as provision for loan losses $ 5,642 $ 6,768 $ 3,041 (a) Includes external costs, such as legal fees, real estate taxes and appraisal expenses, that qualified for reimbursement under the loss sharing agreements. Credit Quality Indicators The allowance for loan losses represents management's estimate of probable losses in Customers' loans receivable portfolio, excluding commercial mortgage warehouse loans carried under the fair value option. 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 other consumer 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 for purposes of analyzing historical loss rates used in the determination of the allowance for loan losses for the respective loan portfolios, 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. The risk rating grades are defined as follows: “1” – Pass / Excellent Loans rated 1 represent a credit extension of the highest quality. The borrower’s historic (at least five years) cash flows manifest extremely large and stable margins of coverage. Balance sheets are conservative, well capitalized, and liquid. After considering debt service for proposed and existing debt, projected cash flows continue to be strong and provide ample coverage. The borrower typically reflects broad geographic and product diversification and has access to alternative financial markets. “2” – Pass / Superior Loans rated 2 are those for which the borrower has a strong financial condition, balance sheet, operations, cash flow, debt capacity and coverage with ratios better than industry norms. The borrowers of these loans exhibit a limited leverage position, are virtually immune to local economies, and are in stable growing industries. The management team is well respected, and the company has ready access to public markets. “3” – Pass / Strong Loans rated 3 are those loans for which the borrowers have above average financial condition and flexibility; more than satisfactory debt service coverage; balance sheet and operating ratios are consistent with or better than industry peers; operate in industries with little risk; move in diversified markets; and are experienced and competent in their industry. These borrowers’ access to capital markets is limited mostly to private sources, often secured, but the borrower typically has access to a wide range of refinancing alternatives. “4” – Pass / Good Loans rated 4 have a sound primary and secondary source of repayment. The borrower may have access to alternative sources of financing, but sources are not as widely available as they are to a higher-grade borrower. These loans carry a normal level of risk with very low loss exposure. The borrower has the ability to perform according to the terms of the credit facility. The margins of cash flow coverage are satisfactory but vulnerable to more rapid deterioration than the higher-quality loans. “5” – Satisfactory Loans rated 5 are extended to borrowers who are considered to be a reasonable credit risk and demonstrate the ability to repay the debt from normal business operations. Risk factors may include reliability of margins and cash flows, liquidity, dependence on a single product or industry, cyclical trends, depth of management, or limited access to alternative financing sources. The borrower’s historical financial information may indicate erratic performance, but current trends are positive and the quality of financial information is adequate, but is not as detailed and sophisticated as information found on higher grade loans. If adverse circumstances arise, the impact on the borrower may be significant. “6” – Satisfactory / Bankable with Care Loans rated 6 are those for which the borrower has higher than normal credit risk; however, cash flow and asset values are generally intact. These borrowers may exhibit declining financial characteristics, with increasing leverage and decreasing liquidity and may have limited resources and access to financial alternatives. Signs of weakness in these borrowers may include delinquent taxes, trade slowness and eroding profit margins. “7” – Special Mention Loans rated 7 are credit facilities that may have potential developing weaknesses and deserve extra attention from the account manager and other management personnel. In the event potential weaknesses are not corrected or mitigated, deterioration in the ability of the borrower to repay the debt in the future may occur. This grade is not assigned to loans that bear certain peculiar risks normally associated with the type of financing involved, unless circumstances have caused the risk to increase to a level higher than would have been acceptable when the credit was originally approved. Loans where significant actual, not potential, weaknesses or problems are clearly evident are graded in the category below. “8” – Substandard Loans are rated 8 when the loans are inadequately protected by the current sound worth and payment capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt and are characterized by the distinct possibility that the company will sustain some loss if the weaknesses are not corrected. “9” – Doubtful The Bank assigns a doubtful rating to loans that have all the attributes of a substandard rating with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The possibility of loss is extremely high, but because of certain important and reasonable specific pending factors that may work to the advantage of and strengthen the credit quality of the loan, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors may include a proposed merger or acquisition, liquidation proceeding, capital injection, perfecting liens on additional collateral or refinancing plans. “10” – Loss The Bank assigns a loss rating to loans considered uncollectible and of such little value that their continuance as an active asset is not warranted. Amounts classified as loss are immediately charged off. 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 receivable as of December 31, 2018 and 2017 . December 31, 2018 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (3) (amounts in thousands) Pass/Satisfactory $ 3,201,822 $ 1,306,466 $ 562,639 $ 1,054,493 $ 56,491 $ — $ — $ — $ 6,181,911 Special Mention 55,696 30,551 9,730 30,203 — — — — 126,180 Substandard 27,779 36,783 5,108 40,410 — — — — 110,080 Performing (1) — — — — — 555,016 71,924 73,724 700,664 Non-performing (2) — — — — — 11,545 7,807 311 19,663 Total $ 3,285,297 $ 1,373,800 $ 577,477 $ 1,125,106 $ 56,491 $ 566,561 $ 79,731 $ 74,035 $ 7,138,498 December 31, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (3) (amounts in thousands) Pass/Satisfactory $ 3,438,554 $ 1,118,889 $ 471,826 $ 1,185,933 $ 85,393 $ — $ — $ — $ 6,300,595 Special Mention 53,873 7,652 5,987 31,767 — — — — 99,279 Substandard 9,954 22,549 6,915 1,019 — — — — 40,437 Performing (1) — — — — — 221,042 81,497 3,400 305,939 Non-performing (2) — — — — — 13,048 8,730 147 21,925 Total $ 3,502,381 $ 1,149,090 $ 484,728 $ 1,218,719 $ 85,393 $ 234,090 $ 90,227 $ 3,547 $ 6,768,175 (1) Includes residential real estate, manufactured housing, and other consumer loans not subject to risk ratings. (2) Includes residential real estate, manufactured housing, and other consumer loans that are past due and still accruing interest or on nonaccrual status. (3) Excludes commercial mortgage warehouse loans carried under the fair value option. Loan Purchases and Sales Purchases and sales of loans were as follows for the years ended December 31, 2018, 2017 and 2016: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Purchases (1) Residential real estate $ 368,402 $ 264,090 $ — Other consumer 30,066 — — Total $ 398,468 $ 264,090 $ — Sales (2) Multi-family $ (54,638 ) $ (226,831 ) $ — Commercial and industrial (3) (32,263 ) (19,974 ) (23,731 ) Commercial real estate owner occupied (3) (20,218 ) (19,813 ) (15,342 ) Residential real estate — (191,574 ) — Other consumer — — — Total $ (107,119 ) $ (458,192 ) $ (39,073 ) (1) The purchase price was 99.9% and 99.4% of loans outstanding for the years ended December 31, 2018 and 2017 , respectively. There were no loan purchases during the year ended December 31, 2016 . (2) Loan sales resulted in a net gain of $3.3 million , $4.2 million and $3.7 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. (3) Primarily sales of SBA loans. N

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Bank Premises and Equipment	BANK PREMISES AND EQUIPMENT The components of bank premises and equipment as of December 31, 2018 and 2017 , were as follows: December 31, Expected Useful Life 2018 2017 (amounts in thousands) Leasehold improvements 3 to 25 years $ 14,080 $ 14,028 Furniture, fixtures and equipment 5 to 10 years 7,110 6,447 IT equipment 3 to 5 years 8,645 8,002 Automobiles 3 to 5 years 455 506 30,290 28,983 Accumulated depreciation and amortization (19,227 ) (17,028 ) Total $ 11,063 $ 11,955 Depreciation expense and amortization of leasehold improvements, which are included on the consolidated statements of income in occupancy expenses, were $2.7 million , $2.8 million and $2.5 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Future minimum rental commitments pursuant to non-cancelable leases as of December 31, 2018 , were as follows: December 31, 2018 (amounts in thousands) 2019 $ 5,577 2020 5,135 2021 4,513 2022 3,885 2023 2,856 Thereafter 4,699 Total minimum payments $ 26,665 Rent expense was approximately $5.8 million , $5.2 million and $4.7 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. A majority of the leases provide for the payment of taxes, maintenance, insurance and certain other expenses applicable to the leased premises. Many of the leases contain extension provisions and escalation clauses. These leases are generally renewable and may, in certain cases, contain renewal provisions and options to expand and contract space and terminate the leases at predetermined contractual dates. In addition, escalation clauses may exist, which are tied to a predetermined rate or may change based on a specified percentage increase or the Consumer Price Index.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Deposits	DEPOSITS The components of deposits at December 31, 2018 and 2017 , were as follows: December 31, 2018 2017 (amounts in thousands) Demand, non-interest bearing $ 1,122,171 $ 1,052,115 Demand, interest bearing 803,948 523,848 Savings, including money market deposit accounts 3,481,936 3,318,486 Time, $100,000 and over 792,370 1,284,855 Time, other 941,811 620,838 Total deposits $ 7,142,236 $ 6,800,142 The scheduled maturities for time deposits at December 31, 2018 , were as follows: December 31, 2018 (amounts in thousands) 2019 $ 1,459,919 2020 172,903 2021 81,148 2022 17,147 2023 3,064 Total time deposits $ 1,734,181 Time deposits greater than $250,000 totaled $0.5 billion and $0.8 billion at December 31, 2018 and 2017 , respectively. Included in the savings and MMDA balances above were $556.5 million and $654.8 million of brokered money market deposits at December 31, 2018 and 2017 , respectively. Also included in time, other balances above were $800.2 million and $504.3 million of brokered time deposits, respectively, at December 31, 2018 and 2017 . Demand deposit overdrafts reclassified as loans were $3.4 million and $2.0 million at December 31, 2018 and 2017 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Borrowings	BORROWINGS Short-term debt Short-term debt at December 31, 2018 and 2017 , was as follows: December 31, 2018 2017 Amount Rate Amount Rate (amounts in thousands) FHLB advances $ 1,248,070 2.62 % $ 1,611,860 1.47 % Federal funds purchased 187,000 2.60 % 155,000 1.50 % Total short-term debt $ 1,435,070 $ 1,766,860 The following is a summary of additional information relating to Customers' short-term debt: December 31, 2018 2017 2016 (amounts in thousands) FHLB advances Maximum outstanding at any month end $ 2,622,165 $ 2,283,250 $ 1,697,800 Average balance during the year 1,526,180 1,415,755 965,293 Weighted-average interest rate during the year 2.05 % 1.44 % 0.95 % Federal funds purchased Maximum outstanding at any month end 195,000 238,000 137,000 Average balance during the year 156,652 163,466 84,514 Weighted-average interest rate during the year 1.92 % 1.19 % 0.58 % At December 31, 2018 and 2017 , Customers Bank had aggregate availability under federal funds lines totaling $522.0 million and $310.0 million , respectively. Long-term debt FHLB advances Customers had a total maximum borrowing capacity with the FHLB of $4.1 billion and with the FRB of $102.5 million at December 31, 2018 . Customers had a total maximum borrowing capacity with the FHLB of $4.3 billion and with the FRB of $142.5 million at December 31, 2017 . Amounts can be borrowed as short-term or long-term. As of December 31, 2018 and 2017 , advances under these arrangements were secured by certain assets, which included qualifying loans of Customers Bank of $5.2 billion and $5.5 billion , respectively. Senior notes In July 2018, the 6.375% senior notes with an aggregate principal amount of $63.3 million issued by Customers Bancorp in July and August 2013 matured and were paid in full. In June 2017, Customers Bancorp issued $100 million of senior notes at 99.775% of face value. The price to purchasers represents a yield-to-maturity of 4.0% on the fixed coupon rate of 3.95% . The senior notes mature in June 2022. The net proceeds to Customers Bancorp after deducting the underwriting discount and offering expenses were $98.6 million . The net proceeds were contributed to Customers Bank for purposes of its working capital needs and the funding of its organic growth. On June 26, 2014, Customers Bancorp closed a private placement transaction in which it issued $25.0 million of 4.625% senior notes that will mature in June 2019. Interest is paid semi-annually in arrears in June and December. Subordinated debt On June 26, 2014, Customers Bank closed a private-placement transaction in which it issued $110.0 million of fixed-to-floating rate subordinated notes due in 2029. The subordinated notes bear interest at an annual fixed rate of 6.125% until June 26, 2024, and interest is paid semiannually. From June 26, 2024, the subordinated notes will bear an annual interest rate equal to three-month LIBOR plus 344.3 basis points until maturity on June 26, 2029. 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. The subordinated notes qualify as Tier 2 capital for regulatory capital purposes.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Common Stock During 2018 and 2017, Customers Bancorp did not issue any shares of its common stock pursuant to public offerings. During 2016, Customers Bancorp issued shares of its common stock pursuant to the following public offerings: On November 9, 2016, Customers Bancorp issued 2,415,000 shares of common stock at a price to the public of $25.00 per share as part of an underwritten public offering. Customers received proceeds of $58.3 million from the offering, after deducting offering costs. On August 11, 2016, Customers Bancorp entered into an At Market Issuance Sales Agreement with FBR Capital Markets & Co., Keefe, Bruyette & Woods, Inc. and Maxim Group LLC. Customers Bancorp has authorized the sale, at its discretion, of shares of its common stock, in an aggregate offering amount up to $50 million under the Sales Agreement. Customers issued 219,386 shares in connection with this Sales Agreement during 2016 receiving proceeds of $5.5 million , net of offering costs. The net proceeds from the common stock offerings was used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank. In November 2013, Customers Bancorp announced that its Board of Directors had authorized a stock repurchase plan in which it could acquire up to 5% of its current outstanding shares at prices not to exceed a 20% premium over the then current book value. In December 2018, Customers Bancorp announced that its Board of Directors amended the terms of the November 2013 stock repurchase plan to allow purchases to be made at prices not to exceed the book value per share of Customers' common stock measured as of September 30, 2018. The repurchase program may be suspended, modified or discontinued at any time, and the Bancorp has no obligation to repurchase any amount of its common stock under the program. In December 2018, Customers Bancorp repurchased 719,200 shares of its common stock at a weighted average price of $18.04 . There was no stock repurchased during 2017 or 2016. At December 31, 2018 , there were no warrants outstanding to purchase shares of Customers Bancorp’s common stock. At December 31, 2017 , there were 35,187 warrants outstanding to purchase shares of Customers Bancorp’s common stock at a price of $21.38 . Preferred Stock Customers Bancorp currently has four series of preferred stock outstanding. During 2018 and 2017, Customers Bancorp did not issue any preferred stock. Preferred stock issued during 2016 included the following: On September 16, 2016, Customers Bancorp issued 3,400,000 shares of Series F Preferred Stock par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series F Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.00% from the original issue date to, but excluding, December 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 4.762% per annum. Customers received proceeds of $82.2 million from the offering, after deducting offering costs. On April 28, 2016, Customers Bancorp issued 2,300,000 shares of Series E Preferred Stock par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series E Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.45% from the original issue date to, but excluding, June 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.14% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs. On January 29, 2016, Customers Bancorp issued 1,000,000 shares of Series D Preferred Stock par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series D Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.50% from the original issue date to, but excluding, March 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.09% per annum. Customers received proceeds of $24.1 million from the offering, after deducting offering costs. Preferred stock issued during 2015 included the following: On May 18, 2015, Customers Bancorp issued 2,300,000 shares of Series C Preferred Stock par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series C Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 7.00% from the original issue date to, but excluding, June 15, 2020, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.30% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs. The net proceeds from the preferred stock offerings were used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank. Dividends on the Series C, Series D, Series E and Series F Preferred Stock are not cumulative. If Customers Bancorp's board of directors or a duly authorized committee of the board does not declare a dividend on the Series C, Series D, Series E and Series F Preferred Stock in respect of a dividend period, then no dividend shall be deemed to have accrued for such dividend period, be payable on the applicable dividend payment date, or be cumulative, and Customers Bancorp will have no obligation to pay any dividend for that dividend period, whether or not the board of directors or a duly authorized committee of the board declares a dividend on the Series C, Series D, Series E, and Series F Preferred Stock for any future dividend period. The Series C, Series D, Series E and Series F Preferred Stock have no stated maturity, are not subject to any mandatory redemption, sinking fund or other similar provisions and will remain outstanding unless redeemed at Customers Bancorp's option. Customers Bancorp may redeem the Series C, Series D, Series E and Series F Preferred Stock at its option, at a redemption price equal to $25.00 per share, plus any declared and unpaid dividends (without regard to any undeclared dividends), (i) in whole or in part, from time to time, on any dividend payment date on or after June 15, 2020, for the Series C Preferred Stock, March 15, 2021, for the Series D Preferred Stock, June 15, 2021, for the Series E Preferred Stock and December 15, 2021, for the Series F Preferred Stock and or (ii) in whole but not in part, within 90 days following the occurrence of a regulatory capital treatment event. Any redemption of the Series C, Series D, Series E and Series F Preferred Stock is subject to prior approval of the Federal Reserve Board. The Series C, Series D, Series E and Series F Preferred Stock qualify as Tier 1 capital under regulatory capital guidelines. Except in limited circumstances, the Series C, Series D, Series E and Series F Preferred Stock do not have any voting rights. Preferred stock dividends paid during 2018 included the following: On December 17, 2018, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2018: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On September 17, 2018, Customers made the following dividend payments to preferred shareholders of record as of August 31, 2018: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On June 15, 2018, Customers made the following dividend payments to preferred shareholders of record as of May 31, 2018: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On March 15, 2018, Customers made the following dividend payments to preferred shareholders of record as of February 28, 2018: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. Preferred stock dividends paid during 2017 included the following: On December 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On September 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of August 31, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On June 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of May 31, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On March 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of February 28, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.375 per share. Preferred stock dividends paid during 2016 included the following: On December 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share; and • a cash dividend on its Series F Preferred Stock of $0.370833 per share. On September 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of August 31, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; and • a cash dividend on its Series E Preferred Stock of $0.403125 per share. On June 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of May 31, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; and • a cash dividend on its Series E Preferred Stock of $0.210521 per share. On March 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of February 29, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share and • a cash dividend on its Series D Preferred Stock of $0.2076 per share.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS 401(k) Plan Customers has a 401(k) profit sharing plan whereby eligible team members may contribute amounts up to the annual IRS statutory contribution limit. Customers provides a matching contribution equal to 50% of the first 6% of the contribution made by the team member. Employer contributions for the years ended December 31, 2018 , 2017 and 2016 , were $2.1 million , $1.9 million , and $1.6 million , respectively. Supplemental Executive Retirement Plan Customers entered into a SERP with its Chairman and CEO that provides annual retirement benefits for a 15 -year period upon the later of his reaching the age of 65 or when he terminates employment. The SERP is a defined-contribution type of deferred-compensation arrangement that is designed to provide a target annual retirement benefit of $300,000 per year for 15 years starting at age 65 , based on an assumed constant rate of return of 7% per year. The level of retirement benefit is not guaranteed by Customers, and the ultimate retirement benefit can be less than or greater than the target. Customers funds its obligations under the SERP with the increase in cash surrender value of a life insurance policy on the life of the Chairman and CEO which it owns. The present value of the amount owed as of December 31, 2018 and 2017 was $4.3 million and $4.6 million , respectively, and was included in other liabilities.

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Plans	SHARE-BASED COMPENSATION PLANS Summary During 2010, the shareholders of Customers Bancorp approved the 2010 Plan, and during 2012, the shareholders of Customers Bancorp approved the 2004 Plan. The purpose of these plans is to promote the success and enhance the value of Customers Bancorp by linking the personal interests of the members of the Board of Directors, team members, officers and executives of Customers to those of the shareholders of Customers and by providing such individuals with an incentive for outstanding performance in order to generate superior returns to shareholders of Customers. The 2010 Plan and 2004 Plan are intended to provide flexibility to Customers in its ability to motivate, attract and retain the services of members of the Board of Directors, team members, officers and executives of Customers. Stock options and restricted stock units normally vest on the third or fifth anniversary of the grant date provided the grantee remains employed by Customers or continues to serve on the Board. With respect to certain stock options granted under the 2010 Plan, vested options shall be exercisable only when Customers' fully diluted tangible book value will have increased by 50% from the date of grant. Share-based awards generally provide for accelerated vesting if there is a change in control (as defined in the Plans). No stock options may be exercisable for more than 10 years from the date of grant. The 2010 and 2004 Plans are administered by the Compensation Committee of the Board of Directors. The 2010 Plan provides exclusively for the grant of stock options, some or all of which may be structured to qualify as Incentive Stock Options, to team members, officers and executives. The maximum number of shares of common stock which may be issued under the 2010 Plan is 3,666,667 shares. The 2004 Plan provides for the grant of options, some or all of which may be structured to qualify as Incentive Stock Options if granted to team members, stock appreciation rights, restricted stock, restricted stock units and unrestricted stock to team members, officers, executives and members of the Board of Directors. The maximum number of shares of common stock which may be issued under the 2004 Plan is 2,750,000 shares. At December 31, 2018 , the aggregate number of shares of common stock available for grant under these plans was 1,311,743 shares. On January 1, 2011, Customers initiated a BRRP. This is a restricted stock unit plan. Team members eligible to participate in the BRRP include the CEO and other senior management and highly compensated team members as determined by the Compensation Committee at its sole discretion. Under the BRRP, a participant may elect to defer not less than 25% , nor more than 50% , of his or her bonus payable with respect to each year of participation. Shares of common stock having a value equal to the portion of the bonus deferred by a participant are allocated to an annual deferral account, and a matching amount equal to an identical number of shares of common stock is also allocated to the annual deferral account. A participant becomes 100% vested in the annual deferral account on the fifth anniversary date of the initial funding of the account, provided he or she remains continuously employed by Customers from the date of funding to the anniversary date. Vesting is accelerated in the event of involuntary termination other than for cause, retirement at or after age 65 , death, termination on account of disability or a change in control of Customers. Participants were first eligible to make elections under the BRRP with respect to their bonuses for 2011, which were payable in first quarter 2012. The BRRP does not provide for a specific number of shares to be reserved; by its terms, the award of restricted stock units under this plan is limited by the amount of cash bonuses paid to the participants in the plan. At December 31, 2018 , non-vested restricted stock units outstanding under this plan totaled 254,976 . Share-based-compensation expense relating to stock options and restricted stock units is recognized on a straight-line basis over the vesting periods of the awards and is a component of salaries and employee benefits expense. Total share-based- compensation expense for 2018 , 2017 and 2016 , was $8.6 million , $6.1 million and $6.2 million , respectively. At December 31, 2018 , there was $20.4 million of unrecognized compensation cost related to all non-vested share-based- compensation awards. This cost is expected to be recognized through December 2023 . In 2014, the shareholders of Customers Bancorp approved the 2014 ESPP. The ESPP is intended to encourage team member participation in the ownership and economic progress of Customers. This plan is intended to qualify as an ESPP within the meaning of the Internal Revenue Code and is administered by the Compensation Committee of the Board of Directors. Under the ESPP, team members may elect to purchase shares of Customers' common stock through payroll deduction. Because the purchase price under the plan is 85% of the fair market value of a share of common stock on the first day of each quarterly subscription period (a 15% discount to the market price), Customers' ESPP is considered to be a compensatory plan under current accounting guidance. Therefore, the entire amount of the discount is recognizable compensation expense. ESPP expense for 2018 , 2017 and 2016 was $141 thousand , $132 thousand , and $103 thousand , respectively. Stock Options Customers estimated the fair value of each option on the date of grant generally using the Black-Scholes option pricing model. The risk-free interest rate was based upon the zero-coupon Treasury rates in effect on the grant date of the options based on the expected life of the option. Expected volatility was based upon limited historical information because Customers' common stock has only been traded since February 2012. Expected life was management’s estimate which took into consideration the vesting requirement, generally three or five years. During 2018 , options to purchase an aggregate of 10,000 shares of Customers Bancorp voting common stock were granted to certain officers and team members. The exercise price for the options granted was equal to the closing price of Customers Bancorp's voting common stock on the date of grant. The options issued are subject to a three -year waterfall vesting and expire after ten years. The following table presents the weighted-average assumptions used and the resulting weighted-average fair value of each option granted for the periods presented. 2018 2017 2016 Weighted-average risk-free interest rate 2.87 % 2.35 % 1.84 % Expected dividend yield — % — % — % Weighted-average expected volatility 25.47 % 25.05 % 23.39 % Weighted-average expected life (in years) 7.00 7.00 7.00 Weighted-average fair value of each option granted $ 10.05 $ 8.68 $ 7.61 The following table summarizes stock option activity for the year ended December 31, 2018 : Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term in Years Aggregate Intrinsic Value (dollars in thousands, except weighted-average exercise price) Outstanding, December 31, 2017 2,718,694 $ 21.52 Granted 10,000 29.48 Exercised (197,918 ) 14.06 $ 3,123 Forfeited (10,250 ) 21.96 Outstanding, December 31, 2018 2,520,526 $ 22.13 6.40 $ 2,311 Exercisable at December 31, 2018 849,303 $ 16.29 3.68 $ 2,276 Cash received from the exercise of the stock options during the year ended December 31, 2018 was $2.8 million . The tax benefit realized for the tax deductions from option exercises totaled $0.7 million in 2018 . A summary of the status of Customers' non-vested options at December 31, 2018 , and changes during the year ended December 31, 2018 , is as follows: Options Weighted- Average exercise price Non-vested at December 31, 2017 2,621,731 $ 21.85 Granted 10,000 29.48 Vested (950,258 ) 16.22 Forfeited (10,250 ) 21.96 Non-vested at December 31, 2018 1,671,223 25.10 Restricted Stock Units The fair value of restricted stock units granted under the 2004 Plan is generally determined based on the closing market price of Customers' common stock on the date of grant. The fair value of restricted stock units granted under the BRRP is measured as of the date on which such portion of the bonus would have been paid had the deferral not been elected. Beginning in 2018, the Compensation Committee recommended and the Board of Directors approved a new compensation plan which incorporates performance metrics into the restricted stock awards for certain of Customers' key officers. Specifically, 40% of the restricted stock units granted as long term incentive compensation will vest ratably over three years. The remaining 60% will vest upon Customers meeting certain performance metrics, including total shareholder return, return on average common equity, and average NPAs to total assets over a three-year period relative to the performance of its peer group. The performance conditions are considered probable. There were 433,614 restricted stock units granted during the year ended December 31, 2018 . Of the aggregate restricted stock units granted, 17,373 were granted under the BRRP and are subject to five -year cliff vesting. The remaining 416,241 units were granted under the 2004 Plan and are subject to either a three -year waterfall vesting (with one third of the amount vesting annually) or a three-year cliff vesting, with 31,257 of those units also subject to the performance metrics described above. The table below presents the status of the restricted stock units at December 31, 2018 , and changes during the year ended December 31, 2018 : Restricted Stock Units Weighted- Average Grant- Date Fair Value Outstanding and unvested at December 31, 2017 590,036 $ 24.74 Granted 433,614 23.63 Vested (97,414 ) 25.66 Forfeited (41,577 ) 27.05 Outstanding and unvested at December 31, 2018 884,659 23.99 Customers has a policy that permits its directors to elect to receive shares of common stock in lieu of their cash retainers. During the year ended December 31, 2018 , Customers issued 37,377 shares of common stock with a fair value of $1.0 million to the directors as compensation for their services. The fair values were generally determined based on the closing price of the common stock the day before the shares were issued.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The components of income tax expense were as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Current $ 10,056 $ 29,924 $ 48,472 Deferred 9,303 15,118 (2,579 ) Income tax expense $ 19,359 $ 45,042 $ 45,893 Effective tax rates differ from the federal statutory rate of 21% at December 31, 2018 , and at 35% at December 31, 2017 and 2016 , which was applied to income before income tax expense, due to the following: For the Years Ended December 31, 2018 2017 2016 Amount % of pretax income Amount % of pretax income Amount % of pretax income (amounts in thousands) Federal income tax at statutory rate $ 19,121 21.00 % $ 43,357 35.00 % $ 43,608 35.00 % State income tax, net of federal benefit 4,067 4.47 3,835 3.10 4,548 3.65 Tax-exempt interest, net of disallowance (360 ) (0.40 ) (381 ) (0.31 ) (237 ) (0.19 ) Bank-owned life insurance (1,547 ) (1.70 ) (2,675 ) (2.16 ) (1,716 ) (1.38 ) Equity-based compensation (547 ) (0.60 ) (10,741 ) (8.67 ) (3,659 ) (2.94 ) Non-deductible executive compensation 230 0.25 654 0.53 — — Unrecorded basis difference in foreign subsidiaries 343 0.38 4,527 3.65 2,830 2.27 Enactment of federal tax reform (21 ) (0.02 ) 5,505 4.44 — — Other (1,927 ) (2.12 ) 961 0.78 519 0.42 Effective income tax rate $ 19,359 21.26 % $ 45,042 36.36 % $ 45,893 36.83 % Customers accounts for income taxes under the liability method of accounting for income taxes. The income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. Customers determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur. A tax position is recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent ; the terms examined and upon examination also include resolution of the related appeals or litigation process, if any. A tax position that meets the more likely than not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more likely than not recognition threshold considers the facts, circumstances and information available at the reporting date and is subject to management’s judgment. At December 31, 2018 and 2017 , Customers had no ASC 740-10 unrecognized tax benefits. Customers does not expect the total amount of unrecognized tax benefits to significantly increase within the next twelve months. Customers recognizes interest and penalties on unrecognized tax benefits in other expense. Realization of deferred tax assets is dependent upon the generation of future taxable income or the existence of sufficient taxable income within the carry-back period. A valuation allowance is provided when it is more likely than not that some portion of the deferred tax assets will not be realized. In assessing the need for a valuation allowance, management considers the scheduled reversal of the deferred tax liabilities, the level of historical taxable income and the projected future taxable income over the periods in which the temporary differences comprising the deferred tax assets will be deductible. Based on its assessment, management determined that no valuation allowance was necessary at December 31, 2018 and 2017 . On December 22, 2017, H.R.1, commonly known as the Tax Cuts and Jobs Act, was signed into law. The Tax Act includes many provisions that affected Customers' income tax expenses, including reducing its corporate federal tax rate from 35% to 21% effective January 1, 2018. As a result of the rate reduction, Customers was required to re-measure, through income tax expense in the period of enactment, its deferred tax assets and liabilities using the enacted rate at which Customers expected them to be recovered or settled. The re-measurement of the net deferred tax asset resulted in additional income tax expense of $5.5 million during fourth quarter 2017. Also on December 22, 2017, the SEC released SAB 118 to address any uncertainty or diversity of views in practice in accounting for the income tax effects of the Tax Act in situations where a registrant does not have the necessary information available, prepared or analyzed in reasonable detail to complete this accounting in the reporting period that includes the enactment date. SAB 118 allowed for a measurement period not to extend beyond one year from the Tax Act’s enactment date to complete the necessary accounting. Customers recorded provisional amounts of deferred income taxes using reasonable estimates in three areas where information necessary to complete the accounting was not available, prepared or analyzed as follows: (i) the deferred tax liability for temporary differences between the tax and financial reporting bases of fixed assets principally due to the accelerated depreciation under the Tax Act which allowed for full expensing of qualified property purchased and placed in service after September 27, 2017; (ii) the deferred tax asset for temporary differences associated with accrued compensation was awaiting final determinations of amounts that were paid and deducted on the 2017 income tax returns and (iii) the deferred tax liability for temporary differences associated with equity investments in partnerships were awaiting receipt of Schedules K-1 from outside preparers, which was necessary to determine the 2017 tax impact from these investments. In a fourth area, Customers made no adjustments to deferred tax assets representing future deductions for accrued compensation that were subject to new limitations under Internal Revenue Code Section 162(m) which, generally, limits the annual deduction for certain compensation paid to certain team members to $1 million . There was uncertainty in applying the newly enacted rules to existing contracts, and Customers was seeking further clarifications before completing its analysis. Customers completed the calculations for the provisional items with the completion of the 2017 tax returns and completed the analysis of the Section 162(m) rules after further guidance was issued. The impact of the completed calculations to the re-measurement of the deferred taxes resulted in an immaterial change and the analysis of the 162(m) rules resulted in no adjustment. Deferred income taxes reflect temporary differences in the recognition of revenue and expenses for tax reporting and financial statement purposes, principally because certain items are recognized in different periods for financial reporting and tax return purposes. The following represents Customers' deferred tax asset and liabilities as December 31, 2018 and 2017 : December 31, 2018 2017 (amounts in thousands) Deferred tax assets Allowance for loan losses $ 10,449 $ 9,738 Net unrealized losses on securities 7,639 512 OREO write-downs 91 748 Non-accrual interest 539 515 Net operating losses 1,212 1,199 Deferred compensation 1,129 1,181 Equity-based compensation 4,049 2,748 Cash flow hedge 324 84 Incentive compensation 1,056 634 Net deferred loan fees 671 47 Other 3,028 2,215 Total deferred tax assets 30,187 19,621 Deferred tax liabilities Fair value adjustments on acquisitions (569 ) (618 ) Bank premises and equipment (884 ) (986 ) Lease adjustments (17,786 ) (4,899 ) Other (746 ) (980 ) Total deferred tax liabilities (19,985 ) (7,483 ) Net deferred tax asset $ 10,202 $ 12,138 Customers had approximately $5.2 million of federal and state net operating loss carryovers subject to the annual limitation under Internal Revenue code Section 382 at December 31, 2018, that begin to expire in 2027. Customers also has state net operating loss carryovers for some states that begin to expire in 2037. Customers is subject to U.S. federal income tax as well as income tax in various state and local taxing jurisdictions. Generally, Customers is no longer subject to examination by federal, state, and local taxing authorities for years prior to the year ended December 31, 2015.

