Customers Bancorp (CUBI) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	CUBI
Entity Registrant Name	Customers Bancorp, Inc.
Entity Central Index Key	1,488,813
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,806,122

Consolidated Balance Sheet - Un

Consolidated Balance Sheet - Unaudited - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 13,318	$ 37,485
Interest-earning deposits	206,162	227,224
Cash and cash equivalents	219,480	264,709
Investment securities available for sale, at fair value	584,823	493,474
Loans held for sale (includes $1,963,076 and $2,117,510, respectively, at fair value)	2,113,293	2,117,510
Loans receivable	7,061,338	6,154,637
Allowance for loan losses	(38,314)	(37,315)
Total loans receivable, net of allowance for loan losses	7,023,024	6,117,322
FHLB, Federal Reserve Bank, and other restricted stock	98,611	68,408
Accrued interest receivable	27,135	23,690
Bank premises and equipment, net	12,369	12,769
Bank-owned life insurance	255,683	161,494
Other real estate owned	1,059	3,108
Goodwill and other intangibles	16,604	17,621
Other assets	119,748	102,631
Total assets	10,471,829	9,382,736
Deposits:
Demand, non-interest bearing	1,427,304	966,058
Interest-bearing	6,169,772	6,337,717
Total deposits	7,597,076	7,303,775
Federal funds purchased	147,000	83,000
FHLB advances	1,462,343	868,800
Other borrowings	186,258	87,123
Subordinated debt	108,856	108,783
Accrued interest payable and other liabilities	59,654	75,383
Total liabilities	9,561,187	8,526,864
Shareholders’ equity:
Preferred stock, par value $1.00 per share; liquidation preference $25.00 per share; 100,000,000 shares authorized, 9,000,000 shares issued and outstanding as of September 30, 2017 and December 31, 2016	217,471	217,471
Common stock, par value $1.00 per share; 200,000,000 shares authorized; 31,317,892 and 30,820,177 shares issued as of September 30, 2017 and December 31, 2016; 30,787,632 and 30,289,917 shares outstanding as of September 30, 2017 and December 31, 2016	31,318	30,820
Additional paid in capital	429,633	427,008
Retained earnings	240,076	193,698
Accumulated other comprehensive income (loss), net	377	(4,892)
Treasury stock, at cost (530,260 shares as of September 30, 2017 and December 31, 2016)	(8,233)	(8,233)
Total shareholders’ equity	910,642	855,872
Total liabilities and shareholders’ equity	$ 10,471,829	$ 9,382,736

Consolidated Balance Sheet - U3

Consolidated Balance Sheet - Unaudited (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans held for sale at fair value	$ 2,113,473	$ 2,117,510
Preferred stock, par value (usd per share)	$ 1	$ 1
Preferred stock, liquidation preference (usd per share)	$ 25	$ 25
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, shares issued (shares)	9,000,000	9,000,000
Preferred stock, shares outstanding (shares)	9,000,000	9,000,000
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock, shares issued (shares)	31,317,892	30,820,177
Common stock, shares outstanding (shares)	30,787,632	30,289,917
Treasury stock, shares (shares)	530,260	530,260
Significant Other Observable Inputs (Level 2)
Loans held for sale at fair value	$ 1,963,076	$ 2,117,510

Consolidated Statements of Inco

Consolidated Statements of Income - Unaudited - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans receivable	$ 67,107	$ 60,362	$ 195,605	$ 173,847
Loans held for sale	21,633	18,737	53,103	50,272
Investment securities	7,307	3,528	21,017	10,875
Other	2,238	1,585	5,507	3,937
Total interest income	98,285	84,212	275,232	238,931
Interest expense:
Deposits	18,381	13,009	48,934	34,365
Other borrowings	3,168	1,642	6,767	4,867
FHLB advances	7,032	3,291	15,433	9,274
Subordinated debt	1,685	1,685	5,055	5,055
Total interest expense	30,266	19,627	76,189	53,561
Net interest income	68,019	64,585	199,043	185,370
Provision for loan losses	2,352	88	5,937	2,854
Net interest income after provision for loan losses	65,667	64,497	193,106	182,516
Non-interest income:
Interchange and card revenue	9,570	11,547	31,729	13,806
Gain (loss) on sale of investment securities	5,349	(1)	8,532	25
Deposit fees	2,659	4,218	7,918	5,260
Mortgage warehouse transactional fees	2,396	3,080	7,139	8,702
Bank-owned life insurance	1,672	1,386	5,297	3,629
Gain on sale of SBA and other loans	1,144	1,206	3,045	2,135
Mortgage banking income	257	287	703	737
Impairment loss on investment securities	(8,349)	0	(12,934)	0
Other	3,328	5,763	7,741	6,943
Total non-interest income	18,026	27,486	59,170	41,237
Non-interest expense:
Salaries and employee benefits	24,807	22,681	69,569	58,051
Technology, communication and bank operations	14,401	12,525	33,227	19,021
Professional services	7,403	7,006	21,142	13,213
Occupancy	2,857	2,450	8,228	7,248
FDIC assessments, taxes, and regulatory fees	2,475	2,726	6,615	11,191
Provision for operating losses	1,509	1,406	4,901	1,943
Loan workout	915	592	1,844	1,497
Other real estate owned	445	1,192	550	1,663
Advertising and promotion	404	591	1,108	1,178
Acquisition related expenses	0	144	0	1,195
Other	5,824	4,905	13,634	12,106
Total non-interest expense	61,040	56,218	160,818	128,306
Income before income tax expense	22,653	35,765	91,458	95,447
Income tax expense	14,899	14,558	34,236	36,572
Net income	7,754	21,207	57,222	58,875
Preferred stock dividends	3,615	2,552	10,844	5,900
Net income (loss) available to common shareholders	$ 4,139	$ 18,655	$ 46,378	$ 52,975
Basic earnings per common share (usd per share)	$ 0.13	$ 0.68	$ 1.52	$ 1.95
Diluted earnings per common share (usd per share)	$ 0.13	$ 0.63	$ 1.42	$ 1.80

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 7,754	$ 21,207	$ 57,222	$ 58,875
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains on securities arising during the period	(3,570)	329	15,192	15,256
Income tax effect	1,393	(124)	(5,924)	(5,721)
Reclassification adjustments for (gains) losses on securities included in net income	(5,349)	1	(8,532)	(25)
Income tax effect	2,086	0	3,327	9
Net unrealized (losses) gains on available-for-sale securities	(5,440)	206	4,063	9,519
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	171	890	(189)	(2,523)
Income tax effect	(67)	(334)	74	946
Reclassification adjustment for losses included in net income	572	703	2,166	1,306
Income tax effect	(223)	(264)	(845)	(490)
Net unrealized gains (losses) on cash flow hedges	453	995	1,206	(761)
Other comprehensive (loss) income, net of income tax effect	(4,987)	1,201	5,269	8,758
Comprehensive income	$ 2,767	$ 22,408	$ 62,491	$ 67,633

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - Unaudited - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
Beginning balance, preferred stock (shares) at Dec. 31, 2015		2,300,000
Beginning balance, common stock (shares) at Dec. 31, 2015			26,901,801
Beginning balance at Dec. 31, 2015	$ 553,902	$ 55,569	$ 27,432	$ 362,607	$ 124,511	$ (7,984)	$ (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	58,875				58,875
Other comprehensive income	8,758					8,758
Issuance of stock, net of offering costs (shares)		6,700,000	226,677
Issuance of stock, net of offering costs	5,677	$ 161,980	$ 227	5,450
Preferred stock dividends	(5,900)				(5,900)
Share-based compensation expense	4,569			4,569
Exercise of warrants (shares)			259,851
Exercise of warrants	1,121		$ 259	862
Issuance of common stock under share-based compensation arrangements (shares)			155,888
Issuance of common stock under share-based compensation arrangements	829		$ 156	673
Ending balance, preferred stock (shares) at Sep. 30, 2016		9,000,000
Ending balance, common stock (shares) at Sep. 30, 2016			27,544,217
Ending balance at Sep. 30, 2016	789,811	$ 217,549	$ 28,074	374,161	177,486	774	(8,233)
Beginning balance at Jun. 30, 2016						(427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,207
Other comprehensive income	1,201
Ending balance, preferred stock (shares) at Sep. 30, 2016		9,000,000
Ending balance, common stock (shares) at Sep. 30, 2016			27,544,217
Ending balance at Sep. 30, 2016	$ 789,811	$ 217,549	$ 28,074	374,161	177,486	774	(8,233)
Beginning balance, preferred stock (shares) at Dec. 31, 2016	9,000,000	9,000,000
Beginning balance, common stock (shares) at Dec. 31, 2016	30,289,917		30,289,917
Beginning balance at Dec. 31, 2016	$ 855,872	$ 217,471	$ 30,820	427,008	193,698	(4,892)	(8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,222				57,222
Other comprehensive income	5,269					5,269
Preferred stock dividends	(10,844)				(10,844)
Share-based compensation expense	4,536			4,536
Exercise of warrants (shares)			50,387
Exercise of warrants	557		$ 50	507
Issuance of common stock under share-based compensation arrangements (shares)			447,328
Issuance of common stock under share-based compensation arrangements	$ (1,970)		$ 448	(2,418)
Ending balance, preferred stock (shares) at Sep. 30, 2017	9,000,000	9,000,000
Ending balance, common stock (shares) at Sep. 30, 2017	30,787,632		30,787,632
Ending balance at Sep. 30, 2017	$ 910,642	$ 217,471	$ 31,318	429,633	240,076	377	(8,233)
Beginning balance at Jun. 30, 2017						5,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,754
Other comprehensive income	$ (4,987)
Ending balance, preferred stock (shares) at Sep. 30, 2017	9,000,000	9,000,000
Ending balance, common stock (shares) at Sep. 30, 2017	30,787,632		30,787,632
Ending balance at Sep. 30, 2017	$ 910,642	$ 217,471	$ 31,318	$ 429,633	$ 240,076	$ 377	$ (8,233)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity - Unaudited (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Common Stock
Offering costs	$ 217
Preferred Stock
Offering costs	$ 5,520

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income	$ 57,222	$ 58,875
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses, net of change to FDIC receivable and clawback liability	5,937	2,854
Depreciation and amortization	7,476	4,138
Share-based compensation expense	5,377	5,213
Deferred taxes	286	(4,846)
Net amortization of investment securities premiums and discounts	520	664
Gain on sale of investment securities	(8,532)	(25)
Impairment loss on investment securities	12,934	0
Gain on sale of SBA and other loans	(3,553)	(2,674)
Origination of loans held for sale	(22,770,726)	(27,092,862)
Proceeds from the sale of loans held for sale	22,925,668	26,473,789
Decrease in FDIC loss sharing receivable net of clawback liability	0	255
Amortization of fair value discounts and premiums	93	312
Net loss on sales of other real estate owned	154	85
Valuation and other adjustments to other real estate owned, net of FDIC receivable	298	1,261
Earnings on investment in bank-owned life insurance	(5,297)	(3,629)
Increase in accrued interest receivable and other assets	(27,862)	(38,672)
(Decrease) increase in accrued interest payable and other liabilities	(14,106)	66,577
Net Cash Provided By (Used In) Operating Activities	185,889	(528,685)
Cash Flows from Investing Activities
Proceeds from maturities, calls and principal repayments of securities available for sale	36,461	46,097
Proceeds from sales of investment securities available for sale	698,451	2,853
Purchases of investment securities available for sale	(796,594)	(5,000)
Net increase in loans	(921,049)	(641,093)
Proceeds from sales of loans	124,703	91,868
Purchase of loans	(262,641)	0
Purchases of bank-owned life insurance	(90,000)	0
Proceeds from bank-owned life insurance	1,418	619
Net (purchases of) proceeds from FHLB, Federal Reserve Bank, and other restricted stock	(30,203)	19,220
Payments to the FDIC on loss sharing agreements	0	(2,049)
Purchases of bank premises and equipment	(1,725)	(3,343)
Proceeds from sales of other real estate owned	1,680	419
Acquisition of Disbursements business, net	0	(17,000)
Net Cash Used In Investing Activities	(1,267,428)	(507,409)
Cash Flows from Financing Activities
Net increase in deposits	293,301	1,479,471
Net increase (decrease) in short-term borrowed funds from the FHLB	593,543	(663,600)
Net increase (decrease) in federal funds purchased	64,000	(18,000)
Proceeds from long-term FHLB borrowings	0	75,000
Net proceeds from issuance of long-term debt	98,564	0
Net proceeds from issuance of preferred stock	0	161,980
Preferred stock dividends paid	(10,844)	(5,450)
Exercise of warrants	557	1,121
Payments of employee taxes withheld from share-based awards	(4,923)	(702)
Proceeds from issuance of common stock	2,112	7,269
Net Cash Provided By Financing Activities	1,036,310	1,037,089
Net (Decrease) Increase in Cash and Cash Equivalents	(45,229)	995
Cash and Cash Equivalents – Beginning	264,709	264,593
Cash and Cash Equivalents – Ending	219,480	265,588
Supplementary Cash Flows Information
Interest paid	70,706	50,410
Income taxes paid	31,545	40,966
Non-cash items:
Transfer of loans to other real estate owned	83	605
Transfer of loans held for investment to loans held for sale	$ 150,638	$ 0

Description of the Business

Description of the Business	9 Months Ended
	Sep. 30, 2017
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, New York (Westchester County); Hamilton, New Jersey (Mercer County); Boston, Massachusetts; Providence, Rhode Island; Portsmouth, New Hampshire (Rockingham County); Manhattan, New York; and nationally for certain loan and deposit products. The Bank has 14 full-service branches and provides commercial banking products, primarily loans and deposits. In addition, Customers Bank also administratively supports loan and other financial products to customers through its limited-purpose offices in Boston, Massachusetts, Providence, Rhode Island, Portsmouth, New Hampshire, Manhattan and Melville, New York, and Philadelphia, Pennsylvania. 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. The combination of the BankMobile technology software platform with the Vibe Student Checking and Refund Management Disbursement Services business (the "Disbursement business") acquired from Higher One Holdings, Inc. and Higher One, Inc. (together, "Higher One") in June 2016 propelled BankMobile to one of the largest mobile banking services in the United States by number of customers. Customers has announced its intent to spin-off BankMobile to Customers’ shareholders through a tax-free spin-off/merger transaction. Accordingly, the assets and liabilities of BankMobile will not be reported separately as held for sale, and its operating results and associated cash flows will not be reported as discontinued operations, until execution of the spin-off/merger transaction and will be considered held and used for all periods presented. Previously reported held-for-sale balances in the consolidated balance sheet as of December 31, 2016, and corresponding operating results and cash flows for the periods presented, have been reclassified to conform with the current period consolidated financial statement presentation. See NOTE 3 TAX-FREE SPIN-OFF AND MERGER. Customers 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.