Transactions with Executive Off

Transactions with Executive Officers, Directors, and Principal Shareholders	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Transactions with Executive Officers, Directors, and Principal Shareholders	TRANSACTIONS WITH EXECUTIVE OFFICERS, DIRECTORS AND PRINCIPAL SHAREHOLDERS Customers has had, and may be expected to have in the future, banking transactions in the ordinary course of business with its executive officers, directors, principal shareholders, their immediate families and affiliated companies (commonly referred to as related parties). The activity relating to loans to such persons was as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Balance as of December 31, $ — $ 238 $ 220 Additions 27 99 1,160 Repayments (22 ) (337 ) (1,142 ) Balance as of December 31, $ 5 $ — $ 238 As of December 31, 2018 and 2017 , Customers Bank had an outstanding commitment to a related party to provide a letter of credit in the amount of $0.5 million . As of December 31, 2017 , Customers Bank had an outstanding commitment to one of its related parties to provide short-term commercial real estate financing, subject to certain terms and conditions, not to exceed $8.0 million . Some current directors, nominees for director and executive officers of Customers and entities or organizations in which they were executive officers or the equivalent or owners of more than 10% of the equity, were customers of and had transactions with or involving Customers in the ordinary course of business during the fiscal year ended December 31, 2018 . None of these transactions involved amounts in excess of 5% of Customers' gross revenues during 2018 , nor was Customers indebted to any of the foregoing persons or entities in an aggregate amount in excess of 5% of Customers' total assets at December 31, 2018 . Additional transactions with such persons and entities may be expected to take place in the ordinary course of business in the future. At December 31, 2018 and 2017 , Customers had approximately $15.3 million and $10.6 million , respectively, in deposits from related parties, including directors and certain executive officers.

Financial Instruments with Off-

Financial Instruments with Off-Balance-Sheet Risk	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Financial Instruments with Off-Balance-Sheet Risk	FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK Customers is involved with financial instruments and other commitments with off-balance sheet risks. Financial instruments with off-balance sheet risks are incurred in the normal course of business to meet the financing needs of the Bank's customers. These financial instruments include commitments to extend credit, including unused portions of lines of credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized on the balance sheets. With commitments to extend credit, exposures to credit loss in the event of non-performance by the other party to the financial instrument is represented by the contractual amount of those instruments. The same credit policies are used in making commitments and conditional obligations as for on-balance sheet instruments. Since they involve credit risk similar to extending a loan, commitments to extend credit are subject to the Bank’s credit policy and other underwriting standards. As of December 31, 2018 and 2017 , the following off-balance sheet commitments, financial instruments and other arrangements were outstanding: December 31, 2018 2017 (amounts in thousands) Commitments to fund loans $ 345,608 $ 333,874 Unfunded commitments to fund mortgage warehouse loans 1,537,900 1,567,139 Unfunded commitments under lines of credit and credit cards 867,131 485,345 Letters of credit 55,659 39,890 Other unused commitments 4,822 6,679 Commitments to fund loans, unfunded commitments to fund mortgage warehouse loans, unfunded commitments under lines of credit letters of credit and credit cards are agreements to extend credit to or for the benefit of a customer in the ordinary course of the Bank's business. Commitments to fund loans and unfunded commitments under lines of credit may be obligations of the Bank as long as there is no violation of any condition established in the contract. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Bank evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if the Bank deems it necessary upon extension of credit, is based upon management’s credit evaluation. Collateral held varies but may include personal or commercial real estate, accounts receivable, inventory and equipment. Mortgage warehouse loan commitments are agreements to fund the pipelines of mortgage banking businesses from closing of individual mortgage loans until their sale into the secondary market. Most of the individual mortgage loans are insured or guaranteed by the U.S. government through one of its programs such as FHA, VA, or are conventional loans eligible for sale to Fannie Mae and Freddie Mac. These commitments generally fluctuate monthly based on changes in interest rates, refinance activity, new home sales and laws and regulation. Outstanding letters of credit written are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Letters of credit may obligate the Bank to fund draws under those letters of credit whether or not a customer continues to meet the conditions of the extension of credit. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The current amount of the liabilities as of December 31, 2018 and 2017 for guarantees under standby letters of credit issued was not material.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Regulatory Matters	REGULATORY MATTERS 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 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. 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 December 31, 2018 and 2017 , 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 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 December 31, 2018 Common equity Tier 1 (to risk-weighted assets) Customers Bancorp, Inc. $ 745,795 8.964 % $ 374,388 4.500 % N/A N/A $ 530,384 6.375 % Customers Bank $ 1,066,121 12.822 % $ 374,160 4.500 % $ 540,453 6.500 % $ 530,059 6.375 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 963,266 11.578 % $ 499,185 6.000 % N/A N/A $ 655,180 7.875 % Customers Bank $ 1,066,121 12.822 % $ 498,879 6.000 % $ 665,173 8.000 % $ 654,779 7.875 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,081,962 13.005 % $ 665,580 8.000 % N/A N/A $ 821,575 9.875 % Customers Bank $ 1,215,522 14.619 % $ 665,173 8.000 % $ 831,466 10.000 % $ 821,072 9.875 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 963,266 9.665 % $ 398,668 4.000 % N/A N/A $ 398,668 4.000 % Customers Bank $ 1,066,121 10.699 % $ 398,570 4.000 % $ 498,212 5.000 % $ 398,570 4.000 % December 31, 2017 Common equity Tier 1 (to risk-weighted assets) Customers Bancorp, Inc. $ 689,494 8.805 % $ 352,368 4.500 % N/A N/A $ 450,248 5.750 % Customers Bank $ 1,023,564 13.081 % $ 352,122 4.500 % $ 508,621 6.500 % $ 449,934 5.750 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 906,963 11.583 % $ 469,824 6.000 % N/A N/A $ 567,704 7.250 % Customers Bank $ 1,023,564 13.081 % $ 469,496 6.000 % $ 625,994 8.000 % $ 567,307 7.250 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,021,601 13.047 % $ 626,432 8.000 % N/A N/A $ 724,313 9.250 % Customers Bank $ 1,170,666 14.961 % $ 625,994 8.000 % $ 782,493 10.000 % $ 723,806 9.250 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 906,963 8.937 % $ 405,949 4.000 % N/A N/A $ 405,949 4.000 % Customers Bank $ 1,023,564 10.092 % $ 405,701 4.000 % $ 507,126 5.000 % $ 405,701 4.000 % The Basel III risk-based capital rules adopted effective January 1, 2015, require that banks and holding companies maintain a "capital conservation buffer" of 250 basis points in excess of the "minimum capital ratio" or certain elective distributions would be limited. The minimum capital ratio is equal to the prompt corrective action adequately capitalized threshold ratio. The capital conservation buffer is being phased in over four years beginning on January 1, 2016 , with a maximum buffer of 0.625% of risk-weighted assets for 2016, 1.25% for 2017, 1.875% for 2018, and 2.5% for 2019 and thereafter. Effective January 1, 2018, the capital level required to avoid limitation on elective distributions applicable to the Bancorp and the Bank were as follows: (i) a common equity Tier 1 risk-based capital ratio of 6.375% ; (ii) a Tier 1 risk-based capital ratio of 7.875% and (iii) a Total risk-based capital ratio of 9.875% . Failure to maintain the required capital conservation buffer will result in limitations on elective distributions, including capital distributions and discretionary bonuses to executive officers.

Disclosures about Fair Value of

Disclosures about Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2018
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. FASB 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. However, many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under the FASB 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 (i.e., 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 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 December 31, 2018 and 2017 : Financial Instruments Recorded at Fair Value on a Recurring Basis Investment securities: The fair values of equity securities and available-for-sale debt securities are determined by obtaining quoted market prices on nationally recognized and foreign securities exchanges (Level 1), 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 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 - Consumer 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 mortgage loans and the finalization of the sale of the loans to an investor. Changes in fair value are not expected to be recognized since at inception of the transaction the underlying 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 23 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 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 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 the Bank 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. The Bank 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 the Bank's 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 Impaired loans: Impaired loans are those loans that are accounted for under ASC 310, Receivables, 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 or discounted cash flows based upon the expected proceeds. 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. The estimated fair values of Customers’ financial instruments at December 31, 2018 and 2017 were as follows: Carrying Amount Estimated Fair Value Fair Value Measurements at December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (amounts in thousands) Assets Cash and cash equivalents $ 62,135 $ 62,135 $ 62,135 $ — $ — Debt securities, available for sale 663,294 663,294 — 663,294 — Equity securities 1,718 1,718 1,718 — — Loans held for sale 1,507 1,507 — 1,507 — Total loans receivable, net of allowance for loan losses 8,503,522 8,481,128 — 1,405,420 7,075,708 FHLB, Federal Reserve Bank and other restricted stock 89,685 89,685 — 89,685 — Derivatives 14,693 14,693 — 14,624 69 Liabilities Deposits $ 7,142,236 $ 7,136,009 $ 5,408,055 $ 1,727,954 $ — Federal funds purchased 187,000 187,000 187,000 — — FHLB advances 1,248,070 1,248,046 998,070 249,976 — Other borrowings 123,871 121,718 — 121,718 — Subordinated debt 108,977 110,550 — 110,550 — Derivatives 16,286 16,286 — 16,286 — Carrying Amount Estimated Fair Value Fair Value Measurements at December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (amounts in thousands) Assets Cash and cash equivalents $ 146,323 $ 146,323 $ 146,323 $ — $ — Investment securities, available for sale 471,371 471,371 3,352 468,019 — Loans held for sale 146,077 146,251 — 1,886 144,365 Total loans receivable, net of allowance for loan losses 8,523,651 8,470,171 — 1,793,408 6,676,763 FHLB, Federal Reserve Bank, and other restricted stock 105,918 105,918 — 105,918 — Derivatives 9,752 9,752 — 9,692 60 Liabilities Deposits $ 6,800,142 $ 6,796,095 $ 4,894,449 $ 1,901,646 $ — Federal funds purchased 155,000 155,000 155,000 — — FHLB advances 1,611,860 1,611,603 881,860 729,743 — Other borrowings 186,497 193,557 65,072 128,485 — Subordinated debt 108,880 115,775 — 115,775 — Derivatives 10,074 10,074 — 10,074 — For financial assets and liabilities measured at fair value on a recurring and non-recurring basis, the fair value measurements by level within the fair value hierarchy used at December 31, 2018 and 2017 , were as follows: December 31, 2018 Fair Value Measurements at the End of the Reporting Period Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total (amounts in thousands) Measured at Fair Value on a Recurring Basis Assets Available-for-sale securities Agency-guaranteed residential mortgage-backed securities $ — $ 305,374 $ — $ 305,374 Corporate notes — 357,920 — 357,920 Equity securities 1,718 — — 1,718 Derivatives — 14,624 69 14,693 Loans held for sale – fair value option — 1,507 — 1,507 Loans receivable, mortgage warehouse – fair value option — 1,405,420 — 1,405,420 Total assets - recurring fair value measurements $ 1,718 $ 2,084,845 $ 69 $ 2,086,632 Liabilities Derivatives $ — $ 16,286 $ — $ 16,286 Measured at Fair Value on a Nonrecurring Basis Assets Impaired loans, net of specific reserves of $845 $ — $ — $ 10,876 $ 10,876 Other real estate owned — — 621 621 Total assets - nonrecurring fair value measurements $ — $ — $ 11,497 $ 11,497 December 31, 2017 Fair Value Measurements at the End of the Reporting Period Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (amounts in thousands) Measured at Fair Value on a Recurring Basis Assets Available-for-sale securities: Agency-guaranteed residential mortgage-backed securities $ — $ 183,458 $ — $ 183,458 Agency-guaranteed commercial mortgage-backed securities — 238,472 — 238,472 Corporate notes — 46,089 — 46,089 Equity securities 3,352 — — 3,352 Derivatives — 9,692 60 9,752 Loans held for sale – fair value option — 1,886 — 1,886 Loans receivable, mortgage warehouse – fair value option — 1,793,408 — 1,793,408 Total assets - recurring fair value measurements $ 3,352 $ 2,273,005 $ 60 $ 2,276,417 Liabilities Derivatives $ — $ 10,074 $ — $ 10,074 Measured at Fair Value on a Nonrecurring Basis Assets Impaired loans, net of specific reserves of $1,451 $ — $ — $ 13,902 $ 13,902 Other real estate owned — — 1,449 1,449 Total assets - nonrecurring fair value measurements $ — $ — $ 15,351 $ 15,351 The changes in Level 3 assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and 2017 , are summarized as follows in the tables below. Additional information about residential mortgage loan commitments can be found in NOTE 19 — DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES. For the Years Ended December 31, 2018 2017 Residential Mortgage Loan Commitments (amounts in thousands) Balance at December 31, $ 60 $ 45 Issuances 407 360 Settlements (398 ) (345 ) Balance at December 31, $ 69 $ 60 There were no transfers between levels during the years ended December 31, 2018 and 2017 . The following table summarizes financial assets and financial liabilities measured at fair value as of December 31, 2018 and 2017 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 December 31, 2018 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted (dollars in thousands) Impaired loans - real estate $ 10,260 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Impaired loans - Commercial & Industrial 616 Business asset valuation (3) Business asset valuation adjustments (4) 8% - 50% Other real estate owned 621 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Residential mortgage loan commitments 69 Adjusted market bid Pull-through rate 90% - 90% Quantitative Information about Level 3 Fair Value Measurements December 31, 2017 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted (dollars in thousands) Impaired loans $ 13,902 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Other real estate owned 1,449 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Residential mortgage loan commitments 60 Adjusted market bid Pull-through rate 90% - 90% (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. The Bank 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	12 Months Ended
	Dec. 31, 2018
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. 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 sometimes 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 AOCI and subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. To date, such derivatives were used to hedge the variable cash flows associated with the forecasted issuances of debt. 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 AOCI are reclassified immediately into earnings and any subsequent changes in the fair value of such derivatives are recognized directly in earnings. During the year ended December 31, 2018 , Customers recognized gains of $4.8 million in other non-interest income on discontinued cash flow hedge accounting for and subsequent termination of three interest rate swaps with notional amounts totaling $500 million . Amounts reported in AOCI related to derivatives will be reclassified to interest expense as interest payments are made on Customers’ variable-rate debt. Customers expects to reclassify $0.2 million from AOCI as a reduction to interest expense during the next 12 months. Customers is hedging its exposure to the variability in future cash flows for forecasted transactions over a maximum period of 30 months (excluding forecasted transactions related to the payment of variable interest on existing financial instruments). At December 31, 2018 , Customers had six outstanding interest rate derivatives with notional amounts totaling $ 750.0 million that were designated as cash flow hedges of interest-rate risk. At December 31, 2017 , Customers had nine outstanding interest rate derivatives with notional amounts totaling $550.0 million that were designated as cash flow hedges of interest-rate risk. The hedges expire between January 2019 and July 2021. Derivatives Not Designated as Hedging Instruments Customers executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies (typically the loan customers will swap a floating-rate loan for a fixed-rate loan). The customer interest rate swaps are simultaneously offset by interest rate swaps that Customers executes with a third party in order to minimize interest-rate risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting third-party market swaps are recognized directly in earnings. At December 31, 2018 , Customers had 98 interest rate swaps with an aggregate notional amount of $ 1.0 billion related to this program. At December 31, 2017 , Customers had 76 interest rate swaps with an aggregate notional amount of $ 800.5 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 December 31, 2018 and 2017 , Customers had an outstanding notional balance of residential mortgage loan commitments of $ 3.6 million and $ 2.7 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 December 31, 2018 and 2017 , Customers had outstanding notional balances of credit derivatives of $94.9 million and $80.5 million , respectively. Fair Value of Derivative Instruments on the Balance Sheet The following table presents the fair value of Customers’ derivative financial instruments as well as their presentation on the consolidated balance sheets at December 31, 2018 and 2017 . December 31, 2018 Derivative Assets Derivative Liabilities Balance Sheet Location Fair Value Balance Sheet Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges Interest rate swaps Other assets $ 256 Other liabilities $ 1,502 Total $ 256 $ 1,502 Derivatives not designated as hedging instruments Interest rate swaps Other assets $ 14,300 Other liabilities $ 14,730 Credit contracts Other assets 68 Other liabilities 54 Residential mortgage loan commitments Other assets 69 Other liabilities — Total $ 14,437 $ 14,784 December 31, 2017 Derivative Assets Derivative Liabilities Balance Sheet Location Fair Value Balance Sheet Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges Interest rate swaps Other assets $ 816 Other liabilities $ 1,140 Total $ 816 $ 1,140 Derivatives not designated as hedging instruments Interest rate swaps Other assets $ 8,776 Other liabilities $ 8,897 Credit contracts Other assets 100 Other liabilities 37 Residential mortgage loan commitments Other assets 60 Other liabilities — Total $ 8,936 $ 8,934 Effect of Derivative Instruments on Comprehensive Income The following table presents the effect of Customers' derivative financial instruments on comprehensive income for the years ended December 31, 2018 , 2017 and 2016 . For the Year Ended December 31, 2018 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps (1) Other non-interest income $ 3,409 Credit contracts Other non-interest income 127 Residential mortgage loan commitments Mortgage banking income 9 Total $ 3,545 (1) Includes income recognized from the termination of interest rate swaps. For the Year Ended December 31, 2017 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps Other non-interest income $ 604 Credit contracts Other non-interest income 171 Residential mortgage loan commitments Mortgage banking income 15 Total $ 790 For the Year Ended December 31, 2016 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps Other non-interest income $ 2,955 Credit contracts Other non-interest income 163 Residential mortgage loan commitments Mortgage banking income — Total $ 3,118 For the Year Ended December 31, 2018 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 (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 1,477 Interest expense $ 95 Other non-interest income (2) 2,822 $ 2,917 (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. (2) Includes income recognized from the termination of interest rate swaps. For the Year Ended December 31, 2017 Location of Gain Amount of Gain (Loss) Amount of Gain (Loss) (Loss) Reclassified Reclassified from Recognized in OCI on from Accumulated Accumulated OCI into Derivatives (1) OCI into Income Income (amounts in thousands) Derivative in cash flow hedging relationship: Interest rate swaps $ 406 Interest expense $ (2,634 ) (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 Year Ended December 31, 2016 Location of Gain Amount of Gain (Loss) Amount of Gain (Loss) (Loss) Reclassified Reclassified from Recognized in OCI on from Accumulated Accumulated OCI into Derivatives (1) OCI into Income Income (amounts in thousands) Derivative in cash flow hedging relationship: Interest rate swaps $ (629 ) Interest expense $ (1,946 ) (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. 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 December 31, 2018 , 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 $ 2.6 million . In addition, Customers has collateral posting thresholds with certain of these counterparties and at December 31, 2018 , had posted $ 0.7 million of cash as collateral. 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 with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps 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. Offsetting of Financial Assets and Derivative Assets at December 31, 2018 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 7,529 $ — $ 7,529 $ — $ 1,860 $ 5,669 Offsetting of Financial Assets and Derivative Assets at December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 5,930 $ — $ 5,930 $ — $ 5,070 $ 860 Offsetting of Financial Liabilities and Derivative Liabilities at December 31, 2018 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 9,077 $ — $ 9,077 $ — $ 702 $ 8,375 Offsetting of Financial Liabilities and Derivative Liabilities at December 31, 2017 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 5,058 $ — $ 5,058 $ — $ 4,872 $ 186

Condensed Financial Statements

Condensed Financial Statements of Parent Company	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Statements of Parent Company	CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY The following tables present the condensed financial statements for Customers Bancorp, Inc. (parent company only) as of December 31, 2018 and 2017 , and for the years ended December 31, 2018 , 2017 and 2016 . Balance Sheets December 31, 2018 2017 (amounts in thousands) Assets Cash in subsidiary bank $ 16,684 $ 67,231 Investments in and receivables due from subsidiaries 1,061,389 1,039,883 Other assets 3,417 3,160 Total assets $ 1,081,490 $ 1,110,274 Liabilities and Shareholders' equity Borrowings $ 123,871 $ 186,497 Other liabilities 803 2,813 Total liabilities 124,674 189,310 Shareholders' equity 956,816 920,964 Total Liabilities and Shareholders' Equity $ 1,081,490 $ 1,110,274 Income and Comprehensive Income Statements For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Operating income: Other, including dividends from Bank $ 45,422 $ 38,200 $ 25,400 Total operating income 45,422 38,200 25,400 Operating expense: Interest 8,178 7,984 5,854 Other 1,722 1,742 4,570 Total operating expense 9,900 9,726 10,424 Income before taxes and undistributed income of subsidiaries 35,522 28,474 14,976 Income tax benefit 2,335 3,620 3,961 Income before undistributed income of subsidiaries 37,857 32,094 18,937 Equity in undistributed income of subsidiaries 33,838 46,743 59,765 Net income 71,695 78,837 78,702 Preferred stock dividends 14,459 14,459 9,515 Net income available to common shareholders 57,236 64,378 69,187 Comprehensive income $ 50,730 $ 83,370 $ 81,794 Statements of Cash Flows For the Years Ended December 31, (amounts in thousands) 2018 2017 2016 Cash Flows from Operating Activities: Net income $ 71,695 $ 78,837 $ 78,702 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries, net of dividends received from Bank (33,838 ) (46,743 ) (59,765 ) Loss on sale of available for sale investment securities — — 1 (Increase) decrease in other assets (256 ) 7,624 (7,721 ) (Decrease) increase in other liabilities (251 ) (1,322 ) 54 Net Cash Provided By Operating Activities 37,350 38,396 11,271 Cash Flows from Investing Activities: Proceeds from sales of investment securities available for sale — — 4 Payments for investments in and advances to subsidiaries (29 ) (98,725 ) (230,872 ) Net Cash Used in Investing Activities (29 ) (98,725 ) (230,868 ) Cash Flows from Financing Activities: Proceeds from issuance of common stock 3,585 2,716 70,985 Proceeds from issuance of preferred stock — — 161,902 (Repayment of) proceeds from issuance of long-term debt (63,250 ) 98,564 — Exercise and redemption of warrants 112 1,059 1,532 Purchase of common stock - repurchase program (12,976 ) — — Payments of employee taxes withheld from share-based awards (880 ) (14,761 ) (5,897 ) Preferred stock dividends paid (14,459 ) (14,459 ) (9,051 ) Net Cash (Used in) Provided by Financing Activities (87,868 ) 73,119 219,471 Net (Decrease) Increase in Cash and Cash Equivalents (50,547 ) 12,790 (126 ) Cash and Cash Equivalents - Beginning 67,231 54,441 54,567 Cash and Cash Equivalents - Ending $ 16,684 $ 67,231 $ 54,441

Selected Quarterly Financial Da

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) The following table presents selected quarterly data for the years ended December 31, 2018 and 2017 . 2018 Quarter Ended December 31 September 30 June 30 March 31 (amounts in thousands, except per share data) Interest income $ 103,303 $ 110,045 $ 107,639 $ 96,964 Interest expense 41,779 46,044 40,317 31,933 Net interest income 61,524 64,001 67,322 65,031 Provision for loan losses 1,385 2,924 (784 ) 2,117 Non-interest income (1) 19,877 2,084 16,127 20,910 Non-interest expenses 57,045 57,104 53,750 52,280 Income before income taxes 22,971 6,057 30,483 31,544 Provision for income taxes 5,109 28 6,820 7,402 Net income 17,862 6,029 23,663 24,142 Preferred stock dividends 3,615 3,615 3,615 3,615 Net income available to common shareholders $ 14,247 $ 2,414 $ 20,048 $ 20,527 Earnings per common share: Basic earnings per common share $ 0.45 $ 0.08 $ 0.64 $ 0.65 Diluted earnings per common share $ 0.44 $ 0.07 $ 0.62 $ 0.64 (1) The quarter ended September 30, 2018 included an $18.7 million loss on sale of investment securities. 2017 Quarter Ended December 31 September 30 June 30 March 31 (amounts in thousands, except per share data) Interest income $ 97,619 $ 98,285 $ 93,852 $ 83,094 Interest expense 29,319 30,266 25,246 20,676 Net interest income 68,300 68,019 68,606 62,418 Provision for loan losses 831 2,352 535 3,050 Non-interest income 19,740 18,026 18,391 22,754 Non-interest expenses 54,788 61,040 50,413 49,366 Income before income taxes 32,421 22,653 36,049 32,756 Provision for income taxes 10,806 14,899 12,327 7,009 Net income 21,615 7,754 23,722 25,747 Preferred stock dividends 3,615 3,615 3,615 3,615 Net income available to common shareholders $ 18,000 $ 4,139 $ 20,107 $ 22,132 Earnings per common share: Basic earnings per common share $ 0.58 $ 0.13 $ 0.66 $ 0.73 Diluted earnings per common share $ 0.55 $ 0.13 $ 0.62 $ 0.67

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2018
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, 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 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 interchange and card revenue, deposit and wire transfer fees and university fees. The majority of revenue and 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 years ended December 31, 2018 , 2017 and 2016 . 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 24.56% , 37.67% and 38.00% for the years ended December 31, 2018, 2017 and 2016 , respectively. For the Year Ended December 31, 2018 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 400,948 $ 17,003 $ 417,951 Interest expense 159,674 400 160,074 Net interest income 241,274 16,603 257,877 Provision for loan losses 2,928 2,714 5,642 Non-interest income 17,499 41,499 58,998 Non-interest expense 146,946 73,233 220,179 Income (loss) before income taxes 108,899 (17,845 ) 91,054 Income tax expense (benefit) 23,742 (4,383 ) 19,359 Net income (loss) 85,157 (13,462 ) 71,695 Preferred stock dividends 14,459 — 14,459 Net income (loss) available to common shareholders $ 70,698 $ (13,462 ) $ 57,236 Goodwill and other intangibles $ 3,629 $ 12,870 $ 16,499 Total assets $ 9,688,146 $ 145,279 $ 9,833,425 Total deposits $ 6,766,378 $ 375,858 $ 7,142,236 Total non-deposit liabilities $ 1,719,225 $ 15,148 $ 1,734,373 For the Year Ended December 31, 2017 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 359,931 $ 12,919 $ 372,850 Interest expense 105,438 69 105,507 Net interest income 254,493 12,850 267,343 Provision for loan losses 5,638 1,130 6,768 Non-interest income 24,788 54,122 78,910 Non-interest expense 128,604 87,002 215,606 Income (loss) before income taxes 145,039 (21,160 ) 123,879 Income tax expense (benefit) 53,013 (7,971 ) 45,042 Net income (loss) 92,026 (13,189 ) 78,837 Preferred stock dividends 14,459 — 14,459 Net income (loss) available to common shareholders $ 77,567 $ (13,189 ) $ 64,378 Goodwill and other intangibles $ 3,630 $ 12,665 $ 16,295 Total assets $ 9,769,996 $ 69,559 $ 9,839,555 Total deposits $ 6,400,310 $ 399,832 $ 6,800,142 Total non-deposit liabilities $ 2,106,919 $ 11,530 $ 2,118,449 (1) Amounts reported include funds transfer pricing of $15.7 million and $12.9 million , respectively, for the years ended December 31, 2018 and 2017 , credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the net use of low/no-cost deposits. For the Year Ended December 31, 2016 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 315,643 $ 6,896 $ 322,539 Interest expense 73,004 38 73,042 Net interest income 242,639 6,858 249,497 Provision for loan losses 2,246 795 3,041 Non-interest income 23,165 33,205 56,370 Non-interest expense 130,394 47,837 178,231 Income (loss) before income taxes 133,164 (8,569 ) 124,595 Income tax expense (benefit) 49,149 (3,256 ) 45,893 Net income (loss) 84,015 (5,313 ) 78,702 Preferred stock dividends 9,515 — 9,515 Net income (loss) available to common shareholders $ 74,500 $ (5,313 ) $ 69,187 Goodwill and other intangibles $ 3,639 $ 13,982 $ 17,621 Total assets $ 9,303,465 $ 79,271 $ 9,382,736 Total deposits $ 6,846,980 $ 456,795 $ 7,303,775 Total non-deposit liabilities $ 1,195,087 $ 28,002 $ 1,223,089 (1) Amounts reported include funds transfer pricing of $6.9 million for the year ended December 31, 2016, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the net use of low/no-cost deposits.

Non-Interest Revenue

Non-Interest Revenue	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Non-Interest Revenue	NON-INTEREST REVENUES As provided in NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION, Customers' adoption of ASU 2014-09, Revenue from Contracts with Customers (ASC 606), on January 1, 2018, did not have a significant impact to Customers' consolidated financial statements and, as such, a cumulative effect adjustment to beginning retained earnings was not necessary. Customers determined that its debit and prepaid card interchange income, previously reported on a gross basis for periods prior to adoption, will need to be presented on a net basis under ASC 606. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts were not adjusted and continue to be reported in accordance with the previous accounting guidance under ASC 605. Debit and prepaid card interchange expense for the years ended December 31, 2018 , 2017 , and 2016 amounted to $5.5 million , $5.9 million , and $1.3 million , respectively. In addition, as part of the enhanced disclosure requirements under the new guidance, Customers is presenting disaggregated revenue by business segment, nature of the revenue stream, and the pattern or timing of revenue recognition. The accounting treatment for interest-related revenues is covered under ASC 310 and is out of the scope of ASC 606. The following tables present Customers' non-interest revenues affected by ASC 606 by business segment for the years ended December 31, 2018 , 2017 , and 2016 : For the Year Ended December 31, 2018 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 794 $ 29,901 $ 30,695 Deposit fees 1,277 6,547 7,824 University fees - card and disbursement fees — 1,039 1,039 Total revenue recognized at point in time 2,071 37,487 39,558 Revenue recognized over time: University fees - subscription revenue — 3,681 3,681 Total revenue recognized over time — 3,681 3,681 Total revenue from contracts with customers $ 2,071 $ 41,168 $ 43,239 For the Year Ended December 31, 2017 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 782 $ 40,727 $ 41,509 Deposit fees 1,190 8,849 10,039 University fees - card and disbursement fees — 1,141 1,141 Total revenue recognized at point in time 1,972 50,717 52,689 Revenue recognized over time: University fees - subscription revenue — 3,272 3,272 Total revenue recognized over time — 3,272 3,272 Total revenue from contracts with customers $ 1,972 $ 53,989 $ 55,961 For the Year Ended December 31, 2016 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 620 $ 24,061 $ 24,681 Deposit fees 1,140 6,927 8,067 University fees - card and disbursement fees — 581 581 Total revenue recognized at point in time 1,760 31,569 33,329 Revenue recognized over time: University fees - subscription revenue — 1,567 1,567 Total revenue recognized over time — 1,567 1,567 Total revenue from contracts with customers $ 1,760 $ 33,136 $ 34,896 The following is a discussion of revenues within the scope of ASC 606: Card revenue Card revenue primarily relates to debit and prepaid card fees earned from interchange and ATM fees. Interchange fees are earned whenever Customers' issued debit and prepaid cards are processed through card payment networks. Interchange fees are recognized concurrent with the processing of the debit or prepaid card transaction. Deposit fees Deposit fees relate to service charges on deposit accounts for transaction-based, account maintenance and overdraft services. Transaction-based fees, which include services such as stop-payment charges, wire transfer fees, cashier and money order fees are recognized at the time the transaction is executed. Account maintenance fees, which relate primarily to monthly maintenance and account analysis fees, are earned on a monthly basis representing the period over which Customers satisfies its performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposit accounts are withdrawn from the depositor's account balance. The revenues recognized at a point in time primarily consist of contracts with no specified terms, but which may be terminated at any time by the customer without penalty. Due to the transactional nature and indefinite term of these agreements, there were no related contract balances that were recorded for these revenue streams on Customers' consolidated balance sheets as of December 31, 2018 and 2017. University fees University fees represent revenues from higher education institutions and are generated from fees charged for the services provided. For higher education institution clients, Customers, through BankMobile, facilitates the distribution of financial aid and other refunds to students, while simultaneously enhancing the ability of the higher education institutions to comply with the federal regulations applicable to financial aid transactions. For these services, higher education institution clients are charged an annual subscription fee and/or per-transaction fee (e.g., new card, card replacement fees) for certain transactions. The annual subscription fee is recognized ratably over the period of service and the transaction fees are recognized when the transaction is completed. BankMobile also enters into long-term (generally three or five -year initial term) contracts with higher education institutions to provide these refund management disbursement services. Deferred revenue consists of amounts billed to or received from clients prior to the performance of services. The deferred revenues are earned over the service period on a straight-line basis. As of December 31, 2018 and 2017, Customers recorded deferred revenue of $2.2 million and $2.0 million , respectively, related to these university subscription contracts. At December 31, 2018 and 2017, Customers had accounts receivable of $1.4 million and $1.1 million , respectively, related to the university fee arrangements.

Significant Accounting Polici_2

Significant Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accounting and reporting policies of Customers Bancorp, Inc. and subsidiaries are in conformity with U.S. GAAP and predominant practices of the banking industry. The preparation of financial statements requires management to make estimates and assumptions that affect the reported balances of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for loan losses, credit deterioration and expected cash flows of purchased-credit-impaired loans, valuation of deferred tax assets, OTTI losses on securities, fair values of financial instruments, fair value of share-based compensation awards and annual goodwill and intangible asset impairment analysis.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of the parent company and its wholly owned subsidiaries, including Customers Bank, CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd., as well as Customers Bank's wholly owned subsidiaries, BankMobile Technologies, Inc., Customers Commercial Finance, LLC and Devon Service PA LLC. All significant intercompany balances and transactions have been eliminated in consolidation.
Cash and Cash Equivalents and Statements of Cash Flows	Cash and Cash Equivalents and Statements of Cash Flows Cash and cash equivalents include cash on hand, amounts due from banks and interest-bearing deposits with banks with a maturity date of three months or less and are recorded at cost. The carrying value of cash and cash equivalents is a reasonable estimate of its approximate fair value. Changes in the balances of cash and cash equivalents are reported on the consolidated statements of cash flows. Cash receipts from the repayment or sale of loans are classified within the statement of cash flows based on management's original intent upon origination of the loan, as prescribed by accounting guidance related to the statement of cash flows. Commercial mortgage warehouse loans are classified as held for investment and presented at "Loans receivable, mortgage warehouse, at fair value" on the consolidated balance sheets and the cash flow activities associated with these commercial mortgage warehouse lending activities are reported as investing activities on the consolidated statements of cash flows.
Restrictions on Cash and Amounts due from Banks	Restrictions on Cash and Amounts due from Banks Customers Bank is required to maintain average balances at a certain level of cash and amounts on deposit with the Federal Reserve Bank.
Business Combinations	Business Combinations Business combinations are accounted for by applying the acquisition method in accordance with ASC 805, Business Combinations . Under the acquisition method, identifiable assets acquired and liabilities assumed are measured at their fair values as of the date of acquisition and are recognized separately from goodwill. The results of operations of the acquired entity are included in the consolidated statement of income from the date of acquisition. Customers recognizes goodwill when the acquisition price exceeds the estimated fair value of the net assets acquired.
Investment Securities	Investment Securities Customers acquires securities, largely mortgage-backed securities and corporate notes, to effectively utilize cash and capital and to generate earnings. Security transactions are recorded as of the trade date. Debt securities are classified at the time of acquisition as available for sale, HTM or trading, and their classification determines the accounting as follows: Available for sale : Investment securities classified as available for sale are those debt securities that Customers intends to hold for an indefinite period of time but not necessarily to maturity. Investment securities available for sale are carried at fair value. Unrealized gains or losses are reported as increases or decreases in AOCI, net of the related deferred tax effect. Realized gains or losses, determined on the basis of the cost of the specific securities sold, are included in earnings and recorded on the trade date. Premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Held to maturity : Investment securities classified as HTM are those debt securities that Customers has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or changes in general economic conditions. These securities are carried at cost, adjusted for the amortization of premiums and accretion of discounts, computed by a method which approximates the interest method over the terms of the securities. There were no securities classified as HTM as of December 31, 2018 and 2017 . Equity securities: Equity securities are carried at their fair value, with changes in fair value reported in income beginning in 2018. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments. For years ended December 31, 2017 and prior, equity securities were classified as available for sale and carried at fair value, with unrealized gains or losses reported as increases or decreases in AOCI, net of the related deferred tax effect. For available-for-sale and held-to-maturity debt securities, management periodically assesses whether the securities are other than temporarily impaired. OTTI means that management believes a security’s decline in fair value below its amortized cost basis is due to factors that could include the issuer’s inability to pay interest or dividends, its potential for default and/or other factors. When a held-to-maturity or available-for-sale debt security is assessed for OTTI, management has to first consider (a) whether Customers intends to sell the security, and (b) whether it is more likely than not that Customers will be required to sell the security prior to recovery of its amortized cost basis. If one of these circumstances applies to a security, an OTTI loss is recognized in the consolidated statements of income equal to the full amount of the decline in fair value below the amortized cost basis. If neither of these circumstances applies to a security, but Customers does not expect to recover the entire amortized cost basis, an OTTI has occurred that must be separated into two categories for debt securities: (a) the amount related to a credit loss and (b) the amount related to other factors. In determining the amount of OTTI attributable to credit loss, management compares the present value of cash flows expected to be collected to the amortized cost basis of the security. The portion of the total OTTI attributed to a credit loss is recognized in earnings (as the difference between the fair value and the present value of the estimated cash flows expected to be collected), while the amount related to all other factors is recognized in AOCI. The total OTTI loss is presented in the statement of income, less the portion recognized in AOCI. When a debt security becomes other-than-temporarily impaired, its amortized cost basis is reduced to reflect the portion of the total impairment related to credit loss. On January 1, 2018, Customers adopted the new accounting standard for financial instruments, which requires equity securities to be measured at fair value, except those accounted for under the equity method of accounting, with changes in fair value recognized in earnings in the period in which they occur and will no longer be deferred in AOCI. The adoption of this guidance resulted in an $1.0 million increase to beginning retained earnings and a $1.0 million decrease to beginning AOCI.
Loan Accounting Framework	Loan Accounting Framewor k The accounting for a loan depends on management’s strategy for the loan and on whether the loan was credit impaired at the date of acquisition. The Bank accounts for loans based on the following categories: • Loans held for sale, • Loans at fair value, • Loans receivable and • Purchased loans. The discussion that follows describes the accounting for loans in these categories.
Loans Held for Sale and Loans at Fair Value	Loans Held for Sale and Loans at Fair Value Loans originated or acquired by Customers with the intent to sell them in the secondary market are carried either at the lower of cost or fair value, determined in the aggregate, or at fair value, depending upon an election made at the time the loan is originated. These loans are generally sold on a non-recourse basis with servicing released. Gains and losses on the sale of loans accounted for at the lower of cost or fair value are recognized in earnings based on the difference between the proceeds received and the carrying amount of the loans, inclusive of deferred origination fees and costs, if any. As a result of changes in events and circumstances or developments regarding management’s view of the foreseeable future, loans not originated or acquired with the intent to sell may subsequently be designated as held for sale. These loans are transferred to the held-for-sale portfolio at the lower of amortized cost or fair value. When the recorded investment of the loan exceeds its fair value at the date of transfer to the held-for-sale portfolio, the excess will be recognized as a charge against the allowance for loan losses to the extent the loan's reduction in fair value has already been provided for in the allowance for loan losses. Any subsequent lower of cost or fair value adjustments are recognized as a valuation allowance with charges recognized in non-interest income. Loans originated or acquired by Customers with the intent to sell them for which fair value accounting is elected are reported at fair value, with changes in fair value recognized in earnings in the period in which they occur. Upon sale, any difference between the proceeds received and the carrying amount of the loan is recognized in earnings. No fees or costs related to such loans are deferred, so they do not affect the gain or loss calculation at the time of sale. An allowance for loan losses is not maintained on loans designated as held for sale or reported at fair value. Loans Receivable - Mortgage Warehouse, at Fair Value Certain mortgage warehouse lending transactions subject to master repurchase agreements are designated as loans receivable, mortgage warehouse and reported at fair value based on an election made to account for the loans at fair value. Pursuant to these agreements, Customers funds the pipelines for these mortgage lenders by sending payments directly to the closing agents for funded loans and receives proceeds directly from third party investors when the loans are sold into the secondary market. Commercial warehouse mortgage loans are classified as held for investment and presented as "Loans receivable, mortgage warehouse, at fair value" on the consolidated balance sheets. An allowance for loan losses is not maintained on loans reported at fair value.
Loans Receivable	Loans Receivable Loans receivable that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balances, net of an allowance for loan losses and any deferred fees. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the yield (interest income) of the related loans using the level-yield method without anticipating prepayments. Customers is generally amortizing these amounts over the contractual life of the loans. The accrual of interest is generally discontinued when the contractual payment of principal or interest has become 90 days past due or when management has doubts about further collectibility of principal or interest, even though the loan is currently performing. A loan may remain on accrual status if it is in the process of collection and is well secured. When a loan is placed on non-accrual status, unpaid accrued interest previously credited to income is reversed. Interest received on non-accrual loans is generally applied against principal until all principal has been recovered. Thereafter, payments are recognized as interest income until all unpaid amounts have been received. Generally, loans are restored to accrual status when the obligation is brought current and has performed in accordance with the contractual terms for a minimum of six months , and the ultimate collectibility of the total contractual principal and interest is no longer in doubt.
Purchased Loans	Purchased Loans Customers believes that the varying circumstances under which it purchases loans and the diverse credit quality of loans purchased should drive the decision as to whether loans in a portfolio should be deemed to be PCI loans. Therefore, loan purchases are evaluated on a case-by-case basis to determine the appropriate accounting treatment. Loans acquired that do not have evidence of credit deterioration at the purchase date are accounted for in accordance with ASC 310-20, Nonrefundable Fees and Other Costs, and loans acquired with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are accounted for in accordance with ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Loans that are purchased that do not have evidence of credit deterioration Purchased performing loans are initially recorded at fair value and include credit and interest rate marks associated with acquisition accounting adjustments. Purchase premiums or discounts are subsequently amortized or accreted as an adjustment to yield over the estimated contractual lives of the loans. There is no allowance for loan losses established at the acquisition date for acquired performing loans. An allowance for loan losses is recorded for any credit deterioration in these loans subsequent to acquisition. Loans that are purchased that have evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected For these types of loan purchases, evidence of deteriorated credit quality may include past-due and non-accrual status, borrower credit scores and recent loan-to-value percentages. The fair value of loans with evidence of credit deterioration is recorded net of a nonaccretable difference and accretable yield. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is the nonaccretable difference that is not included in the carrying amount of acquired loans. Subsequent to acquisition, estimates of cash flows expected to be collected are updated each reporting period based on updated assumptions regarding default rates, loss severities and other factors that are reflective of current market conditions. Subsequent decreases in expected cash flows will generally result in a provision for loan losses. Subsequent increases in expected cash flows will result in a reversal of the provision for loan losses to the extent of prior charges or a reclassification of the difference from nonaccretable to accretable with a positive impact on accretion of interest income in future periods. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of those cash flows. PCI loans acquired in the same fiscal quarter may be aggregated into one or more pools, provided that the loans have similar risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. On a quarterly basis, Customers re-estimates the total cash flows (both principal and interest) expected to be collected over the remaining life of each pool. These estimates incorporate assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that reflect the then-current market conditions. If the timing and/or amounts of expected cash flows on PCI loans are determined not to be reasonably estimable, no interest is accreted, and the loans are reported as non-accrual loans; however, when the timing and amounts of expected cash flows for PCI loans are reasonably estimable, interest is accreted, and the loans are reported as performing loans.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is established as losses that are estimated to have occurred and are recognized through provisions for loan losses. Loans deemed to be uncollectible are charged against the allowance for loan losses, and subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is maintained at a level considered appropriate to absorb probable incurred loan losses inherent in the loan portfolio as of the reporting date. Customers segments its loan portfolio into groups of loans with similar risk characteristics for purposes of estimating the allowance for loan losses. Customers' loan groups include multi-family, commercial and industrial, owner and non-owner occupied commercial real estate, construction, residential real estate, manufactured housing, other consumer and PCI loans. SBA loans are further segmented. Customers also further segments its residential real estate portfolio into two classes based upon certain risk characteristics: first-mortgage loans and home equity loans and lines of credit. The remaining loan groups are also considered classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Additionally, within each loan group the acquired loans that are accounted for under ASC 310-10 are further segmented. The total allowance for loan losses consists of an allowance for impaired loans, a general allowance for losses and may also include residual non-specific reserve amounts. The allowance for loan losses is maintained at a level considered adequate to provide for losses that are estimated to have been incurred. Management performs a quarterly assessment of the adequacy of the allowance for loan losses, which is based on Customers' past loan loss experience, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, composition of the loan portfolio, current economic conditions, peer and industry data and other relevant factors. This evaluation is inherently subjective as it requires material estimates that may be susceptible to significant revision as more information becomes available. Customers' current methodology for determining the allowance for loan losses is based on historical loss rates, peer and industry data, current economic conditions, risk ratings, allowances on loans identified as impaired and other qualitative adjustments as considered appropriate. The impaired-loan component of the allowance for loan losses generally relates to loans for which it is probable that Customers will be unable to collect all amounts due according to the contractual terms of the loan agreements. Customers analyzes certain loans in its portfolio for impairment in accordance with ASC 310-10-35. Customers' impaired loans generally include loans that have been (i) placed on non-accrual, (ii) restructured in a TDR, regardless of their payment status and (iii) charged-off to their net realizable value. For such loans, an allowance is established when the (i) discounted cash flows, (ii) collateral value or (iii) the impaired loan estimated fair value is lower than the carrying value of the loan. The general component of the allowance for loan losses covers groups of loans by loan class, including commercial loans not considered impaired, as well as smaller balance homogeneous loans, such as residential real estate, home equity loans, home equity lines of credit and other consumer loans. These pools of loans are evaluated for loss exposure based upon industry, peer or Customers' historical loss rates for each of these groups of loans. After determining the appropriate historical loss rate for each group of loans, management considers current qualitative or environmental factors that are likely to cause estimated credit losses as of the evaluation date to differ from the historical loss experience. The overall effect of these factors is recorded as an adjustment that, as appropriate, increases or decreases the historical loss rate applied to the loan group. The qualitative factors that management generally considers include the following: • National, regional and local economic and business conditions, including review of changes in the unemployment rate; • 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; • Changes in the values of collateral for collateral dependent loans; • Changes in the quality of the loan review system; • Experience, ability and depth of lending management and staff; and • Other external factors, such as changes in the legal, regulatory or competitive environment. A residual reserve may be maintained to cover uncertainties that could affect management’s estimate of probable losses. The residual reserve amount reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating credit losses in the loan portfolio. The discussion that follows describes Customers' underwriting policies for its primary lending activities and its credit monitoring and charge-off practices. Commercial and industrial loans are underwritten after evaluating historical and projected profitability and cash flow to determine the borrower’s ability to repay its obligation as agreed. Commercial and industrial loans are made primarily based on the identified cash flow of the borrower and secondarily on the underlying collateral supporting the loan facility. Accordingly, the repayment of a commercial and industrial loan depends primarily on the creditworthiness of the borrower (and any guarantors), while liquidation of collateral is a secondary and often insufficient source of repayment. Construction loans are underwritten based upon a financial analysis of the developers and property owners and construction cost estimates, in addition to independent appraisal valuations. These loans rely on the value associated with the project upon completion. These cost and valuation amounts used are estimates and may be inaccurate. Construction loans generally involve the disbursement of substantial funds over a short period of time with repayment substantially dependent upon the success of the completed project. Sources of repayment of these loans would be permanent financing upon completion or sales of the developed property. These loans are closely monitored by on-site inspections and are considered to be of a higher risk than other real estate loans due to their ultimate repayment being sensitive to general economic conditions, availability of long-term financing, interest-rate sensitivity and governmental regulation of real property. Commercial real estate and multi-family loans are subject to the underwriting standards and processes similar to commercial and industrial loans, in addition to those underwriting standards for real estate loans. These loans are viewed primarily as cash flow dependent and secondarily as loans secured by real estate. Repayment of these loans is generally dependent upon the successful operation of the property securing the loan, or the principal business conducted on the property securing the loan, to generate sufficient cash flows to service the debt. In addition, the underwriting considers the amount of the principal advanced relative to the property value. Commercial real estate and multi-family loans may be adversely affected by conditions in the real estate markets or the economy in general. Management monitors and evaluates commercial real estate and multi-family loans based on cash flow estimates, collateral valuation and risk-rating criteria. Customers also utilizes third-party experts to provide environmental and market valuations. Substantial effort is required to underwrite, monitor and evaluate commercial real estate and multi-family loans. Residential real estate loans are secured by one-to-four dwelling units. This group is further divided into first mortgage and home equity loans. First mortgages are originated at a loan to value ratio of 80% or less. Home equity loans have additional risks as a result of typically being in a second position or lower in the event collateral is liquidated. Manufactured housing loans are loans that are secured by the manufactured housing unit where the borrower may or may not own the underlying real estate and therefore have a higher risk than a residential real estate loan. Other consumer loans consist of loans to individuals originated through Customers' retail network or through purchases and are typically secured by personal property or are unsecured. Consumer loans have a greater credit risk than residential loans because of the difference in the underlying collateral, if any. The application of various federal and state bankruptcy and insolvency laws may limit the amount that can be recovered on such loans. Delinquency status and other borrower characteristics are used to monitor loans and identify credit risks, and the general reserves are established based on the expected net charge-offs, adjusted for qualitative factors. Charge-offs on commercial and industrial, construction, multi-family and commercial real estate loans are recorded when management estimates that there are insufficient cash flows to repay the contractual loan obligation based upon financial information available and valuation of the underlying collateral. Shortfalls in the underlying collateral value for loans determined to be collateral dependent are charged-off immediately. Customers also takes into account the strength of any guarantees and the ability of the borrower to provide value related to those guarantees in determining the ultimate charge-off or allowance associated with an impaired loan. Accordingly, Customers may charge-off a loan to a value below the net appraised value if it believes that an expeditious liquidation is desirable under the circumstance, and it has legitimate offers or other indications of interest to support a value that is less than the net appraised value. Alternatively, Customers may carry a loan at a value that is in excess of the appraised value in certain circumstances, such as when Customers has a guarantee from a borrower that Customers believes has realizable value. In evaluating the strength of any guarantee, Customers evaluates the financial wherewithal of the guarantor, the guarantor’s reputation and the guarantor’s willingness and desire to work with Customers. Customers then conducts a review of the strength of a guarantee on a frequency established as the circumstances and conditions of the borrower warrant. Customers records charge-offs for residential real estate, consumer and manufactured housing loans after 120 days of delinquency or sooner when cash flows are determined to be insufficient for repayment. Customers may also charge-off these loans below the net appraised valuation if Customers holds a junior-mortgage position in a piece of collateral whereby the risk to acquiring control of the property through the purchase of the senior-mortgage position is deemed to potentially increase the risk of loss upon liquidation due to the amount of time to ultimately market the property and the volatile market conditions. In such cases, Customers may abandon its junior mortgage and charge-off the loan balance in full. Estimates of cash flows expected to be collected for PCI loans are updated each reporting period. If Customers estimates decreases in expected cash flows to be collected after acquisition, Customers charges the provision for loan losses and establishes an allowance for loan losses. Credit Quality Factors Commercial and industrial, multi-family, commercial real estate and construction loans are each assigned a numerical rating of risk based on an internal risk-rating system. The risk rating is assigned at loan origination and indicates management's estimate of credit quality. Risk ratings are reviewed on a periodic or “as needed” basis. Residential real estate, manufactured housing and other consumer loans are evaluated primarily based on payment activity of the loan. Risk ratings are not established for residential real estate, home equity loans, manufactured housing loans 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 on aggregate payment history (through the monitoring of delinquency levels and trends). For additional information about credit quality factor ratings refer to NOTE 7 – LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES. Impaired Loans A loan is generally considered impaired when, based on current information and events, it is probable that Customers will be unable to collect all amounts due according to the contractual terms of the loan agreement. Customers' impaired loans generally include loans that have been (i) placed on non-accrual, (ii) restructured in a TDR, regardless of their payment status and (iii) charged-off to their net realizable value. Factors considered by management in determining impairment include payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is generally measured on a loan-by-loan basis for commercial and construction loans by the present value of expected future cash flows discounted at the loan’s original effective interest rate, the loan’s obtainable market price or the fair value of the collateral if the loan is collateral dependent. The fair value of the collateral is measured based on the value of the collateral securing the loans, less estimated costs to liquidate the collateral. Collateral may be in the form of real estate or business assets including equipment, inventory and accounts receivable. The vast majority of Customers' collateral is real estate. The value of real estate collateral is determined utilizing an income or market valuation approach based on an appraisal conducted by an independent, third-party licensed appraiser using observable market data. The value of business equipment is based upon an outside appraisal if deemed significant or the net book value on the applicable business’ financial statements if not considered significant, using observable market data. Similarly, values for inventory and accounts receivable collateral are based on financial statement balances or aging reports.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the identifiable net assets of businesses acquired through business combinations accounted for under the acquisition method. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as customer and university relationships and non-compete agreements, are amortized over their estimated useful lives and are subject to impairment testing. Goodwill and other intangible assets are reviewed for impairment annually as of October 31 and between annual tests when events and circumstances indicate that impairment may have occurred. If there is a goodwill impairment charge, it will be the amount by which the reporting unit's carrying amount exceeds its fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The same one-step impairment test is applied to goodwill at all reporting units. Customers applies a qualitative assessment for its reporting units to determine if the one-step quantitative impairment test is necessary. Intangible assets subject to amortization are reviewed for impairment under ASC 360 which requires that a long-lived asset or asset group be tested for recoverability whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. As part of its qualitative assessment, Customers reviewed regional and national trends in current and expected economic conditions, examining indicators such as GDP growth, interest rates and unemployment rates. Customers also considered its own historical performance, expectations of future performance and other trends specific to the banking industry. Based on its qualitative assessment, Customers determined that there was no evidence of impairment on the balance of goodwill and other intangible assets.
FHLB, Federal Reserve Bank, and other restricted stock	FHLB, Federal Reserve Bank and other restricted stock FHLB, Federal Reserve Bank and other restricted stock represents required investment in the capital stock of the FHLB, the Federal Reserve Bank and Atlantic Community Bankers Bank and is carried at cost.
Other Real Estate Owned	Other Real Estate Owned Real estate properties acquired through, or in lieu of, loan foreclosure are initially recorded at fair value less estimated costs to sell at the date of foreclosure, establishing a new cost basis. After foreclosure, valuations are periodically performed by third-party appraisers, and the real estate is carried at the lower of its carrying amount or fair value less estimated costs to sell. Any declines in the fair value of the real estate properties below the initial cost basis are recorded through a valuation allowance. Increases in the fair value of the real estate properties net of estimated selling costs will reverse the valuation allowance but only up to the costs basis which was established at the initial measurement date. Revenue and expenses from operations and changes in the valuation allowance are included in earnings.
Bank-Owned Life Insurance	Bank-Owned Life Insurance Bank-owned life insurance policies insure the lives of officers of Customers and name Customers as beneficiary. Non-interest income is generated tax free (subject to certain limitations) from the increase in value of the policies’ underlying investments made by the insurance company. Cash proceeds received from the settlement of the bank-owned life insurance policies are tax-free and can be used to partially offset costs associated with employee compensation and benefit programs.
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment are recorded at cost less accumulated depreciation and amortization. Depreciation and amortization is computed on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the shorter of the term of the lease or estimated useful life, unless extension of the lease term is reasonably assured.
Operating Leases	Operating Leases Leased assets under operating leases are carried at amortized cost net of accumulated depreciation and any impairment charges. The depreciation expense of the leased assets is recognized on a straight-line basis over the contractual term of the leases up to their 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 other non-interest income on a straight-line basis over the lease term. Customers periodically reviews its leased assets for impairment. An impairment loss is recognized if the carrying amount of the leased asset exceeds its fair value and is not recoverable. The carrying amount of 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. During 2018, Customers leased various types of equipment to customers within its commercial and industrial loan portfolio. The net carrying value of the leased assets was $54.5 million and $21.7 million , which included accumulated depreciation of $4.8 million and $0.5 million , as of December 31, 2018 and 2017, respectively, and is presented in other assets in Customers’ consolidated balance sheets. As of December 31, 2018, the leases have a weighted-average term of 4.6 years.
Treasury Stock	Treasury Stock Common stock purchased for treasury is recorded at cost.
Income Taxes	Income Taxes Customers accounts for income taxes under the liability method of accounting for income taxes. The income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. Customers determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur. A tax position is recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent ; the term upon examination includes resolution of the related appeals or litigation process. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances and information available at the reporting date and is subject to management’s judgment. In assessing the realizability of federal or state deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and prudent, feasible and permissible as well as available tax planning strategies in making this assessment. Based on the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible as well as available tax planning strategies, management believes it is more likely than not that Customers will realize the benefits of these deferred tax assets. On December 22, 2017, the Tax Act was enacted into law. The Tax Act contained several key tax provisions including the reduction in the corporate federal tax rate from 35% to 21% effective January 1, 2018. As a result, Customers was required to re-measure, through income tax expense, its deferred tax assets and liabilities using the enacted rate at which it expected them to be recovered or settled. In December 2017, the SEC issued SAB 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act , which allowed companies to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. See NOTE 14 - INCOME TAXES for additional information.
Share-Based Compensation	Share-Based Compensation Customers has four active share-based compensation plans. Share-based-compensation accounting guidance requires that the compensation cost relating to share-based-payment transactions be recognized in earnings. The cost is measured based on the grant-date fair value of the equity instruments issued. The Black-Scholes model is used to estimate the fair value of stock options, while the closing market price of Customers’ common stock on the date of grant is generally used for restricted stock awards. Compensation cost for all share-based awards is calculated and recognized over the team member's service period, generally defined as the vesting period. For performance-based awards, compensation cost is recognized over the vesting period as long as it remains probable that the performance conditions will be met. If the service or performance conditions are not met, Customers reverses previously recorded compensation expense upon forfeiture. Customers' accounting policy election is to recognize forfeitures as they occur. In 2014, the shareholders of Customers Bancorp approved an ESPP. Because the purchase price under the plan is 85% (a 15% discount to the market price) of the fair market value of a share of common stock on the first day of each quarterly subscription period, the plan is considered to be a compensatory plan under current accounting guidance. Therefore, the entire amount of the discount is recognizable compensation expense. See NOTE 13 - SHARE-BASED COMPENSATION for additional information.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets, including loan participations sold, are accounted for as sales when control over the assets has been surrendered (settlement date). Control over transferred assets is generally considered to have been surrendered when (i) the assets have been isolated from Customers, (ii) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (iii) Customers does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. If the sale criteria are met, the transferred financial assets are removed from Customers' balance sheet, and a gain or loss on sale is recognized. If the sale criteria are not met, the transfer is recorded as a secured borrowing with the assets remaining on Customers' balance sheet, and the proceeds received from the transaction recognized as a liability.
Segment Information	Segment Information In connection with the acquisition of the Disbursement business from Higher One and the combination of that business with the BankMobile technology platform late in second quarter 2016, Customers' chief operating decision makers began allocating resources and assessing performance for two distinct business segments, "Customers Bank Business Banking" and "BankMobile." 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. 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 existing and potential white label partners. BankMobile, as a division of Customers Bank, is a full service bank that is accessible to customers anywhere and anytime through the customer's smartphone or other web-enabled device. Prior to third quarter 2016, Customers operated in one business segment, “Community Banking.” Additional information regarding reportable segments can be found in NOTE 22 - BUSINESS SEGMENTS.
Derivative Instruments and Hedging	Derivative Instruments and Hedging ASC 815, Derivatives and Hedging , provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (i) how and why an entity uses derivative instruments, (ii) how the entity accounts for derivative instruments and the related hedged items and (c) how derivative instruments and the related hedged items affect an entity’s financial position, financial performance and cash flows. Further, qualitative disclosures are required that explain the objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, Customers records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether Customers has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as hedges of the exposure to changes in the fair value of an asset, liability or firm commitment attributable to a particular risk, such as interest-rate risk, are considered fair value hedges. Derivatives designated and qualifying as hedges of the exposure to variability in expected future cash flows or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. Customers may enter into derivative contracts that are intended to economically hedge certain of its risks; even though hedge accounting does not apply, or Customers elects not to apply hedge accounting. Prior to first quarter 2014, none of Customers' financial derivatives were designated in qualifying hedge relationships in accordance with the applicable accounting guidance. As such, all changes in fair value of the financial derivatives were recognized directly in earnings. Beginning in March 2014, Customers entered into pay-fixed interest-rate swaps to hedge the variable cash flows associated with the forecasted issuance of debt. Customers documented and designated these interest-rate swaps as cash flow hedges. The effective portion of changes in the fair value of financial derivatives designated and qualifying as cash flow hedges is recorded in AOCI and is subsequently reclassified into earnings in the period in which the hedged forecasted transaction affects earnings. The ineffective portion of the change in fair value of the financial derivatives is recognized directly to interest expense. Amounts reported in AOCI related to financial derivatives will be reclassified to interest expense as interest payments are made on Customers' variable-rate debt. As of December 31, 2018 , Customers had six financial derivatives designated in qualifying cash flow hedge relationships with a notional aggregate balance of $750.0 million . As of December 31, 2017, Customers had nine financial derivatives designated in qualifying cash flow hedge relationships with a notional aggregate balance of $550.0 million . 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 were not designated in hedge relationships for accounting purposes and are being recorded at their fair value, with fair value changes recorded directly in earnings. At December 31, 2018 and 2017, Customers had an outstanding notional balance of credit derivatives of $94.9 million and $80.5 million , respectively. In accordance with the FASB’s fair value measurement guidance, Customers made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. See NOTE 19 - DERIVATIVE INSTRUMENTS for additional information. 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. 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.
Comprehensive Income	Comprehensive Income (Loss) Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes changes in unrealized gains and losses on debt securities available for sale arising during the period and reclassification adjustments for realized gains and losses on debt securities available for sale included in net income. Other comprehensive income (loss) also includes the effective portion of changes in fair value of financial derivatives designated and qualifying as cash flow hedges. Cash flow hedge amounts classified as comprehensive income are subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings.
Earnings per Share	Earnings per Share Basic EPS represents net income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted EPS includes all potentially dilutive common shares outstanding during the period. Potential common shares that may be issued related to outstanding stock options, restricted stock units and warrants are determined using the treasury stock method.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal, regulatory and governmental actions and proceedings arise in the ordinary course of business. In accordance with applicable accounting guidance, Customers establishes an accrued liability when those matters present loss contingencies that are both probable and estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. As a matter develops, Customers, in conjunction with any outside counsel handling the matter, evaluates on an ongoing basis whether such matter presents a loss contingency that is probable and estimable. Once the loss contingency is deemed to be both probable and estimable, Customers will establish an accrued liability and record a corresponding amount of litigation-related expense. Customers continues to monitor the matter for further developments that could affect the amount of the accrued liability that has been previously established. 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
Collaborative Arrangement	Collaborative Arrangements In the normal course of business, Customers may enter into collaborative arrangements primarily to develop and commercialize banking products to their partners' customers. Collaborative arrangements are contractual agreements with third parties that involve a joint operating activity where both Customers and the collaborating partner are active participants in the activity and are exposed to the significant risks and rewards of the activity. Collaborative activities typically include research and development, technology, product development, marketing, and day-to-day operations of the banking product. These arrangements often require the sharing of revenues and expense. Net interest income, non-interest income, and non-interest expenses incurred pursuant to these arrangements are reported net of any payments due to or amounts due from Customers' collaboration partners. Reimbursement of non-interest expenses are allocated to other non-interest expense and are recognized at the time the collaborative party becomes obligated to pay. Each collaboration is unique in nature. For the years ended December 31, 2018 and 2017, Customers recognized $8.4 million and $2.4 million , respectively, in expense reimbursements from collaborative arrangements. There were no such reimbursements during the year ended December 31, 2016. There was no revenue sharing with partners during the years ended December 31, 2018, 2017, and 2016.
Recently Issued Accounting Standards and Updates	Recently Issued Accounting Standards Accounting Standards Adopted in 2018 Since January 1, 2018, Customers has adopted the following FASB Accounting Standard Updates (“ASUs”), none of which had a material impact to Customers’ consolidated financial statements: Standard Summary of guidance Effects on Financial Statements ASU 2018-13, Fair Value (Topic 820): Changes to the Disclosure Requirements for Fair Value Measurement Issued August 2018 Ÿ Eliminates disclosure requirements for the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. Ÿ Clarifies that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. Ÿ Expands disclosures to include unrealized gains and losses for the period included in OCI for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. Ÿ Certain amendments are applied prospectively and retrospectively. Ÿ Effective for fiscal year beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. Ÿ Customers early adopted on September 30, 2018. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2018-03, Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) Issued February 2018 Ÿ Clarifies certain aspects of the guidance issued in ASU 2016-01 including: the ability to irrevocably elect to change the measurement approach for equity securities measured using the practical expedient (at cost plus or minus observable transactions less impairment) to a fair value method in accordance with ASC 820, Fair Value Measurement. Ÿ Provides clarification that if an observable transaction occurs for such securities, the adjustment is as of the observable transaction date. Ÿ Effective July 1, 2018 on a prospective basis with early adoption permitted. Ÿ Customers adopted on July 1, 2018 on a prospective basis. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements as Customers currently does not have any significant equity securities without readily determinable fair values. ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income/(Loss) Issued February 2018 Ÿ Allows for reclassification from AOCI to retained earnings for stranded tax effects resulting from the 2017 Tax Cut and Jobs Act. Ÿ Requires an entity to disclose whether it has elected to reclassify stranded tax effects from AOCI to retained earnings and its policy for releasing income tax effects from AOCI. Ÿ Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. Ÿ Customers early adopted on January 1, 2018. Ÿ The adoption resulted in the reclassification of $0.3 million in stranded tax effects in Customers' AOCI related to net unrealized losses on its available-for-sale debt securities and cash flow hedges. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. Accounting Standards Adopted in 2018 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities Issued August 2017 Ÿ Aligns the entity's risk management activities and financial reporting for hedging relationships. Ÿ Amends the existing hedge accounting model and expands an entity's ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest-rate risk. Ÿ Eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line item as the hedge item. Ÿ Changes certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. Ÿ Effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. Ÿ In October 2018, the FASB issued ASU 2018-16 “Derivatives and Hedging (Topic 815): Inclusion of the SOFR OIS Rate as a Benchmark Interest Rate for Hedge Accounting Purposes," which permits the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes. Ÿ Customers early adopted on January 1, 2018. Ÿ With the early adoption, Customers is able to pursue additional hedging strategies including the ability to apply fair value hedge accounting to a specified pool of assets by excluding the portion of the hedged items related to prepayments, defaults and other events. Ÿ These additional hedging strategies will allow Customers to better align the accounting and financial reporting of its hedging activities with the economic objectives thereby reducing the earnings volatility resulting from these hedging activities. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting Issued May 2017 Ÿ Clarifies when to account for a change to the terms or conditions of a share-based-payment award as a modification in ASC 718. Ÿ Provides that modification accounting is only required if the fair value, vesting conditions, or the classification of the award as equity or a liability changes as a result of the change in terms or conditions. Ÿ Effective January 1, 2018 on a prospective basis for awards modified on or after the adoption date. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Issued February 2017 Ÿ Clarifies the scope and application of the accounting guidance on the sale of nonfinancial assets to non-customers, including partial sales. Ÿ Clarifies that if substantially all of the fair value of the assets that are promised to the counterparty in a contract is concentrated in nonfinancial assets, then all of the financial assets promised to the counterparty are in substance nonfinancial assets within the scope of Subtopic 610-20. Ÿ Effective January 1, 2018 on a prospective basis. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2017-01, Clarifying the Definition of a Business Issued January 2017 Ÿ Narrows the definition of a business and clarifies that to be considered a business, the fair value of gross assets acquired (or disposed of) should not be concentrated in a single identifiable asset or a group of similar identifiable assets. Ÿ Also clarifies that in order to be considered a business, an acquisition would have to include an input and a substantive process that together will significantly contribute to the ability to create an output. Ÿ Effective January 1, 2018 on a prospective basis. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2016-18, Statement of Cash Flows: Restricted Cash Issued November 2016 Ÿ Requires inclusion of restricted cash in cash and cash equivalents when reconciling the beginning-of-period total amounts shown on the statement of cash flows. Ÿ Effective January 1, 2018 and requires retrospective application to all periods presented. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption did not result in any significant impact on Customers' financial condition, results of operations and consolidated financial statements, including its consolidated statement of cash flows, and therefore did not result in a retrospective application. Accounting Standards Adopted in 2018 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory Issued October 2016 Ÿ Requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Ÿ Eliminates the current exception for all intra-entity transfers of an asset other than inventory that requires deferral of the tax effects until the asset is sold to a third party or otherwise recovered through use. Ÿ Effective January 1, 2018 on a modified retrospective basis. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption of the ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2016-15, Statement of Cash Flow: Classification of Certain Cash Receipts and Cash Payments Issued August 2016 Ÿ Aims to reduce the existing diversity in practice with regards to the classification of the following specific items in the statement of cash flows: 1. Cash payments for debt prepayment or debt extinguishment costs should be classified as a financing activity. 2. Cash paid by an acquirer soon after a business combination for the settlement of a contingent consideration liability recognized at the acquisition date will be classified in investing activities. 3. Cash proceeds received from the settlement of insurance claims will be classified on the basis of the related insurance coverage (i.e., the nature of the loss). 4. Cash proceeds received from the settlement of bank-owned life insurance policies will be classified as cash inflows from investing activities. 5. A transferor's beneficial interest obtained in a securitization of financial assets will be disclosed as a non-cash activity, and cash received from beneficial interests will be classified in investing activities. Ÿ Effective January 1, 2018 and requires retrospective application to all periods presented. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption did not result in any significant impact on Customers' financial condition, results of operations and consolidated financial statements, including its consolidated statement of cash flows, and therefore it did not result in a retrospective application. ASU 2016-04, Liabilities - Extinguishment of Liabilities: Recognition of Breakage for Certain Prepaid Stored-Value Products Issued March 2016 Ÿ Requires issuers of prepaid stored-value products (such as gift cards, telecommunication cards, and traveler's checks), to derecognize the financial liability related to those products for breakage. Breakage is the value of prepaid stored-value products that is not redeemed by consumers for goods, services or cash. Ÿ The amendments in this ASU provide a narrow scope exception to the guidance in Subtopic 405-20 to require that breakage be accounted for consistent with the breakage guidance in Topic 606. Ÿ Effective January 1, 2018 on a modified retrospective basis. Ÿ Customers adopted on January 1, 2018. Ÿ The adoption of this ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. Accounting Standards Adopted in 2018 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities Issued January 2016 Ÿ Requires equity investments with certain exceptions to be measured at fair value with changes in fair value recognized in net income. Ÿ Simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. Ÿ Eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. Ÿ Requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. Ÿ Requires an entity to present separately in OCI the portion of the change in fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Ÿ Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. Ÿ Clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities. Ÿ Effective January 1, 2018 on a modified retrospective basis. Ÿ Customers adopted on January 1, 2018 using a modified retrospective approach. Ÿ The adoption of this ASU resulted in a cumulative-effect adjustment that resulted in a $1.0 million reduction in AOCI and a corresponding increase in retained earnings for the same amount. Ÿ The $1.0 million represented the net unrealized gain on Customers' investment in Religare equity securities at December 31, 2017, as disclosed in NOTE 5 - INVESTMENT SECURITIES. Ÿ Customers also refined its calculation to determine the fair value of its held-for- investment loan portfolio for disclosure purposes using an exit price notion as part of adopting this ASU. The refined calculation did not have a significant impact on Customers' fair value disclosures. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) Issued May 2014 Ÿ Supersedes the revenue recognition requirements in ASC 605. Ÿ Requires an entity to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Ÿ The amendment includes a five-step process to assist an entity in achieving the main principle(s) of revenue recognition under ASC 605. Ÿ Reframed the structure of the indicators of when an entity is acting as an agent and focused on evidence that an entity is acting as the principal or agent in a revenue transaction. Ÿ Requires additional qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Ÿ Effective January 1 , 2018 and can either be applied retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption (modified retrospective approach). Ÿ Customers adopted on January 1, 2018 on a modified retrospective basis. Ÿ Because the ASU does not apply to revenue associated with leases and financial instruments (including loans and securities), Customers concluded that the new guidance did not have a material impact on the elements of its consolidated statements of operations most closely associated with leases and financial instruments (such as interest income, interest expense and securities gains or losses). Ÿ Customers has identified its deposit-related fees, service charges, debit and prepaid card interchange income and university fees to be within the scope of the standard. Ÿ Customers has also completed its review of the related contracts and its evaluation of certain costs related to these revenue streams and determined that its debit and prepaid card interchange income, previously reported on a gross basis for periods prior to adoption, will need to be presented on a net basis under this ASU, as Customers is the agent. Ÿ The adoption of this ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. Additional discussion related to the adoption and the required quantitative and qualitative disclosures are included in NOTE 23 - NON-INTEREST REVENUES. Accounting Standards Adopted on January 1, 2019 Standard Summary of guidance Effects on Financial Statements ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Payment Accounting Issued June 2018 Ÿ Expands the scope of Topic 718, Compensation - Stock Compensation, which currently only includes share-based payments issued to employees, to also include share-based payments issued to non-employees for goods and services. Ÿ Applies to all share-based payment transactions in which a grantor acquires goods or services from non-employees to be used or consumed in a grantor's own operations by issuing share-based payment awards. Ÿ With the amended guidance from ASU 2018-07, non-employees share-based payments are measured with an estimate of the fair value of the equity the business is obligated to issue at the grant date (the date that the business and the stock award recipient agree to the terms of the award). Ÿ Compensation would be recognized in the same period and in the same manner as if the entity had paid cash for goods or services instead of stock. Ÿ Effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. Ÿ Customers adopted this ASU on January 1, 2019. The adoption of this ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2017-11, Accounting for Certain Financial Instruments with Down Round Features Issued July 2017 Ÿ Changes the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. Ÿ When determining whether certain financial instruments should be classified as liabilities or equity instruments, a down round feature no longer precludes equity classification when assessing whether the instrument is indexed to an entity's own stock. As a result, a freestanding equity-linked financial instrument (or embedded conversion option) would no longer be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. Ÿ For freestanding equity-classified financial instruments, the amendments require entities to recognize the effect of the down round feature when it is triggered. That effect is treated as a dividend and as a reduction of net income available to common shareholders in basic EPS. Ÿ Effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. Ÿ Customers adopted this ASU on January 1, 2019. The adoption of this ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities Issued March 2017 Ÿ Requires that premiums for certain callable debt securities held be amortized to their earliest call date. Ÿ Effective for Customers beginning after December 15, 2018, with early adoption permitted. Ÿ Adoption of this new guidance must be applied on a modified retrospective approach. Ÿ Customers adopted this ASU on January 1, 2019. The adoption of this ASU did not have a significant impact on Customers' financial condition, results of operations and consolidated financial statements. Accounting Standards Adopted on January 1, 2019 (continued) Standard Summary of guidance Effects on Financial Statements ASU 2016-02, Leases Issued February 2016 Ÿ Supersedes the current lease accounting guidance for both lessees and lessors under ASC 840, Leases. Ÿ From the lessee's perspective, the new standard establishes a ROU model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Ÿ Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement for lessees. Ÿ This ASU will require lessors to account for leases using an approach that is substantially similar to the existing guidance for sales-type, direct financing leases and operating leases. Ÿ Effective beginning after December 15, 2018 with early adoption permitted. Ÿ In July 2018, the FASB issued ASU 2018-11 “Leases (Topic 842): Targeted Improvements,” which provides lessees the option to apply the new leasing standard to all open leases as of the adoption date. Prior to this ASU issuance, a modified retrospective transition approach was required. Ÿ In December 2018, the FASB issued ASU 2018-20 "Leases (Topic 842): Narrow-Scope Improvements for Lessors," which provides lessors a policy election to not evaluate whether certain sales taxes and other similar taxes are lessor costs or lessee costs. Additionally, the update requires certain lessors to exclude from variable payments lessor costs paid by lessees directly to third parties. Ÿ Customers adopted this ASU on January 1, 2019. Ÿ Customers recognized a lease liability and a corresponding ROU asset of approximately $25 million at January 1, 2019. The increase in assets is expected to lower Customers' regulatory capital ratios by approximately four basis points. Ÿ Customers does not expect material changes to the recognition of operating lease expense in its consolidated statements of income. Ÿ Customers adopted certain practical expedients available under the new guidance, which will not require it to (1) reassess whether any expired or existing contracts contain leases, (2) reassess the lease classification for any expired or existing leases, (3) reassess initial direct costs for any existing leases, and (4) evaluate whether certain sales taxes and other similar taxes are lessor costs. Additionally, Customers elected to apply the new lease guidance at the adoption date, rather than at the beginning of the earliest period presented and will continue to present the comparative periods under Topic 840. Customers did not adopt the hindsight practical expedient. Accounting Standards Issued But Not Yet Adopted Standard Summary of guidance Effects on Financial Statements ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606 Ÿ 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. Ÿ 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. Ÿ 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. Ÿ Effective for fiscal year beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. Ÿ Customers is currently evaluating the expected impact of this ASU on its financial condition, results of operations and consolidated 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 Ÿ 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. Ÿ Also clarifies that capitalized implementation costs of a hosting arrangement that is a service contract are to be amortized over the term of the hosting arrangement, which includes the noncancelable period of the arrangement plus options to extend the arrangement if reasonably certain to exercise. Ÿ Clarifies that existing impairment guidance in Subtopic 350-40 must be applied to the capitalized implementation costs as if they were long-lived assets. Ÿ Applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Ÿ Effective for fiscal year beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption permitted. Ÿ Customers is currently evaluating the expected impact of this ASU on its financial condition, results of operations and consolidated financial statements. Standard Summary of guidance Effects on Financial Statements ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments Issued June 2016 Ÿ Requires an entity to utilize a new impairment model known as the current expected credit loss model to estimate lifetime expected credit loss and record an allowance that, when deducted from the amortized cost basis of the financial asset (including HTM securities), presents the net amount expected to be collected on the financial asset. Ÿ Replaces today's "incurred loss" approach and is expected to result in earlier recognition of credit losses. Ÿ For available-for-sale debt securities, entities will be required to record allowances for credit losses rather than reduce the carrying amount, as they do today under the OTTI model, and will be allowed to reverse previously established allowances in the event the credit of the issuer improves. Ÿ Simplifies the accounting model for PCI debt securities and loans. Ÿ Effective beginning after December 15, 2019 with early adoption permitted. Ÿ Adoption can be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Ÿ Customers has established a company-wide, cross-discipline governance structure, which provides implementation oversight and continues evaluating the impact of this ASU and reviewing the loss modeling requirements consistent with lifetime expected loss estimates. Ÿ Customers has selected a third-party vendor to assist in the implementation process of its new model, which will include different assumptions used in calculating credit losses, such as estimating losses over the estimated life of a financial asset and will consider expected future changes in macroeconomic conditions. Ÿ Customers continues to evaluate data requirements, methodologies, and forecasting options to utilize within the new model. Additionally, Customers is evaluating how to properly segment its loan portfolio. Ÿ Customers has completed preliminary runs of the new model and continues to evaluate the results as it prepares to run two methodologies parallel in 2019. Ÿ The adoption of this ASU may result in an increase to Customers' allowance for loan losses which will depend upon the nature and characteristics of Customers' loan portfolio at the adoption date, as well as the macroeconomic conditions and forecasts at that date. Ÿ Customers does not intend to early adopt this new guidance.
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. FASB 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. However, many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under the FASB 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 (i.e., 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 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.