Acquisition Activity

Acquisition Activity	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisition Activity	ACQUISITION ACTIVITY On June 15, 2016 , Customers completed the acquisition of substantially all of the assets and the assumption of certain liabilities of the Disbursement business from Higher One. The acquisition was completed pursuant to the terms of an Asset Purchase Agreement (the "Purchase Agreement") dated as of December 15, 2015 between Customers and Higher One. Under the terms of the Purchase Agreement, Customers also acquired all existing relationships with vendors and educational institutions, and all intellectual property and assumed normal business related liabilities. In conjunction with the acquisition, Customers hired approximately 225 Higher One employees primarily located in New Haven, Connecticut that manage the Disbursement business and serve the Disbursement business customers. The transaction contemplates aggregate guaranteed payments to Higher One of $42 million . The aggregate purchase price payable by Customers is $37 million in cash, with the payments to be made as follows: (i) $17 million in cash paid upon the closing of the acquisition, (ii) $10 million in cash upon the first anniversary of the closing and (iii) $10 million in cash paid upon the second anniversary of the closing. In accordance with the terms of the agreement, $10 million was paid to Higher One in June 2017. In addition, concurrently with the closing, the parties entered into a Transition Services Agreement pursuant to which Higher One provided certain transition services to Customers through June 30, 2017. As consideration for these services, Customers paid Higher One an additional $5 million in cash. Customers also will be required to make additional payments to Higher One if, during the three years following the closing, revenues from the acquired Disbursement business exceed $75 million in a year. The potential payment is equal to 35% of the amount the Disbursement business related revenue exceeds $75 million in each year. As of September 30, 2017 , Customers has not recorded a liability for any additional contingent consideration payable under the Purchase Agreement. As specified in the Purchase Agreement, the payments of $10 million payable to Higher One upon each of the first and second anniversary of the transaction closing were placed into an escrow account with a third party. The escrow account with $10 million and $20 million , respectively, as of September 30, 2017 and December 31, 2016 in aggregate restricted cash and the corresponding obligation to pay Higher One pursuant to the terms of the Purchase Agreement have been assigned to BankMobile and are included with "Cash and cash equivalents" and "Accrued interest payable and other liabilities" on the September 30, 2017 and December 31, 2016 consolidated balance sheets. For more information regarding Customers' plans for BankMobile and the presentation of BankMobile within the consolidated financial statements, see NOTE 3 - TAX-FREE SPIN-OFF AND MERGER. The assets acquired and liabilities assumed were initially presented at their estimated fair values based on a preliminary allocation of the purchase price. In many cases, the determination of these fair values required management to make estimates about discount rates, future expected cash flows, market conditions and other future events that were highly subjective and subject to change. The fair value estimates were considered preliminary and subject to change for up to one year after the closing date of the acquisition as additional information became available. Based on a preliminary purchase price allocation, Customers recorded $4.3 million in goodwill as a result of the acquisition. At December 31, 2016, Customers recorded adjustments to the estimated fair values of prepaid expenses and other liabilities, which resulted in a $1.0 million increase in goodwill. The adjusted amount of goodwill of $5.3 million reflects the excess purchase price over the estimated fair value of the net assets acquired. The goodwill recorded is deductible for tax purposes. The purchase price allocation was considered final as of June 30, 2017. The following table summarizes the final adjusted amounts recognized for assets acquired and liabilities assumed: (amounts in thousands) Fair value of assets acquired: Developed software $ 27,400 Other intangible assets 9,300 Accounts receivable 2,784 Prepaid expenses 418 Fixed assets, net 229 Total assets acquired 40,131 Fair value of liabilities assumed: Other liabilities 5,735 Deferred revenue 2,655 Total liabilities assumed 8,390 Net assets acquired $ 31,741 Transaction cash consideration (1) $ 37,000 Goodwill recognized $ 5,259 (1) Includes $10 million payable to Higher One upon each of the first and second anniversary of the transaction closing, which has been placed into an escrow account with a third party (aggregate amount of $20 million at December 31, 2016). Customers paid the first $10 million due to Higher One in June 2017. The fair value for the developed software was estimated based on expected revenue attributable to the software utilizing a discounted cash flow methodology giving consideration to potential obsolescence. The developed software is being amortized over ten years based on the estimated economic benefits received. The fair values for the other intangible assets represent the value of existing student and university relationships and a non-compete agreement with Higher One based on estimated retention rates and discounted cash flows. Other intangible assets are being amortized over an estimated life ranging from four to twenty years . Because BankMobile met the criteria to be classified as held for sale at December 31, 2016, the acquired assets were not depreciated or amortized during first quarter 2017 and second quarter 2017. The reclassification of the acquired assets as held and used as of September 30, 2017 resulted in depreciation and amortization expense for the developed software, other intangible assets, and fixed assets totaling $3.5 million in third quarter 2017. The acquired assets were reclassified to held and used at their carrying amounts, adjusted for depreciation and amortization for the periods they were classified as held for sale, which was lower than their estimated fair values as of September 30, 2017.

Tax-Free Spin-Off and Merger

Tax-Free Spin-Off and Merger	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Tax-Free Spin-Off and Merger	In third quarter 2017, Customers decided that the best strategy for its shareholders for divesting BankMobile was to spin-off BankMobile to Customers’ shareholders through a spin-off/merger transaction. The tax-free spin-off is expected to be followed by a merger of Customers' BankMobile Technologies, Inc. subsidiary ("BMT") into Clearwater Florida based Flagship Community Bank ("Flagship"), with Customers' shareholders receiving shares of Flagship common stock in exchange for shares of BMT they receive in the spin-off. Flagship is expected to separately purchase BankMobile deposits directly from Customers for cash. Following completion of the spin-off and merger and other transactions contemplated in a purchase and sale agreement between Customers and Flagship, Customers' shareholders would receive collectively more than 50% of Flagship common stock, valued at approximately $110 million . The common stock of the merged entities, to be called BankMobile, is expected to be listed on a national securities exchange after completion of the transactions. Customers believes the transactions will be treated as a tax-free exchange for both Customers' shareholders and Customers. Customers expects to execute an Amended and Restated Purchase and Assumption Agreement and Plan of Merger (the “Amended Agreement”) with Flagship to effect the spin-off and merger and Flagship’s purchase of BankMobile deposits from Customers. Customers expects that the Amended Agreement will provide that completion of the transactions will be subject to the receipt of all necessary regulatory approvals, certain Flagship shareholder approvals, successful raising of capital by Flagship, and other customary closing conditions. Customers expects the transaction to close in mid-2018 . At December 31, 2016, BankMobile met the criteria to be classified as held for sale, and accordingly the assets and liabilities of BankMobile were presented as “Assets held for sale,” “Non-interest bearing deposits held for sale,” and “Other liabilities held for sale” and BankMobile’s operating results and associated cash flows were presented as “Discontinued operations”. However, with the third quarter 2017 spin-off/merger decision, generally accepted accounting principles require that assets, liabilities, operating results, and cash flows associated with a business to be disposed of through a spin-off/merger transaction not be reported as held for sale or discontinued operations until execution of the spin-off/merger transaction. Accordingly, BankMobile's assets, liabilities, operating results and cash flows will not be reported separately as held for sale or discontinued operations at September 30, 2017 and December 31, 2016 and for the three and nine month periods ended September 30, 2017 and 2016 and instead will be reported as held and used. As a result, Customers measured the business at the lower of its (i) carrying amount before it was classified as held for sale, adjusted for depreciation and amortization expense that would have been recognized had the business been continuously classified as held and used, or (ii) fair value at the date the decision not to sell was made. Customers recorded a charge of $4.2 million in third quarter 2017 relating to the amount of depreciation and amortization expense that would have been recorded had the assets been continuously classified as held and used. Prior reported December 31, 2016 assets held for sale, non-interest bearing deposits held for sale and other liabilities held for sale have been reclassified to conform with the current period presentation as summarized below. Amounts previously reported as discontinued operations have also been reclassified to conform with the current period presentation within the accompanying consolidated financial statements as summarized below. Customers will continue reporting the Community Business Banking and BankMobile segment results. See NOTE 14 - BUSINESS SEGMENTS . The following summarizes the effect of the reclassification from held for sale classification to held and used classification on the previously reported consolidated balance sheet as of December 31, 2016 and the previously reported consolidated statements of income for the the three and nine months ended September 30, 2016: December 31, 2016 As Previously Reported Effect of Reclassification From Held For Sale to Held and Used December 31, 2016 After Reclassification (amounts in thousands) ASSETS Cash and cash equivalents $ 244,709 $ 20,000 $ 264,709 Loans receivable 6,142,390 12,247 6,154,637 Bank premises and equipment, net 12,259 510 12,769 Goodwill and other intangibles 3,639 13,982 17,621 Assets held for sale 79,271 (79,271 ) — Other assets 70,099 32,532 102,631 LIABILITIES Demand, non-interest bearing deposits $ 512,664 $ 453,394 $ 966,058 Interest bearing deposits 6,334,316 3,401 6,337,717 Non-interest bearing deposits held for sale 453,394 (453,394 ) — Other liabilities held for sale 31,403 (31,403 ) — Accrued interest payable and other liabilities 47,381 28,002 75,383 Three Months Ended September 30, 2016 Effect of Reclassification From Held For Sale to Held and Used Three Months Ended September 30, 2016 As Previously Reported After Reclassification Interest income $ 84,212 $ — $ 84,212 Interest expense 19,622 5 19,627 Net interest income 64,590 (5 ) 64,585 Provision for loan losses (161 ) 249 88 Non-interest income 11,121 16,365 27,486 Non-interest expenses 36,750 19,468 56,218 Income from continuing operations before income taxes 39,122 (3,357 ) 35,765 Provision for income taxes 15,834 (1,276 ) 14,558 Net income from continuing operations 23,288 (2,081 ) 21,207 Loss from discontinued operations before income taxes (3,357 ) 3,357 — Income tax benefit from discontinued operations (1,276 ) 1,276 — Net loss from discontinued operations (2,081 ) 2,081 — Net income 21,207 — 21,207 Preferred stock dividend 2,552 — 2,552 Net income available to common shareholders $ 18,655 $ — $ 18,655 Nine Months Ended September 30, 2016 Effect of Reclassification From Held For Sale to Held and Used Nine Months Ended September 30, 2016 As Previously Reported After Reclassification Interest income $ 238,931 $ — $ 238,931 Interest expense 53,548 13 53,561 Net interest income 185,383 (13 ) 185,370 Provision for loan losses 2,605 249 2,854 Non-interest income 22,241 18,996 41,237 Non-interest expenses 100,706 27,600 128,306 Income from continuing operations before income taxes 104,313 (8,866 ) 95,447 Provision for income taxes 39,942 (3,370 ) 36,572 Net income from continuing operations 64,371 (5,496 ) 58,875 Loss from discontinued operations before income taxes (8,865 ) 8,865 — Income tax benefit from discontinued operations (3,369 ) 3,369 — Net loss from discontinued operations (5,496 ) 5,496 — Net income 58,875 — 58,875 Preferred stock dividend 5,900 — 5,900 Net income available to common shareholders $ 52,975 $ — $ 52,975

Significant Accounting Policies

Significant Accounting Policies and Basis of Presentation	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies and Basis of Presentation	SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION Basis of Presentation The interim unaudited consolidated financial statements of Customers Bancorp and subsidiaries have been prepared pursuant to the rules and regulations of the SEC. These interim unaudited consolidated financial statements reflect all normal and recurring adjustments that are, in the opinion of management, necessary to present a fair statement of the financial position and the results of operations and cash flows of Customers Bancorp and subsidiaries for the interim periods presented. Certain information and footnote disclosures normally included in the annual consolidated financial statements have been omitted from these interim unaudited consolidated financial statements as permitted by SEC rules and regulations. The December 31, 2016 consolidated balance sheet presented in this report has been derived from Customers Bancorp’s audited 2016 consolidated financial statements. Management believes that the disclosures are adequate to present fairly the consolidated financial statements as of the dates and for the periods presented. These interim unaudited consolidated financial statements should be read in conjunction with the 2016 consolidated financial statements of Customers Bancorp and subsidiaries included in Customers' Annual Report on Form 10-K for the year ended December 31, 2016 filed with the SEC on March 8, 2017 . That Form 10-K describes Customers Bancorp’s significant accounting policies, which include its policies on Principles of Consolidation; Cash and Cash Equivalents and Statements of Cash Flows; Restrictions on Cash and Amounts due from Banks; Business Combinations; Investment Securities; Loan Accounting Framework; Allowance for Loan Losses; Goodwill and other Intangible Assets; Investments in FHLB, Federal Reserve Bank, and other restricted stock; Other Real Estate Owned; FDIC Loss Sharing Receivable and Clawback Liability; Bank-Owned Life Insurance; Bank Premises and Equipment; Treasury Stock; Income Taxes; Share-Based Compensation; Segments; Derivative Instruments and Hedging; Comprehensive Income; and Earnings per Share. Certain prior period amounts have been reclassified to conform to the current period presentation. Results for interim periods are not necessarily indicative of those that may be expected for the fiscal year. Reclassifications As described in NOTE 3 - TAX-FREE SPIN-OFF AND MERGER, as of September 30, 2017 , Customers reclassified BankMobile, a segment previously classified as held for sale to held and used, as it no longer met the held-for-sale criteria. Certain prior period amounts and note disclosures (including NOTE 9 and NOTE 12 ) have been reclassified to conform with the current period presentation. Except for these reclassifications, there have been no material changes to Customers' significant accounting policies as disclosed in Customers' Annual Report on Form 10-K for the year ended December 31, 2016 . Presented below are recently issued accounting standards that Customers has adopted as well as those that the Financial Accounting Standards Board (“FASB”) has issued but are not yet effective or that Customers has not yet adopted. Recently Issued Accounting Standards Accounting Standards Adopted in 2017 Since January 1, 2017, Customers has adopted the following FASB Accounting Standard Updates (“ASUs”), none of which had a material impact to Customers’ consolidated financial statements: • Customers adopted ASU 2016-05, Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, on a prospective basis. This ASU clarifies that a change in the counterparties to a derivative contract (i.e., a novation), in and of itself, does not require the de-designation of a hedging relationship provided that all the other hedge accounting criteria continue to be met. • Customers also adopted ASU 2016-06, Contingent Put and Call Options in Debt Instruments . This ASU clarifies that a contingency of put or call exercise does not need to be evaluated to determine whether it relates to interest rates and credit risk in an embedded derivative analysis of hybrid financial instruments. In other words, a contingent put or call option embedded in a debt instrument would be evaluated for possible separate accounting as a derivative instrument without regard to the nature of the exercise contingency. However, as required under the existing guidance, companies will still need to evaluate the other relevant embedded derivative guidance, such as whether the payoff from the contingent put or call option is adjusted based on changes in an index other than interest rates or credit risk, and whether the debt involves a substantial premium or discount. As the adoption did not result in any significant impact to Customers’ consolidated financial statements, it did not result in a modified retrospective application. • Customers also adopted ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting, on a prospective basis. This ASU eliminates the requirement for the retrospective use of the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence of an investor. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for the equity method of accounting. • Customers also adopted ASU 2016-17, Consolidation - Interests Held Through Related Parties that are Under Common Control . This ASU amends the guidance included in ASU 2015-02, Consolidation: Amendments to Consolidation Analysis which Customers adopted in first quarter 2016. This ASU makes a narrow amendment that requires that a single decision maker considers indirect economic interests in an entity held through related parties that are under common control on a proportionate basis when determining whether it is the primary beneficiary of that VIE. Prior to this amendment, indirect interests held through related parties that are under common control were to be considered equivalent of the single decision maker’s direct interests in their entirety which could result in a single decision maker consolidating the VIE. As the adoption did not result in any significant impact to Customers’ consolidated financial statements, it did not result in a full or modified retrospective application. Accounting Standards Issued But Not Yet Adopted In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities , which 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. The guidance 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 as the hedged item. The guidance also changes certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. This ASU is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption permitted. Customers plans to adopt this ASU by January 1, 2018. Adoption of this new guidance must be applied on a modified retrospective approach. While Customers continues to assess all potential impacts of the standard, Customers does not currently expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In July 2017, the FASB issued ASU 2017-11, Accounting for Certain Financial Instruments with Down Round Features , which will change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. 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. 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 income available to common shareholders in basic earnings per share ("EPS"). For public business entities, the amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Customers currently does not have any equity-linked financial instruments (or embedded features) with down round features, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting , which clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification in Accounting Standards Codification (“ASC”) 718. Under this ASU, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award as equity or a liability changes as a result of the change in terms or conditions. This ASU does not change the accounting for modifications under ASC 718. The ASU will be effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Adoption of this new guidance must be applied prospectively to an award modified on or after the adoption date. Customers generally does not modify the terms of conditions of its share-based payment awards, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities, which requires that premiums for certain callable debt securities held be amortized to their earliest call date. This ASU does not affect the accounting for securities purchased at a discount. This ASU will be effective for Customers for its first reporting period beginning after December 15, 2018, with earlier adoption permitted. Adoption of this new guidance must be applied on a modified retrospective approach. Customers currently has an immaterial amount of callable debt securities purchased with premiums, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In February 2017, the FASB issued ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which clarifies the scope and application of the accounting guidance on the sale of nonfinancial assets to non-customers, including partial sales. This ASU defines an in-substance nonfinancial asset, in part, as a financial asset promised to a counterparty in a contract if substantially all of the fair value of the assets (recognized and unrecognized) that are promised to the counterparty in the contract is concentrated in nonfinancial assets. 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. This ASU also unifies the guidance related to partial sales of nonfinancial assets, eliminates rules specifically addressing the sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. This ASU will be effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. The adoption of this new guidance must be applied on a full or modified retrospective basis. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment , which will simplify the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test that requires an entity to determine the implied fair value of its goodwill through a hypothetical purchase price allocation. Instead, under this ASU, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. All other goodwill impairment guidance will remain largely unchanged. The same one-step impairment test will be applied to goodwill at all reporting units, even those with zero or negative carrying amounts. Entities will also be required to disclose the amount of goodwill at reporting units with zero or negative carrying amounts. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. This ASU is effective for Customers for its first reporting period beginning after December 15, 2019. Early adoption is permitted for impairment tests performed after January 1, 2017. Customers expects to early adopt this ASU upon its next annual goodwill impairment test in 2017 and does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business , which 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. In addition, 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. Also, the amendments narrow the definition of the term “output” so that it is consistent with how outputs are defined in ASC Topic 606, Revenue from Contracts with Customers . This ASU is effective for Customers for its first reporting period beginning after December 15, 2017. Adoption of this new guidance must be applied on a prospective basis. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash , which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers does not expect the adoption to this ASU to have a significant impact on the presentation of its statement of cash flows. In October 2016, the FASB issued ASU 2016-16- Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory , which requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This 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. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments , which aims to reduce the existing diversity in practice with regards to the following specific items in the Statement of Cash Flows: 1. Cash payments for debt prepayment or extinguishment costs will be classified in financing activities. 2. Upon settlement of zero-coupon bonds and bonds with insignificant cash coupons, the portion of the payment attributable to imputed interest will be classified as an operating activity, while the portion of the payment attributable to principal will be classified as a financing activity. 3. Cash paid by an acquirer soon after a business combination (i.e. approximately three months or less) for the settlement of a contingent consideration liability will be classified in investing activities. Payments made thereafter should be separated between financing activities and operating activities. Cash payments up to the amount of the contingent consideration liability recognized at the acquisition date will be classified in financing activities; any excess will be classified in operating activities. 4. 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). Cash proceeds from lump-sum settlements will be classified based on the nature of each loss component included in the settlement. 5. Cash proceeds received from the settlement of bank-owned life insurance (BOLI) policies will be classified as cash inflows from investing activities. Cash payments for premiums on BOLI may be classified as cash outflows for investing, operating, or a combination of both. 6. 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. 7. Distributions received from equity method investees will be classified using either a cumulative earnings approach or a look-through approach as an accounting policy election. The ASU contains additional guidance clarifying when an entity should separate cash receipts and cash payments and classify them into more than one class of cash flows (including when reasonable judgment is required to estimate and allocate cash flows) versus when an entity should classify the aggregate amount into one class of cash flows on the basis of predominance. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers is currently evaluating the impact of this ASU and does not expect the ASU to have a material impact on the presentation of its statement of cash flows. In June 2016, the FASB issued ASU 2016-13 , Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") 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. This ASU will replace today’s “incurred loss” approach. The CECL model is expected to result in earlier recognition of credit losses. 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. It also simplifies the accounting model for purchased credit-impaired debt securities and loans. This ASU is effective for Customers for its first reporting period beginning after December 15, 2019. Earlier adoption is also permitted. Adoption of the new guidance 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. Customers is currently evaluating the impact of this ASU, initiating implementation efforts across the company, and planning for loss modeling requirements consistent with lifetime expected loss estimates. It is expected that the new model 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. 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. Customers currently does not intend to early adopt this new guidance. In March 2016, the FASB issued ASU 2016-04, Liabilities - Extinguishments of Liabilities: Recognition of Breakage for Certain Prepaid Stored-Value Products , that would require issuers of prepaid stored-value product (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. There is currently a diversity in the methodology used to recognize breakage. Subtopic 405-20, Extinguishment of Liabilities , includes derecognition guidance for both financial liabilities and nonfinancial liabilities, and Topic 606, Revenue from Contracts with Customers , includes authoritative breakage guidance but excludes financial liabilities. 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. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases , which supersedes the current lease accounting guidance for both lessees and lessors under ASC 840, Leases . From the lessee's perspective, the new standard establishes a right-of-use (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. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement for lessees. The new guidance 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. The new standard is effective for Customers for its first reporting period beginning after December 15, 2018. Early adoption is permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. A modified retrospective transition approach is required for lessors for sales-type, direct financing, and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. Customers is currently evaluating the impact of this ASU on its financial condition and results of operations and expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. Customers does not intend to early adopt this ASU. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance in this ASU among other things, (1) requires equity investments with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (3) 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, (4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (5) requires an entity to present separately in other comprehensive income 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, (6) 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 and (7) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities. The guidance in this ASU is effective for Customers for its first reporting period beginning after December 15, 2017, including interim periods within those fiscal years. Customers is in the process of evaluating the impacts of the adoption of this ASU, however, it does not expect the impact to be significant to its financial condition, results of operations and consolidated financial statements given the immaterial amount of its investment in equity securities. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , superseding the revenue recognition requirements in ASC 605. This ASU 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. The amendment includes a five-step process to assist an entity in achieving the main principle(s) of revenue recognition under ASC 605. In August 2015, the FASB issued ASU 2015-14, which formalized the deferral of the effective date of the amendment for a period of one-year from the original effective date. Following the issuance of ASU 2015-14, the amendment will be effective for Customers for its first reporting period beginning after December 15, 2017. In March 2016, the FASB also issued ASU 2016-08, an amendment to the guidance in ASU 2014-09, which 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. ASU 2016-08 also eliminated two of the indicators (the entity’s consideration is in the form of a commission and the entity is not exposed to credit risk) in making that determination. This amendment also clarifies that each indicator may be more or less relevant to the assessment depending on the terms and conditions of the contract. In April 2016, the FASB also issued ASU 2016-10, which clarifies the implementation guidance on identifying promised goods or services and on determining whether an entity's promise to grant a license with either a right to use the entity's intellectual property (which is satisfied at a point in time) or a right to access the entity's intellectual property (which is satisfied over time). In May 2016, the FASB issued ASU 2016-12, an amendment to ASU 2014-09, which provided practical expedients related to disclosures of remaining performance obligations, as well as other amendments to guidance on transition, collectability, non-cash consideration and the presentation of sales and other similar taxes. The amendments, collectively, should be applied retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Because the ASU does not apply to revenue associated with leases and financial instruments (including loans and securities), Customers current assessment is that the new guidance will 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 gain). Customers will adopt this ASU on January 1, 2018 using a modified retrospective approach. Customers has completed its identification of all revenue streams that are included in its financial statements and has identified its deposit related fees, service charges, debit card and prepaid card interchange income, and university fees to be within the scope of the standard. Customers is also substantially complete with its review of the related contracts and has also completed its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross vs. net). Customers' overall assessment suggests that adoption of this ASU will not materially change its current method and timing of recognizing revenue for these revenue streams. Customers, however, is still evaluating the ASU’s expanded disclosure requirements. As provided above, Customers current assessment is that the adoption of this ASU will not have a significant impact to its financial condition, results of operations and consolidated financial statements.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
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. Three Months Ended Nine Months Ended 2017 2016 2017 2016 (amounts in thousands, except share and per share data) Net income available to common shareholders $ 4,139 $ 18,655 $ 46,378 $ 52,975 Weighted-average number of common shares outstanding - basic 30,739,671 27,367,551 30,597,314 27,131,960 Share-based compensation plans 1,754,480 2,205,291 2,004,917 2,119,717 Warrants 18,541 124,365 24,392 243,531 Weighted-average number of common shares - diluted 32,512,692 29,697,207 32,626,623 29,495,208 Basic earnings per common share $ 0.13 $ 0.68 $ 1.52 $ 1.95 Diluted earnings per common share $ 0.13 $ 0.63 $ 1.42 $ 1.80 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 to do so would have been anti-dilutive for the periods presented. Three Months Ended Nine Months Ended 2017 2016 2017 2016 Anti-dilutive securities: Share-based compensation awards 409,225 616,995 409,225 616,995 Warrants 52,242 52,242 52,242 52,242 Total anti-dilutive securities 461,467 669,237 461,467 669,237

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss) By Component	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) By Component	CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (1) The following tables present the changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 (amounts in thousands) Unrealized Gains (Losses) on Available-For-Sale Securities Unrealized Total Balance - June 30, 2017 $ 6,822 $ (1,458 ) $ 5,364 Other comprehensive income (loss) before reclassifications (2,177 ) 104 (2,073 ) Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (3,263 ) 349 (2,914 ) Net current-period other comprehensive (loss) income (5,440 ) 453 (4,987 ) Balance - September 30, 2017 $ 1,382 $ (1,005 ) $ 377 Nine Months Ended September 30, 2017 (amounts in thousands) Unrealized Gains (Losses) on Available-For-Sale Securities Unrealized Total Balance - December 31, 2016 $ (2,681 ) $ (2,211 ) $ (4,892 ) Other comprehensive income (loss) before reclassifications 9,268 (115 ) 9,153 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (5,205 ) 1,321 (3,884 ) Net current-period other comprehensive income 4,063 1,206 5,269 Balance - September 30, 2017 $ 1,382 $ (1,005 ) $ 377 (1) All amounts are presented net of tax. Amounts in parentheses indicate reductions to accumulated other comprehensive income. (2) Reclassification amounts for available-for-sale securities are reported as gain on sale of investment securities on the consolidated statements of income. Reclassification amounts for cash flow hedges are reported as interest expense on FHLB advances on the consolidated statements of income. Three Months Ended September 30, 2016 Available-for-sale-securities (amounts in thousands) Unrealized Gains Foreign Currency Items Total Unrealized Gains Unrealized Loss on Cash Flow Hedge Total Balance - June 30, 2016 $ 4,895 $ (768 ) $ 4,127 $ (4,554 ) $ (427 ) Other comprehensive income (loss) before reclassifications 15 190 205 556 761 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) 1 — 1 439 440 Net current-period other comprehensive income 16 190 206 995 1,201 Balance - September 30, 2016 $ 4,911 $ (578 ) $ 4,333 $ (3,559 ) $ 774 Nine Months Ended September 30, 2016 Available-for-sale-securities (amounts in thousands) Unrealized Gains (Losses) Foreign Currency Items Total Unrealized Gains (Losses) Unrealized Loss on Cash Flow Hedge Total Balance - December 31, 2015 $ (4,602 ) $ (584 ) $ (5,186 ) $ (2,798 ) $ (7,984 ) Other comprehensive income (loss) before reclassifications 9,529 6 9,535 (1,577 ) 7,958 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (16 ) — (16 ) 816 800 Net current-period other comprehensive income (loss) 9,513 6 9,519 (761 ) 8,758 Balance - September 30, 2016 $ 4,911 $ (578 ) $ 4,333 $ (3,559 ) $ 774 (1) All amounts are presented net of tax. Amounts in parentheses indicate reductions to accumulated other comprehensive income. (2) Reclassification amounts for available-for-sale securities are reported as gain (loss) on sale of investment securities on the consolidated statements of income. Reclassification amounts for cash flow hedges are reported as interest expense on FHLB advances on the consolidated statements of income.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES The amortized cost and approximate fair value of investment securities as of September 30, 2017 and December 31, 2016 are summarized in the tables below: September 30, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available for Sale: Agency-guaranteed residential mortgage-backed securities $ 197,606 $ 521 $ (1,800 ) $ 196,327 Agency-guaranteed commercial real estate mortgage-backed securities 337,683 2,843 (418 ) 340,108 Corporate notes (1) 44,958 1,119 — 46,077 Equity securities (2) 2,311 — — 2,311 $ 582,558 $ 4,483 $ (2,218 ) $ 584,823 (1) Includes subordinated debt issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity. December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available for Sale: Agency-guaranteed residential mortgage-backed securities $ 233,002 $ 918 $ (2,657 ) $ 231,263 Agency-guaranteed commercial real estate mortgage-backed securities 204,689 — (2,872 ) 201,817 Corporate notes (1) 44,932 401 (185 ) 45,148 Equity securities (2) 15,246 — — 15,246 $ 497,869 $ 1,319 $ (5,714 ) $ 493,474 (1) Includes subordinated debt issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity. The following table presents proceeds from the sale of available-for-sale investment securities and gross gains and gross losses realized on those sales for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (amounts in thousands) Proceeds from sale of available-for-sale securities $ 554,540 $ 5 $ 698,451 $ 2,853 Gross gains $ 5,349 $ — $ 8,532 $ 26 Gross losses — (1 ) — (1 ) Net gains (losses) $ 5,349 $ (1 ) $ 8,532 $ 25 These gains (losses) were determined using the specific identification method and were reported as gain (loss) on sale of investment securities included in non-interest income on the consolidated statements of income. The following table presents 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, therefore, these debt securities are classified separately with no specific maturity date: September 30, 2017 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 42,958 43,854 Due after ten years 2,000 2,223 Agency-guaranteed residential mortgage-backed securities 197,606 196,327 Agency-guaranteed commercial real estate mortgage-backed securities 337,683 340,108 Total debt securities $ 580,247 $ 582,512 Gross unrealized losses and fair value of Customers' investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2017 and December 31, 2016 were as follows: September 30, 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: Agency-guaranteed residential mortgage-backed securities $ 54,525 $ (279 ) $ 45,682 $ (1,521 ) $ 100,207 $ (1,800 ) Agency-guaranteed commercial real estate mortgage-backed securities 105,044 (418 ) — — 105,044 (418 ) Total $ 159,569 $ (697 ) $ 45,682 $ (1,521 ) $ 205,251 $ (2,218 ) December 31, 2016 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: Agency-guaranteed residential mortgage-backed securities $ 87,433 $ (1,330 ) $ 30,592 $ (1,327 ) $ 118,025 $ (2,657 ) Agency-guaranteed commercial real estate mortgage-backed securities 201,817 (2,872 ) — — 201,817 (2,872 ) Corporate notes (1) 9,747 (185 ) — — 9,747 (185 ) Total $ 298,997 $ (4,387 ) $ 30,592 $ (1,327 ) $ 329,589 $ (5,714 ) (1) Includes subordinated debt issued by other bank holding companies. At September 30, 2017 , there were sixteen available-for-sale investment securities in the less-than-twelve-month category and eleven available-for-sale investment securities 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. All amounts 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. At September 30, 2017 , management evaluated its equity holdings issued by Religare Enterprises, Ltd. ("Religare") for other-than-temporary impairment. Because management no longer has the intent to hold these securities until a recovery in fair value, Customers recorded an other-than-temporary impairment loss of $8.3 million and $12.9 million , respectively, for the three and nine months ended September 30, 2017 for the full amount of the decline in fair value below the cost basis established at June 30, 2017 and December 31, 2016. The fair value of the equity securities at September 30, 2017 of $2.3 million became the new cost basis of the securities. Because of the change in disposition strategy for BankMobile at September 30, 2017, Customers did not record a deferred tax asset for the other-than-temporary impairment loss recorded in third quarter 2017. In addition, Customers reversed $4.6 million of previously recorded deferred tax assets in third quarter 2017 as the tax-free spin-off/merger strategy for BankMobile does not result in capital gains that could be used to offset any capital losses resulting from the disposition of the Religare equity securities. At September 30, 2017 and December 31, 2016 , Customers Bank had pledged investment securities aggregating $127.6 million and $231.3 million in fair value, 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.