Significant Accounting Polici_3

Significant Accounting Policies and Basis of Presentation Tables (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Future Minimum Rental Commitments under Non-Cancelable Leases	The following table presents the future lease nonresidual rental payments due from customers for equipment on operating leases: December 31, 2018 (amounts in thousands) 2019 $ 8,347 2020 9,735 2021 8,810 2022 5,815 2023 3,663 Thereafter 2,518 Total minimum payments $ 38,888 Future minimum rental commitments pursuant to non-cancelable leases as of December 31, 2018 , were as follows: December 31, 2018 (amounts in thousands) 2019 $ 5,577 2020 5,135 2021 4,513 2022 3,885 2023 2,856 Thereafter 4,699 Total minimum payments $ 26,665

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Components of Earnings Per Share	The following are the components and results of Customers' earnings per common share calculations for the periods presented. For the Years Ended December 31, 2018 2017 2016 (amounts in thousands, except share and per share data) Net income available to common shareholders $ 57,236 $ 64,378 $ 69,187 Weighted-average number of common shares outstanding – basic 31,570,118 30,659,320 27,596,020 Share-based compensation plans 658,739 1,917,451 2,221,517 Warrants 4,241 19,906 196,113 Weighted-average number of common shares – diluted 32,233,098 32,596,677 30,013,650 Basic earnings per common share $ 1.81 $ 2.10 $ 2.51 Diluted earnings per common share 1.78 1.97 2.31
Anti-dilutive Securities Excluded from Computation of Earnings Per Share	The following is a summary of 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. For the Years Ended December 31, 2018 2017 2016 Anti-dilutive securities: Share-based compensation plans 1,138,251 1,059,225 894,720 Warrants — — 52,242 Total anti-dilutive securities 1,138,251 1,059,225 946,962

Changes In Accumulated Other _2

Changes In Accumulated Other Comprehensive Income (Loss) By Component (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2018 and 2017 . All amounts are presented net of tax. Amounts in parentheses indicate reductions to AOCI. Available-for-Sale Securities (amounts in thousands) Unrealized Gains (Losses) Foreign Currency Items Total Unrealized Gains (Losses) Unrealized Gains (Losses) on Cash Flow Hedges Total Balance, December 31, 20 16 $ (2,681 ) $ — $ (2,681 ) $ (2,211 ) $ (4,892 ) Current period: Other comprehensive income before reclassifications 7,800 88 7,888 406 8,294 Amounts reclassified from accumulated other comprehensive income to net income (1) (5,368 ) — (5,368 ) 1,607 (3,761 ) Net current-period other comprehensive income 2,432 88 2,520 2,013 4,533 Balance, December 31, 2017 (249 ) 88 (161 ) (198 ) (359 ) Reclassification of the income tax effects of the Tax Cuts and Jobs Act (2) (256 ) — (256 ) (42 ) (298 ) Reclassification of the of net unrealized gains on equity securities (2) (953 ) (88 ) (1,041 ) — (1,041 ) Balance after reclassification adjustments on January 1, 2018 (1,458 ) — (1,458 ) (240 ) (1,698 ) Current period: Other comprehensive income (loss) before reclassifications (34,091 ) — (34,091 ) 1,477 (32,614 ) Amounts reclassified from accumulated other comprehensive income (loss) to net income (1) 13,808 — 13,808 (2,159 ) 11,649 Net current-period other comprehensive income (loss) (20,283 ) — (20,283 ) (682 ) (20,965 ) Balance, December 31, 2018 $ (21,741 ) $ — $ (21,741 ) $ (922 ) $ (22,663 ) (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. During the years ended December 31, 2018 and 2017 , reclassification amounts of $18.7 million ( $13.8 million net of taxes), and $8.8 million ( $5.4 million net of taxes) were reported as loss and gains on sale of investment securities on the consolidated statements of income, respectively. Impairment losses recorded during the year ended December 31, 2017 were not previously deferred in accumulated other comprehensive income (loss) because Customers decided to sell the securities as of December 31, 2016. Reclassification amounts for cash flow hedges are reported as either interest expense on FHLB advances on the consolidated statements of income or other non-interest income on the consolidated statements of income for gains recognized from the discontinuance of cash flow hedge accounting for certain interest rate swaps. During the year ended December 31, 2018 , a reclassification amount of $95 thousand ( $70 thousand net of taxes) was reported as a reduction to interest expense on FHLB advances on the consolidated statements of income. A reclassification amount of $2.8 million ( $2.1 million net of taxes) was reported as other non-interest income on the consolidated statements of income from the discontinuance of cash flow hedge accounting for certain interest rate swaps. During the year ended December 31, 2017, a reclassification amount of $2.6 million ( $1.6 million net of taxes) was reported as interest expense on FHLB advances on the consolidated statements of income. (2) Amounts reclassified from accumulated other comprehensive income (loss) on January 1, 2018 as a result of the adoption of ASU 2018-02 and ASU 2016-01 resulted in a decrease in accumulated other comprehensive income of $1.3 million and a corresponding increase in retained earnings for the same amount. See NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for more information.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Approximate Fair Value of Investment Securities	The amortized cost and approximate fair value of investment securities as of December 31, 2018 and 2017 , are summarized as follows: December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 311,267 $ — $ (5,893 ) $ 305,374 Corporate notes (1) 381,407 920 (24,407 ) 357,920 Available-for-sale debt securities $ 692,674 $ 920 $ (30,300 ) 663,294 Equity securities (2) 1,718 Total investment securities, at fair value $ 665,012 (1) Includes corporate securities issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity that are being measured at fair value with changes in fair value recognized directly in earnings effective January 1, 2018 as a result of adopting ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (see NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION for additional information related to the adoption of this new standard). December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available-for-sale securities Agency-guaranteed residential mortgage-backed securities $ 186,221 $ 36 $ (2,799 ) $ 183,458 Agency-guaranteed commercial real estate mortgage-backed securities 238,809 432 (769 ) 238,472 Corporate notes (1) 44,959 1,130 — 46,089 Equity securities (2) 2,311 1,041 — 3,352 Total available-for-sale securities, at fair value $ 472,300 $ 2,639 $ (3,568 ) $ 471,371 (1) Includes subordinated debt issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity.
Statement of Proceeds from Sale of Available for Sale Investment Securities	The following table shows proceeds from the sale of available-for-sale securities, gross gains and gross losses on those sales of securities: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Proceeds from sale of available-for-sale securities $ 476,182 $ 769,203 $ 2,852 Gross gains $ — $ 8,808 $ 26 Gross losses (18,659 ) (8 ) (1 ) Net (losses) gains $ (18,659 ) $ 8,800 $ 25
Summary of Investment Securities by Stated Maturity	The following table shows available-for-sale debt securities by stated maturity. Debt securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and are, therefore, classified separately with no specific maturity date: December 31, 2018 Available for Sale Amortized Cost Fair Value (amounts in thousands) Due in one year or less $ — $ — Due after one year through five years — — Due after five years through ten years 329,096 308,578 Due after ten years 52,311 49,342 Agency-guaranteed residential mortgage-backed securities 311,267 305,374 Total available-for-sale debt securities $ 692,674 $ 663,294
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category	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 December 31, 2018 and 2017 were as follows: December 31, 2018 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 305,374 $ (5,893 ) $ — $ — $ 305,374 $ (5,893 ) Corporate notes (1) 310,036 (24,407 ) — — 310,036 (24,407 ) Total $ 615,410 $ (30,300 ) $ — $ — $ 615,410 $ (30,300 ) (1) Includes corporate securities issued by other bank holding companies. December 31, 2017 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (amounts in thousands) Available-for-sale debt securities Agency-guaranteed residential mortgage-backed securities $ 104,861 $ (656 ) $ 66,579 $ (2,143 ) $ 171,440 $ (2,799 ) Agency-guaranteed commercial mortgage-backed securities 115,970 (740 ) 6,151 (29 ) 122,121 (769 ) Total $ 220,831 $ (1,396 ) $ 72,730 $ (2,172 ) $ 293,561 $ (3,568 )

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables Held-for-sale [Abstract]
Composition of Loans Held for Sale	The composition of loans held for sale as of December 31, 2018 and 2017 , was as follows: December 31, 2018 2017 (amounts in thousands) Commercial loans: Multi-family loans, at lower of cost or fair value $ — $ 144,191 Total commercial loans held for sale — 144,191 Consumer loans: Residential mortgage loans, at fair value 1,507 1,886 Loans held for sale $ 1,507 $ 146,077