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2017
Receivables Held-for-sale [Abstract]
Loans Held for Sale	LOANS HELD FOR SALE The composition of loans held for sale as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 (amounts in thousands) Commercial loans: Mortgage warehouse loans, at fair value $ 1,961,248 $ 2,116,815 Multi-family loans at lower of cost or fair value 150,217 — Total commercial loans held for sale 2,111,465 2,116,815 Consumer loans: Residential mortgage loans, at fair value 1,828 695 Loans held for sale $ 2,113,293 $ 2,117,510 Commercial loans held for sale consists predominately of commercial loans to mortgage companies (i.e., mortgage warehouse loans). These mortgage warehouse lending transactions are subject to master repurchase agreements and are designated as held for sale 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 loans (i.e., the purchase event) and receives proceeds directly from third party investors when the loans are sold into the secondary market (i.e., the sale event). 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 21 days from purchase to sale. The primary goal of these lending transactions is to provide liquidity to mortgage companies. Effective June 30, 2017, Customers Bank transferred $150.8 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 September 30, 2017, the estimated fair value of these loans was higher than their carrying value. Accordingly, a lower of cost or market value adjustment was not recorded in third quarter 2017. Effective December 31, 2016 , Customers Bank transferred $25.1 million of multi-family loans from 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 was lower than the estimated fair value at the time of transfer.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES The following table presents loans receivable as of September 30, 2017 and December 31, 2016 . BankMobile loans receivable previously reported as held for sale have been reclassified as held and used to conform with the current period presentation. September 30, 2017 December 31, 2016 (amounts in thousands) Commercial: Multi-family $ 3,618,989 $ 3,214,999 Commercial and industrial (including owner occupied commercial real estate) 1,601,789 1,382,343 Commercial real estate non-owner occupied 1,237,849 1,193,715 Construction 73,203 64,789 Total commercial loans 6,531,830 5,855,846 Consumer: Residential real estate 435,188 193,502 Manufactured housing 92,938 101,730 Other 3,819 3,483 Total consumer loans 531,945 298,715 Total loans receivable 7,063,775 6,154,561 Deferred (fees)/costs and unamortized (discounts)/premiums, net (2,437 ) 76 Allowance for loan losses (38,314 ) (37,315 ) Loans receivable, net of allowance for loan losses $ 7,023,024 $ 6,117,322 The following tables summarize loans receivable by loan type and performance status as of September 30, 2017 and December 31, 2016 : September 30, 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 $ — $ — $ — $ — $ 3,617,062 $ 1,927 $ 3,618,989 Commercial and industrial — — — 20,423 1,093,997 802 1,115,222 Commercial real estate - owner occupied — — — 2,949 472,832 10,786 486,567 Commercial real estate - non-owner occupied — — — 184 1,232,212 5,453 1,237,849 Construction — — — — 73,203 — 73,203 Residential real estate 1,607 — 1,607 4,269 423,551 5,761 435,188 Manufactured housing (5) 2,937 2,505 5,442 1,959 82,896 2,641 92,938 Other consumer 67 — 67 58 3,474 220 3,819 Total $ 4,611 $ 2,505 $ 7,116 $ 29,842 $ 6,999,227 $ 27,590 $ 7,063,775 December 31, 2016 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 $ 12,573 $ — $ 12,573 $ — $ 3,200,322 $ 2,104 $ 3,214,999 Commercial and industrial 350 — 350 8,443 978,881 1,037 988,711 Commercial real estate - owner occupied 137 — 137 2,039 379,227 12,229 393,632 Commercial real estate - non-owner occupied — — — 2,057 1,185,331 6,327 1,193,715 Construction — — — — 64,789 — 64,789 Residential real estate 4,417 — 4,417 2,959 178,559 7,567 193,502 Manufactured housing (5) 3,761 2,813 6,574 2,236 89,850 3,070 101,730 Other consumer 12 — 12 58 3,177 236 3,483 Total $ 21,250 $ 2,813 $ 24,063 $ 17,792 $ 6,080,136 $ 32,570 $ 6,154,561 (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. Because of 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 subject to 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 September 30, 2017 and December 31, 2016, the Bank had $0.3 million and $0.5 million , respectively, of residential real estate held in other real estate owned. As of September 30, 2017 and December 31, 2016, the Bank had initiated foreclosure proceedings of $1.5 million and $0.4 million , respectively, on loans secured by residential real estate. Allowance for loan losses The changes in the allowance for loan losses for the three and nine months ended September 30, 2017 and 2016 and the loans and allowance for loan losses by loan class based on impairment evaluation method as of September 30, 2017 and December 31, 2016 were as follows. The amounts presented for the provision for loan losses below do not include the effect of changes to estimated benefits resulting from the FDIC loss share arrangements for the covered loans for periods prior to the termination of the FDIC loss sharing arrangements. Three Months Ended September 30, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Construction Residential Manufactured Other Consumer Total (amounts in thousands) Ending Balance, June 30, 2017 $ 12,028 $ 11,585 $ 2,976 $ 7,786 $ 716 $ 2,995 $ 268 $ 104 $ 38,458 Charge-offs — (2,032 ) — (77 ) — (120 ) — (356 ) (2,585 ) Recoveries — 54 — — 27 7 — 1 89 Provision for loan losses 668 966 262 (53 ) 104 72 (77 ) 410 2,352 Ending Balance, September 30, 2017 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 Nine Months Ended September 30, 2017 Ending Balance, December 31, 2016 $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315 Charge-offs — (4,079 ) — (485 ) — (410 ) — (602 ) (5,576 ) Recoveries — 337 9 — 157 34 — 101 638 Provision for loan losses 1,094 3,265 1,046 247 (150 ) (12 ) (95 ) 542 5,937 Ending Balance, September 30, 2017 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 As of September 30, 2017 Loans: Individually evaluated for impairment $ — $ 20,493 $ 2,950 $ 184 $ — $ 8,178 $ 10,340 $ 56 $ 42,201 Collectively evaluated for impairment 3,617,062 1,093,927 472,831 1,232,212 73,203 421,249 79,957 3,543 6,993,984 Loans acquired with credit deterioration 1,927 802 10,786 5,453 — 5,761 2,641 220 27,590 $ 3,618,989 $ 1,115,222 $ 486,567 $ 1,237,849 $ 73,203 $ 435,188 $ 92,938 $ 3,819 $ 7,063,775 Allowance for loan losses: Individually evaluated for impairment $ — $ 625 $ 740 $ — $ — $ 142 $ 5 $ 15 $ 1,527 Collectively evaluated for impairment 12,696 9,462 2,481 4,732 847 2,222 83 93 32,616 Loans acquired with credit deterioration — 486 17 2,924 — 590 103 51 4,171 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 Three Months Ended September 30, 2016 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Construction Residential Manufactured Other Consumer Total (amounts in thousands) Ending Balance, June 30, 2016 $ 12,368 $ 10,370 $ 1,582 $ 8,483 $ 1,209 $ 3,535 $ 440 $ 110 $ 38,097 Charge-offs — (237 ) — (140 ) — (43 ) — (246 ) (666 ) Recoveries — 62 — — 8 298 — 10 378 Provision for loan losses (695 ) 832 305 3 (168 ) (411 ) (18 ) 240 88 Ending Balance, September 30, 2016 $ 11,673 $ 11,027 $ 1,887 $ 8,346 $ 1,049 $ 3,379 $ 422 $ 114 $ 37,897 Nine Months Ended September 30, 2016 Ending Balance, December 31, 2015 $ 12,016 $ 8,864 $ 1,348 $ 8,420 $ 1,074 $ 3,298 $ 494 $ 133 $ 35,647 Charge-offs — (774 ) — (140 ) — (456 ) — (478 ) (1,848 ) Recoveries — 173 — 8 465 299 — 10 955 Provision for loan losses (343 ) 2,764 539 58 (490 ) 238 (72 ) 449 3,143 Ending Balance, September 30, 2016 $ 11,673 $ 11,027 $ 1,887 $ 8,346 $ 1,049 $ 3,379 $ 422 $ 114 $ 37,897 As of December 31, 2016 Loans: Individually evaluated for impairment $ — $ 8,516 $ 2,050 $ 2,151 $ — $ 6,972 $ 9,665 $ 57 $ 29,411 Collectively evaluated for impairment 3,212,895 979,158 379,353 1,185,237 64,789 178,963 88,995 3,190 6,092,580 Loans acquired with credit deterioration 2,104 1,037 12,229 6,327 — 7,567 3,070 236 32,570 $ 3,214,999 $ 988,711 $ 393,632 $ 1,193,715 $ 64,789 $ 193,502 $ 101,730 $ 3,483 $ 6,154,561 Allowance for loan losses: Individually evaluated for impairment $ — $ 1,024 $ 287 $ 14 $ — $ 35 $ — $ — $ 1,360 Collectively evaluated for impairment 11,602 9,686 1,896 4,626 772 2,414 88 60 31,144 Loans acquired with credit deterioration — 340 — 3,254 68 893 198 58 4,811 $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315 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 September 30, 2017 and December 31, 2016 , funds available for reimbursement, if necessary, were $0.7 million and $1.0 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 September 30, 2017 and December 31, 2016 and the average recorded investment and interest income recognized for the three and nine months ended September 30, 2017 and 2016 . Purchased-credit-impaired loans are considered to be performing and are not included in the tables below. September 30, 2017 Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 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: Commercial and industrial $ 19,433 $ 22,354 $ — $ 13,345 $ 354 $ 8,796 $ 450 Commercial real estate owner occupied 1,669 1,936 — 1,744 15 1,589 18 Commercial real estate non-owner occupied 184 428 — 184 91 989 93 Other consumer 32 32 — 44 — 50 — Residential real estate 7,457 7,664 — 5,228 125 4,865 126 Manufactured housing 10,340 10,340 — 10,243 164 10,038 457 With an allowance recorded: Commercial and industrial 1,060 1,331 625 1,963 — 5,400 22 Commercial real estate owner occupied 1,281 1,281 740 1,056 1 950 3 Commercial real estate non-owner occupied — — — 51 — 94 — Other consumer 24 24 15 12 — 6 — Residential real estate 721 741 142 2,862 — 2,729 84 Manufactured housing — — 5 114 — 108 8 Total $ 42,201 $ 46,131 $ 1,527 $ 36,846 $ 750 $ 35,614 $ 1,261 December 31, 2016 Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 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 $ — $ — $ — $ 2,080 $ 38 $ 1,205 $ 38 Commercial and industrial 2,396 3,430 — 21,859 406 18,681 879 Commercial real estate owner occupied 1,210 1,210 — 10,182 201 9,651 403 Commercial real estate non-owner occupied 2,002 2,114 — 7,983 118 6,081 133 Other consumer 57 57 — 43 — 45 — Residential real estate 6,682 6,749 — 3,835 39 4,039 83 Manufactured housing 9,665 9,665 — 8,971 9 8,785 290 With an allowance recorded: Multi-family — — — 383 5 290 15 Commercial and industrial 6,120 6,120 1,024 7,561 43 7,256 155 Commercial real estate - owner occupied 840 840 287 — — 6 — Commercial real estate non-owner occupied 149 204 14 328 2 438 6 Other consumer — — — — — 36 — Residential real estate 290 303 35 300 — 421 — Total $ 29,411 $ 30,692 $ 1,360 $ 63,525 $ 861 $ 56,934 $ 2,002 Troubled Debt Restructurings At September 30, 2017 and December 31, 2016 , there were $20.8 million and $16.4 million , respectively, in loans reported as troubled debt restructurings (“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 six -month performance requirement, however, it will remain classified as impaired. Generally, the Bank requires sustained performance for nine months before returning a TDR to accrual status. Modification of purchased-credit-impaired loans that are accounted for within loan pools in accordance with the accounting standards for purchased-credit-impaired 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 loans modified in a troubled debt restructuring by type of concession for the three and nine months ended September 30, 2017 and 2016 . There were no modifications that involved forgiveness of debt. Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Extensions of maturity 1 $ 60 — $ — Interest-rate reductions 3 122 10 533 Total 4 $ 182 10 $ 533 Nine Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Extensions of maturity 4 $ 6,263 3 $ 1,995 Interest-rate reductions 32 1,297 49 1,932 Total 36 $ 7,560 52 $ 3,927 The following table provides, by loan type, the number of loans modified in troubled debt restructurings, and the related recorded investment, during the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Commercial and industrial — $ — — $ — Manufactured housing 4 182 10 533 Residential real estate — — — — Total loans 4 $ 182 10 $ 533 Nine Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Commercial and industrial 3 $ 6,203 1 $ 76 Commercial real estate non-owner occupied — — 1 1,844 Manufactured housing 33 1,357 47 1,716 Residential real estate — — 3 291 Total loans 36 $ 7,560 52 $ 3,927 As of September 30, 2017 , except for one commercial and industrial loan with an outstanding commitment of $2.3 million , 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 loans have been modified in TDRs at December 31, 2016 . As of September 30, 2017 , ten manufactured housing loans totaling $0.5 million that were modified in TDRs within the past twelve months, defaulted on payments. As of September 30, 2016 , five manufactured housing loans totaling $0.1 million , that were modified in TDRs within the past twelve months, defaulted on payments. Loans modified in troubled debt restructurings 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. There was no allowance recorded as a result of TDR modifications during the three months ended September 30, 2017 . For the nine months ended September 30, 2017, there was one allowance recorded resulting from TDR modifications, totaling $1 thousand for one manufactured housing loan. There was one specific allowance totaling $29 thousand for one commercial real estate non-owner occupied loan resulting from TDR modifications during the three and nine months ended September 30, 2016 . Purchased Credit Impaired Loans The changes in accretable yield related to purchased-credit-impaired loans for the three and nine months ended September 30, 2017 and 2016 were as follows: Three Months Ended September 30, 2017 2016 (amounts in thousands) Accretable yield balance as of June 30, $ 9,006 $ 11,165 Accretion to interest income (368 ) (460 ) Reclassification from nonaccretable difference and disposals, net (276 ) 107 Accretable yield balance as of September 30, $ 8,362 $ 10,812 Nine Months Ended September 30, 2017 2016 (amounts in thousands) Accretable yield balance as of December 31, $ 10,202 $ 12,947 Accretion to interest income (1,326 ) (1,429 ) Reclassification from nonaccretable difference and disposals, net (514 ) (706 ) Accretable yield balance as of September 30, $ 8,362 $ 10,812 Allowance for Loan Losses and the FDIC Loss Sharing Receivable and Clawback Liability Losses incurred on covered 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 indemnification asset 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, the Bank 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 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 other real estate owned covered by the loss sharing agreements were recorded net of the estimated FDIC receivable as an increase to other real estate owned expense (a component of non-interest expense). 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 receipts from the FDIC as part of the December 31, 2015 and March 31, 2016 certifications. Consequently, loans and other real estate owned 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 loan losses and the FDIC loss sharing receivable, including the effects of the estimated clawback liability and the termination agreement, for the three and nine months ended September 30, 2017 and 2016 . Allowance for Loan Losses Three Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of June 30, $ 38,458 $ 38,097 Provision for loan losses (1) 2,352 88 Charge-offs (2,585 ) (666 ) Recoveries 89 378 Ending balance as of September 30, $ 38,314 $ 37,897 FDIC Loss Sharing Receivable/ Clawback Liability Three Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of June 30, $ — $ (1,381 ) Cash payments to the FDIC — 1,381 Ending balance as of September 30, $ — $ — (1) Provision for loan losses $ 2,352 $ 88 Net amount reported as provision for loan losses $ 2,352 $ 88 Allowance for Loan Losses Nine Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of December 31, $ 37,315 $ 35,647 Provision for loan losses (1) 5,937 3,143 Charge-offs (5,576 ) (1,848 ) Recoveries 638 955 Ending balance as of September 30, $ 38,314 $ 37,897 FDIC Loss Sharing Receivable/ Clawback Liability Nine Months Ended September 30, (amounts in thousands) 2017 2016 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 September 30, $ — $ — (1) Provision for loan losses $ 5,937 $ 3,143 (2) Effect attributable to FDIC loss share arrangements — (289 ) Net amount reported as provision for loan losses $ 5,937 $ 2,854 (a) Includes external costs, such as legal fees, real estate taxes, and appraisal expenses, which qualified for reimbursement under the FDIC loss sharing agreements. Credit Quality Indicators Multi-family, commercial and industrial, owner occupied commercial real estate, non-owner occupied commercial real estate, construction, and residential real estate 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. 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, construction and residential real estate classes, and for purposes of analyzing historical loss rates used in the determination of the allowance for loan losses for the respective loan portfolio class, 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 determined 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 Special Mention 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 classified Substandard 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 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 September 30, 2017 and December 31, 2016 . September 30, 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) Pass/Satisfactory $ 3,577,304 $ 1,080,797 $ 468,389 $ 1,212,945 $ 73,203 $ 431,364 $ — $ — $ 6,844,002 Special Mention 36,604 8,663 9,716 22,008 — — — — 76,991 Substandard 5,081 25,762 8,462 2,896 — 3,824 — — 46,025 Performing (1) — — — — — — 85,537 3,694 89,231 Non-performing (2) — — — — — — 7,401 125 7,526 Total $ 3,618,989 $ 1,115,222 $ 486,567 $ 1,237,849 $ 73,203 $ 435,188 $ 92,938 $ 3,819 $ 7,063,775 December 31, 2016 Multi-family Commercial Commercial Commercial Real Estate Non-Owner Occupied Construction Residential Manufactured Other Consumer Total (amounts in thousands) Pass/Satisfactory $ 3,198,290 $ 954,846 $ 375,919 $ 1,175,850 $ 50,291 $ 189,919 $ — $ — $ 5,945,115 Special Mention — 19,552 12,065 10,824 14,498 — — — 56,939 Substandard 16,709 14,313 5,648 7,041 — 3,583 — — 47,294 Performing (1) — — — — — — 92,920 3,413 96,333 Non-performing (2) — — — — — — 8,810 70 8,880 Total $ 3,214,999 $ 988,711 $ 393,632 $ 1,193,715 $ 64,789 $ 193,502 $ 101,730 $ 3,483 $ 6,154,561 (1) Includes consumer and other installment loans not subject to risk ratings. (2) Includes loans that are past due and still accruing interest and loans on nonaccrual status. Loan Purchases and Sales In first quarter 2017, Customers purchased $174.2 million of thirty -year fixed-rate residential mortgage loans from Florida-based Everbank. The purchase price was 98.5% of loans outstanding. In second quarter 2017, Customers purchased an additional $90.0 million of thirty -year fixed-rate residential mortgage loans from Everbank. The purchase price was 101.0% of loans outstanding. There were no loan purchases during the three months ended September 30, 2017 and during the three or nine months ended September 30, 2016. In first quarter 2017, Customers sold $94.9 million of multi-family loans for $95.4 million resulting in a gain on sale of $0.5 million and $8.7 million of Small Business Administration (SBA) loans resulting in a gain on sale of $0.8 million . In second quarter 2017, Customers sold $7.0 million of SBA loans resulting in a gain on sale of $0.6 million . In third quarter 2017, Customers sold $11.0 million of SBA loans resulting in a gain on sale of $1.1 million . In first quarter 2016, Customers sold $6.9 million of SBA loans resulting in a gain on sale of $0.6 million . In second quarter 2016, Customers sold one commercial loan amounting to $5.7 million resulting in a loss on sale of $0.1 million and $3.6 million of SBA loans resulting in a gain on sale of $0.4 million . There were no loan sales during the third quarter 2016. None of these purchases and sales during the nine months ended September 30, 2017 and 2016 materially affected the credit profile of Customers’ related loan portfolio. Loans Pledged as Collateral Customers has pledged eligible real estate loans as collateral for potential borrowings from the Federal Home Loan Bank of Pittsburgh ("FHLB") in the amount of $5.5 billion at September 30, 2017, compared to $4.8 billion at December 31, 2016.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Borrowings	BORROWINGS 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 after deducting the underwriting discount and estimated offering expenses were approximately $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.