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Schedule of Loans Receivable	The following table presents loans receivable as of December 31, 2018 and 2017 : December 31, 2018 2017 (amounts in thousands) Loans receivable, mortgage warehouse, at fair value $ 1,405,420 $ 1,793,408 Loans receivable: Commercial: Multi-family 3,285,297 3,502,381 Commercial and industrial (including owner occupied commercial real estate) 1,951,277 1,633,818 Commercial real estate non-owner occupied 1,125,106 1,218,719 Construction 56,491 85,393 Total commercial loans receivable 6,418,171 6,440,311 Consumer: Residential real estate 566,561 234,090 Manufactured housing 79,731 90,227 Other 74,035 3,547 Total consumer loans receivable 720,327 327,864 Loans receivable 7,138,498 6,768,175 Deferred (fees) costs and unamortized (discounts) premiums, net (424 ) 83 Allowance for loan losses (39,972 ) (38,015 ) Total loans receivable, net of allowance for loan losses $ 8,503,522 $ 8,523,651
Loans Receivable by Class and Performance Status	The following tables summarize loans receivable by loan type and performance status as of December 31, 2018 and 2017 : December 31, 2018 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 (3) Total Loans (4) (amounts in thousands) Multi-family $ — $ — $ — $ 1,155 $ 3,282,452 $ 1,690 $ 3,285,297 Commercial and industrial 1,914 — 1,914 17,764 1,353,586 536 1,373,800 Commercial real estate owner occupied 193 — 193 1,037 567,809 8,438 577,477 Commercial real estate non-owner occupied 1,190 — 1,190 129 1,119,443 4,344 1,125,106 Construction — — — — 56,491 — 56,491 Residential real estate 5,940 — 5,940 5,605 550,679 4,337 566,561 Manufactured housing (5) 3,926 2,188 6,114 1,693 69,916 2,008 79,731 Other consumer 200 — 200 111 73,503 221 74,035 Total $ 13,363 $ 2,188 $ 15,551 $ 27,494 $ 7,073,879 $ 21,574 $ 7,138,498 December 31, 2017 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 (3) Total Loans (4) (amounts in thousands) Multi-family $ 4,900 $ — $ 4,900 $ — $ 3,495,600 $ 1,881 $ 3,502,381 Commercial and industrial 103 — 103 17,392 1,130,831 764 1,149,090 Commercial real estate owner occupied 202 — 202 1,453 472,501 10,572 484,728 Commercial real estate non-owner occupied 93 — 93 160 1,213,216 5,250 1,218,719 Construction — — — — 85,393 — 85,393 Residential real estate 7,628 — 7,628 5,420 215,361 5,681 234,090 Manufactured housing (5) 4,028 2,743 6,771 1,959 78,946 2,551 90,227 Other consumer 116 — 116 31 3,184 216 3,547 Total $ 17,070 $ 2,743 $ 19,813 $ 26,415 $ 6,695,032 $ 26,915 $ 6,768,175 (1) Includes past-due loans that are accruing interest because collection is considered probable. (2) Loans where next payment due is less than 30 days from the report date. (3) 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. (4) Amounts exclude deferred costs and fees, unamortized premiums and discounts, and the allowance for loan losses. (5) Manufactured housing loans purchased in 2010 are supported by cash reserves held at the Bank that are used to fund past-due payments when the loan becomes 90 days or more delinquent. Subsequent purchases are subject to varying provisions in the event of borrowers’ delinquencies.
Schedule of Allowance for Loan Losses	The changes in the allowance for loan losses for the years ended December 31, 2018 and 2017 , and the loans and allowance for loan losses by loan type based on impairment-evaluation method are presented in the tables below. Twelve months ended December 31, 2018 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (amounts in thousands) Ending Balance, $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015 Charge-offs — (1,722 ) (747 ) — — (466 ) — (1,822 ) (4,757 ) Recoveries — 403 326 5 241 76 — 21 1,072 Provision for loan losses (706 ) 2,546 509 (1,349 ) (596 ) 1,115 (35 ) 4,158 5,642 Ending Balance, $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 As of December 31, 2018 Loans: Individually evaluated for impairment $ 1,155 $ 17,828 $ 1,069 $ 129 $ — $ 8,631 $ 10,195 $ 111 $ 39,118 Collectively evaluated for impairment 3,282,452 1,355,436 567,970 1,120,633 56,491 553,593 67,528 73,703 7,077,806 Loans acquired with credit deterioration 1,690 536 8,438 4,344 — 4,337 2,008 221 21,574 Total loans receivable $ 3,285,297 $ 1,373,800 $ 577,477 $ 1,125,106 $ 56,491 $ 566,561 $ 79,731 $ 74,035 $ 7,138,498 Allowance for loan losses: Individually evaluated for impairment $ 539 $ 261 $ 1 $ — $ — $ 41 $ 3 $ — $ 845 Collectively evaluated for impairment 10,923 11,516 3,319 4,161 624 3,227 89 2,390 36,249 Loans acquired with credit deterioration — 368 — 1,932 — 386 53 139 2,878 Allowance for loan losses $ 11,462 $ 12,145 $ 3,320 $ 6,093 $ 624 $ 3,654 $ 145 $ 2,529 $ 39,972 Twelve months ended December 31, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (amounts in thousands) Ending Balance, $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315 Charge-offs — (4,157 ) (731 ) (486 ) — (415 ) — (1,338 ) (7,127 ) Recoveries — 676 9 — 164 72 — 138 1,059 Provision for loan losses 566 3,349 1,771 29 (25 ) (70 ) (106 ) 1,254 6,768 Ending Balance, $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015 Loans: Individually evaluated for impairment $ — $ 17,461 $ 1,448 $ 160 $ — $ 9,247 $ 10,089 $ 30 $ 38,435 Collectively evaluated for impairment 3,500,500 1,130,865 472,708 1,213,309 85,393 219,162 77,587 3,301 6,702,825 Loans acquired with credit deterioration 1,881 764 10,572 5,250 — 5,681 2,551 216 26,915 Total loans receivable $ 3,502,381 $ 1,149,090 $ 484,728 $ 1,218,719 $ 85,393 $ 234,090 $ 90,227 $ 3,547 $ 6,768,175 Allowance for loan losses: Individually evaluated for impairment $ — $ 650 $ 642 $ — $ — $ 155 $ 4 $ — $ 1,451 Collectively evaluated for impairment 12,168 9,804 2,580 4,630 979 2,177 82 117 32,537 Loans acquired with credit deterioration — 464 10 2,807 — 597 94 55 4,027 Allowance for loan losses $ 12,168 $ 10,918 $ 3,232 $ 7,437 $ 979 $ 2,929 $ 180 $ 172 $ 38,015
Summary of Impaired Loans	Purchased-credit-impaired loans are considered to be performing and are not included in the tables below. December 31, 2018 Twelve Months Ended, Recorded Investment Net of Charge Offs Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (amounts in thousands) With no related allowance recorded: Multi-family $ — $ — $ — $ 537 $ 8 Commercial and industrial 13,660 15,263 — 8,831 673 Commercial real estate owner occupied 1,037 1,766 — 776 19 Commercial real estate non-owner occupied 129 241 — 645 48 Residential real estate 4,842 5,128 — 4,129 151 Manufactured housing 10,027 10,027 — 10,015 561 Other consumer 111 111 — 89 1 With an allowance recorded: Multi-family 1,155 1,155 539 231 37 Commercial and industrial 4,168 4,351 261 6,504 25 Commercial real estate owner occupied 32 32 1 443 3 Residential real estate 3,789 3,789 41 4,566 131 Manufactured housing 168 168 3 214 14 Total $ 39,118 $ 42,031 $ 845 $ 36,980 $ 1,671 December 31, 2017 Twelve Months Ended, Twelve Months Ended, Recorded Investment Net of Charge Offs Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (amounts in thousands) With no related allowance recorded: Multi-family $ — $ — $ — $ — $ — $ 964 $ 53 Commercial and industrial 9,138 9,287 — 8,865 214 15,424 804 Commercial real estate owner occupied 806 806 — 1,439 70 7,963 426 Commercial real estate non-owner occupied 160 272 — 898 2 5,265 155 Residential real estate 3,628 3,801 — 4,617 24 4,567 120 Manufactured housing 9,865 9,865 — 10,003 558 8,961 465 Other consumer 30 30 — 51 — 47 — With an allowance recorded: Multi-family — — — — — 232 — Commercial and industrial 8,323 8,506 650 5,984 230 7,028 436 Commercial real estate owner occupied 642 642 642 882 — 173 — Commercial real estate non-owner occupied — — — — — 380 — Residential real estate 5,619 5,656 155 3,307 187 395 — Manufactured housing 224 224 4 131 8 — — Other consumer — — — — — 29 — Total $ 38,435 $ 39,089 $ 1,451 $ 36,177 $ 1,293 $ 51,428 $ 2,459
Schedule of Total TDRs Based on Loan Type and Accrual Status [Policy Text Block]	The following table presents total TDRs based on loan type and accrual status at December 31, 2018 , 2017 , and 2016 . Nonaccrual TDRs are included in the reported amount of total non-accrual loans. December 31, 2018 2017 2016 Accruing TDRs Nonaccrual TDRs Total Accruing TDRs Nonaccrual TDRs Total Accruing TDRs Nonaccrual TDRs Total (amounts in thousands) Commercial and industrial $ 64 $ 5,273 $ 5,337 $ 63 $ 5,939 $ 6,002 $ 73 $ 146 $ 219 Commercial real estate owner occupied 32 — 32 — — — 12 — 12 Commercial real estate non-owner occupied — — — — — — — 1,945 1,945 Residential real estate 3,026 667 3,693 3,828 703 4,531 4,012 707 4,719 Manufactured housing 8,502 1,620 10,122 8,130 1,766 9,896 7,429 2,072 9,501 Other consumer — 12 12 — — — — — — Total TDRs $ 11,624 $ 7,572 $ 19,196 $ 12,021 $ 8,408 $ 20,429 $ 11,526 $ 4,870 $ 16,396
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 years ended December 31, 2018 , 2017 and 2016 . There were no modifications that involved forgiveness of debt for the years ended December 31, 2018 , 2017 and 2016 . For the Years Ended December 31, 2018 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Extensions of maturity 2 $ 60 5 $ 6,497 3 $ 1,995 Interest-rate reductions 39 1,615 35 1,574 61 4,621 Total 41 $ 1,675 40 $ 8,071 64 $ 6,616
Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments	The following table provides, by loan type, the number of loans modified in TDRs and the related recorded investment for the years ended December 31, 2018 , 2017 and 2016 . For the Years Ended December 31, 2018 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Commercial and industrial — $ — 4 $ 6,437 1 $ 76 Commercial real estate non-owner occupied — — — — 1 1,844 Residential real estate 2 352 — — 4 2,410 Manufactured housing 38 1,310 36 1,634 58 2,286 Other consumer 1 13 — — — — Total loans 41 $ 1,675 40 $ 8,071 64 $ 6,616
Changes in Accretable Discount Related to Purchased Credit Impaired Loans	The changes in accretable yield related to PCI loans for the years ended December 31, 2018 , 2017 and 2016 , were as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Accretable yield balance, beginning of period $ 7,825 $ 10,202 $ 12,947 Accretion to interest income (1,455 ) (1,673 ) (3,760 ) Reclassification from nonaccretable difference and disposals, net (192 ) (704 ) 1,015 Accretable yield balance, end of period $ 6,178 $ 7,825 $ 10,202
Schedule of Changes in Allowance for Loans Losses	The following table presents changes in the allowance for loans losses and the FDIC loss sharing receivable, including the effect of the estimated Clawback liability for the years ended December 31, 2018 , 2017 and 2016 . Allowance for Loan Losses For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Ending balance as of December 31, $ 38,015 $ 37,315 $ 35,647 Provision for loan losses (1) 5,642 6,768 3,330 Charge-offs (4,757 ) (7,127 ) (4,405 ) Recoveries 1,072 1,059 2,743 Ending balance as of December 31, $ 39,972 $ 38,015 $ 37,315
Schedule of FDIC Loss Sharing Receivable	FDIC Loss Sharing Receivable For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Ending balance as of December 31, $ — $ — $ (2,083 ) Increased estimated cash flows (2) — — 289 Other activity, net (a) — — (255 ) Cash payments to the FDIC — — 2,049 Ending balance as of December 31, $ — $ — $ — (1) Provision for loan losses $ 5,642 $ 6,768 $ 3,330 (2) Effect attributable to FDIC loss sharing agreements — — (289 ) Net amount reported as provision for loan losses $ 5,642 $ 6,768 $ 3,041 (a) Includes external costs, such as legal fees, real estate taxes and appraisal expenses, that qualified for reimbursement under the loss sharing agreements.
Credit Quality Tables	The following tables present the credit ratings of loans receivable as of December 31, 2018 and 2017 . December 31, 2018 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (3) (amounts in thousands) Pass/Satisfactory $ 3,201,822 $ 1,306,466 $ 562,639 $ 1,054,493 $ 56,491 $ — $ — $ — $ 6,181,911 Special Mention 55,696 30,551 9,730 30,203 — — — — 126,180 Substandard 27,779 36,783 5,108 40,410 — — — — 110,080 Performing (1) — — — — — 555,016 71,924 73,724 700,664 Non-performing (2) — — — — — 11,545 7,807 311 19,663 Total $ 3,285,297 $ 1,373,800 $ 577,477 $ 1,125,106 $ 56,491 $ 566,561 $ 79,731 $ 74,035 $ 7,138,498 December 31, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Real Estate Non-Owner Occupied Construction Residential Real Estate Manufactured Housing Other Consumer Total (3) (amounts in thousands) Pass/Satisfactory $ 3,438,554 $ 1,118,889 $ 471,826 $ 1,185,933 $ 85,393 $ — $ — $ — $ 6,300,595 Special Mention 53,873 7,652 5,987 31,767 — — — — 99,279 Substandard 9,954 22,549 6,915 1,019 — — — — 40,437 Performing (1) — — — — — 221,042 81,497 3,400 305,939 Non-performing (2) — — — — — 13,048 8,730 147 21,925 Total $ 3,502,381 $ 1,149,090 $ 484,728 $ 1,218,719 $ 85,393 $ 234,090 $ 90,227 $ 3,547 $ 6,768,175
Schedule of Loan Purchases and Sales	Purchases and sales of loans were as follows for the years ended December 31, 2018, 2017 and 2016: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Purchases (1) Residential real estate $ 368,402 $ 264,090 $ — Other consumer 30,066 — — Total $ 398,468 $ 264,090 $ — Sales (2) Multi-family $ (54,638 ) $ (226,831 ) $ — Commercial and industrial (3) (32,263 ) (19,974 ) (23,731 ) Commercial real estate owner occupied (3) (20,218 ) (19,813 ) (15,342 ) Residential real estate — (191,574 ) — Other consumer — — — Total $ (107,119 ) $ (458,192 ) $ (39,073 ) (1) The purchase price was 99.9% and 99.4% of loans outstanding for the years ended December 31, 2018 and 2017 , respectively. There were no loan purchases during the year ended December 31, 2016 . (2) Loan sales resulted in a net gain of $3.3 million , $4.2 million and $3.7 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Components of Bank Premises and Equipment	The components of bank premises and equipment as of December 31, 2018 and 2017 , were as follows: December 31, Expected Useful Life 2018 2017 (amounts in thousands) Leasehold improvements 3 to 25 years $ 14,080 $ 14,028 Furniture, fixtures and equipment 5 to 10 years 7,110 6,447 IT equipment 3 to 5 years 8,645 8,002 Automobiles 3 to 5 years 455 506 30,290 28,983 Accumulated depreciation and amortization (19,227 ) (17,028 ) Total $ 11,063 $ 11,955
Future Minimum Rental Commitments under Non-Cancelable Leases	The following table presents the future lease nonresidual rental payments due from customers for equipment on operating leases: December 31, 2018 (amounts in thousands) 2019 $ 8,347 2020 9,735 2021 8,810 2022 5,815 2023 3,663 Thereafter 2,518 Total minimum payments $ 38,888 Future minimum rental commitments pursuant to non-cancelable leases as of December 31, 2018 , were as follows: December 31, 2018 (amounts in thousands) 2019 $ 5,577 2020 5,135 2021 4,513 2022 3,885 2023 2,856 Thereafter 4,699 Total minimum payments $ 26,665

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Components of Deposits	The components of deposits at December 31, 2018 and 2017 , were as follows: December 31, 2018 2017 (amounts in thousands) Demand, non-interest bearing $ 1,122,171 $ 1,052,115 Demand, interest bearing 803,948 523,848 Savings, including money market deposit accounts 3,481,936 3,318,486 Time, $100,000 and over 792,370 1,284,855 Time, other 941,811 620,838 Total deposits $ 7,142,236 $ 6,800,142
Schedule of Time Deposit Maturities	The scheduled maturities for time deposits at December 31, 2018 , were as follows: December 31, 2018 (amounts in thousands) 2019 $ 1,459,919 2020 172,903 2021 81,148 2022 17,147 2023 3,064 Total time deposits $ 1,734,181

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Short Term Borrowings	Short-term debt at December 31, 2018 and 2017 , was as follows: December 31, 2018 2017 Amount Rate Amount Rate (amounts in thousands) FHLB advances $ 1,248,070 2.62 % $ 1,611,860 1.47 % Federal funds purchased 187,000 2.60 % 155,000 1.50 % Total short-term debt $ 1,435,070 $ 1,766,860
Summary of Bancorps Short Term Borrowings	The following is a summary of additional information relating to Customers' short-term debt: December 31, 2018 2017 2016 (amounts in thousands) FHLB advances Maximum outstanding at any month end $ 2,622,165 $ 2,283,250 $ 1,697,800 Average balance during the year 1,526,180 1,415,755 965,293 Weighted-average interest rate during the year 2.05 % 1.44 % 0.95 % Federal funds purchased Maximum outstanding at any month end 195,000 238,000 137,000 Average balance during the year 156,652 163,466 84,514 Weighted-average interest rate during the year 1.92 % 1.19 % 0.58 %

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Statement of Weighted-Average Assumptions Used and Resulting Weighted-Average Fair Value of Option	The following table presents the weighted-average assumptions used and the resulting weighted-average fair value of each option granted for the periods presented. 2018 2017 2016 Weighted-average risk-free interest rate 2.87 % 2.35 % 1.84 % Expected dividend yield — % — % — % Weighted-average expected volatility 25.47 % 25.05 % 23.39 % Weighted-average expected life (in years) 7.00 7.00 7.00 Weighted-average fair value of each option granted $ 10.05 $ 8.68 $ 7.61
Summary of Stock Option Activity	The following table summarizes stock option activity for the year ended December 31, 2018 : Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term in Years Aggregate Intrinsic Value (dollars in thousands, except weighted-average exercise price) Outstanding, December 31, 2017 2,718,694 $ 21.52 Granted 10,000 29.48 Exercised (197,918 ) 14.06 $ 3,123 Forfeited (10,250 ) 21.96 Outstanding, December 31, 2018 2,520,526 $ 22.13 6.40 $ 2,311 Exercisable at December 31, 2018 849,303 $ 16.29 3.68 $ 2,276
Summary of Non-Vested Options	A summary of the status of Customers' non-vested options at December 31, 2018 , and changes during the year ended December 31, 2018 , is as follows: Options Weighted- Average exercise price Non-vested at December 31, 2017 2,621,731 $ 21.85 Granted 10,000 29.48 Vested (950,258 ) 16.22 Forfeited (10,250 ) 21.96 Non-vested at December 31, 2018 1,671,223 25.10
Status of Restricted Stock	The table below presents the status of the restricted stock units at December 31, 2018 , and changes during the year ended December 31, 2018 : Restricted Stock Units Weighted- Average Grant- Date Fair Value Outstanding and unvested at December 31, 2017 590,036 $ 24.74 Granted 433,614 23.63 Vested (97,414 ) 25.66 Forfeited (41,577 ) 27.05 Outstanding and unvested at December 31, 2018 884,659 23.99

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Components of Income Tax Expense	The components of income tax expense were as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Current $ 10,056 $ 29,924 $ 48,472 Deferred 9,303 15,118 (2,579 ) Income tax expense $ 19,359 $ 45,042 $ 45,893
Schedule of Income (Loss) Before Income Tax Expense (Benefit)	Effective tax rates differ from the federal statutory rate of 21% at December 31, 2018 , and at 35% at December 31, 2017 and 2016 , which was applied to income before income tax expense, due to the following: For the Years Ended December 31, 2018 2017 2016 Amount % of pretax income Amount % of pretax income Amount % of pretax income (amounts in thousands) Federal income tax at statutory rate $ 19,121 21.00 % $ 43,357 35.00 % $ 43,608 35.00 % State income tax, net of federal benefit 4,067 4.47 3,835 3.10 4,548 3.65 Tax-exempt interest, net of disallowance (360 ) (0.40 ) (381 ) (0.31 ) (237 ) (0.19 ) Bank-owned life insurance (1,547 ) (1.70 ) (2,675 ) (2.16 ) (1,716 ) (1.38 ) Equity-based compensation (547 ) (0.60 ) (10,741 ) (8.67 ) (3,659 ) (2.94 ) Non-deductible executive compensation 230 0.25 654 0.53 — — Unrecorded basis difference in foreign subsidiaries 343 0.38 4,527 3.65 2,830 2.27 Enactment of federal tax reform (21 ) (0.02 ) 5,505 4.44 — — Other (1,927 ) (2.12 ) 961 0.78 519 0.42 Effective income tax rate $ 19,359 21.26 % $ 45,042 36.36 % $ 45,893 36.83 %
Components of Net Deferred Tax Assets (Liabilities)	The following represents Customers' deferred tax asset and liabilities as December 31, 2018 and 2017 : December 31, 2018 2017 (amounts in thousands) Deferred tax assets Allowance for loan losses $ 10,449 $ 9,738 Net unrealized losses on securities 7,639 512 OREO write-downs 91 748 Non-accrual interest 539 515 Net operating losses 1,212 1,199 Deferred compensation 1,129 1,181 Equity-based compensation 4,049 2,748 Cash flow hedge 324 84 Incentive compensation 1,056 634 Net deferred loan fees 671 47 Other 3,028 2,215 Total deferred tax assets 30,187 19,621 Deferred tax liabilities Fair value adjustments on acquisitions (569 ) (618 ) Bank premises and equipment (884 ) (986 ) Lease adjustments (17,786 ) (4,899 ) Other (746 ) (980 ) Total deferred tax liabilities (19,985 ) (7,483 ) Net deferred tax asset $ 10,202 $ 12,138

Transactions with Executive O_2

Transactions with Executive Officers, Directors, and Principal Shareholders (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Schedule of Activity Relating to Loans	The activity relating to loans to such persons was as follows: For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Balance as of December 31, $ — $ 238 $ 220 Additions 27 99 1,160 Repayments (22 ) (337 ) (1,142 ) Balance as of December 31, $ 5 $ — $ 238

Financial Instruments with Of_2

Financial Instruments with Off-Balance-Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Financial Instruments Outstanding Contract Amounts Represent Credit Risk	As of December 31, 2018 and 2017 , the following off-balance sheet commitments, financial instruments and other arrangements were outstanding: December 31, 2018 2017 (amounts in thousands) Commitments to fund loans $ 345,608 $ 333,874 Unfunded commitments to fund mortgage warehouse loans 1,537,900 1,567,139 Unfunded commitments under lines of credit and credit cards 867,131 485,345 Letters of credit 55,659 39,890 Other unused commitments 4,822 6,679

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [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 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 December 31, 2018 Common equity Tier 1 (to risk-weighted assets) Customers Bancorp, Inc. $ 745,795 8.964 % $ 374,388 4.500 % N/A N/A $ 530,384 6.375 % Customers Bank $ 1,066,121 12.822 % $ 374,160 4.500 % $ 540,453 6.500 % $ 530,059 6.375 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 963,266 11.578 % $ 499,185 6.000 % N/A N/A $ 655,180 7.875 % Customers Bank $ 1,066,121 12.822 % $ 498,879 6.000 % $ 665,173 8.000 % $ 654,779 7.875 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,081,962 13.005 % $ 665,580 8.000 % N/A N/A $ 821,575 9.875 % Customers Bank $ 1,215,522 14.619 % $ 665,173 8.000 % $ 831,466 10.000 % $ 821,072 9.875 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 963,266 9.665 % $ 398,668 4.000 % N/A N/A $ 398,668 4.000 % Customers Bank $ 1,066,121 10.699 % $ 398,570 4.000 % $ 498,212 5.000 % $ 398,570 4.000 % December 31, 2017 Common equity Tier 1 (to risk-weighted assets) Customers Bancorp, Inc. $ 689,494 8.805 % $ 352,368 4.500 % N/A N/A $ 450,248 5.750 % Customers Bank $ 1,023,564 13.081 % $ 352,122 4.500 % $ 508,621 6.500 % $ 449,934 5.750 % Tier 1 capital (to risk-weighted assets) Customers Bancorp, Inc. $ 906,963 11.583 % $ 469,824 6.000 % N/A N/A $ 567,704 7.250 % Customers Bank $ 1,023,564 13.081 % $ 469,496 6.000 % $ 625,994 8.000 % $ 567,307 7.250 % Total capital (to risk-weighted assets) Customers Bancorp, Inc. $ 1,021,601 13.047 % $ 626,432 8.000 % N/A N/A $ 724,313 9.250 % Customers Bank $ 1,170,666 14.961 % $ 625,994 8.000 % $ 782,493 10.000 % $ 723,806 9.250 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 906,963 8.937 % $ 405,949 4.000 % N/A N/A $ 405,949 4.000 % Customers Bank $ 1,023,564 10.092 % $ 405,701 4.000 % $ 507,126 5.000 % $ 405,701 4.000 %

Disclosures about Fair Value _2

Disclosures about Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of Customers’ financial instruments at December 31, 2018 and 2017 were as follows: Carrying Amount Estimated Fair Value Fair Value Measurements at December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (amounts in thousands) Assets Cash and cash equivalents $ 62,135 $ 62,135 $ 62,135 $ — $ — Debt securities, available for sale 663,294 663,294 — 663,294 — Equity securities 1,718 1,718 1,718 — — Loans held for sale 1,507 1,507 — 1,507 — Total loans receivable, net of allowance for loan losses 8,503,522 8,481,128 — 1,405,420 7,075,708 FHLB, Federal Reserve Bank and other restricted stock 89,685 89,685 — 89,685 — Derivatives 14,693 14,693 — 14,624 69 Liabilities Deposits $ 7,142,236 $ 7,136,009 $ 5,408,055 $ 1,727,954 $ — Federal funds purchased 187,000 187,000 187,000 — — FHLB advances 1,248,070 1,248,046 998,070 249,976 — Other borrowings 123,871 121,718 — 121,718 — Subordinated debt 108,977 110,550 — 110,550 — Derivatives 16,286 16,286 — 16,286 — Carrying Amount Estimated Fair Value Fair Value Measurements at December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (amounts in thousands) Assets Cash and cash equivalents $ 146,323 $ 146,323 $ 146,323 $ — $ — Investment securities, available for sale 471,371 471,371 3,352 468,019 — Loans held for sale 146,077 146,251 — 1,886 144,365 Total loans receivable, net of allowance for loan losses 8,523,651 8,470,171 — 1,793,408 6,676,763 FHLB, Federal Reserve Bank, and other restricted stock 105,918 105,918 — 105,918 — Derivatives 9,752 9,752 — 9,692 60 Liabilities Deposits $ 6,800,142 $ 6,796,095 $ 4,894,449 $ 1,901,646 $ — Federal funds purchased 155,000 155,000 155,000 — — FHLB advances 1,611,860 1,611,603 881,860 729,743 — Other borrowings 186,497 193,557 65,072 128,485 — Subordinated debt 108,880 115,775 — 115,775 — Derivatives 10,074 10,074 — 10,074 —
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis	For financial assets and liabilities measured at fair value on a recurring and non-recurring basis, the fair value measurements by level within the fair value hierarchy used at December 31, 2018 and 2017 , were as follows: December 31, 2018 Fair Value Measurements at the End of the Reporting Period Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total (amounts in thousands) Measured at Fair Value on a Recurring Basis Assets Available-for-sale securities Agency-guaranteed residential mortgage-backed securities $ — $ 305,374 $ — $ 305,374 Corporate notes — 357,920 — 357,920 Equity securities 1,718 — — 1,718 Derivatives — 14,624 69 14,693 Loans held for sale – fair value option — 1,507 — 1,507 Loans receivable, mortgage warehouse – fair value option — 1,405,420 — 1,405,420 Total assets - recurring fair value measurements $ 1,718 $ 2,084,845 $ 69 $ 2,086,632 Liabilities Derivatives $ — $ 16,286 $ — $ 16,286 Measured at Fair Value on a Nonrecurring Basis Assets Impaired loans, net of specific reserves of $845 $ — $ — $ 10,876 $ 10,876 Other real estate owned — — 621 621 Total assets - nonrecurring fair value measurements $ — $ — $ 11,497 $ 11,497 December 31, 2017 Fair Value Measurements at the End of the Reporting Period Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (amounts in thousands) Measured at Fair Value on a Recurring Basis Assets Available-for-sale securities: Agency-guaranteed residential mortgage-backed securities $ — $ 183,458 $ — $ 183,458 Agency-guaranteed commercial mortgage-backed securities — 238,472 — 238,472 Corporate notes — 46,089 — 46,089 Equity securities 3,352 — — 3,352 Derivatives — 9,692 60 9,752 Loans held for sale – fair value option — 1,886 — 1,886 Loans receivable, mortgage warehouse – fair value option — 1,793,408 — 1,793,408 Total assets - recurring fair value measurements $ 3,352 $ 2,273,005 $ 60 $ 2,276,417 Liabilities Derivatives $ — $ 10,074 $ — $ 10,074 Measured at Fair Value on a Nonrecurring Basis Assets Impaired loans, net of specific reserves of $1,451 $ — $ — $ 13,902 $ 13,902 Other real estate owned — — 1,449 1,449 Total assets - nonrecurring fair value measurements $ — $ — $ 15,351 $ 15,351
Statement of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and 2017 , are summarized as follows in the tables below. Additional information about residential mortgage loan commitments can be found in NOTE 19 — DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES. For the Years Ended December 31, 2018 2017 Residential Mortgage Loan Commitments (amounts in thousands) Balance at December 31, $ 60 $ 45 Issuances 407 360 Settlements (398 ) (345 ) Balance at December 31, $ 69 $ 60
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 December 31, 2018 and 2017 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 December 31, 2018 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted (dollars in thousands) Impaired loans - real estate $ 10,260 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Impaired loans - Commercial & Industrial 616 Business asset valuation (3) Business asset valuation adjustments (4) 8% - 50% Other real estate owned 621 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Residential mortgage loan commitments 69 Adjusted market bid Pull-through rate 90% - 90% Quantitative Information about Level 3 Fair Value Measurements December 31, 2017 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted (dollars in thousands) Impaired loans $ 13,902 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Other real estate owned 1,449 Collateral appraisal (1) Liquidation expenses (2) 8% - 8% Residential mortgage loan commitments 60 Adjusted market bid Pull-through rate 90% - 90% (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. The Bank 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)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The following table presents the fair value of Customers’ derivative financial instruments as well as their presentation on the consolidated balance sheets at December 31, 2018 and 2017 . December 31, 2018 Derivative Assets Derivative Liabilities Balance Sheet Location Fair Value Balance Sheet Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges Interest rate swaps Other assets $ 256 Other liabilities $ 1,502 Total $ 256 $ 1,502 Derivatives not designated as hedging instruments Interest rate swaps Other assets $ 14,300 Other liabilities $ 14,730 Credit contracts Other assets 68 Other liabilities 54 Residential mortgage loan commitments Other assets 69 Other liabilities — Total $ 14,437 $ 14,784 December 31, 2017 Derivative Assets Derivative Liabilities Balance Sheet Location Fair Value Balance Sheet Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges Interest rate swaps Other assets $ 816 Other liabilities $ 1,140 Total $ 816 $ 1,140 Derivatives not designated as hedging instruments Interest rate swaps Other assets $ 8,776 Other liabilities $ 8,897 Credit contracts Other assets 100 Other liabilities 37 Residential mortgage loan commitments Other assets 60 Other liabilities — Total $ 8,936 $ 8,934
Effect of Derivative Instruments on Comprehensive Income	The following table presents the effect of Customers' derivative financial instruments on comprehensive income for the years ended December 31, 2018 , 2017 and 2016 . For the Year Ended December 31, 2018 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps (1) Other non-interest income $ 3,409 Credit contracts Other non-interest income 127 Residential mortgage loan commitments Mortgage banking income 9 Total $ 3,545 (1) Includes income recognized from the termination of interest rate swaps. For the Year Ended December 31, 2017 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps Other non-interest income $ 604 Credit contracts Other non-interest income 171 Residential mortgage loan commitments Mortgage banking income 15 Total $ 790 For the Year Ended December 31, 2016 Income Statement Location Amount of Income Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments Interest rate swaps Other non-interest income $ 2,955 Credit contracts Other non-interest income 163 Residential mortgage loan commitments Mortgage banking income — Total $ 3,118 For the Year Ended December 31, 2018 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 (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 1,477 Interest expense $ 95 Other non-interest income (2) 2,822 $ 2,917 (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. (2) Includes income recognized from the termination of interest rate swaps. For the Year Ended December 31, 2017 Location of Gain Amount of Gain (Loss) Amount of Gain (Loss) (Loss) Reclassified Reclassified from Recognized in OCI on from Accumulated Accumulated OCI into Derivatives (1) OCI into Income Income (amounts in thousands) Derivative in cash flow hedging relationship: Interest rate swaps $ 406 Interest expense $ (2,634 ) (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 Year Ended December 31, 2016 Location of Gain Amount of Gain (Loss) Amount of Gain (Loss) (Loss) Reclassified Reclassified from Recognized in OCI on from Accumulated Accumulated OCI into Derivatives (1) OCI into Income Income (amounts in thousands) Derivative in cash flow hedging relationship: Interest rate swaps $ (629 ) Interest expense $ (1,946 ) (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.
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 with institutional counterparties are subject to master netting arrangements and are included in the table below. Interest rate swaps 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. Offsetting of Financial Assets and Derivative Assets at December 31, 2018 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 7,529 $ — $ 7,529 $ — $ 1,860 $ 5,669 Offsetting of Financial Assets and Derivative Assets at December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 5,930 $ — $ 5,930 $ — $ 5,070 $ 860
Summary of Offsetting of Financial Liabilities and Derivative Liabilities	Offsetting of Financial Liabilities and Derivative Liabilities at December 31, 2018 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 9,077 $ — $ 9,077 $ — $ 702 $ 8,375 Offsetting of Financial Liabilities and Derivative Liabilities at December 31, 2017 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 5,058 $ — $ 5,058 $ — $ 4,872 $ 186

Condensed Financial Statement_2

Condensed Financial Statements of Parent Company (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Summary of Condensed Balance Sheets of Parent Company	Balance Sheets December 31, 2018 2017 (amounts in thousands) Assets Cash in subsidiary bank $ 16,684 $ 67,231 Investments in and receivables due from subsidiaries 1,061,389 1,039,883 Other assets 3,417 3,160 Total assets $ 1,081,490 $ 1,110,274 Liabilities and Shareholders' equity Borrowings $ 123,871 $ 186,497 Other liabilities 803 2,813 Total liabilities 124,674 189,310 Shareholders' equity 956,816 920,964 Total Liabilities and Shareholders' Equity $ 1,081,490 $ 1,110,274
Summary of Condensed Income Statements of Parent Company	Income and Comprehensive Income Statements For the Years Ended December 31, 2018 2017 2016 (amounts in thousands) Operating income: Other, including dividends from Bank $ 45,422 $ 38,200 $ 25,400 Total operating income 45,422 38,200 25,400 Operating expense: Interest 8,178 7,984 5,854 Other 1,722 1,742 4,570 Total operating expense 9,900 9,726 10,424 Income before taxes and undistributed income of subsidiaries 35,522 28,474 14,976 Income tax benefit 2,335 3,620 3,961 Income before undistributed income of subsidiaries 37,857 32,094 18,937 Equity in undistributed income of subsidiaries 33,838 46,743 59,765 Net income 71,695 78,837 78,702 Preferred stock dividends 14,459 14,459 9,515 Net income available to common shareholders 57,236 64,378 69,187 Comprehensive income $ 50,730 $ 83,370 $ 81,794
Summary of Condensed Statements of Cash Flows of Parent Company	Statements of Cash Flows For the Years Ended December 31, (amounts in thousands) 2018 2017 2016 Cash Flows from Operating Activities: Net income $ 71,695 $ 78,837 $ 78,702 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries, net of dividends received from Bank (33,838 ) (46,743 ) (59,765 ) Loss on sale of available for sale investment securities — — 1 (Increase) decrease in other assets (256 ) 7,624 (7,721 ) (Decrease) increase in other liabilities (251 ) (1,322 ) 54 Net Cash Provided By Operating Activities 37,350 38,396 11,271 Cash Flows from Investing Activities: Proceeds from sales of investment securities available for sale — — 4 Payments for investments in and advances to subsidiaries (29 ) (98,725 ) (230,872 ) Net Cash Used in Investing Activities (29 ) (98,725 ) (230,868 ) Cash Flows from Financing Activities: Proceeds from issuance of common stock 3,585 2,716 70,985 Proceeds from issuance of preferred stock — — 161,902 (Repayment of) proceeds from issuance of long-term debt (63,250 ) 98,564 — Exercise and redemption of warrants 112 1,059 1,532 Purchase of common stock - repurchase program (12,976 ) — — Payments of employee taxes withheld from share-based awards (880 ) (14,761 ) (5,897 ) Preferred stock dividends paid (14,459 ) (14,459 ) (9,051 ) Net Cash (Used in) Provided by Financing Activities (87,868 ) 73,119 219,471 Net (Decrease) Increase in Cash and Cash Equivalents (50,547 ) 12,790 (126 ) Cash and Cash Equivalents - Beginning 67,231 54,441 54,567 Cash and Cash Equivalents - Ending $ 16,684 $ 67,231 $ 54,441

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following table presents selected quarterly data for the years ended December 31, 2018 and 2017 . 2018 Quarter Ended December 31 September 30 June 30 March 31 (amounts in thousands, except per share data) Interest income $ 103,303 $ 110,045 $ 107,639 $ 96,964 Interest expense 41,779 46,044 40,317 31,933 Net interest income 61,524 64,001 67,322 65,031 Provision for loan losses 1,385 2,924 (784 ) 2,117 Non-interest income (1) 19,877 2,084 16,127 20,910 Non-interest expenses 57,045 57,104 53,750 52,280 Income before income taxes 22,971 6,057 30,483 31,544 Provision for income taxes 5,109 28 6,820 7,402 Net income 17,862 6,029 23,663 24,142 Preferred stock dividends 3,615 3,615 3,615 3,615 Net income available to common shareholders $ 14,247 $ 2,414 $ 20,048 $ 20,527 Earnings per common share: Basic earnings per common share $ 0.45 $ 0.08 $ 0.64 $ 0.65 Diluted earnings per common share $ 0.44 $ 0.07 $ 0.62 $ 0.64 (1) The quarter ended September 30, 2018 included an $18.7 million loss on sale of investment securities. 2017 Quarter Ended December 31 September 30 June 30 March 31 (amounts in thousands, except per share data) Interest income $ 97,619 $ 98,285 $ 93,852 $ 83,094 Interest expense 29,319 30,266 25,246 20,676 Net interest income 68,300 68,019 68,606 62,418 Provision for loan losses 831 2,352 535 3,050 Non-interest income 19,740 18,026 18,391 22,754 Non-interest expenses 54,788 61,040 50,413 49,366 Income before income taxes 32,421 22,653 36,049 32,756 Provision for income taxes 10,806 14,899 12,327 7,009 Net income 21,615 7,754 23,722 25,747 Preferred stock dividends 3,615 3,615 3,615 3,615 Net income available to common shareholders $ 18,000 $ 4,139 $ 20,107 $ 22,132 Earnings per common share: Basic earnings per common share $ 0.58 $ 0.13 $ 0.66 $ 0.73 Diluted earnings per common share $ 0.55 $ 0.13 $ 0.62 $ 0.67

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables present the operating results for Customers' reportable business segments for the years ended December 31, 2018 , 2017 and 2016 . 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 24.56% , 37.67% and 38.00% for the years ended December 31, 2018, 2017 and 2016 , respectively. For the Year Ended December 31, 2018 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 400,948 $ 17,003 $ 417,951 Interest expense 159,674 400 160,074 Net interest income 241,274 16,603 257,877 Provision for loan losses 2,928 2,714 5,642 Non-interest income 17,499 41,499 58,998 Non-interest expense 146,946 73,233 220,179 Income (loss) before income taxes 108,899 (17,845 ) 91,054 Income tax expense (benefit) 23,742 (4,383 ) 19,359 Net income (loss) 85,157 (13,462 ) 71,695 Preferred stock dividends 14,459 — 14,459 Net income (loss) available to common shareholders $ 70,698 $ (13,462 ) $ 57,236 Goodwill and other intangibles $ 3,629 $ 12,870 $ 16,499 Total assets $ 9,688,146 $ 145,279 $ 9,833,425 Total deposits $ 6,766,378 $ 375,858 $ 7,142,236 Total non-deposit liabilities $ 1,719,225 $ 15,148 $ 1,734,373 For the Year Ended December 31, 2017 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 359,931 $ 12,919 $ 372,850 Interest expense 105,438 69 105,507 Net interest income 254,493 12,850 267,343 Provision for loan losses 5,638 1,130 6,768 Non-interest income 24,788 54,122 78,910 Non-interest expense 128,604 87,002 215,606 Income (loss) before income taxes 145,039 (21,160 ) 123,879 Income tax expense (benefit) 53,013 (7,971 ) 45,042 Net income (loss) 92,026 (13,189 ) 78,837 Preferred stock dividends 14,459 — 14,459 Net income (loss) available to common shareholders $ 77,567 $ (13,189 ) $ 64,378 Goodwill and other intangibles $ 3,630 $ 12,665 $ 16,295 Total assets $ 9,769,996 $ 69,559 $ 9,839,555 Total deposits $ 6,400,310 $ 399,832 $ 6,800,142 Total non-deposit liabilities $ 2,106,919 $ 11,530 $ 2,118,449 (1) Amounts reported include funds transfer pricing of $15.7 million and $12.9 million , respectively, for the years ended December 31, 2018 and 2017 , credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the net use of low/no-cost deposits. For the Year Ended December 31, 2016 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Interest income (1) $ 315,643 $ 6,896 $ 322,539 Interest expense 73,004 38 73,042 Net interest income 242,639 6,858 249,497 Provision for loan losses 2,246 795 3,041 Non-interest income 23,165 33,205 56,370 Non-interest expense 130,394 47,837 178,231 Income (loss) before income taxes 133,164 (8,569 ) 124,595 Income tax expense (benefit) 49,149 (3,256 ) 45,893 Net income (loss) 84,015 (5,313 ) 78,702 Preferred stock dividends 9,515 — 9,515 Net income (loss) available to common shareholders $ 74,500 $ (5,313 ) $ 69,187 Goodwill and other intangibles $ 3,639 $ 13,982 $ 17,621 Total assets $ 9,303,465 $ 79,271 $ 9,382,736 Total deposits $ 6,846,980 $ 456,795 $ 7,303,775 Total non-deposit liabilities $ 1,195,087 $ 28,002 $ 1,223,089 (1) Amounts reported include funds transfer pricing of $6.9 million for the year ended December 31, 2016, credited to BankMobile for the value provided to the Customers Bank Business Banking segment for the net use of low/no-cost deposits.

Non-Interest Revenue (Tables)

Non-Interest Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present Customers' non-interest revenues affected by ASC 606 by business segment for the years ended December 31, 2018 , 2017 , and 2016 : For the Year Ended December 31, 2018 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 794 $ 29,901 $ 30,695 Deposit fees 1,277 6,547 7,824 University fees - card and disbursement fees — 1,039 1,039 Total revenue recognized at point in time 2,071 37,487 39,558 Revenue recognized over time: University fees - subscription revenue — 3,681 3,681 Total revenue recognized over time — 3,681 3,681 Total revenue from contracts with customers $ 2,071 $ 41,168 $ 43,239 For the Year Ended December 31, 2017 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 782 $ 40,727 $ 41,509 Deposit fees 1,190 8,849 10,039 University fees - card and disbursement fees — 1,141 1,141 Total revenue recognized at point in time 1,972 50,717 52,689 Revenue recognized over time: University fees - subscription revenue — 3,272 3,272 Total revenue recognized over time — 3,272 3,272 Total revenue from contracts with customers $ 1,972 $ 53,989 $ 55,961 For the Year Ended December 31, 2016 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 620 $ 24,061 $ 24,681 Deposit fees 1,140 6,927 8,067 University fees - card and disbursement fees — 581 581 Total revenue recognized at point in time 1,760 31,569 33,329 Revenue recognized over time: University fees - subscription revenue — 1,567 1,567 Total revenue recognized over time — 1,567 1,567 Total revenue from contracts with customers $ 1,760 $ 33,136 $ 34,896
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following tables present Customers' non-interest revenues affected by ASC 606 by business segment for the years ended December 31, 2018 , 2017 , and 2016 : For the Year Ended December 31, 2018 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 794 $ 29,901 $ 30,695 Deposit fees 1,277 6,547 7,824 University fees - card and disbursement fees — 1,039 1,039 Total revenue recognized at point in time 2,071 37,487 39,558 Revenue recognized over time: University fees - subscription revenue — 3,681 3,681 Total revenue recognized over time — 3,681 3,681 Total revenue from contracts with customers $ 2,071 $ 41,168 $ 43,239 For the Year Ended December 31, 2017 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 782 $ 40,727 $ 41,509 Deposit fees 1,190 8,849 10,039 University fees - card and disbursement fees — 1,141 1,141 Total revenue recognized at point in time 1,972 50,717 52,689 Revenue recognized over time: University fees - subscription revenue — 3,272 3,272 Total revenue recognized over time — 3,272 3,272 Total revenue from contracts with customers $ 1,972 $ 53,989 $ 55,961 For the Year Ended December 31, 2016 (amounts in thousands) Customers Bank Business Banking BankMobile Consolidated Revenue from contracts with customers: Revenue recognized at point in time: Interchange and card revenue $ 620 $ 24,061 $ 24,681 Deposit fees 1,140 6,927 8,067 University fees - card and disbursement fees — 581 581 Total revenue recognized at point in time 1,760 31,569 33,329 Revenue recognized over time: University fees - subscription revenue — 1,567 1,567 Total revenue recognized over time — 1,567 1,567 Total revenue from contracts with customers $ 1,760 $ 33,136 $ 34,896

Description of the Business - N

Description of the Business - Narrative (Detail)	Dec. 31, 2018Branch
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of branches	13

Significant Accounting Polici_4

Significant Accounting Policies and Basis of Presentation - Narrative (Detail)	Jan. 01, 2018USD ($)	Jul. 11, 2016USD ($)	Dec. 31, 2016Segment	Jun. 30, 2016Segment	Dec. 31, 2018USD ($)derivativeSegmentCompensationPlanSwapswap	Dec. 31, 2017USD ($)derivativeSwap	Dec. 31, 2016USD ($)	Dec. 31, 2014	Jan. 01, 2019USD ($)
Derivative [Line Items]
Average reserve balances required to be maintained with federal reserve bank					$ 58,400,000	$ 164,700,000
Held to maturity securities					$ 0	0
Contractual payment of principal duration (days)					90 days
Contractual terms for loans (months)					6 months
Payments for termination to FDIC		$ 1,400,000
Operating lease, carrying value of assets					$ 54,500,000	21,700,000
Operating lease, accumulated depreciation					$ (4,800,000)	500,000
Operating lease, term					4 years 7 months 4 days
Maximum loan to value ratio					80.00%
Delinquency period for loan charge-offs (days)					120 days
Goodwill and other intangibles					$ 16,499,000	16,295,000
FHLB, Federal Reserve Bank, and other restricted stock					89,685,000	105,918,000
Federal Home Loan Bank stock					$ 67,300,000	83,700,000
Percentage of tax position will realized or sustained upon examination					50.00%
Number of share-based compensation plans | CompensationPlan					4
Number of reportable segments (segment) | Segment			2	1	2
Collaborative arrangement, expense reimbursement					$ 8,400,000	2,400,000	$ 0
Unrealized gains (losses) on available-for-sale securities					(20,283,000)	2,520,000	$ 2,505,000
Accounting Standards Update 2018-02
Derivative [Line Items]
Cumulative effect adjustment					0
Accounting Standards Update 2016-01
Derivative [Line Items]
Cumulative effect adjustment					$ 0
Net unrealized gain	$ 1,041,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative notional amount						$ 550,000,000
Number of interest rate swaps | derivative						9
Interest Rate Swap
Derivative [Line Items]
Number of interest rate swaps | swap					3
Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative notional amount					$ 1,030,100,000	$ 800,500,000
Number of interest rate swaps | Swap					98	76
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative notional amount					$ 750,000,000	$ 550,000,000
Number of interest rate swaps | derivative					6	9
Credit contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative notional amount					$ 94,900,000	$ 80,500,000
ESPP
Derivative [Line Items]
Purchase price under employee stock purchase plan (percent)					85.00%			85.00%
Purchase price under employee stock purchase plan, discount (percent)					15.00%			15.00%
Equity securities
Derivative [Line Items]
Unrealized gains (losses) on available-for-sale securities						$ 1,000,000
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02
Derivative [Line Items]
Cumulative effect adjustment	298,000				$ 298,000
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01
Derivative [Line Items]
Cumulative effect adjustment	1,041,000				1,041,000
Retained Earnings | Accounting Standards Update 2018-02
Derivative [Line Items]
Cumulative effect adjustment					(298,000)
Retained Earnings | Accounting Standards Update 2016-01
Derivative [Line Items]
Cumulative effect adjustment	$ 1,041,000				$ (1,041,000)
Subsequent Event | Accounting Standards Update 2016-02
Derivative [Line Items]
Operating lease, right-of-use asset									$ 25,000,000
Operating lease, liability									$ 25,000,000

Significant Accounting Polici_5

Significant Accounting Policies and Basis of Presentation - Future Lease Nonresidual Rental Payments Due From Customers For Equipment on Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Property, Plant and Equipment [Line Items]
2,019	$ 5,577
2,020	5,135
2,021	4,513
2,022	3,885
2,023	2,856
Total minimum payments	26,665
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
2,019	8,347
2,020	9,735
2,021	8,810
2,022	5,815
2,023	3,663
Thereafter	2,518
Total minimum payments	$ 38,888

Earnings Per Share - Components

Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 14,247	$ 2,414	$ 20,048	$ 20,527	$ 18,000	$ 4,139	$ 20,107	$ 22,132	$ 57,236	$ 64,378	$ 69,187
Weighted-average number of common shares outstanding – basic (shares)									31,570,118	30,659,320	27,596,020
Share-based compensation plans (shares)									658,739	1,917,451	2,221,517
Warrants (shares)									4,241	19,906	196,113
Weighted-average number of common shares – diluted (shares)									32,233,098	32,596,677	30,013,650
Basic earnings per common share (usd per share)	$ 0.45	$ 0.08	$ 0.64	$ 0.65	$ 0.58	$ 0.13	$ 0.66	$ 0.73	$ 1.81	$ 2.10	$ 2.51
Diluted earnings per share (usd per share)	$ 0.44	$ 0.07	$ 0.62	$ 0.64	$ 0.55	$ 0.13	$ 0.62	$ 0.67	$ 1.78	$ 1.97	$ 2.31

Earnings Per Share - Antidiluti

Earnings Per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (shares)	1,138,251	1,059,225	946,962
Share-based compensation plans
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (shares)	1,138,251	1,059,225	894,720
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (shares)	0	0	52,242

Changes In Accumulated Other _3

Changes In Accumulated Other Comprehensive Income (Loss) By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 920,964	$ 855,872	$ 553,902
Ending balance	956,816	920,964	855,872
Reclassification, available for sale debt securities, before tax	(18,659)	8,800	(7,237)
Unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(249)	(2,681)
Balance after reclassification adjustments		(1,458)
Other comprehensive income (loss) before reclassifications	(34,091)	7,800
Amounts reclassified from accumulated other comprehensive income (loss) to net income	13,808	(5,368)
Net current-period other comprehensive income (loss)	(20,283)	2,432
Ending balance	(21,741)	(249)	(2,681)
Foreign currency items, available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	88	0
Balance after reclassification adjustments		0
Other comprehensive income (loss) before reclassifications	0	88
Amounts reclassified from accumulated other comprehensive income (loss) to net income	0	0
Net current-period other comprehensive income (loss)	0	88
Ending balance	0	88	0
Total unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(161)	(2,681)
Balance after reclassification adjustments		(1,458)
Other comprehensive income (loss) before reclassifications	(34,091)	7,888
Amounts reclassified from accumulated other comprehensive income (loss) to net income	13,808	(5,368)
Net current-period other comprehensive income (loss)	(20,283)	2,520
Ending balance	(21,741)	(161)	(2,681)
Unrealized loss on cash flow hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(198)	(2,211)
Balance after reclassification adjustments		(240)
Other comprehensive income (loss) before reclassifications	1,477	406
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(2,159)	1,607
Net current-period other comprehensive income (loss)	(682)	2,013
Ending balance	(922)	(198)	(2,211)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(359)	(4,892)	(7,984)
Balance after reclassification adjustments		(1,698)
Other comprehensive income (loss) before reclassifications	(32,614)	8,294
Amounts reclassified from accumulated other comprehensive income (loss) to net income	11,649	(3,761)
Net current-period other comprehensive income (loss)	(20,965)	4,533
Ending balance	(22,663)	(359)	$ (4,892)
Gain on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Reclassification, available for sale debt securities, before tax	18,700	8,800
Reclassification, available for sale debt securities, after tax	13,800	5,400
Interest expense
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Reclassification, cash flow hedge, before tax	95
Reclassification, cash flow hedge, after tax	70
Non-interest income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Reclassification, cash flow hedge, before tax	2,800	2,600
Reclassification, cash flow hedge, after tax	2,100	$ 1,600
Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment	0
Accounting Standards Update 2018-02 | Unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				$ (256)
Accounting Standards Update 2018-02 | Foreign currency items, available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				0
Accounting Standards Update 2018-02 | Total unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				(256)
Accounting Standards Update 2018-02 | Unrealized loss on cash flow hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				(42)
Accounting Standards Update 2018-02 | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment	(298)			(298)
Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment	0
Accounting Standards Update 2016-01 | Unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				(953)
Accounting Standards Update 2016-01 | Foreign currency items, available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				(88)
Accounting Standards Update 2016-01 | Total unrealized gains (losses), available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				(1,041)
Accounting Standards Update 2016-01 | Unrealized loss on cash flow hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				0
Accounting Standards Update 2016-01 | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment	$ (1,041)			(1,041)
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment				$ (1,300)

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 692,674
Gross Unrealized Gains	920
Gross Unrealized Losses	(30,300)
Available-for-sale securities, debt securities	663,294
Investment securities available for sale, fair value	665,012	$ 471,371
Amortized Cost		472,300
Gross Unrealized Gains		2,639
Gross Unrealized Losses		3,568
Equity Investment securities, at fair value	1,718
Investment securities, at fair value		471,371
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	311,267
Gross Unrealized Gains	0
Gross Unrealized Losses	(5,893)
Available-for-sale securities, debt securities	305,374
Amortized Cost		186,221
Gross Unrealized Gains		36
Gross Unrealized Losses		2,799
Investment securities, at fair value		183,458
Agency-guaranteed commercial real estate mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		238,809
Gross Unrealized Gains		432
Gross Unrealized Losses		769
Investment securities, at fair value		238,472
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	381,407
Gross Unrealized Gains	920
Gross Unrealized Losses	(24,407)
Available-for-sale securities, debt securities	$ 357,920
Amortized Cost		44,959
Gross Unrealized Gains		1,130
Gross Unrealized Losses		0
Investment securities, at fair value		46,089
Equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,311
Gross Unrealized Gains		1,041
Gross Unrealized Losses		0
Investment securities, at fair value		$ 3,352

Investment Securities - Stateme

Investment Securities - Statement of Proceeds from Sale of Available for Sale Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale securities		$ 476,182	$ 769,203	$ 2,852
Gross gains		0	8,808	26
Gross losses		(18,659)	(8)	(1)
Net (losses) gains	$ (18,659)	$ (18,659)	$ 8,800	$ 25

Investment Securities - Summa_2

Investment Securities - Summary of Investment Securities by Stated Maturity (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 0
Amortized cost, due after one year through five years	0
Amortized cost, due after five years through ten years	329,096
Amortized cost, due after ten years	52,311
Amortized Cost	692,674
Fair value, due in one year or less	0
Fair value, due after one year through five years	0
Fair value, due after five years through ten years	308,578
Fair value, due after ten years	49,342
Total debt securities, fair value	663,294
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities, amortized cost	311,267
Amortized Cost	311,267
Mortgage-backed securities, fair value	305,374
Total debt securities, fair value	$ 305,374

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 615,410	$ 220,831
Less Than 12 Months, Unrealized Losses	(30,300)	(1,396)
12 Months or More, Fair Value	0	72,730
12 Months or More, Unrealized Losses	0	(2,172)
Fair Value, Total	615,410	293,561
Unrealized Losses	(30,300)	(3,568)
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	305,374	104,861
Less Than 12 Months, Unrealized Losses	(5,893)	(656)
12 Months or More, Fair Value	0	66,579
12 Months or More, Unrealized Losses	0	(2,143)
Fair Value, Total	305,374	171,440
Unrealized Losses	(5,893)	(2,799)
Agency-guaranteed commercial real estate mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value		115,970
Less Than 12 Months, Unrealized Losses		(740)
12 Months or More, Fair Value		6,151
12 Months or More, Unrealized Losses		(29)
Fair Value, Total		122,121
Unrealized Losses		$ (769)
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	310,036
Less Than 12 Months, Unrealized Losses	(24,407)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	310,036
Unrealized Losses	$ (24,407)

Investment Securities - Narrati

Investment Securities - Narrative (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Security	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of available-for-sale investment securities in the less than twelve month category (security) | Security	26
Number of available-for-sale investment securities in the twelve month or more category (security) | Security	0
Available-for-sale Securities		$ 471,371
Unrealized gains (losses) on available-for-sale securities	$ (20,283)	2,520	$ 2,505
Deferred tax liabilities, equity investments		0
Equity investment securities, at fair value	1,718
Pledged investment securities fair value	23,000	16,900
Equity securities
Debt Securities, Available-for-sale [Line Items]
Impairment loss		(12,900)
Available-for-sale Securities		3,352
Unrealized gains (losses) on available-for-sale securities		$ 1,000
Accounting Standards Update 2016-01
Debt Securities, Available-for-sale [Line Items]
Cumulative effect adjustment	0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)
Debt Securities, Available-for-sale [Line Items]
Cumulative effect adjustment				$ 1,000
Other Non-interest Income | Equity securities
Debt Securities, Available-for-sale [Line Items]
Unrealized loss	$ 1,600

Loans Held for Sale - Compositi

Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables Held-for-sale [Abstract]
Multi-family loans, at lower of cost or fair value			$ 0	$ 144,191
Total commercial loans held for sale			0	144,191
Residential mortgage loans, at fair value			1,507	1,886
Loans held for sale			1,507	146,077
Transfer of loans from held for sale to held for investment	$ 129,700		129,691	0	$ 25,118
Transfer of loans from held for investment to held for sale		$ 150,600	$ 0	$ 150,638	$ 0

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Loan Losses - Schedule of Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, mortgage warehouse, at fair value	$ 1,405,420	$ 1,793,408
Loans receivable	7,138,498	6,768,175
Deferred (fees) costs and unamortized (discounts) premiums, net	(424)	83
Allowance for loan losses	(39,972)	(38,015)	$ (37,315)	$ (35,647)
Total loans receivable, net of allowance for loan losses	8,503,522	8,523,651
Mortgage Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, mortgage warehouse, at fair value	1,405,420	1,793,408
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,285,297	3,502,381
Allowance for loan losses	(11,462)	(12,168)	(11,602)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	56,491	85,393
Allowance for loan losses	(624)	(979)	(840)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	566,561	234,090
Allowance for loan losses	(3,654)	(2,929)	(3,342)
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	79,731	90,227
Allowance for loan losses	(145)	(180)	(286)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	74,035	3,547
Allowance for loan losses	(2,529)	(172)	$ (118)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,418,171	6,440,311
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,285,297	3,502,381
Commercial | Commercial and industrial (including owner occupied commercial real estate)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,951,277	1,633,818
Commercial | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,125,106	1,218,719
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	56,491	85,393
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	720,327	327,864
Consumer | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	566,561	234,090
Consumer | Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	79,731	90,227
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 74,035	$ 3,547

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Loan Losses - Narrative (Detail)	Dec. 31, 2018USD ($)CommitmentLoan	Jul. 11, 2016USD ($)	Mar. 31, 2014Allowance	Dec. 31, 2018USD ($)AllowanceCommitmentLoan	Dec. 31, 2017USD ($)AllowanceCommitmentLoan	Dec. 31, 2016USD ($)AllowanceCommitmentLoan
Financing Receivable, Modifications [Line Items]
Loans held for sale, average life from purchase to sale (days)				23 days
Loans receivable, net of allowance for loan losses, carrying value	$ 8,503,522,000			$ 8,503,522,000	$ 8,523,651,000
Available funds for reimbursement	500,000			500,000	600,000
Individually evaluated for impairment	39,118,000			39,118,000	38,435,000
Troubled debt restructurings loans	$ 19,200,000			$ 19,200,000	$ 20,400,000	$ 16,400,000
Minimum performance requirement (months)				6 months
Sustained performance period (months)				6 months
Commitments to lend additional funds to debtors | Commitment	0			0	0	0
Number of Loans | Loan				41	40	64
TDR modification (allowance) | Allowance			0	0	1	0
Allowance for TDR modification					$ 1,000
Threshold period to pay potential liability related to FDIC loss sharing agreements				45 days
Payments for termination to FDIC		$ 1,400,000
Loans held-for-investment, purchase price as a percentage of loans outstanding				99.90%	99.40%
Payments to acquire loans receivable				$ 398,468,000	$ 264,090,000	$ 0
Gain (loss) on sales of loans				3,294,000	4,223,000	$ 3,685,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	$ 17,828,000			17,828,000	17,461,000
Other
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	111,000			$ 111,000	$ 30,000
Number of Loans | Loan				1	0	0
Manufactured housing
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	10,195,000			$ 10,195,000	$ 10,089,000
Number of Loans | Loan				38	36	58
Number of TDR loans that defaulted on payments | Loan					5	8
Amount of TDR loans that defaulted on payments					$ 200,000	$ 200,000
Commercial real estate non-owner occupied
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	129,000			$ 129,000	$ 160,000
Number of Loans | Loan				0	0	1
Number of TDR loans that defaulted on payments | Loan						1
Amount of TDR loans that defaulted on payments						$ 1,800,000
Residential real estate
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	8,631,000			$ 8,631,000	$ 9,247,000
Number of Loans | Loan				2	0	4
Number of TDR loans that defaulted on payments | Loan						1
Amount of TDR loans that defaulted on payments						$ 100,000
Multi-family
Financing Receivable, Modifications [Line Items]
Individually evaluated for impairment	1,155,000			$ 1,155,000	$ 0
Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Sustained performance period (months)				9 months
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Other real estate owned	200,000			$ 200,000	300,000
Foreclosure loans	$ 2,100,000			$ 2,100,000	1,600,000
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of TDR loans that defaulted on payments | Loan				1
Amount of TDR loans that defaulted on payments				$ 1,500,000	2,100,000
Manufactured Housing
Financing Receivable, Modifications [Line Items]
Number of TDR loans that defaulted on payments | Loan	4
Amount of TDR loans that defaulted on payments	$ 100,000
Federal Home Loan Bank of Pittsburgh
Financing Receivable, Modifications [Line Items]
Loans pledged as collateral	$ 5,400,000,000			$ 5,400,000,000	$ 5,500,000,000
Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan				0	0	0

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Loan Losses - Loans by Type and Performance Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 15,551	$ 19,813
Non-Accrual	27,494	26,415
Current	7,073,879	6,695,032
Total loans	7,138,498	6,768,175
Loans receivable, at amortized cost or lower of cost or market	$ 7,138,498	6,768,175
Due days for loan payments (days)	30 days
Delinquent period (days)	90 days
30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 13,363	17,070
90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,188	2,743
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,574	26,915
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	4,900
Non-Accrual	1,155	0
Current	3,282,452	3,495,600
Total loans	3,285,297	3,502,381
Loans receivable, at amortized cost or lower of cost or market	3,285,297	3,502,381
Multi-family | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	4,900
Multi-family | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Multi-family | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,690	1,881
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,914	103
Non-Accrual	17,764	17,392
Current	1,353,586	1,130,831
Total loans	1,373,800	1,149,090
Loans receivable, at amortized cost or lower of cost or market	1,373,800	1,149,090
Commercial and industrial | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,914	103
Commercial and industrial | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial and industrial | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	536	764
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	193	202
Non-Accrual	1,037	1,453
Current	567,809	472,501
Total loans	577,477	484,728
Loans receivable, at amortized cost or lower of cost or market	577,477	484,728
Commercial real estate owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	193	202
Commercial real estate owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial real estate owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,438	10,572
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,190	93
Non-Accrual	129	160
Current	1,119,443	1,213,216
Total loans	1,125,106	1,218,719
Loans receivable, at amortized cost or lower of cost or market	1,125,106	1,218,719
Commercial real estate non-owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,190	93
Commercial real estate non-owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial real estate non-owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,344	5,250
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Non-Accrual	0	0
Current	56,491	85,393
Total loans	56,491	85,393
Loans receivable, at amortized cost or lower of cost or market	56,491	85,393
Construction | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Construction | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Construction | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	5,940	7,628
Non-Accrual	5,605	5,420
Current	550,679	215,361
Total loans	566,561	234,090
Loans receivable, at amortized cost or lower of cost or market	566,561	234,090
Residential real estate | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	5,940	7,628
Residential real estate | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Residential real estate | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,337	5,681
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	6,114	6,771
Non-Accrual	1,693	1,959
Current	69,916	78,946
Total loans	79,731	90,227
Loans receivable, at amortized cost or lower of cost or market	79,731	90,227
Manufactured housing | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	3,926	4,028
Manufactured housing | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,188	2,743
Manufactured housing | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,008	2,551
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	200	116
Non-Accrual	111	31
Current	73,503	3,184
Total loans	74,035	3,547
Loans receivable, at amortized cost or lower of cost or market	74,035	3,547
Other | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	200	116
Other | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Other | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 221	$ 216