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Regulatory Capital	REGULATORY CAPITAL The Bank and the Bancorp are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet the minimum capital requirements can result in certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on Customers' financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank and the Bancorp must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items, as calculated under the regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies. 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, total capital to risk-weighted assets, and Tier 1 capital to average assets (as defined in the regulations). At September 30, 2017 and December 31, 2016 , the Bank and the Bancorp satisfied all capital requirements to which they were subject. The Dodd-Frank Act required the Federal Reserve Bank to establish minimum consolidated capital requirements for bank holding companies that are as stringent as those required for insured depositary subsidiaries. In 2013, the federal banking agencies approved rules that implemented the Dodd-Frank requirements and certain other regulatory capital reforms effective January 1, 2015, that (i) introduced a new capital ratio pursuant to the prompt corrective action provisions, the common equity tier 1 capital to risk weighted assets ratio, (ii) increased the adequately capitalized and well capitalized thresholds for the Tier 1 risk based capital ratios to 6% and 8% , respectively, (iii) changed the treatment of certain capital components for determining Tier 1 and Tier 2 capital, and (iv) changed the risk weighting of certain assets and off-balance sheet items in determining risk weighted assets. Generally, to be considered adequately capitalized, or well capitalized, respectively, an institution must at least maintain the common equity Tier 1, Tier 1 and total risk based ratios and the Tier 1 leverage ratio in excess of the related minimum ratios as set forth in the following table: Actual For Capital Adequacy Purposes (Minimum Plus Capital Buffer) To Be Well Capitalized Under Prompt Corrective Action Provisions (amounts in thousands) Amount Ratio Amount Ratio Amount Ratio As of September 30, 2017: Common equity Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 677,976 8.284 % $ 470,603 5.750 % N/A N/A Customers Bank $ 1,009,380 12.342 % $ 470,242 5.750 % $ 531,578 6.500 % Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 895,447 10.941 % $ 593,369 7.250 % N/A N/A Customers Bank $ 1,009,380 12.342 % $ 592,914 7.250 % $ 654,250 8.000 % Total capital (to risk weighted assets) Customers Bancorp, Inc. $ 1,014,784 12.399 % $ 757,057 9.250 % N/A N/A Customers Bank $ 1,156,766 14.145 % $ 756,477 9.250 % $ 817,813 10.000 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 895,447 8.355 % $ 428,709 4.000 % N/A N/A Customers Bank $ 1,009,380 9.434 % $ 427,963 4.000 % $ 534,954 5.000 % As of December 31, 2016: Common equity Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 628,139 8.487 % $ 379,306 5.125 % N/A N/A Customers Bank $ 857,421 11.626 % $ 377,973 5.125 % $ 479,380 6.500 % Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 844,755 11.414 % $ 490,322 6.625 % N/A N/A Customers Bank $ 857,421 11.626 % $ 488,599 6.625 % $ 590,006 8.000 % Total capital (to risk weighted assets) Customers Bancorp, Inc. $ 966,097 13.053 % $ 638,343 8.625 % N/A N/A Customers Bank $ 1,003,609 13.608 % $ 636,101 8.625 % $ 737,508 10.000 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 844,755 9.067 % $ 372,652 4.000 % N/A N/A Customers Bank $ 857,421 9.233 % $ 371,466 4.000 % $ 464,333 5.000 % The 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." 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, 2017, 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 capital ratio of 5.750% ; (ii) a Tier 1 Risk based capital ratio of 7.250% ; and (iii) a Total Risk based capital ratio of 9.250% . Failure to maintain the required capital conservation buffer will result in limitations on capital distributions and on discretionary bonuses to executive officers.

Disclosures About Fair Value of

Disclosures About Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Disclosures About Fair Value of Financial Instruments	DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS Customers uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. ASC Topic 825, Financial Instruments , requires disclosure of the estimated fair value of an entity’s assets and liabilities considered to be financial instruments. For Customers, as for most financial institutions, the majority of its assets and liabilities are considered to be financial instruments. Many of these financial instruments lack an available trading market as characterized by a willing buyer and a willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under ASC Topic 820, Fair Value Measurements and Disclosures , as explained below. In accordance with ASC 820, the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for Customers' various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The fair value guidance provides a consistent definition of fair value, focusing on an exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. The fair value guidance also establishes a fair value hierarchy and describes the following three levels used to classify fair value measurements. Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require adjustments to inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The following methods and assumptions were used to estimate the fair values of Customers' financial instruments as of September 30, 2017 and December 31, 2016 : Cash and cash equivalents: The carrying amounts reported on the balance sheet for cash and cash equivalents approximate those assets’ fair values. These assets are classified as Level 1 fair values, based upon the lowest level of input that is significant to the fair value measurements. Investment securities: The fair values of investment securities available for sale 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. The carrying amount of investments in FHLB, Federal Reserve Bank, and other restricted stock approximates fair value, and considers the limited marketability of such securities. 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 held for sale - Consumer residential mortgage loans: The Bank 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 held for sale - Commercial mortgage warehouse loans: The fair value of 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 because 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 21 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. Loans held for sale - Multifamily loans: The fair values of multi-family loans held for sale are estimated using pricing indications from letters of intent with third party investors, recent sale transactions within the secondary markets for loans with similar characteristics, non-binding indicative bids from brokers, or estimates made by management considering current market rates and terms. These assets are included as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. Loans receivable, net of allowance for loan losses: The fair values of loans held for investment are estimated using discounted cash flows and market rates at the balance sheet date that reflect the credit and interest rate-risk inherent in the loans. Projected future cash flows are calculated based upon contractual maturity or call dates, projected repayments and prepayments of principal. Generally, for variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. These assets are classified as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. 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. Other real estate owned: The fair value of other real estate owned ("OREO") is determined by using appraisals, which may be discounted based on management’s review and changes in market conditions or sales agreements with third parties. All appraisals must be performed in accordance with the Uniform Standards of Professional Appraisal Practice. Appraisals are certified to the Bank and performed by appraisers on the Bank’s approved list of appraisers. Evaluations are completed by a person independent of management. The content of the appraisal depends on the complexity of the property. Appraisals are completed on a “retail value” and an “as is value”. These assets are classified as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. Deposit liabilities: The fair values disclosed for interest and non-interest bearing checking, passbook savings and money market deposit accounts are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). These liabilities are classified as Level 1 fair values, based upon the lowest level of input that is significant to the fair value measurements. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered in the market on certificates to a schedule of aggregated expected monthly maturities on time deposits. These liabilities are classified as Level 2 fair values, based upon the lowest level of input that is significant to the fair value measurements. Federal funds purchased: For these short-term instruments, the carrying amount is considered a reasonable estimate of fair value. These liabilities are classified as Level 1 fair values, based upon the lowest level of input that is significant to the fair value measurements. Borrowings: Borrowings consist of long-term and short-term FHLB advances, 5 -year senior unsecured notes, and subordinated debt. For overnight borrowings, the carrying amounts are considered reasonable estimates of fair value and are classified as Level 1 fair value measurements. Fair values of all other FHLB advances are estimated using discounted cash flow analysis, based on quoted prices for new FHLB advances with similar credit risk characteristics, terms and remaining maturity. The prices obtained from this active market represent a market value that is deemed to represent the transfer price if the liability were assumed by a third party. Fair values of privately placed subordinated and senior unsecured debt are estimated by a third-party financial adviser using discounted cash flow analysis, based on market rates currently offered on such debt with similar credit-risk characteristics, terms and remaining maturity. These liabilities are classified as Level 2 fair values, based upon the lowest level of input that is significant to the fair value measurements. The $63 million senior unsecured notes issued during third quarter 2013 are traded on The New York Stock Exchange, and their price can be obtained daily. This fair value measurement is classified as Level 1. 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 receipts and payments are based on expectations of future interest rates derived from observable market interest rate curves. In addition, fair value is adjusted for the effect of nonperformance risk by incorporating credit valuation adjustments for 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. Off-balance-sheet financial instruments: The fair values of unused commitments to lend and standby letters of credit are considered to be the same as their contractual amounts. 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 Customer’s disclosures and those of other companies may not be meaningful. The estimated fair values of Customers' financial instruments at September 30, 2017 and December 31, 2016 were as follows. BankMobile assets and liabilities previously reported as held for sale have been reclassified as held and used to conform with the current period presentation. Fair Value Measurements at September 30, 2017 Carrying Amount Estimated Fair Value 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 $ 219,480 $ 219,480 $ 219,480 $ — $ — Investment securities, available for sale 584,823 584,823 2,311 582,512 — Loans held for sale 2,113,293 2,113,473 — 1,963,076 150,397 Loans receivable, net of allowance for loan losses 7,023,024 7,020,487 — — 7,020,487 FHLB, Federal Reserve Bank and other restricted stock 98,611 98,611 — 98,611 — Derivatives 10,447 10,447 — 10,344 103 Liabilities: Deposits $ 7,597,076 $ 7,596,324 $ 5,296,636 $ 2,299,688 $ — Federal funds purchased 147,000 147,000 147,000 — — FHLB advances 1,462,343 1,462,245 727,343 734,902 — Other borrowings 186,258 194,157 65,704 128,453 — Subordinated debt 108,856 115,500 — 115,500 — Derivatives 12,092 12,092 — 12,092 — Fair Value Measurements at December 31, 2016 Carrying Amount Estimated Fair Value 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 $ 264,709 $ 264,709 $ 264,709 $ — $ — Investment securities, available for sale 493,474 493,474 15,246 478,228 — Loans held for sale 2,117,510 2,117,510 — 2,117,510 — Loans receivable, net of allowance for loan losses 6,117,322 6,162,020 — — 6,162,020 FHLB, Federal Reserve Bank and other restricted stock 68,408 68,408 — 68,408 — Derivatives 10,864 10,864 — 10,819 45 Liabilities: Deposits $ 7,303,775 $ 7,303,663 $ 4,472,013 $ 2,831,650 $ — Federal funds purchased 83,000 83,000 83,000 — — FHLB advances 868,800 869,049 688,800 180,249 — Other borrowings 87,123 91,761 66,261 25,500 — Subordinated debt 108,783 111,375 — 111,375 — Derivatives 14,172 14,172 — 14,172 — For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at September 30, 2017 and December 31, 2016 were as follows: September 30, 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 $ — $ 196,327 $ — $ 196,327 Agency guaranteed commercial mortgage-backed securities — 340,108 — 340,108 Corporate notes — 46,077 — 46,077 Equity securities 2,311 — — 2,311 Derivatives — 10,344 103 10,447 Loans held for sale – fair value option — 1,963,076 — 1,963,076 Total assets - recurring fair value measurements $ 2,311 $ 2,555,932 $ 103 $ 2,558,346 Liabilities Derivatives $ — $ 12,092 $ — $ 12,092 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of reserves of $1,527 $ — $ — $ 2,976 $ 2,976 Other real estate owned — — 782 782 Total assets - nonrecurring fair value measurements $ — $ — $ 3,758 $ 3,758 December 31, 2016 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 $ — $ 231,263 $ — $ 231,263 Agency-guaranteed commercial mortgage-backed securities — 201,817 — 201,817 Corporate notes — 45,148 — 45,148 Equity securities 15,246 — — 15,246 Derivatives — 10,819 45 10,864 Loans held for sale – fair value option — 2,117,510 — 2,117,510 Total assets - recurring fair value measurements $ 15,246 $ 2,606,557 $ 45 $ 2,621,848 Liabilities Derivatives $ — $ 14,172 $ — $ 14,172 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of reserves of $1,360 $ — $ — $ 6,527 $ 6,527 Other real estate owned — — 2,731 2,731 Total assets - nonrecurring fair value measurements $ — $ — $ 9,258 $ 9,258 The changes in Level 3 assets measured at fair value on a recurring basis for the three and nine months ended September 30, 2017 and 2016 are summarized as follows. Additional information about residential mortgage loan commitments can be found in NOTE 13 - DERIVATIVES INSTRUMENTS AND HEDGING ACTIVITIES. Residential Mortgage Loan Commitments Three Months Ended September 30, 2017 2016 (amounts in thousands) Balance at June 30 $ 102 $ 157 Issuances 103 85 Settlements (102 ) (157 ) Balance at September 30 $ 103 $ 85 Residential Mortgage Loan Commitments Nine Months Ended September 30, 2017 2016 (amounts in thousands) Balance at December 31 $ 45 $ 45 Issuances 300 315 Settlements (242 ) (275 ) Balance at September 30 $ 103 $ 85 Customers' policy is to recognize transfers between fair value levels when events or circumstances warrant transfers. There were no transfers between levels during the three and nine months ended September 30, 2017 and 2016 . The following table summarizes financial assets and financial liabilities measured at fair value as of September 30, 2017 and December 31, 2016 on a recurring and nonrecurring basis for which Customers utilized Level 3 inputs to measure fair value. Quantitative Information about Level 3 Fair Value Measurements September 30, 2017 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans $ 2,976 Collateral appraisal (1) Liquidation expenses (2) (8)% Other real estate owned 782 Collateral appraisal (1) Liquidation expenses (2) (8)% Residential mortgage loan commitments 103 Adjusted market bid Pull-through rate 90% Quantitative Information about Level 3 Fair Value Measurements December 31, 2016 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans $ 1,431 Collateral appraisal (1) Liquidation expenses (2) (8)% Impaired loans 5,096 Discounted cash flow Projected cash flows (3) 4 times EBITDA Other real estate owned 2,731 Collateral appraisal (1) Liquidation expenses (2) (8)% Residential mortgage loan commitments 45 Adjusted market bid Pull-through rate 90% (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. The Bank does not generally discount appraisals. (2) Fair value is adjusted for estimated costs to sell based on a percentage of the value as determined by the appraisal. (3) Projected cash flows of the business derived using EBITDA multiple based on management's best estimate. (4) Presented as a percentage of the value determined by appraisal for impaired loans and other real estate owned.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2017
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 value 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 primarily uses interest rate swaps as part of its interest-rate-risk management strategy. Interest-rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for Customers making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive income and is 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. The ineffective portion of the change in fair value of the derivatives is to be recognized directly in earnings. During the three and nine months ended September 30, 2017 and 2016 , Customers did not record any hedge ineffectiveness. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on Customers' variable-rate debt. Customers expects to reclassify $1.2 million from accumulated other comprehensive income 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 24 months (excluding forecasted transactions related to the payment of variable interest on existing financial instruments). At September 30, 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. At December 31, 2016 , Customers had four outstanding interest rate derivatives with notional amounts totaling $325.0 million that were designated as cash flow hedges of interest rate risk. The hedges expire between January 2018 and April 2019. 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. Because 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 September 30, 2017 , Customers had 76 interest rate swaps with an aggregate notional amount of $793.6 million related to this program. At December 31, 2016 , Customers had 76 interest rate swaps with an aggregate notional amount of $716.6 million related to this program. Customers enters into residential mortgage loan commitments in connection with its consumer mortgage banking activities to fund mortgage loans at specified rates and times in the future. These commitments are short-term in nature and generally expire in 30 to 60 days. The residential mortgage loan commitments that relate to the origination of mortgage loans that will be held for sale are considered derivative instruments under the applicable accounting guidance and are reported at fair value, with changes in fair value recorded directly in earnings. At September 30, 2017 and December 31, 2016 , Customers had an outstanding notional balance of residential mortgage loan commitments of $5.4 million and $3.6 million , respectively. Customers has also purchased and sold credit derivatives to either hedge or participate in the performance risk associated with some of its counterparties. These derivatives are not designated as hedging instruments and are reported at fair value, with changes in fair value reported directly in earnings. At September 30, 2017 and December 31, 2016 , Customers had outstanding notional balances of credit derivatives of $53.3 million and $44.9 million , respectively. Fair Value of Derivative Instruments on the Balance Sheet The following tables present the fair value of Customers' derivative financial instruments as well as their presentation on the balance sheet as of September 30, 2017 and December 31, 2016 . September 30, 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 $ 355 Other liabilities $ 2,001 Total $ 355 $ 2,001 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 9,861 Other liabilities $ 10,083 Credit contracts Other assets 128 Other liabilities 8 Residential mortgage loan commitments Other assets 103 Other liabilities — Total $ 10,092 $ 10,091 December 31, 2016 Derivative Assets Derivative Liabilities Balance Sheet Balance Sheet Location Fair Value Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 3,624 Total $ — $ 3,624 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 10,683 Other liabilities $ 10,537 Credit contracts Other assets 136 Other liabilities 11 Residential mortgage loan commitments Other assets 45 Other liabilities — Total $ 10,864 $ 10,548 Effect of Derivative Instruments on Comprehensive Income The following tables present the effect of Customers' derivative financial instruments on comprehensive income for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 91 Credit contracts Other non-interest income (6 ) Residential mortgage loan commitments Mortgage banking income 1 Total $ 86 Three Months Ended September 30, 2016 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 1,737 Credit contracts Other non-interest income (15 ) Residential mortgage loan commitments Mortgage banking income (71 ) Total $ 1,651 Nine Months Ended September 30, 2017 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 429 Credit contracts Other non-interest income (5 ) Residential mortgage loan commitments Mortgage banking income 58 Total $ 482 Nine Months Ended September 30, 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 $ 1,250 Credit contracts Other non-interest income 257 Residential mortgage loan commitments Mortgage banking income 41 Total $ 1,548 Three Months Ended September 30, 2017 Amount of Gain Recognized in OCI on Derivatives (Effective Portion) (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 104 Interest expense $ (572 ) Three Months Ended September 30, 2016 Amount of Gain Recognized in OCI on Derivatives (Effective Portion) (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 556 Interest expense $ (703 ) Nine Months Ended September 30, 2017 Amount of Loss Location of Gain (Loss) Amount of Loss (amounts in thousands) Derivative in cash flow hedging relationships: Interest rate swaps $ (115 ) Interest expense $ (2,166 ) Nine Months Ended September 30, 2016 Amount of Loss Location of Gain (Loss) Amount of Loss (amounts in thousands) Derivative in cash flow hedging relationships: Interest rate swaps $ (1,577 ) Interest expense $ (1,306 ) (1) Amounts presented are net of taxes. See NOTE 6 - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME for total effect on other comprehensive income from derivatives designated as cash flow hedges for the periods presented. Credit-risk-related Contingent Features By entering into derivative contracts, Customers is exposed to credit risk. The credit risk associated with derivatives executed with customers is the same as that involved in extending the related loans and is subject to the same standard credit policies. To mitigate the credit-risk exposure to major derivative dealer counterparties, Customers only enters into agreements with those counterparties that maintain credit ratings of high quality. Agreements with major derivative dealer counterparties contain provisions whereby default on any of Customers' indebtedness would be considered a default on its derivative obligations. Customers also has entered into agreements that contain provisions under which the counterparty could require Customers to settle its obligations if Customers fails to maintain its status as a well/adequately capitalized institution. As of September 30, 2017 , 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 $7.3 million . In addition, Customers has minimum collateral posting thresholds with certain of these counterparties and at September 30, 2017 had posted $8.3 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 September 30, 2017 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amount Financial Instruments Cash Collateral Received (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 4,190 $ — $ 4,190 $ — $ 1,900 $ 2,290 Offsetting of Financial Liabilities and Derivative Liabilities At September 30, 2017 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 8,400 $ — $ 8,400 $ — $ 8,262 $ 138 Offsetting of Financial Assets and Derivative Assets At December 31, 2016 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts Net Amount Financial Instruments Cash Collateral Received (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 4,723 $ — $ 4,723 $ — $ — $ 4,723 Offsetting of Financial Liabilities and Derivative Liabilities At December 31, 2016 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts Net Amount Financial Instruments Cash Collateral Pledged (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 9,825 $ — $ 9,825 $ — $ 4,472 $ 5,353

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS Customers has historically operated under one business segment, "Community Banking." However, beginning in third quarter 2016, Customers revised its segment financial reporting to reflect the manner in which its chief operating decision makers (our Chief Executive Officer and Board of Directors) have begun allocating resources and assessing performance subsequent to Customers' acquisition of the Disbursement business from Higher One and the combination of that business with the BankMobile technology platform late in second quarter 2016. Management has determined that Customers' operations consist of two reportable segments - Community 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 Community Business Banking segment is delivered predominately to commercial customers in Southeastern Pennsylvania, New York, New Jersey, Massachusetts, Rhode Island and New Hampshire 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, and commercial mortgage companies. 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 bank owned life insurance. The BankMobile segment provides state of the art high tech digital banking and disbursement services to consumers, students, and the "under banked" nationwide. BankMobile, as a division of Customers Bank, 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 a result of the Disbursement business acquisition. The following tables present the operating results for Customers' reportable business segments for the three and nine months ended September 30, 2017 and 2016. Customers has presented the financial information and disclosures for prior periods to reflect the segment disclosures as if they had been in effect for the periods presented. The segment financial results include directly attributable revenues and expenses. Corporate overhead costs are assigned to the Community Business Banking segment as those expenses are expected to continue following the planned spin-off of BankMobile. Similarly, the preferred stock dividends have been allocated in their entirety to the Community Business Banking segment. The tax benefit assigned to BankMobile was based on an estimated effective tax rate of 37.25% for 2017 and 38% for 2016. BankMobile, previously presented as discontinued operations in the financial statements due to Customers' stated intent to sell the business, was reclassified as held and used at September 30, 2017. As of September 30, 2017, Customers has decided to spin off BankMobile to Customers’ shareholders through a spin-off/merger transaction which is currently being negotiated. For more information on BankMobile's reclassification, see NOTE 3 - TAX-FREE SPIN-OFF AND MERGER. Three Months Ended September 30, 2017 Community Business Banking BankMobile Consolidated Interest income $ 95,585 $ 2,700 (1 ) $ 98,285 Interest expense 30,250 16 30,266 Net interest income 65,335 2,684 68,019 Provision for loan losses 1,874 478 2,352 Non-interest income 4,190 13,836 18,026 Non-interest expense 33,990 27,050 61,040 Income (loss) before income tax expense (benefit) 33,661 (11,008 ) 22,653 Income tax expense (benefit) 18,999 (4,100 ) 14,899 Net income (loss) 14,662 (6,908 ) 7,754 Preferred stock dividends 3,615 — 3,615 Net income (loss) available to common shareholders $ 11,047 $ (6,908 ) $ 4,139 Three Months Ended September 30, 2016 Community Business Banking BankMobile Consolidated Interest income $ 82,828 $ 1,384 (1 ) $ 84,212 Interest expense 19,620 7 19,627 Net interest income 63,208 1,377 64,585 Provision for loan losses (162 ) 250 88 Non-interest income 11,121 16,365 27,486 Non-interest expense 36,864 19,354 56,218 Income (loss) before income tax expense (benefit) 37,627 (1,862 ) 35,765 Income tax expense (benefit) 15,266 (708 ) 14,558 Net income (loss) 22,361 (1,154 ) 21,207 Preferred stock dividends 2,552 — 2,552 Net income (loss) available to common shareholders $ 19,809 $ (1,154 ) $ 18,655 (1) - Amounts reported include funds transfer pricing of $2.7 million and 1.4 million for the three months ended September 30, 2017 and 2016 , respectively, credited to BankMobile for the value provided to the Community Business Banking segment for the use of low/no cost deposits. Nine Months Ended September 30, 2017 Community Business Banking BankMobile Consolidated Interest income $ 265,524 $ 9,708 (1 ) $ 275,232 Interest expense 76,134 55 76,189 Net interest income 189,390 9,653 199,043 Provision for loan losses 5,459 478 5,937 Non-interest income 16,587 42,583 59,170 Non-interest expense 94,704 66,114 160,818 Income before income tax expense (benefit) 105,814 (14,356 ) 91,458 Income tax expense (benefit) 39,584 (5,348 ) 34,236 Net income (loss) 66,230 (9,008 ) 57,222 Preferred stock dividends 10,844 — 10,844 Net income (loss) available to common shareholders $ 55,386 $ (9,008 ) $ 46,378 As of September 30, 2017 Goodwill and other intangibles $ 3,632 $ 12,972 $ 16,604 Total assets $ 10,405,452 $ 66,377 (2 ) $ 10,471,829 Total deposits $ 6,815,994 $ 781,082 $ 7,597,076 Nine Months Ended September 30, 2016 Community Business Banking BankMobile Consolidated Interest income $ 234,513 $ 4,418 (1 ) $ 238,931 Interest expense 53,539 22 53,561 Net interest income 180,974 4,396 185,370 Provision for loan losses 2,605 249 2,854 Non-interest income 22,241 18,996 41,237 Non-interest expense 101,053 27,253 128,306 Income (loss) before income tax expense (benefit) 99,557 (4,110 ) 95,447 Income tax expense (benefit) 38,134 (1,562 ) 36,572 Net income (loss) 61,423 (2,548 ) 58,875 Preferred stock dividends 5,900 — 5,900 Net income (loss) available to common shareholders $ 55,523 $ (2,548 ) $ 52,975 As of September 30, 2016 Goodwill and other intangibles $ 3,642 $ 13,282 $ 16,924 Total assets $ 9,532,281 $ 70,329 (2 ) $ 9,602,610 Total deposits $ 6,855,788 $ 533,182 $ 7,388,970 (1) - Amounts reported include funds transfer pricing of $9.7 million and $4.4 million for the nine months ended September 30, 2017 and 2016 , respectively, credited to BankMobile for the value provided to the Community Business Banking segment for the use of low/no cost deposits. (2) - Amounts reported exclude intra company receivables.