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 38,015	$ 37,315	$ 35,647
Charge-offs	(4,757)	(7,127)	(4,405)
Recoveries	1,072	1,059	2,743
Provision for loan losses	5,642	6,768	3,330
Ending Balance	39,972	38,015	37,315
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				$ 39,118	$ 38,435
Collectively evaluated for impairment				7,077,806	6,702,825
Loans receivable, at amortized cost or lower of cost or market				7,138,498	6,768,175
Allowance for loan losses, individually evaluated for impairment				845	1,451
Allowance for loan losses, collectively evaluated for impairment				36,249	32,537
Total allowance for loan losses	38,015	37,315	35,647	39,972	38,015
Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				21,574	26,915
Allowance for loan losses, loans acquired with credit deterioration				2,878	4,027
Multi-family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	12,168	11,602
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	(706)	566
Ending Balance	11,462	12,168	11,602
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				1,155	0
Collectively evaluated for impairment				3,282,452	3,500,500
Loans receivable, at amortized cost or lower of cost or market				3,285,297	3,502,381
Allowance for loan losses, individually evaluated for impairment				539	0
Allowance for loan losses, collectively evaluated for impairment				10,923	12,168
Total allowance for loan losses	12,168	11,602	11,602	11,462	12,168
Multi-family | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				1,690	1,881
Allowance for loan losses, loans acquired with credit deterioration				0	0
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	10,918	11,050
Charge-offs	(1,722)	(4,157)
Recoveries	403	676
Provision for loan losses	2,546	3,349
Ending Balance	12,145	10,918	11,050
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				17,828	17,461
Collectively evaluated for impairment				1,355,436	1,130,865
Loans receivable, at amortized cost or lower of cost or market				1,373,800	1,149,090
Allowance for loan losses, individually evaluated for impairment				261	650
Allowance for loan losses, collectively evaluated for impairment				11,516	9,804
Total allowance for loan losses	10,918	11,050	11,050	12,145	10,918
Commercial and industrial | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				536	764
Allowance for loan losses, loans acquired with credit deterioration				368	464
Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	3,232	2,183
Charge-offs	(747)	(731)
Recoveries	326	9
Provision for loan losses	509	1,771
Ending Balance	3,320	3,232	2,183
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				1,069	1,448
Collectively evaluated for impairment				567,970	472,708
Loans receivable, at amortized cost or lower of cost or market				577,477	484,728
Allowance for loan losses, individually evaluated for impairment				1	642
Allowance for loan losses, collectively evaluated for impairment				3,319	2,580
Total allowance for loan losses	3,232	2,183	2,183	3,320	3,232
Commercial real estate owner occupied | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				8,438	10,572
Allowance for loan losses, loans acquired with credit deterioration				0	10
Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	7,437	7,894
Charge-offs	0	(486)
Recoveries	5	0
Provision for loan losses	(1,349)	29
Ending Balance	6,093	7,437	7,894
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				129	160
Collectively evaluated for impairment				1,120,633	1,213,309
Loans receivable, at amortized cost or lower of cost or market				1,125,106	1,218,719
Allowance for loan losses, individually evaluated for impairment				0	0
Allowance for loan losses, collectively evaluated for impairment				4,161	4,630
Total allowance for loan losses	7,437	7,894	7,894	6,093	7,437
Commercial real estate non-owner occupied | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				4,344	5,250
Allowance for loan losses, loans acquired with credit deterioration				1,932	2,807
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	979	840
Charge-offs	0	0
Recoveries	241	164
Provision for loan losses	(596)	(25)
Ending Balance	624	979	840
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				56,491	85,393
Loans receivable, at amortized cost or lower of cost or market				56,491	85,393
Allowance for loan losses, individually evaluated for impairment				0	0
Allowance for loan losses, collectively evaluated for impairment				624	979
Total allowance for loan losses	979	840	840	624	979
Construction | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				0	0
Allowance for loan losses, loans acquired with credit deterioration				0	0
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,929	3,342
Charge-offs	(466)	(415)
Recoveries	76	72
Provision for loan losses	1,115	(70)
Ending Balance	3,654	2,929	3,342
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				8,631	9,247
Collectively evaluated for impairment				553,593	219,162
Loans receivable, at amortized cost or lower of cost or market				566,561	234,090
Allowance for loan losses, individually evaluated for impairment				41	155
Allowance for loan losses, collectively evaluated for impairment				3,227	2,177
Total allowance for loan losses	2,929	3,342	3,342	3,654	2,929
Residential real estate | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				4,337	5,681
Allowance for loan losses, loans acquired with credit deterioration				386	597
Manufactured housing
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	180	286
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	(35)	(106)
Ending Balance	145	180	286
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				10,195	10,089
Collectively evaluated for impairment				67,528	77,587
Loans receivable, at amortized cost or lower of cost or market				79,731	90,227
Allowance for loan losses, individually evaluated for impairment				3	4
Allowance for loan losses, collectively evaluated for impairment				89	82
Total allowance for loan losses	180	286	286	145	180
Manufactured housing | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				2,008	2,551
Allowance for loan losses, loans acquired with credit deterioration				53	94
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	172	118
Charge-offs	(1,822)	(1,338)
Recoveries	21	138
Provision for loan losses	4,158	1,254
Ending Balance	2,529	172	118
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment				111	30
Collectively evaluated for impairment				73,703	3,301
Loans receivable, at amortized cost or lower of cost or market				74,035	3,547
Allowance for loan losses, individually evaluated for impairment				0	0
Allowance for loan losses, collectively evaluated for impairment				2,390	117
Total allowance for loan losses	$ 172	$ 118	$ 118	2,529	172
Other | Purchased credit impaired loans
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans acquired with credit deterioration				221	216
Allowance for loan losses, loans acquired with credit deterioration				$ 139	$ 55

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, total	$ 39,118	$ 38,435
Unpaid principle balance, total	42,031	39,089
Related allowance	845	1,451
Average recorded investment, total	36,980	36,177	$ 51,428
Interest income recognized, total	1,671	1,293	2,459
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	0	0
Recorded investment net of charge offs, with an allowance recorded	1,155	0
Unpaid principal balance, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	1,155	0
Related allowance	539	0
Average recorded investment, with no related allowance recorded	537	0	964
Average recorded investment, with an allowance recorded	231	0	232
Interest income recognized, with no related allowance recorded	8	0	53
Interest income recognized, with an allowance recorded	37	0	0
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	13,660	9,138
Recorded investment net of charge offs, with an allowance recorded	4,168	8,323
Unpaid principal balance, with no related allowance recorded	15,263	9,287
Unpaid principal balance, with an allowance recorded	4,351	8,506
Related allowance	261	650
Average recorded investment, with no related allowance recorded	8,831	8,865	15,424
Average recorded investment, with an allowance recorded	6,504	5,984	7,028
Interest income recognized, with no related allowance recorded	673	214	804
Interest income recognized, with an allowance recorded	25	230	436
Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	1,037	806
Recorded investment net of charge offs, with an allowance recorded	32	642
Unpaid principal balance, with no related allowance recorded	1,766	806
Unpaid principal balance, with an allowance recorded	32	642
Related allowance	1	642
Average recorded investment, with no related allowance recorded	776	1,439	7,963
Average recorded investment, with an allowance recorded	443	882	173
Interest income recognized, with no related allowance recorded	19	70	426
Interest income recognized, with an allowance recorded	3	0	0
Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	129	160
Recorded investment net of charge offs, with an allowance recorded		0
Unpaid principal balance, with no related allowance recorded	241	272
Unpaid principal balance, with an allowance recorded		0
Related allowance		0
Average recorded investment, with no related allowance recorded	645	898	5,265
Average recorded investment, with an allowance recorded		0	380
Interest income recognized, with no related allowance recorded	48	2	155
Interest income recognized, with an allowance recorded		0	0
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	4,842	3,628
Recorded investment net of charge offs, with an allowance recorded	3,789	5,619
Unpaid principal balance, with no related allowance recorded	5,128	3,801
Unpaid principal balance, with an allowance recorded	3,789	5,656
Related allowance	41	155
Average recorded investment, with no related allowance recorded	4,129	4,617	4,567
Average recorded investment, with an allowance recorded	4,566	3,307	395
Interest income recognized, with no related allowance recorded	151	24	120
Interest income recognized, with an allowance recorded	131	187	0
Manufactured housing
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	10,027	9,865
Recorded investment net of charge offs, with an allowance recorded	168	224
Unpaid principal balance, with no related allowance recorded	10,027	9,865
Unpaid principal balance, with an allowance recorded	168	224
Related allowance	3	4
Average recorded investment, with no related allowance recorded	10,015	10,003	8,961
Average recorded investment, with an allowance recorded	214	131	0
Interest income recognized, with no related allowance recorded	561	558	465
Interest income recognized, with an allowance recorded	14	8	0
Other
Financing Receivable, Impaired [Line Items]
Recorded investment net of charge offs, with no related allowance recorded	111	30
Recorded investment net of charge offs, with an allowance recorded		0
Unpaid principal balance, with no related allowance recorded	111	30
Unpaid principal balance, with an allowance recorded		0
Related allowance		0
Average recorded investment, with no related allowance recorded	89	51	47
Average recorded investment, with an allowance recorded		0	29
Interest income recognized, with no related allowance recorded	$ 1	0	0
Interest income recognized, with an allowance recorded		$ 0	$ 0

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Loan Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	41	40	64
Recorded Investment | $	$ 1,675	$ 8,071	$ 6,616
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	5	3
Recorded Investment | $	$ 60	$ 6,497	$ 1,995
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	39	35	61
Recorded Investment | $	$ 1,615	$ 1,574	$ 4,621

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Loan Losses - Schedule of Accruing and Nonaccrual TDRs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 1,675	$ 8,071	$ 6,616
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	6,437	76
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	352	0	2,410
Manufactured housing
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,310	1,634	2,286
Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	13	0	0
Accruing
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,624	12	12
Accruing | Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Impaired [Line Items]
Recorded Investment	64	0	0
Accruing | Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	32	0	0
Accruing | Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0	0
Accruing | Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,026	4	4
Accruing | Manufactured housing
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,502	8	7
Accruing | Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0	0
Nonaccruing
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,572	8	5
Nonaccruing | Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,273	6	0
Nonaccruing | Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0	0
Nonaccruing | Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0	2
Nonaccruing | Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	667	1	1
Nonaccruing | Manufactured housing
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,620	2	2
Nonaccruing | Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	12	0	0
Total
Financing Receivable, Impaired [Line Items]
Recorded Investment	19,196	20	16
Total | Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,337	6	0
Total | Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	32	0	0
Total | Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0	2
Total | Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,693	5	5
Total | Manufactured housing
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,122	10	10
Total | Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 12	$ 0	$ 0

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Loan Losses - Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	41	40	64
Recorded Investment | $	$ 1,675	$ 8,071	$ 6,616
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	4	1
Recorded Investment | $	$ 0	$ 6,437	$ 76
Commercial real estate non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 1,844
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	0	4
Recorded Investment | $	$ 352	$ 0	$ 2,410
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	38	36	58
Recorded Investment | $	$ 1,310	$ 1,634	$ 2,286
Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	0	0
Recorded Investment | $	$ 13	$ 0	$ 0

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Loan Losses - Changes in Accretable Discount Related to Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield balance, beginning of period	$ 7,825	$ 10,202	$ 12,947
Accretion to interest income	(1,455)	(1,673)	(3,760)
Reclassification from nonaccretable difference and disposals, net	(192)	(704)	1,015
Accretable yield balance, end of period	$ 6,178	$ 7,825	$ 10,202

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Loan Losses - Schedule of Changes in Allowance for Loans Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 38,015	$ 37,315	$ 35,647
Provision for loan losses	5,642	6,768	3,330
Charge-offs	(4,757)	(7,127)	(4,405)
Recoveries	1,072	1,059	2,743
Ending Balance	$ 39,972	$ 38,015	$ 37,315

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward]
Beginning Balance	$ 0	$ 0	$ (2,083)
Increased (decreased) estimated cash flows	0	0	289
Other activity, net	0	0	(255)
Cash receipts from FDIC	0	0	2,049
Ending Balance	0	0	0
Provision for loan losses	5,642	6,768	3,330
Effect attributable to FDIC loss sharing arrangements	0	0	(289)
Net amount reported as provision for loan losses	$ 5,642	$ 6,768	$ 3,041

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Loan Losses - Credit Quality Tables for Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 7,138,498	$ 6,768,175
Loans receivable, at amortized cost or lower of cost or market	7,138,498	6,768,175
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,181,911	6,300,595
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	126,180	99,279
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	110,080	40,437
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	700,664	305,939
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,663	21,925
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,285,297	3,502,381
Loans receivable, at amortized cost or lower of cost or market	3,285,297	3,502,381
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,201,822	3,438,554
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	55,696	53,873
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	27,779	9,954
Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Multi-family | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,373,800	1,149,090
Loans receivable, at amortized cost or lower of cost or market	1,373,800	1,149,090
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,306,466	1,118,889
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	30,551	7,652
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	36,783	22,549
Commercial and industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial and industrial | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	577,477	484,728
Loans receivable, at amortized cost or lower of cost or market	577,477	484,728
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	562,639	471,826
Commercial real estate owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,730	5,987
Commercial real estate owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,108	6,915
Commercial real estate owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate owner occupied | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,125,106	1,218,719
Loans receivable, at amortized cost or lower of cost or market	1,125,106	1,218,719
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,054,493	1,185,933
Commercial real estate non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	30,203	31,767
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,410	1,019
Commercial real estate non-owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate non-owner occupied | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	56,491	85,393
Loans receivable, at amortized cost or lower of cost or market	56,491	85,393
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	56,491	85,393
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	566,561	234,090
Loans receivable, at amortized cost or lower of cost or market	566,561	234,090
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	555,016	221,042
Residential real estate | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,545	13,048
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	79,731	90,227
Loans receivable, at amortized cost or lower of cost or market	79,731	90,227
Manufactured housing | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	71,924	81,497
Manufactured housing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,807	8,730
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	74,035	3,547
Loans receivable, at amortized cost or lower of cost or market	74,035	3,547
Other | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73,724	3,400
Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 311	$ 147

Loans Receivable and Allowan_15

Loans Receivable and Allowance for Loan Losses - Schedule of Loan Purchases and Sales (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments to acquire loans receivable	$ 398,468,000	$ 264,090,000	$ 0
Proceeds from sale of loans receivable	$ (107,119,000)	$ (458,192,000)	(39,073,000)
Loans held-for-investment, purchase price as a percentage of loans outstanding	99.90%	99.40%
Gain (loss) on sales of loans	$ 3,294,000	$ 4,223,000	3,685,000
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans receivable	(54,638,000)	(226,831,000)	0
Commercial and industrial (including owner occupied commercial real estate)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans receivable	(32,263,000)	(19,974,000)	(23,731,000)
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans receivable	(20,218,000)	(19,813,000)	(15,342,000)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments to acquire loans receivable	368,402,000	264,090,000	0
Proceeds from sale of loans receivable	0	(191,574,000)	0
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments to acquire loans receivable	30,066,000	0	0
Proceeds from sale of loans receivable	$ 0	$ 0	$ 0

Bank Premises and Equipment - C

Bank Premises and Equipment - Components of Bank Premises and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 30,290	$ 28,983
Accumulated depreciation and amortization	(19,227)	(17,028)
Total	11,063	11,955
Leasehold improvements
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 14,080	14,028
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	25 years
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 7,110	6,447
Furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	5 years
Furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	10 years
IT equipment
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 8,645	8,002
IT equipment | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	3 years
IT equipment | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	5 years
Automobiles
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 455	$ 506
Automobiles | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	3 years
Automobiles | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life (years)	5 years

Bank Premises and Equipment - N

Bank Premises and Equipment - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation, occupancy and amortization of leasehold improvement	$ 2.7	$ 2.8	$ 2.5
Rent expense	$ 5.8	$ 5.2	$ 4.7

Bank Premises and Equipment - F

Bank Premises and Equipment - Future Minimum Rental Commitments Under Non-Cancelable Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2,019	$ 5,577
2,020	5,135
2,021	4,513
2,022	3,885
2,023	2,856
Thereafter	4,699
Total minimum payments	$ 26,665

Deposits - Components of Deposi

Deposits - Components of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits, by Component, Alternative [Abstract]
Demand, non-interest bearing	$ 1,122,171	$ 1,052,115
Demand, interest bearing	803,948	523,848
Savings, including money market deposit accounts	3,481,936	3,318,486
Time, $100,000 and over	792,370	1,284,855
Time, other	941,811	620,838
Total deposits	$ 7,142,236	$ 6,800,142

Deposits - Schedule of Time Dep

Deposits - Schedule of Time Deposit Maturities (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Time Deposits, Rolling Year Maturity [Abstract]
2,019	$ 1,459,919
2,020	172,903
2,021	81,148
2,022	17,147
2,023	3,064
Total time deposits	$ 1,734,181

Deposits - Narrative (Detail)

Deposits - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Time deposits greater than $250,000	$ 500	$ 800
Brokered money market deposits	556.5	654.8
Brokered certificates of deposit	800.2	504.3
Demand deposit overdrafts reclassified as loans	$ 3.4	$ 2

Borrowings - Short Term Borrowi

Borrowings - Short Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
FHLB advances	$ 1,248,070	$ 1,611,860
Federal funds purchased	187,000	155,000
Total short-term debt	$ 1,435,070	$ 1,766,860
FHLB advances, rate	2.62%	1.47%
Federal funds purchased, rate	2.60%	1.50%

Borrowings - Summary of Bancorp

Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
FHLB Advances
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 2,622,165	$ 2,283,250	$ 1,697,800
Average balance during the year	$ 1,526,180	$ 1,415,755	$ 965,293
Weighted-average interest rate during the year	2.05%	1.44%	0.95%
Federal Funds Purchased
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 195,000	$ 238,000	$ 137,000
Average balance during the year	$ 156,652	$ 163,466	$ 84,514
Weighted-average interest rate during the year	1.92%	1.19%	0.58%

Borrowings - Narrative (Detail)

Borrowings - Narrative (Detail) - USD ($)	Jun. 26, 2014	Jun. 30, 2017	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total borrowing capacity with the Federal Home Loan Bank			$ 4,100,000,000		$ 4,300,000,000
Total borrowing capacity with the Federal Reserve Bank of Philadelphia			102,500,000		142,500,000
Qualifying Loans
Debt Instrument [Line Items]
Qualifying loans			5,200,000,000		5,500,000,000
Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes, interest rate		3.95%
Issue of subordinated term note	$ 25,000,000	$ 100,000,000
Face amount, percentage		99.775%
Interest rate, effective percentage		4.00%
Proceeds from issuance of debt		$ 98,600,000
Subordinated debt, average interest rate for the year	4.625%
Senior Notes | Senior Notes Due 2018
Debt Instrument [Line Items]
Senior unsecured notes, interest rate				6.375%
Senior unsecured notes aggregate amount				$ 63,300,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Issue of subordinated term note	$ 110,000,000
Subordinated debt, average interest rate for the year	6.125%
Subordinated debt, basis spread on variable rate	3.443%
Redemption price, percent of principal balance	100.00%
Federal Funds Purchased
Debt Instrument [Line Items]
Aggregate availability under federal funds line			$ 522,000,000		$ 310,000,000

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Millions	Dec. 17, 2018$ / shares	Sep. 17, 2018$ / shares	Jun. 15, 2018$ / shares	Mar. 15, 2018$ / shares	Dec. 15, 2017$ / shares	Sep. 15, 2017$ / shares	Jun. 15, 2017$ / shares	Mar. 15, 2017$ / shares	Dec. 15, 2016$ / shares	Nov. 09, 2016USD ($)$ / sharesshares	Sep. 16, 2016USD ($)$ / sharesshares	Sep. 15, 2016$ / shares	Aug. 11, 2016USD ($)shares	Jun. 15, 2016$ / shares	Apr. 28, 2016USD ($)$ / sharesshares	Mar. 15, 2016$ / shares	Jan. 29, 2016USD ($)$ / sharesshares	May 18, 2015USD ($)$ / sharesshares	Dec. 31, 2018series$ / sharesshares	Dec. 31, 2017$ / sharesshares	Dec. 31, 2016shares	Nov. 30, 2013
Capital Unit [Line Items]
Percent of outstanding shares authorized for repurchase																						5.00%
Premium percent over current book value																						20.00%
Repurchase of shares (shares) | shares																			719,200	0	0
Weighted-average exercise price, outstanding (usd per share)																			$ 18.04
Warrants outstanding to purchase common stock (shares) | shares																			0	35,187
Number of preferred stock series outstanding | series																			4
Preferred stock, par value (usd per share)																			$ 1	$ 1
Minimum
Capital Unit [Line Items]
Purchase price of common stock (usd per share)																			$ 21.38
Series F Preferred Stock
Capital Unit [Line Items]
Preferred stock, dividends paid (usd per share)	$ 0.375	$ 0.375	$ 0.375		$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.370833
Series E Preferred Stock
Capital Unit [Line Items]
Preferred stock, dividends paid (usd per share)	0.403125	0.403125	0.403125	$ 0.403125	0.403125	0.403125	0.403125	0.403125	0.403125			$ 0.403125		$ 0.210521
Series D Preferred Stock
Capital Unit [Line Items]
Preferred stock, dividends paid (usd per share)	0.40625	0.40625	0.40625	0.40625	0.40625	0.40625	0.40625	0.40625	0.40625			0.40625		0.40625		$ 0.2076
Series C Preferred Stock
Capital Unit [Line Items]
Preferred stock, redemption price (usd per share)																		$ 25
Preferred stock, dividends paid (usd per share)	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375			$ 0.4375		$ 0.4375		$ 0.4375
Public Stock Offering
Capital Unit [Line Items]
Number of shares issued in transaction | shares										2,415,000
Sale of stock, price per share (usd per share)										$ 25
Consideration received on transaction | $										$ 58.3
Public Stock Offering | Series F Preferred Stock
Capital Unit [Line Items]
Number of shares issued in transaction | shares											3,400,000
Sale of stock, price per share (usd per share)											$ 25
Consideration received on transaction | $											$ 82.2
Preferred stock, par value (usd per share)											$ 1
Preferred stock, fixed dividend rate											6.00%
Public Stock Offering | Series F Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Preferred stock, floating dividend rate											4.762%
Public Stock Offering | Series E Preferred Stock
Capital Unit [Line Items]
Number of shares issued in transaction | shares															2,300,000
Sale of stock, price per share (usd per share)															$ 25
Consideration received on transaction | $															$ 55.6
Preferred stock, par value (usd per share)															$ 1
Preferred stock, fixed dividend rate															6.45%
Public Stock Offering | Series E Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Preferred stock, floating dividend rate															5.14%
Public Stock Offering | Series D Preferred Stock
Capital Unit [Line Items]
Number of shares issued in transaction | shares																	1,000,000
Sale of stock, price per share (usd per share)																	$ 25
Consideration received on transaction | $																	$ 24.1
Preferred stock, par value (usd per share)																	$ 1
Preferred stock, fixed dividend rate																	6.50%
Public Stock Offering | Series D Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Preferred stock, floating dividend rate																	5.09%
Public Stock Offering | Series C Preferred Stock
Capital Unit [Line Items]
Number of shares issued in transaction | shares																		2,300,000
Sale of stock, price per share (usd per share)																		$ 25
Consideration received on transaction | $																		$ 55.6
Preferred stock, par value (usd per share)																		$ 1
Preferred stock, fixed dividend rate																		7.00%
Public Stock Offering | Series C Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Preferred stock, floating dividend rate																		5.30%
At Market Issuance Sales Agreement
Capital Unit [Line Items]
Number of shares issued in transaction | shares													219,386
Consideration received on transaction | $													$ 5.5
Maximum aggregate offering price | $													$ 50

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)SERP_retirement_age	Dec. 31, 2018USD ($)year	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Retirement Benefits [Abstract]
Employers matching contribution			50.00%
Employees first contribution			6.00%
401(k) profit sharing plan, employers matching contribution amount		$ 2,100,000				$ 1,900,000	$ 1,600,000
SERP annual retirement benefits period (years)	15 years
SERP retirement age				65	65
SERP target annual retirement benefit	$ 300,000	300,000	$ 300,000	$ 300,000	$ 300,000
SERP annual rate of return			7.00%
SERP present value of the amount owed	$ 4,300,000	$ 4,300,000	$ 4,300,000	$ 4,300,000	$ 4,300,000	$ 4,600,000

Share-Based Compensation Plan_2

Share-Based Compensation Plans - Narrative (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)yearshares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum exercisable period for stock options (years)	10 years
Participant vested in an annual deferral accounts	100.00%
Involuntary termination age (year) | year	65
Employee stock purchase plan expense | $	$ 8,600	$ 6,100	$ 6,200
Nonvested awards, compensation cost not yet recognized | $	20,400
Cash received from exercise of options | $	$ 2,800
Restricted stock units, granted as long term incentive compensation (percent)	40.00%
Restricted stock units, vesting upon meeting certain thresholds (percent)	60.00%
Director | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Voting common stock issued (shares)	37,377
Voting common stock issued | $	$ 1,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable stock options (shares)	849,303
Award vesting period (years)	3 years
Number of shares granted (shares)	10,000
Options expiration date (years)	10 years
Tax benefit from exercise of options | $	$ 700
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Number of units vested (shares)	97,414
Number of restricted stock units granted (shares)	433,614
Restricted stock units vesting percentage per year	33.33%
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	5 years
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully diluted tangible book value	50.00%
Maximum number of shares that may be issued under 2010 plan (shares)	3,666,667
2004 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares that may be issued under 2014 plan (shares)	2,750,000
Aggregate number of shares of common stock available for grant (shares)	1,311,743
2004 Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted (shares)	416,241
BRRP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (shares)	254,976
BRRP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted (shares)	17,373
BRRP | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Receipt deferral percentage under BRRP plan	25.00%
BRRP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Receipt deferral percentage under BRRP plan	50.00%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan expense | $	$ 141	$ 132	$ 103
Purchase price under employee stock purchase plan (percent)	85.00%			85.00%
Purchase price under employee stock purchase plan, discount (percent)	15.00%			15.00%
Cliff | 2004 Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted (shares)	31,257
Cliff | BRRP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	5 years
Waterfall | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years

Share-Based Compensation Plan_3

Share-Based Compensation Plans - Statement of Weighted-Average Assumptions Used and Resulting Weighted-Average Fair Value of Option (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted-average risk-free interest rate	2.87%	2.35%	1.84%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted-average expected volatility	25.47%	25.05%	23.39%
Weighted-average expected life (in years)	7 years	7 years	7 years
Weighted-average fair value of each option granted (usd per share)	$ 10.05	$ 8.68	$ 7.61

Share-Based Compensation Plan_4

Share-Based Compensation Plans - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding (usd per share), ending balance	$ 18.04
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, outstanding, beginning balance | shares	2,718,694
Number of shares, granted | shares	10,000
Number of shares, exercised | shares	(197,918)
Number of shares, forfeited | shares	(10,250)
Number of shares, outstanding, ending balance | shares	2,520,526
Exercisable at December 31, 2018 | shares	849,303
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding (usd per share), beginning balance	$ 21.52
Weighted-average exercise price, issued (usd per share)	29.48
Weighted-average exercise price, exercised (usd per share)	14.06
Weighted-average exercise price, forfeited (usd per share)	21.96
Weighted-average exercise price, outstanding (usd per share), ending balance	22.13
Weighted-average exercise price, exercisable (usd per share)	$ 16.29
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term in years, outstanding (years)	6 years 4 months 24 days
Weighted-average remaining contractual term in years, exercisable (years)	3 years 8 months 5 days
Aggregate intrinsic value, exercised | $	$ 3,123
Aggregate intrinsic value, outstanding | $	2,311
Aggregate intrinsic value, exercisable | $	$ 2,276

Share-Based Compensation Plan_5

Share-Based Compensation Plans - Summary of Non-Vested Options (Detail)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Non-Vested Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, outstanding, beginning balance | shares	2,621,731
Number of shares, granted | shares	10,000
Number of shares, forfeited | shares	(10,250)
Number of shares, outstanding, ending balance | shares	1,671,223
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average exercise price, outstanding (usd per share), beginning balance | $ / shares	$ 21.85
Weighted-average exercise price, granted (usd per share) | $ / shares	29.48
Weighted-average exercise price, forfeited (usd per share) | $ / shares	21.96
Weighted-average exercise price, outstanding (usd per share), ending balance | $ / shares	$ 25.10
Vested Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, vested | shares	(950,258)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average exercise price, vested (usd per share) | $ / shares	$ 16.22

Share-Based Compensation Plan_6

Share-Based Compensation Plans - Status of Restricted Stock (Detail) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock Units, outstanding and unvested, beginning balance | shares	590,036
Restricted Stock Units, granted | shares	433,614
Restricted Stock Units, vested | shares	(97,414)
Restricted Stock Units, forfeited | shares	(41,577)
Restricted Stock Units, outstanding and unvested, ending balance | shares	884,659
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant-date fair value, outstanding and unvested (usd per share), beginning balance | $ / shares	$ 24.74
Weighted-average grant-date fair value, granted (usd per share) | $ / shares	23.63
Weighted-average grant-date fair value, vested (usd per share) | $ / shares	25.66
Weighted-average grant-date fair value, forfeited (usd per share) | $ / shares	27.05
Weighted-average grant-date fair value, outstanding and unvested (usd per share), ending balance | $ / shares	$ 23.99

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current									$ 10,056	$ 29,924	$ 48,472
Deferred									9,303	15,118	(2,579)
Income tax expense	$ 5,109	$ 28	$ 6,820	$ 7,402	$ 10,806	$ 14,899	$ 12,327	$ 7,009	$ 19,359	$ 45,042	$ 45,893

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Detail) - USD ($)	Jan. 01, 2018	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Federal income tax at statutory rate	21.00%		35.00%	21.00%	35.00%	35.00%
Percentage of tax position will realized or sustained upon examination				50.00%
Valuation allowance on deferred tax assets				$ 0	$ 0
Unrecognized tax benefits				0	$ 0
Deferred tax asset, provisional income tax expense		$ 5,500,000
Annual deduction for compensation paid, maximum				$ 1,000,000
Minimum
Income Taxes [Line Items]
Percentage of tax position will realized or sustained upon examination				50.00%
Federal
Income Taxes [Line Items]
Net operating loss carryovers				$ 5,200,000

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income (Loss) Before Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 21, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax at statutory rate, amount											$ 19,121	$ 43,357	$ 43,608
State income tax, amount											4,067	3,835	4,548
Tax-exempt interest, net of disallowance amount											(360)	(381)	(237)
Bank-owned life insurance, amount											(1,547)	(2,675)	(1,716)
Equity-based compensation, amount											(547)	(10,741)	(3,659)
Unrecorded basis difference in foreign subsidiaries, amount											343	4,527	2,830
Enactment of federal tax reform, amount											(21)	5,505	0
Other, amount											(1,927)	961	519
Income tax expense			$ 5,109	$ 28	$ 6,820	$ 7,402	$ 10,806	$ 14,899	$ 12,327	$ 7,009	$ 19,359	$ 45,042	$ 45,893
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax at statutory rate, percentage of pretax income	21.00%	35.00%									21.00%	35.00%	35.00%
State income tax, percentage of pretax income											4.47%	3.10%	3.65%
Tax-exempt interest, net of disallowance percentage of pretax income											(0.40%)	(0.31%)	(0.19%)
Bank-owned life insurance, percentage of pretax income											(1.70%)	(2.16%)	(1.38%)
Equity-based compensation, percentage of pretax income											(0.60%)	(8.67%)	(2.94%)
Unrecorded basis difference in foreign subsidiaries, percentage of pretax income											0.38%	3.65%	2.27%
Enactment of federal tax reform, percentage of pretax income											(0.02%)	4.44%	0.00%
Other, percentage of pretax income											(2.12%)	0.78%	0.42%
Effective income tax rate, percentage of pretax income											21.26%	36.36%	36.83%
Executive Officer
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Equity-based compensation, amount											$ 230	$ 654	$ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Equity-based compensation, percentage of pretax income											0.25%	0.53%	0.00%

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Allowance for loan losses	$ 10,449	$ 9,738
Net unrealized losses on securities	7,639	512
OREO write-downs	91	748
Non-accrual interest	539	515
Net operating losses	1,212	1,199
Deferred compensation	1,129	1,181
Equity-based compensation	4,049	2,748
Cash flow hedge	324	84
Incentive compensation	1,056	634
Net deferred loan fees	671	47
Other	3,028	2,215
Total deferred tax assets	30,187	19,621
Deferred tax liabilities
Fair value adjustments on acquisitions	(569)	(618)
Bank premises and equipment	(884)	(986)
Lease adjustments	(17,786)	(4,899)
Other	(746)	(980)
Total deferred tax liabilities	(19,985)	(7,483)
Net deferred tax asset	$ 10,202	$ 12,138

Transactions with Executive O_3

Transactions with Executive Officers, Directors, and Principal Shareholders - Schedule of Activity Relating to Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance as of December 31,	$ 0	$ 238	$ 220
Additions	27	99	1,160
Repayments	(22)	(337)	(1,142)
Balance as of December 31,	$ 5	$ 0	$ 238