Significant Accounting Polici23

Significant Accounting Policies and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The interim unaudited consolidated financial statements of Customers Bancorp and subsidiaries have been prepared pursuant to the rules and regulations of the SEC. These interim unaudited consolidated financial statements reflect all normal and recurring adjustments that are, in the opinion of management, necessary to present a fair statement of the financial position and the results of operations and cash flows of Customers Bancorp and subsidiaries for the interim periods presented. Certain information and footnote disclosures normally included in the annual consolidated financial statements have been omitted from these interim unaudited consolidated financial statements as permitted by SEC rules and regulations. The December 31, 2016 consolidated balance sheet presented in this report has been derived from Customers Bancorp’s audited 2016 consolidated financial statements. Management believes that the disclosures are adequate to present fairly the consolidated financial statements as of the dates and for the periods presented. These interim unaudited consolidated financial statements should be read in conjunction with the 2016 consolidated financial statements of Customers Bancorp and subsidiaries included in Customers' Annual Report on Form 10-K for the year ended December 31, 2016 filed with the SEC on March 8, 2017 . That Form 10-K describes Customers Bancorp’s significant accounting policies, which include its policies on Principles of Consolidation; Cash and Cash Equivalents and Statements of Cash Flows; Restrictions on Cash and Amounts due from Banks; Business Combinations; Investment Securities; Loan Accounting Framework; Allowance for Loan Losses; Goodwill and other Intangible Assets; Investments in FHLB, Federal Reserve Bank, and other restricted stock; Other Real Estate Owned; FDIC Loss Sharing Receivable and Clawback Liability; Bank-Owned Life Insurance; Bank Premises and Equipment; Treasury Stock; Income Taxes; Share-Based Compensation; Segments; Derivative Instruments and Hedging; Comprehensive Income; and Earnings per Share. Certain prior period amounts have been reclassified to conform to the current period presentation. Results for interim periods are not necessarily indicative of those that may be expected for the fiscal year.
Reclassifications	Reclassifications As described in NOTE 3 - TAX-FREE SPIN-OFF AND MERGER, as of September 30, 2017 , Customers reclassified BankMobile, a segment previously classified as held for sale to held and used, as it no longer met the held-for-sale criteria. Certain prior period amounts and note disclosures (including NOTE 9 and NOTE 12 ) have been reclassified to conform with the current period presentation. Except for these reclassifications, there have been no material changes to Customers' significant accounting policies as disclosed in Customers' Annual Report on Form 10-K for the year ended December 31, 2016 . Presented below are recently issued accounting standards that Customers has adopted as well as those that the Financial Accounting Standards Board (“FASB”) has issued but are not yet effective or that Customers has not yet adopted.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Accounting Standards Adopted in 2017 Since January 1, 2017, Customers has adopted the following FASB Accounting Standard Updates (“ASUs”), none of which had a material impact to Customers’ consolidated financial statements: • Customers adopted ASU 2016-05, Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, on a prospective basis. This ASU clarifies that a change in the counterparties to a derivative contract (i.e., a novation), in and of itself, does not require the de-designation of a hedging relationship provided that all the other hedge accounting criteria continue to be met. • Customers also adopted ASU 2016-06, Contingent Put and Call Options in Debt Instruments . This ASU clarifies that a contingency of put or call exercise does not need to be evaluated to determine whether it relates to interest rates and credit risk in an embedded derivative analysis of hybrid financial instruments. In other words, a contingent put or call option embedded in a debt instrument would be evaluated for possible separate accounting as a derivative instrument without regard to the nature of the exercise contingency. However, as required under the existing guidance, companies will still need to evaluate the other relevant embedded derivative guidance, such as whether the payoff from the contingent put or call option is adjusted based on changes in an index other than interest rates or credit risk, and whether the debt involves a substantial premium or discount. As the adoption did not result in any significant impact to Customers’ consolidated financial statements, it did not result in a modified retrospective application. • Customers also adopted ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting, on a prospective basis. This ASU eliminates the requirement for the retrospective use of the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence of an investor. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for the equity method of accounting. • Customers also adopted ASU 2016-17, Consolidation - Interests Held Through Related Parties that are Under Common Control . This ASU amends the guidance included in ASU 2015-02, Consolidation: Amendments to Consolidation Analysis which Customers adopted in first quarter 2016. This ASU makes a narrow amendment that requires that a single decision maker considers indirect economic interests in an entity held through related parties that are under common control on a proportionate basis when determining whether it is the primary beneficiary of that VIE. Prior to this amendment, indirect interests held through related parties that are under common control were to be considered equivalent of the single decision maker’s direct interests in their entirety which could result in a single decision maker consolidating the VIE. As the adoption did not result in any significant impact to Customers’ consolidated financial statements, it did not result in a full or modified retrospective application. Accounting Standards Issued But Not Yet Adopted In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities , which 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. The guidance 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 as the hedged item. The guidance also changes certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. This ASU is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption permitted. Customers plans to adopt this ASU by January 1, 2018. Adoption of this new guidance must be applied on a modified retrospective approach. While Customers continues to assess all potential impacts of the standard, Customers does not currently expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In July 2017, the FASB issued ASU 2017-11, Accounting for Certain Financial Instruments with Down Round Features , which will change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. 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. 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 income available to common shareholders in basic earnings per share ("EPS"). For public business entities, the amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Customers currently does not have any equity-linked financial instruments (or embedded features) with down round features, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting , which clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification in Accounting Standards Codification (“ASC”) 718. Under this ASU, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award as equity or a liability changes as a result of the change in terms or conditions. This ASU does not change the accounting for modifications under ASC 718. The ASU will be effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Adoption of this new guidance must be applied prospectively to an award modified on or after the adoption date. Customers generally does not modify the terms of conditions of its share-based payment awards, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities, which requires that premiums for certain callable debt securities held be amortized to their earliest call date. This ASU does not affect the accounting for securities purchased at a discount. This ASU will be effective for Customers for its first reporting period beginning after December 15, 2018, with earlier adoption permitted. Adoption of this new guidance must be applied on a modified retrospective approach. Customers currently has an immaterial amount of callable debt securities purchased with premiums, accordingly Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements, however, Customers will continue to evaluate the potential impact through the adoption date. In February 2017, the FASB issued ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which clarifies the scope and application of the accounting guidance on the sale of nonfinancial assets to non-customers, including partial sales. This ASU defines an in-substance nonfinancial asset, in part, as a financial asset promised to a counterparty in a contract if substantially all of the fair value of the assets (recognized and unrecognized) that are promised to the counterparty in the contract is concentrated in nonfinancial assets. 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. This ASU also unifies the guidance related to partial sales of nonfinancial assets, eliminates rules specifically addressing the sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. This ASU will be effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. The adoption of this new guidance must be applied on a full or modified retrospective basis. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment , which will simplify the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test that requires an entity to determine the implied fair value of its goodwill through a hypothetical purchase price allocation. Instead, under this ASU, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. All other goodwill impairment guidance will remain largely unchanged. The same one-step impairment test will be applied to goodwill at all reporting units, even those with zero or negative carrying amounts. Entities will also be required to disclose the amount of goodwill at reporting units with zero or negative carrying amounts. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. This ASU is effective for Customers for its first reporting period beginning after December 15, 2019. Early adoption is permitted for impairment tests performed after January 1, 2017. Customers expects to early adopt this ASU upon its next annual goodwill impairment test in 2017 and does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business , which 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. In addition, 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. Also, the amendments narrow the definition of the term “output” so that it is consistent with how outputs are defined in ASC Topic 606, Revenue from Contracts with Customers . This ASU is effective for Customers for its first reporting period beginning after December 15, 2017. Adoption of this new guidance must be applied on a prospective basis. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash , which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers does not expect the adoption to this ASU to have a significant impact on the presentation of its statement of cash flows. In October 2016, the FASB issued ASU 2016-16- Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory , which requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This 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. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments , which aims to reduce the existing diversity in practice with regards to the following specific items in the Statement of Cash Flows: 1. Cash payments for debt prepayment or extinguishment costs will be classified in financing activities. 2. Upon settlement of zero-coupon bonds and bonds with insignificant cash coupons, the portion of the payment attributable to imputed interest will be classified as an operating activity, while the portion of the payment attributable to principal will be classified as a financing activity. 3. Cash paid by an acquirer soon after a business combination (i.e. approximately three months or less) for the settlement of a contingent consideration liability will be classified in investing activities. Payments made thereafter should be separated between financing activities and operating activities. Cash payments up to the amount of the contingent consideration liability recognized at the acquisition date will be classified in financing activities; any excess will be classified in operating activities. 4. 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). Cash proceeds from lump-sum settlements will be classified based on the nature of each loss component included in the settlement. 5. Cash proceeds received from the settlement of bank-owned life insurance (BOLI) policies will be classified as cash inflows from investing activities. Cash payments for premiums on BOLI may be classified as cash outflows for investing, operating, or a combination of both. 6. 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. 7. Distributions received from equity method investees will be classified using either a cumulative earnings approach or a look-through approach as an accounting policy election. The ASU contains additional guidance clarifying when an entity should separate cash receipts and cash payments and classify them into more than one class of cash flows (including when reasonable judgment is required to estimate and allocate cash flows) versus when an entity should classify the aggregate amount into one class of cash flows on the basis of predominance. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017, with early adoption permitted. Customers is currently evaluating the impact of this ASU and does not expect the ASU to have a material impact on the presentation of its statement of cash flows. In June 2016, the FASB issued ASU 2016-13 , Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") 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. This ASU will replace today’s “incurred loss” approach. The CECL model is expected to result in earlier recognition of credit losses. 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. It also simplifies the accounting model for purchased credit-impaired debt securities and loans. This ASU is effective for Customers for its first reporting period beginning after December 15, 2019. Earlier adoption is also permitted. Adoption of the new guidance 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. Customers is currently evaluating the impact of this ASU, initiating implementation efforts across the company, and planning for loss modeling requirements consistent with lifetime expected loss estimates. It is expected that the new model 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. 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. Customers currently does not intend to early adopt this new guidance. In March 2016, the FASB issued ASU 2016-04, Liabilities - Extinguishments of Liabilities: Recognition of Breakage for Certain Prepaid Stored-Value Products , that would require issuers of prepaid stored-value product (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. There is currently a diversity in the methodology used to recognize breakage. Subtopic 405-20, Extinguishment of Liabilities , includes derecognition guidance for both financial liabilities and nonfinancial liabilities, and Topic 606, Revenue from Contracts with Customers , includes authoritative breakage guidance but excludes financial liabilities. 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. This ASU is effective for Customers for its first reporting period beginning after December 15, 2017. Customers does not expect the adoption of this ASU to have a significant impact on its financial condition, results of operations and consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases , which supersedes the current lease accounting guidance for both lessees and lessors under ASC 840, Leases . From the lessee's perspective, the new standard establishes a right-of-use (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. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement for lessees. The new guidance 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. The new standard is effective for Customers for its first reporting period beginning after December 15, 2018. Early adoption is permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. A modified retrospective transition approach is required for lessors for sales-type, direct financing, and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. Customers is currently evaluating the impact of this ASU on its financial condition and results of operations and expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. Customers does not intend to early adopt this ASU. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance in this ASU among other things, (1) requires equity investments with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (3) 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, (4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (5) requires an entity to present separately in other comprehensive income 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, (6) 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 and (7) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities. The guidance in this ASU is effective for Customers for its first reporting period beginning after December 15, 2017, including interim periods within those fiscal years. Customers is in the process of evaluating the impacts of the adoption of this ASU, however, it does not expect the impact to be significant to its financial condition, results of operations and consolidated financial statements given the immaterial amount of its investment in equity securities. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , superseding the revenue recognition requirements in ASC 605. This ASU 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. The amendment includes a five-step process to assist an entity in achieving the main principle(s) of revenue recognition under ASC 605. In August 2015, the FASB issued ASU 2015-14, which formalized the deferral of the effective date of the amendment for a period of one-year from the original effective date. Following the issuance of ASU 2015-14, the amendment will be effective for Customers for its first reporting period beginning after December 15, 2017. In March 2016, the FASB also issued ASU 2016-08, an amendment to the guidance in ASU 2014-09, which 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. ASU 2016-08 also eliminated two of the indicators (the entity’s consideration is in the form of a commission and the entity is not exposed to credit risk) in making that determination. This amendment also clarifies that each indicator may be more or less relevant to the assessment depending on the terms and conditions of the contract. In April 2016, the FASB also issued ASU 2016-10, which clarifies the implementation guidance on identifying promised goods or services and on determining whether an entity's promise to grant a license with either a right to use the entity's intellectual property (which is satisfied at a point in time) or a right to access the entity's intellectual property (which is satisfied over time). In May 2016, the FASB issued ASU 2016-12, an amendment to ASU 2014-09, which provided practical expedients related to disclosures of remaining performance obligations, as well as other amendments to guidance on transition, collectability, non-cash consideration and the presentation of sales and other similar taxes. The amendments, collectively, should be applied retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Because the ASU does not apply to revenue associated with leases and financial instruments (including loans and securities), Customers current assessment is that the new guidance will 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 gain). Customers will adopt this ASU on January 1, 2018 using a modified retrospective approach. Customers has completed its identification of all revenue streams that are included in its financial statements and has identified its deposit related fees, service charges, debit card and prepaid card interchange income, and university fees to be within the scope of the standard. Customers is also substantially complete with its review of the related contracts and has also completed its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross vs. net). Customers' overall assessment suggests that adoption of this ASU will not materially change its current method and timing of recognizing revenue for these revenue streams. Customers, however, is still evaluating the ASU’s expanded disclosure requirements. As provided above, Customers current assessment is that the adoption of this ASU will not have a significant impact to its financial condition, results of operations and consolidated financial statements.
Fair Value Measurement	Customers uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. ASC Topic 825, Financial Instruments , requires disclosure of the estimated fair value of an entity’s assets and liabilities considered to be financial instruments. For Customers, as for most financial institutions, the majority of its assets and liabilities are considered to be financial instruments. Many of these financial instruments lack an available trading market as characterized by a willing buyer and a willing seller engaging in an exchange transaction. For fair value disclosure purposes, Customers utilized certain fair value measurement criteria under ASC Topic 820, Fair Value Measurements and Disclosures , as explained below. In accordance with ASC 820, the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for Customers' various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The fair value guidance provides a consistent definition of fair value, focusing on an exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. The fair value guidance also establishes a fair value hierarchy and describes the following three levels used to classify fair value measurements. Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require adjustments to inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Impaired Loans	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.
Derivatives	Risk Management Objectives of Using Derivatives Customers is exposed to certain risks arising from both its business operations and economic conditions. Customers manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and durations of its assets and liabilities. Specifically, Customers enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value 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 primarily uses interest rate swaps as part of its interest-rate-risk management strategy. Interest-rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for Customers making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive income and is 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. The ineffective portion of the change in fair value of the derivatives is to be recognized directly in earnings.

Acquisition Activity (Tables)

Acquisition Activity (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Amounts Recorded on the Balance Sheet	The following table summarizes the final adjusted amounts recognized for assets acquired and liabilities assumed: (amounts in thousands) Fair value of assets acquired: Developed software $ 27,400 Other intangible assets 9,300 Accounts receivable 2,784 Prepaid expenses 418 Fixed assets, net 229 Total assets acquired 40,131 Fair value of liabilities assumed: Other liabilities 5,735 Deferred revenue 2,655 Total liabilities assumed 8,390 Net assets acquired $ 31,741 Transaction cash consideration (1) $ 37,000 Goodwill recognized $ 5,259 (1) Includes $10 million payable to Higher One upon each of the first and second anniversary of the transaction closing, which has been placed into an escrow account with a third party (aggregate amount of $20 million at December 31, 2016). Customers paid the first $10 million due to Higher One in June 2017.