Transactions with Executive O_4

Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Percentage of gross revenue	5.00%
Percentage of aggregate amount of consolidated assets	5.00%
Director
Related Party Transaction [Line Items]
Related party deposits	$ 15.3	$ 10.6
Minimum
Related Party Transaction [Line Items]
Percentage of participation in equity	10.00%
Letter of Credit | Affiliated Entity
Related Party Transaction [Line Items]
Outstanding commitment	$ 0.5	0.5
Unfunded Loan Commitment | Affiliated Entity
Related Party Transaction [Line Items]
Commitment to provide short-term commercial real estate financing		$ 8

Financial Instruments with Of_3

Financial Instruments with Off-Balance-Sheet Risk - Schedule of Financial Instruments Outstanding Contract Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments to fund loans	$ 345,608	$ 333,874
Unfunded commitments to fund mortgage warehouse loans	1,537,900	1,567,139
Unfunded commitments under lines of credit and credit cards	867,131	485,345
Letters of credit	55,659	39,890
Other unused commitments	$ 4,822	$ 6,679

Regulatory Matters - Summary of

Regulatory Matters - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2016
Customers Bancorp, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 (to risk-weighted-assets), actual amount	$ 745,795		$ 689,494
Tier 1 capital (to risk-weighted assets), actual amount	963,266		906,963
Total capital (to risk-weighted assets), actual amount	1,081,962		1,021,601
Tier 1 capital (to average assets), actual amount	$ 963,266		$ 906,963
Common equity Tier 1 (to risk-weighted assets), actual ratio	8.964%		8.805%
Tier 1 capital (to risk-weighted assets), actual ratio	11.578%		11.583%
Total capital (to risk-weighted assets), actual ratio	13.005%		13.047%
Tier 1 capital (to average assets), actual ratio	9.665%		8.937%
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount	$ 374,388		$ 352,368
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount	499,185		469,824
Total capital (to risk-weighted assets), for capital adequacy purposes amount	665,580		626,432
Tier 1 capital (to average assets), for capital adequacy purposes amount	$ 398,668		$ 405,949
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio	4.50%	6.375%	4.50%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio	6.00%	7.875%	6.00%
Total capital (to risk-weighted assets), for capital adequacy purposes ratio	8.00%	9.875%	8.00%
Tier 1 capital (to average assets), for capital adequacy purposes ratio	4.00%		4.00%
Common equity Tier 1 (to risk-weighted assets), for Basel III amount	$ 530,384		$ 450,248
Tier 1 (to risk-weighted assets), for Basel III amount	655,180		567,704
Total capital (to risk-weighted assets), for Basel III amount	821,575		724,313
Tier 1 capital (to average assets) for Basel III amount	$ 398,668		$ 405,949
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio	6.375%		5.75%
Tier 1 capital (to risk-weighted assets), for Basel III ratio	7.875%		7.25%
Total capital (to risk-weighted assets), for Basel III ratio	9.875%		9.25%
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 (to risk-weighted-assets), actual amount	$ 1,066,121		$ 1,023,564
Tier 1 capital (to risk-weighted assets), actual amount	1,066,121		1,023,564
Total capital (to risk-weighted assets), actual amount	1,215,522		1,170,666
Tier 1 capital (to average assets), actual amount	$ 1,066,121		$ 1,023,564
Common equity Tier 1 (to risk-weighted assets), actual ratio	12.822%		13.081%
Tier 1 capital (to risk-weighted assets), actual ratio	12.822%		13.081%
Total capital (to risk-weighted assets), actual ratio	14.619%		14.961%
Tier 1 capital (to average assets), actual ratio	10.699%		10.092%
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount	$ 374,160		$ 352,122
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount	498,879		469,496
Total capital (to risk-weighted assets), for capital adequacy purposes amount	665,173		625,994
Tier 1 capital (to average assets), for capital adequacy purposes amount	$ 398,570		$ 405,701
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio	4.50%		4.50%	5.125%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio	6.00%		6.00%	6.625%
Total capital (to risk-weighted assets), for capital adequacy purposes ratio	8.00%		8.00%	8.625%
Tier 1 capital (to average assets), for capital adequacy purposes ratio	4.00%		4.00%
Common equity Tier 1 (to risk-weighted assets), to be well capitalized under prompt correction action provisions amount	$ 540,453		$ 508,621
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount	665,173		625,994
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount	831,466		782,493
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount	$ 498,212		$ 507,126
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	8.00%		8.00%
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio	10.00%		10.00%
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions ratio	5.00%		5.00%
Common equity Tier 1 (to risk-weighted assets), for Basel III amount	$ 530,059		$ 449,934
Tier 1 (to risk-weighted assets), for Basel III amount	654,779		567,307
Total capital (to risk-weighted assets), for Basel III amount	821,072		723,806
Tier 1 capital (to average assets) for Basel III amount	$ 398,570		$ 405,701
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio	6.375%		5.75%
Tier 1 capital (to risk-weighted assets), for Basel III ratio	7.875%		7.25%
Total capital (to risk-weighted assets), for Basel III ratio	9.875%		9.25%
Tier 1 capital (to average assets), for Basel III ratio	4.00%		4.00%

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details)	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer, excess of minimum capital ratio				2.50%
Maximum buffer, percent of risk weighted assets for 2016	0.625%
Maximum buffer, percent of risk weighted assets for 2017	1.25%
Maximum buffer, percent of risk weighted assets for 2018	1.875%
Maximum buffer, percent of risk weighted assets for 2019	2.50%
Customers Bancorp, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio	4.50%	6.375%	4.50%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio	6.00%	7.875%	6.00%
Total capital (to risk-weighted assets), for capital adequacy purposes ratio	8.00%	9.875%	8.00%

Disclosures about Fair Value _3

Disclosures about Fair Value of Financial Instruments - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2017	Jun. 26, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, average life from purchase to sale (days)	23 days
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured notes aggregate amount		$ 100,000,000	$ 25,000,000

Disclosures about Fair Value _4

Disclosures about Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, carrying value	$ 62,135	$ 146,323	$ 264,709	$ 264,593
Cash and cash equivalents, fair value	62,135	146,323
Investment securities available for sale, fair value	665,012	471,371
Debt securities available for sale, at fair value	663,294
Debt securities, available for sale, fair value	663,294	471,371
Equity securities, carrying amount	1,718
Equity securities, at fair value	1,718
Loans held for sale, carrying value	1,507	146,077
Loans held for sale, fair value	1,507	146,251
Loans receivable, net of allowance for loan losses, carrying value	8,503,522	8,523,651
Loans receivable, net of allowance for loan losses, fair value	8,481,128	8,470,171
FHLB, Federal Reserve Bank and other restricted stock, carrying value	89,685	105,918
FHLB, Federal Reserve Bank and other restricted stock, fair value	89,685	105,918
Derivative assets, carrying value	14,693	9,752
Derivative assets, fair value	14,693	9,752
Deposits, carrying value	7,142,236	6,800,142
Deposits, fair value	7,136,009	6,796,095
Federal funds purchased, carrying value	187,000	155,000
Federal funds purchased, fair value	187,000	155,000
FHLB advances, carrying value	1,248,070	1,611,860
FHLB advances, fair value	1,248,046	1,611,603
Other borrowings, carrying value	123,871	186,497
Other borrowings, fair value	121,718	193,557
Subordinated debt, carrying value	108,977	108,880
Subordinated debt, fair value	110,550	115,775
Derivative liabilities, carrying value	16,286	10,074
Derivative liabilities, fair value	16,286	10,074
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	62,135	146,323
Debt securities, available for sale, fair value	0	3,352
Equity securities, at fair value	1,718
Loans held for sale, fair value	0	0
Loans receivable, net of allowance for loan losses, fair value	0	0
FHLB, Federal Reserve Bank and other restricted stock, fair value	0	0
Derivative assets, carrying value	0	0
Derivative assets, fair value	0	0
Deposits, fair value	5,408,055	4,894,449
Federal funds purchased, fair value	187,000	155,000
FHLB advances, fair value	998,070	881,860
Other borrowings, fair value	0	65,072
Subordinated debt, fair value	0	0
Derivative liabilities, carrying value	0	0
Derivative liabilities, fair value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	0	0
Debt securities, available for sale, fair value	663,294	468,019
Equity securities, at fair value	0
Loans held for sale, fair value	1,507	1,886
Loans receivable, net of allowance for loan losses, fair value	1,405,420	1,793,408
FHLB, Federal Reserve Bank and other restricted stock, fair value	89,685	105,918
Derivative assets, carrying value	14,624	9,692
Derivative assets, fair value	14,624	9,692
Deposits, fair value	1,727,954	1,901,646
Federal funds purchased, fair value	0	0
FHLB advances, fair value	249,976	729,743
Other borrowings, fair value	121,718	128,485
Subordinated debt, fair value	110,550	115,775
Derivative liabilities, carrying value	16,286	10,074
Derivative liabilities, fair value	16,286	10,074
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	0	0
Debt securities, available for sale, fair value	0	0
Equity securities, at fair value	0
Loans held for sale, fair value	0	144,365
Loans receivable, net of allowance for loan losses, fair value	7,075,708	6,676,763
FHLB, Federal Reserve Bank and other restricted stock, fair value	0	0
Derivative assets, carrying value	69	60
Derivative assets, fair value	69	60
Deposits, fair value	0	0
Federal funds purchased, fair value	0	0
FHLB advances, fair value	0	0
Other borrowings, fair value	0	0
Subordinated debt, fair value	0	0
Derivative liabilities, carrying value	0	0
Derivative liabilities, fair value	$ 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 Non-recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Measured at Fair Value on a Nonrecurring Basis:
Impaired loans reserve	$ 845	$ 1,451
Impaired loans, net of reserves
Measured at Fair Value on a Nonrecurring Basis:
Impaired loans reserve	845	1,451
Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,086,632	2,276,417
Fair Value, Measurements, Recurring | Derivatives
Assets
Assets, Fair Value Disclosure	14,693	9,752
Measured at Fair Value on a Nonrecurring Basis:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	16,286	10,074
Fair Value, Measurements, Recurring | Loans held for sale – fair value option
Assets
Assets, Fair Value Disclosure	1,507	1,886
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, Fair Value Disclosure	1,405,420	1,793,408
Fair Value, Measurements, Recurring | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, Fair Value Disclosure	305,374	183,458
Fair Value, Measurements, Recurring | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Assets
Assets, Fair Value Disclosure		238,472
Fair Value, Measurements, Recurring | Available-for-sale Securities | Corporate notes
Assets
Assets, Fair Value Disclosure	357,920	46,089
Fair Value, Measurements, Recurring | Available-for-sale Securities | Equity securities
Assets
Assets, Fair Value Disclosure	1,718	3,352
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets, Fair Value Disclosure	1,718	3,352
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives
Assets
Assets, Fair Value Disclosure	0	0
Measured at Fair Value on a Nonrecurring Basis:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Assets
Assets, Fair Value Disclosure		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities
Assets
Assets, Fair Value Disclosure	1,718	3,352
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Assets, Fair Value Disclosure	2,084,845	2,273,005
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives
Assets
Assets, Fair Value Disclosure	14,624	9,692
Measured at Fair Value on a Nonrecurring Basis:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	16,286	10,074
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets, Fair Value Disclosure	1,507	1,886
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, Fair Value Disclosure	1,405,420	1,793,408
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, Fair Value Disclosure	305,374	183,458
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Assets
Assets, Fair Value Disclosure		238,472
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes
Assets
Assets, Fair Value Disclosure	357,920	46,089
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Assets, Fair Value Disclosure	69	60
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives
Assets
Assets, Fair Value Disclosure	69	60
Measured at Fair Value on a Nonrecurring Basis:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Assets
Assets, Fair Value Disclosure		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	11,497	15,351
Fair Value, Measurements, Nonrecurring | Impaired loans, net of reserves
Assets
Assets, Fair Value Disclosure	10,876	13,902
Fair Value, Measurements, Nonrecurring | Other real estate owned
Assets
Assets, Fair Value Disclosure	621	1,449
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Assets
Assets, Fair Value Disclosure	11,497	15,351
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves
Assets
Assets, Fair Value Disclosure	10,876	13,902
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned
Assets
Assets, Fair Value Disclosure	$ 621	$ 1,449

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31,	$ 60	$ 45
Issuances	407	360
Settlements	(398)	(345)
Balance at December 31,	$ 69	$ 60

Disclosures about Fair Value _7

Disclosures about Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 816	$ 1,726
Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans - real estate		13,902
Other real estate owned		1,449
Residential mortgage loan commitments	69	$ 60
Fair Value Estimate | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans - real estate	10,260
Other real estate owned	621
Fair Value Estimate | Business Asset Valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans - real estate	$ 616
Impaired loans, net of reserves | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Impaired loans, net of reserves | Business Asset Valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	26.00%	26.00%
Other real estate owned | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Mortgages | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	90.00%	90.00%
Minimum | Impaired loans, net of reserves | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Minimum | Impaired loans, net of reserves | Business Asset Valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Minimum | Other real estate owned | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Minimum | Mortgages | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	90.00%	90.00%
Maximum | Impaired loans, net of reserves | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Maximum | Impaired loans, net of reserves | Business Asset Valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	50.00%	50.00%
Maximum | Other real estate owned | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average	8.00%	8.00%
Maximum | Mortgages | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	90.00%	90.00%

Derivative Instruments And He_3

Derivative Instruments And Hedging Activities - Narrative (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)derivativeSwapswap	Dec. 31, 2017USD ($)derivativeSwap
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from AOCI to interest expense	$ 200,000
Period for hedging exposure to the variability in future cash flows for forecasted transactions	30 months
Assets needed for immediate settlement of derivatives in a net liability position	$ 2,600,000
Minimum collateral with counterparties	700,000
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 500,000,000
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | swap	3
Not Designated as Hedging Instrument | Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	30 days
Not Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	60 days
Not Designated as Hedging Instrument | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | Swap	98	76
Derivative notional amount	$ 1,030,100,000	$ 800,500,000
Not Designated as Hedging Instrument | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	3,600,000	2,700,000
Not Designated as Hedging Instrument | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 94,900,000	$ 80,500,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | derivative		9
Derivative notional amount		$ 550,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | derivative	6	9
Derivative notional amount	$ 750,000,000	$ 550,000,000
Other Non-interest Income | Not Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain on cash flow hedge ineffectiveness	$ 4,800,000

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	$ 7,529	$ 5,930
Fair value, derivative liabilities	9,077	5,058
Designated as Hedging Instrument | Other assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	256	816
Designated as Hedging Instrument | Other assets | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	256	816
Designated as Hedging Instrument | Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	1,502	1,140
Designated as Hedging Instrument | Other liabilities | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	1,502	1,140
Not Designated as Hedging Instrument | Other assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	14,437	8,936
Not Designated as Hedging Instrument | Other assets | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	14,300	8,776
Not Designated as Hedging Instrument | Other assets | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	68	100
Not Designated as Hedging Instrument | Other assets | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	69	60
Not Designated as Hedging Instrument | Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	14,784	8,934
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	14,730	8,897
Not Designated as Hedging Instrument | Other liabilities | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	54	37
Not Designated as Hedging Instrument | Other liabilities | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	$ 0	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) arising during the period	$ 1,995	$ 666	$ (1,093)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (loss) recognized in earnings	3,545	790	3,118
Not Designated as Hedging Instrument | Other non-interest income | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (loss) recognized in earnings	3,409	604	2,955
Not Designated as Hedging Instrument | Other non-interest income | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (loss) recognized in earnings	127	171	163
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	9	15	0
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) arising during the period	1,477	406	(629)
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion)	2,917
Designated as Hedging Instrument | Other non-interest income | Interest Rate Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from accumulated OCI into income (ineffective portion)	2,822
Designated as Hedging Instrument | Interest expense | Interest Rate Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion)	$ 95	$ (2,634)	$ (1,946)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 14,693	$ 9,752
Interest rate swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets	7,529	5,930
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	7,529	5,930
Financial Instruments	0	0
Cash Collateral Received	1,860	5,070
Net Amount	$ 5,669	$ 860

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 16,286	$ 10,074
Interest rate swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Liabilities	9,077	5,058
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	9,077	5,058
Financial Instruments	0	0
Cash Collateral Pledged	702	4,872
Net Amount	$ 8,375	$ 186

Condensed Financial Statement_3

Condensed Financial Statements of Parent Company - Summary of Condensed Balance Sheets of Parent Company (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash in subsidiary bank	$ 62,135	$ 146,323	$ 264,709	$ 264,593
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other borrowings	123,871	186,497
Total liabilities	8,876,609	8,918,591
Shareholders' equity	956,816	920,964	855,872	553,902
Total liabilities and shareholders’ equity	9,833,425	9,839,555
Customers Bancorp
ASSETS
Cash in subsidiary bank	16,684	67,231	$ 54,441	$ 54,567
Investments in and receivables due from subsidiaries	1,061,389	1,039,883
Other assets	3,417	3,160
Total assets	1,081,490	1,110,274
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other borrowings	123,871	186,497
Other liabilities	803	2,813
Total liabilities	124,674	189,310
Shareholders' equity	956,816	920,964
Total liabilities and shareholders’ equity	$ 1,081,490	$ 1,110,274

Condensed Financial Statement_4

Condensed Financial Statements of Parent Company - Summary of Condensed Income Statements of Parent Company (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating expense:
Interest	$ 41,779	$ 46,044	$ 40,317	$ 31,933	$ 29,319	$ 30,266	$ 25,246	$ 20,676	$ 160,074	$ 105,507	$ 73,042
Income tax benefit	(5,109)	(28)	(6,820)	(7,402)	(10,806)	(14,899)	(12,327)	(7,009)	(19,359)	(45,042)	(45,893)
Net income	17,862	6,029	23,663	24,142	21,615	7,754	23,722	25,747	71,695	78,837	78,702
Preferred stock dividends	3,615	3,615	3,615	3,615	3,615	3,615	3,615	3,615	14,459	14,459	9,515
Net income available to common shareholders	$ 14,247	$ 2,414	$ 20,048	$ 20,527	$ 18,000	$ 4,139	$ 20,107	$ 22,132	57,236	64,378	69,187
Comprehensive income									50,730	83,370	81,794
Customers Bancorp
Operating income:
Other, including dividends from Bank									45,422	38,200	25,400
Total operating income									45,422	38,200	25,400
Operating expense:
Interest									8,178	7,984	5,854
Other									1,722	1,742	4,570
Total operating expense									9,900	9,726	10,424
Income before taxes and undistributed income of subsidiaries									35,522	28,474	14,976
Income tax benefit									2,335	3,620	3,961
Income before undistributed income of subsidiaries									37,857	32,094	18,937
Equity in undistributed income of subsidiaries									33,838	46,743	59,765
Net income									71,695	78,837	78,702
Preferred stock dividends									14,459	14,459	9,515
Net income available to common shareholders									$ 57,236	$ 64,378	$ 69,187

Condensed Financial Statement_5

Condensed Financial Statements of Parent Company - Summary of Condensed Statements of Cash Flows of Parent Company (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 17,862	$ 6,029	$ 23,663	$ 24,142	$ 21,615	$ 7,754	$ 23,722	$ 25,747	$ 71,695	$ 78,837	$ 78,702
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on sale of investment securities		$ 18,659							18,659	(8,800)	(25)
(Increase) decrease in other assets									(34,614)	(32,256)	(11,538)
(Decrease) increase in other liabilities									9,881	(16,687)	5,819
Net Cash Provided by Operating Activities									97,474	62,193	91,403
Cash Flows from Investing Activities:
Proceeds from sales of investment securities available for sale									476,182	769,203	2,852
Net Cash Used in Investing Activities									(104,098)	(565,125)	(961,534)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock									3,585	2,716	70,985
Net proceeds from issuance of preferred stock									0	0	161,902
(Repayments of) proceeds from issuance of long-term debt									0	98,564	0
Exercise and redemption of warrants									112	1,059	1,532
Purchase of treasury stock									(12,976)	0	0
Preferred stock dividends paid									(14,459)	(14,459)	(9,051)
Net Cash (Used in) Provided by Financing Activities									(77,564)	384,546	870,247
Net (Decrease) Increase in Cash and Cash Equivalents									(84,188)	(118,386)	116
Cash and Cash Equivalents – Beginning				146,323				264,709	146,323	264,709	264,593
Cash and Cash Equivalents – Ending	62,135				146,323				62,135	146,323	264,709
Customers Bancorp
Cash Flows from Operating Activities:
Net income									71,695	78,837	78,702
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries, net of dividends received from Bank									(33,838)	(46,743)	(59,765)
Loss (gain) on sale of investment securities									0	0	1
(Increase) decrease in other assets									(256)	7,624	(7,721)
(Decrease) increase in other liabilities									(251)	(1,322)	54
Net Cash Provided by Operating Activities									37,350	38,396	11,271
Cash Flows from Investing Activities:
Proceeds from sales of investment securities available for sale									0	0	4
Payments for investments in and advances to subsidiaries									(29)	(98,725)	(230,872)
Net Cash Used in Investing Activities									(29)	(98,725)	(230,868)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock									3,585	2,716	70,985
Net proceeds from issuance of preferred stock									0	0	161,902
(Repayments of) proceeds from issuance of long-term debt									(63,250)	98,564	0
Exercise and redemption of warrants									112	1,059	1,532
Purchase of treasury stock									(12,976)	0	0
Payments of employee taxes withheld from share-based awards									(880)	(14,761)	(5,897)
Preferred stock dividends paid									(14,459)	(14,459)	(9,051)
Net Cash (Used in) Provided by Financing Activities									(87,868)	73,119	219,471
Net (Decrease) Increase in Cash and Cash Equivalents									(50,547)	12,790	(126)
Cash and Cash Equivalents – Beginning				$ 67,231				$ 54,441	67,231	54,441	54,567
Cash and Cash Equivalents – Ending	$ 16,684				$ 67,231				$ 16,684	$ 67,231	$ 54,441

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 103,303	$ 110,045	$ 107,639	$ 96,964	$ 97,619	$ 98,285	$ 93,852	$ 83,094	$ 417,951	$ 372,850	$ 322,539
Interest expense	41,779	46,044	40,317	31,933	29,319	30,266	25,246	20,676	160,074	105,507	73,042
Net interest income	61,524	64,001	67,322	65,031	68,300	68,019	68,606	62,418	257,877	267,343	249,497
Provision for loan losses	1,385	2,924	(784)	2,117	831	2,352	535	3,050	5,642	6,768	3,041
Non-interest income (1)	19,877	2,084	16,127	20,910	19,740	18,026	18,391	22,754	58,998	78,910	56,370
Non-interest expenses	57,045	57,104	53,750	52,280	54,788	61,040	50,413	49,366	220,179	215,606	178,231
Income before income taxes	22,971	6,057	30,483	31,544	32,421	22,653	36,049	32,756
Provision for income taxes	5,109	28	6,820	7,402	10,806	14,899	12,327	7,009	19,359	45,042	45,893
Net income	17,862	6,029	23,663	24,142	21,615	7,754	23,722	25,747	71,695	78,837	78,702
Preferred stock dividends	3,615	3,615	3,615	3,615	3,615	3,615	3,615	3,615	14,459	14,459	9,515
Net income available to common shareholders	$ 14,247	$ 2,414	$ 20,048	$ 20,527	$ 18,000	$ 4,139	$ 20,107	$ 22,132	$ 57,236	$ 64,378	$ 69,187
Earnings per common share:
Basic earnings per share (usd per share)	$ 0.45	$ 0.08	$ 0.64	$ 0.65	$ 0.58	$ 0.13	$ 0.66	$ 0.73	$ 1.81	$ 2.10	$ 2.51
Diluted earnings per share (usd per share)	$ 0.44	$ 0.07	$ 0.62	$ 0.64	$ 0.55	$ 0.13	$ 0.62	$ 0.67	$ 1.78	$ 1.97	$ 2.31
Loss on sale of investment securities		$ (18,659)							$ (18,659)	$ 8,800	$ 25

Business Segments (Details)

Business Segments (Details) $ in Thousands	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)Segment	Jun. 30, 2016Segment	Dec. 31, 2018USD ($)Segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (segment) | Segment									2	1	2
Effective income tax rate											21.26%	36.36%	36.83%
Interest income	$ 103,303	$ 110,045	$ 107,639	$ 96,964	$ 97,619	$ 98,285	$ 93,852	$ 83,094			$ 417,951	$ 372,850	$ 322,539
Interest	41,779	46,044	40,317	31,933	29,319	30,266	25,246	20,676			160,074	105,507	73,042
Net interest income	61,524	64,001	67,322	65,031	68,300	68,019	68,606	62,418			257,877	267,343	249,497
Provision for loan losses	1,385	2,924	(784)	2,117	831	2,352	535	3,050			5,642	6,768	3,041
Non-interest income (1)	19,877	2,084	16,127	20,910	19,740	18,026	18,391	22,754			58,998	78,910	56,370
Non-interest expenses	57,045	57,104	53,750	52,280	54,788	61,040	50,413	49,366			220,179	215,606	178,231
Income before income taxes	22,971	6,057	30,483	31,544	32,421	22,653	36,049	32,756
Income tax expense	5,109	28	6,820	7,402	10,806	14,899	12,327	7,009			19,359	45,042	45,893
Net income	17,862	6,029	23,663	24,142	21,615	7,754	23,722	25,747			71,695	78,837	78,702
Preferred stock dividends	3,615	3,615	3,615	3,615	3,615	3,615	3,615	3,615			14,459	14,459	9,515
Net income available to common shareholders	14,247	$ 2,414	$ 20,048	$ 20,527	18,000	$ 4,139	$ 20,107	$ 22,132			57,236	64,378	69,187
Goodwill and other intangibles	16,499				16,295						16,499	16,295
Total assets	9,833,425				9,839,555						9,833,425	9,839,555
Total deposits	7,142,236				6,800,142						7,142,236	6,800,142
Consolidated
Segment Reporting Information [Line Items]
Interest income											417,951	372,850	322,539
Interest											160,074	105,507	73,042
Net interest income											257,877	267,343	249,497
Provision for loan losses											5,642	6,768	3,041
Non-interest income (1)											58,998	78,910	56,370
Non-interest expenses											220,179	215,606	178,231
Income before income taxes											91,054	123,879	124,595
Income tax expense											19,359	45,042	45,893
Net income											71,695	78,837	78,702
Preferred stock dividends											14,459	14,459	9,515
Net income available to common shareholders											57,236	64,378	69,187
Goodwill and other intangibles	16,499				16,295				$ 17,621		16,499	16,295	17,621
Total assets	9,833,425				9,839,555				9,382,736		9,833,425	9,839,555	9,382,736
Total deposits	7,142,236				6,800,142				7,303,775		7,142,236	6,800,142	7,303,775
Total non-deposit liabilities	1,734,373				2,118,449				1,223,089		$ 1,734,373	$ 2,118,449	$ 1,223,089
Operating Segments | Customers Bank Business Banking
Segment Reporting Information [Line Items]
Effective income tax rate											24.56%	37.67%	38.00%
Interest income											$ 400,948	$ 359,931	$ 315,643
Interest											159,674	105,438	73,004
Net interest income											241,274	254,493	242,639
Provision for loan losses											2,928	5,638	2,246
Non-interest income (1)											17,499	24,788	23,165
Non-interest expenses											146,946	128,604	130,394
Income before income taxes											108,899	145,039	133,164
Income tax expense											23,742	53,013	49,149
Net income											85,157	92,026	84,015
Preferred stock dividends											14,459	14,459	9,515
Net income available to common shareholders											70,698	77,567	74,500
Goodwill and other intangibles	3,629				3,630				3,639		3,629	3,630	3,639
Total assets	9,688,146				9,769,996				9,303,465		9,688,146	9,769,996	9,303,465
Total deposits	6,766,378				6,400,310				6,846,980		6,766,378	6,400,310	6,846,980
Total non-deposit liabilities	1,719,225				2,106,919				1,195,087		1,719,225	2,106,919	1,195,087
Operating Segments | BankMobile
Segment Reporting Information [Line Items]
Interest income											17,003	12,919	6,896
Interest											400	69	38
Net interest income											16,603	12,850	6,858
Provision for loan losses											2,714	1,130	795
Non-interest income (1)											41,499	54,122	33,205
Non-interest expenses											73,233	87,002	47,837
Income before income taxes											(17,845)	(21,160)	(8,569)
Income tax expense											(4,383)	(7,971)	(3,256)
Net income											(13,462)	(13,189)	(5,313)
Preferred stock dividends											0	0	0
Net income available to common shareholders											(13,462)	(13,189)	(5,313)
Goodwill and other intangibles	12,870				12,665				13,982		12,870	12,665	13,982
Total assets	145,279				69,559				79,271		145,279	69,559	79,271
Total deposits	375,858				399,832				456,795		375,858	399,832	456,795
Total non-deposit liabilities	$ 15,148				$ 11,530				$ 28,002		15,148	11,530	28,002
Segment Reconciling Items
Segment Reporting Information [Line Items]
Interest income											$ 15,700	$ 12,900	$ 6,900

Non-Interest Revenue - Narrativ

Non-Interest Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, liability	$ 2.2	$ 2
Contract with customer, asset	1.4	1.1
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 5.5	$ 5.9	$ 1.3
Minimum | BankMobile
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, timing of satisfaction of performance obligation and payment	P3Y
Maximum | BankMobile
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, timing of satisfaction of performance obligation and payment	P5Y

Non-Interest Revenue - Non-Inte

Non-Interest Revenue - Non-Interest Revenue by Business (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 30,695	$ 41,509	$ 24,681
Deposit fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,824	10,039	8,067
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,500	5,900	1,300
Total revenue from contracts with customers	43,239	55,961	34,896
Accounting Standards Update 2014-09 | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
University fees - card and disbursement fees	1,039	1,141	581
Total revenue from contracts with customers	39,558	52,689	33,329
Accounting Standards Update 2014-09 | Transferred over Time
Disaggregation of Revenue [Line Items]
University fees - subscription revenue	3,681	3,272	1,567
Total revenue from contracts with customers	3,681	3,272	1,567
Accounting Standards Update 2014-09 | Interchange and card revenue | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30,695	41,509	24,681
Accounting Standards Update 2014-09 | Deposit fees | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,824	10,039	8,067
Accounting Standards Update 2014-09 | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,071	1,972	1,760
Accounting Standards Update 2014-09 | Customers Bank Business Banking | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
University fees - card and disbursement fees	0	0	0
Total revenue from contracts with customers	2,071	1,972	1,760
Accounting Standards Update 2014-09 | Customers Bank Business Banking | Transferred over Time
Disaggregation of Revenue [Line Items]
University fees - subscription revenue	0	0	0
Total revenue from contracts with customers	0	0	0
Accounting Standards Update 2014-09 | Customers Bank Business Banking | Interchange and card revenue | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	794	782	620
Accounting Standards Update 2014-09 | Customers Bank Business Banking | Deposit fees | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,277	1,190	1,140
Accounting Standards Update 2014-09 | BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	41,168	53,989	33,136
Accounting Standards Update 2014-09 | BankMobile | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
University fees - card and disbursement fees	1,039	1,141	581
Total revenue from contracts with customers	37,487	50,717	31,569
Accounting Standards Update 2014-09 | BankMobile | Transferred over Time
Disaggregation of Revenue [Line Items]
University fees - subscription revenue	3,681	3,272	1,567
Total revenue from contracts with customers	3,681	3,272	1,567
Accounting Standards Update 2014-09 | BankMobile | Interchange and card revenue | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	29,901	40,727	24,061
Accounting Standards Update 2014-09 | BankMobile | Deposit fees | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 6,547	$ 8,849	$ 6,927