Tax-Free Spin-Off and Merger (T

Tax-Free Spin-Off and Merger (Tables)	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations Income Statement and Balance Sheet	The following summarizes the effect of the reclassification from held for sale classification to held and used classification on the previously reported consolidated balance sheet as of December 31, 2016 and the previously reported consolidated statements of income for the the three and nine months ended September 30, 2016: December 31, 2016 As Previously Reported Effect of Reclassification From Held For Sale to Held and Used December 31, 2016 After Reclassification (amounts in thousands) ASSETS Cash and cash equivalents $ 244,709 $ 20,000 $ 264,709 Loans receivable 6,142,390 12,247 6,154,637 Bank premises and equipment, net 12,259 510 12,769 Goodwill and other intangibles 3,639 13,982 17,621 Assets held for sale 79,271 (79,271 ) — Other assets 70,099 32,532 102,631 LIABILITIES Demand, non-interest bearing deposits $ 512,664 $ 453,394 $ 966,058 Interest bearing deposits 6,334,316 3,401 6,337,717 Non-interest bearing deposits held for sale 453,394 (453,394 ) — Other liabilities held for sale 31,403 (31,403 ) — Accrued interest payable and other liabilities 47,381 28,002 75,383 Three Months Ended September 30, 2016 Effect of Reclassification From Held For Sale to Held and Used Three Months Ended September 30, 2016 As Previously Reported After Reclassification Interest income $ 84,212 $ — $ 84,212 Interest expense 19,622 5 19,627 Net interest income 64,590 (5 ) 64,585 Provision for loan losses (161 ) 249 88 Non-interest income 11,121 16,365 27,486 Non-interest expenses 36,750 19,468 56,218 Income from continuing operations before income taxes 39,122 (3,357 ) 35,765 Provision for income taxes 15,834 (1,276 ) 14,558 Net income from continuing operations 23,288 (2,081 ) 21,207 Loss from discontinued operations before income taxes (3,357 ) 3,357 — Income tax benefit from discontinued operations (1,276 ) 1,276 — Net loss from discontinued operations (2,081 ) 2,081 — Net income 21,207 — 21,207 Preferred stock dividend 2,552 — 2,552 Net income available to common shareholders $ 18,655 $ — $ 18,655 Nine Months Ended September 30, 2016 Effect of Reclassification From Held For Sale to Held and Used Nine Months Ended September 30, 2016 As Previously Reported After Reclassification Interest income $ 238,931 $ — $ 238,931 Interest expense 53,548 13 53,561 Net interest income 185,383 (13 ) 185,370 Provision for loan losses 2,605 249 2,854 Non-interest income 22,241 18,996 41,237 Non-interest expenses 100,706 27,600 128,306 Income from continuing operations before income taxes 104,313 (8,866 ) 95,447 Provision for income taxes 39,942 (3,370 ) 36,572 Net income from continuing operations 64,371 (5,496 ) 58,875 Loss from discontinued operations before income taxes (8,865 ) 8,865 — Income tax benefit from discontinued operations (3,369 ) 3,369 — Net loss from discontinued operations (5,496 ) 5,496 — Net income 58,875 — 58,875 Preferred stock dividend 5,900 — 5,900 Net income available to common shareholders $ 52,975 $ — $ 52,975

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
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. Three Months Ended Nine Months Ended 2017 2016 2017 2016 (amounts in thousands, except share and per share data) Net income available to common shareholders $ 4,139 $ 18,655 $ 46,378 $ 52,975 Weighted-average number of common shares outstanding - basic 30,739,671 27,367,551 30,597,314 27,131,960 Share-based compensation plans 1,754,480 2,205,291 2,004,917 2,119,717 Warrants 18,541 124,365 24,392 243,531 Weighted-average number of common shares - diluted 32,512,692 29,697,207 32,626,623 29,495,208 Basic earnings per common share $ 0.13 $ 0.68 $ 1.52 $ 1.95 Diluted earnings per common share $ 0.13 $ 0.63 $ 1.42 $ 1.80
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 to do so would have been anti-dilutive for the periods presented. Three Months Ended Nine Months Ended 2017 2016 2017 2016 Anti-dilutive securities: Share-based compensation awards 409,225 616,995 409,225 616,995 Warrants 52,242 52,242 52,242 52,242 Total anti-dilutive securities 461,467 669,237 461,467 669,237

Changes in Accumulated Other 27

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (loss)	The following tables present the changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 (amounts in thousands) Unrealized Gains (Losses) on Available-For-Sale Securities Unrealized Total Balance - June 30, 2017 $ 6,822 $ (1,458 ) $ 5,364 Other comprehensive income (loss) before reclassifications (2,177 ) 104 (2,073 ) Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (3,263 ) 349 (2,914 ) Net current-period other comprehensive (loss) income (5,440 ) 453 (4,987 ) Balance - September 30, 2017 $ 1,382 $ (1,005 ) $ 377 Nine Months Ended September 30, 2017 (amounts in thousands) Unrealized Gains (Losses) on Available-For-Sale Securities Unrealized Total Balance - December 31, 2016 $ (2,681 ) $ (2,211 ) $ (4,892 ) Other comprehensive income (loss) before reclassifications 9,268 (115 ) 9,153 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (5,205 ) 1,321 (3,884 ) Net current-period other comprehensive income 4,063 1,206 5,269 Balance - September 30, 2017 $ 1,382 $ (1,005 ) $ 377 (1) All amounts are presented net of tax. Amounts in parentheses indicate reductions to accumulated other comprehensive income. (2) Reclassification amounts for available-for-sale securities are reported as gain on sale of investment securities on the consolidated statements of income. Reclassification amounts for cash flow hedges are reported as interest expense on FHLB advances on the consolidated statements of income. Three Months Ended September 30, 2016 Available-for-sale-securities (amounts in thousands) Unrealized Gains Foreign Currency Items Total Unrealized Gains Unrealized Loss on Cash Flow Hedge Total Balance - June 30, 2016 $ 4,895 $ (768 ) $ 4,127 $ (4,554 ) $ (427 ) Other comprehensive income (loss) before reclassifications 15 190 205 556 761 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) 1 — 1 439 440 Net current-period other comprehensive income 16 190 206 995 1,201 Balance - September 30, 2016 $ 4,911 $ (578 ) $ 4,333 $ (3,559 ) $ 774 Nine Months Ended September 30, 2016 Available-for-sale-securities (amounts in thousands) Unrealized Gains (Losses) Foreign Currency Items Total Unrealized Gains (Losses) Unrealized Loss on Cash Flow Hedge Total Balance - December 31, 2015 $ (4,602 ) $ (584 ) $ (5,186 ) $ (2,798 ) $ (7,984 ) Other comprehensive income (loss) before reclassifications 9,529 6 9,535 (1,577 ) 7,958 Amounts reclassified from accumulated other comprehensive income (loss) to net income (2) (16 ) — (16 ) 816 800 Net current-period other comprehensive income (loss) 9,513 6 9,519 (761 ) 8,758 Balance - September 30, 2016 $ 4,911 $ (578 ) $ 4,333 $ (3,559 ) $ 774 (1) All amounts are presented net of tax. Amounts in parentheses indicate reductions to accumulated other comprehensive income. (2) Reclassification amounts for available-for-sale securities are reported as gain (loss) on sale of investment securities on the consolidated statements of income. Reclassification amounts for cash flow hedges are reported as interest expense on FHLB advances on the consolidated statements of income.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 are summarized in the tables below: September 30, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available for Sale: Agency-guaranteed residential mortgage-backed securities $ 197,606 $ 521 $ (1,800 ) $ 196,327 Agency-guaranteed commercial real estate mortgage-backed securities 337,683 2,843 (418 ) 340,108 Corporate notes (1) 44,958 1,119 — 46,077 Equity securities (2) 2,311 — — 2,311 $ 582,558 $ 4,483 $ (2,218 ) $ 584,823 (1) Includes subordinated debt issued by other bank holding companies. (2) Includes equity securities issued by a foreign entity. December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (amounts in thousands) Available for Sale: Agency-guaranteed residential mortgage-backed securities $ 233,002 $ 918 $ (2,657 ) $ 231,263 Agency-guaranteed commercial real estate mortgage-backed securities 204,689 — (2,872 ) 201,817 Corporate notes (1) 44,932 401 (185 ) 45,148 Equity securities (2) 15,246 — — 15,246 $ 497,869 $ 1,319 $ (5,714 ) $ 493,474 (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 presents proceeds from the sale of available-for-sale investment securities and gross gains and gross losses realized on those sales for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (amounts in thousands) Proceeds from sale of available-for-sale securities $ 554,540 $ 5 $ 698,451 $ 2,853 Gross gains $ 5,349 $ — $ 8,532 $ 26 Gross losses — (1 ) — (1 ) Net gains (losses) $ 5,349 $ (1 ) $ 8,532 $ 25
Summary of Available-for-Sale Debt Securities by Stated Maturity	The following table presents 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, therefore, these debt securities are classified separately with no specific maturity date: September 30, 2017 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 42,958 43,854 Due after ten years 2,000 2,223 Agency-guaranteed residential mortgage-backed securities 197,606 196,327 Agency-guaranteed commercial real estate mortgage-backed securities 337,683 340,108 Total debt securities $ 580,247 $ 582,512
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category	Gross unrealized losses and fair value of Customers' investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2017 and December 31, 2016 were as follows: September 30, 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: Agency-guaranteed residential mortgage-backed securities $ 54,525 $ (279 ) $ 45,682 $ (1,521 ) $ 100,207 $ (1,800 ) Agency-guaranteed commercial real estate mortgage-backed securities 105,044 (418 ) — — 105,044 (418 ) Total $ 159,569 $ (697 ) $ 45,682 $ (1,521 ) $ 205,251 $ (2,218 ) December 31, 2016 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: Agency-guaranteed residential mortgage-backed securities $ 87,433 $ (1,330 ) $ 30,592 $ (1,327 ) $ 118,025 $ (2,657 ) Agency-guaranteed commercial real estate mortgage-backed securities 201,817 (2,872 ) — — 201,817 (2,872 ) Corporate notes (1) 9,747 (185 ) — — 9,747 (185 ) Total $ 298,997 $ (4,387 ) $ 30,592 $ (1,327 ) $ 329,589 $ (5,714 ) (1) Includes subordinated debt issued by other bank holding companies.

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables Held-for-sale [Abstract]
Composition of Loans Held for Sale	The composition of loans held for sale as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 (amounts in thousands) Commercial loans: Mortgage warehouse loans, at fair value $ 1,961,248 $ 2,116,815 Multi-family loans at lower of cost or fair value 150,217 — Total commercial loans held for sale 2,111,465 2,116,815 Consumer loans: Residential mortgage loans, at fair value 1,828 695 Loans held for sale $ 2,113,293 $ 2,117,510

Loans Receivable and Allowanc30

Loans Receivable and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of Loans Receivable	The following table presents loans receivable as of September 30, 2017 and December 31, 2016 . BankMobile loans receivable previously reported as held for sale have been reclassified as held and used to conform with the current period presentation. September 30, 2017 December 31, 2016 (amounts in thousands) Commercial: Multi-family $ 3,618,989 $ 3,214,999 Commercial and industrial (including owner occupied commercial real estate) 1,601,789 1,382,343 Commercial real estate non-owner occupied 1,237,849 1,193,715 Construction 73,203 64,789 Total commercial loans 6,531,830 5,855,846 Consumer: Residential real estate 435,188 193,502 Manufactured housing 92,938 101,730 Other 3,819 3,483 Total consumer loans 531,945 298,715 Total loans receivable 7,063,775 6,154,561 Deferred (fees)/costs and unamortized (discounts)/premiums, net (2,437 ) 76 Allowance for loan losses (38,314 ) (37,315 ) Loans receivable, net of allowance for loan losses $ 7,023,024 $ 6,117,322
Loans Receivable by Loan Type and Performance Status	The following tables summarize loans receivable by loan type and performance status as of September 30, 2017 and December 31, 2016 : September 30, 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 $ — $ — $ — $ — $ 3,617,062 $ 1,927 $ 3,618,989 Commercial and industrial — — — 20,423 1,093,997 802 1,115,222 Commercial real estate - owner occupied — — — 2,949 472,832 10,786 486,567 Commercial real estate - non-owner occupied — — — 184 1,232,212 5,453 1,237,849 Construction — — — — 73,203 — 73,203 Residential real estate 1,607 — 1,607 4,269 423,551 5,761 435,188 Manufactured housing (5) 2,937 2,505 5,442 1,959 82,896 2,641 92,938 Other consumer 67 — 67 58 3,474 220 3,819 Total $ 4,611 $ 2,505 $ 7,116 $ 29,842 $ 6,999,227 $ 27,590 $ 7,063,775 December 31, 2016 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 $ 12,573 $ — $ 12,573 $ — $ 3,200,322 $ 2,104 $ 3,214,999 Commercial and industrial 350 — 350 8,443 978,881 1,037 988,711 Commercial real estate - owner occupied 137 — 137 2,039 379,227 12,229 393,632 Commercial real estate - non-owner occupied — — — 2,057 1,185,331 6,327 1,193,715 Construction — — — — 64,789 — 64,789 Residential real estate 4,417 — 4,417 2,959 178,559 7,567 193,502 Manufactured housing (5) 3,761 2,813 6,574 2,236 89,850 3,070 101,730 Other consumer 12 — 12 58 3,177 236 3,483 Total $ 21,250 $ 2,813 $ 24,063 $ 17,792 $ 6,080,136 $ 32,570 $ 6,154,561 (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. Because of 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 subject to 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 three and nine months ended September 30, 2017 and 2016 and the loans and allowance for loan losses by loan class based on impairment evaluation method as of September 30, 2017 and December 31, 2016 were as follows. The amounts presented for the provision for loan losses below do not include the effect of changes to estimated benefits resulting from the FDIC loss share arrangements for the covered loans for periods prior to the termination of the FDIC loss sharing arrangements. Three Months Ended September 30, 2017 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Construction Residential Manufactured Other Consumer Total (amounts in thousands) Ending Balance, June 30, 2017 $ 12,028 $ 11,585 $ 2,976 $ 7,786 $ 716 $ 2,995 $ 268 $ 104 $ 38,458 Charge-offs — (2,032 ) — (77 ) — (120 ) — (356 ) (2,585 ) Recoveries — 54 — — 27 7 — 1 89 Provision for loan losses 668 966 262 (53 ) 104 72 (77 ) 410 2,352 Ending Balance, September 30, 2017 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 Nine Months Ended September 30, 2017 Ending Balance, December 31, 2016 $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315 Charge-offs — (4,079 ) — (485 ) — (410 ) — (602 ) (5,576 ) Recoveries — 337 9 — 157 34 — 101 638 Provision for loan losses 1,094 3,265 1,046 247 (150 ) (12 ) (95 ) 542 5,937 Ending Balance, September 30, 2017 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 As of September 30, 2017 Loans: Individually evaluated for impairment $ — $ 20,493 $ 2,950 $ 184 $ — $ 8,178 $ 10,340 $ 56 $ 42,201 Collectively evaluated for impairment 3,617,062 1,093,927 472,831 1,232,212 73,203 421,249 79,957 3,543 6,993,984 Loans acquired with credit deterioration 1,927 802 10,786 5,453 — 5,761 2,641 220 27,590 $ 3,618,989 $ 1,115,222 $ 486,567 $ 1,237,849 $ 73,203 $ 435,188 $ 92,938 $ 3,819 $ 7,063,775 Allowance for loan losses: Individually evaluated for impairment $ — $ 625 $ 740 $ — $ — $ 142 $ 5 $ 15 $ 1,527 Collectively evaluated for impairment 12,696 9,462 2,481 4,732 847 2,222 83 93 32,616 Loans acquired with credit deterioration — 486 17 2,924 — 590 103 51 4,171 $ 12,696 $ 10,573 $ 3,238 $ 7,656 $ 847 $ 2,954 $ 191 $ 159 $ 38,314 Three Months Ended September 30, 2016 Multi-family Commercial and Industrial Commercial Real Estate Owner Occupied Commercial Construction Residential Manufactured Other Consumer Total (amounts in thousands) Ending Balance, June 30, 2016 $ 12,368 $ 10,370 $ 1,582 $ 8,483 $ 1,209 $ 3,535 $ 440 $ 110 $ 38,097 Charge-offs — (237 ) — (140 ) — (43 ) — (246 ) (666 ) Recoveries — 62 — — 8 298 — 10 378 Provision for loan losses (695 ) 832 305 3 (168 ) (411 ) (18 ) 240 88 Ending Balance, September 30, 2016 $ 11,673 $ 11,027 $ 1,887 $ 8,346 $ 1,049 $ 3,379 $ 422 $ 114 $ 37,897 Nine Months Ended September 30, 2016 Ending Balance, December 31, 2015 $ 12,016 $ 8,864 $ 1,348 $ 8,420 $ 1,074 $ 3,298 $ 494 $ 133 $ 35,647 Charge-offs — (774 ) — (140 ) — (456 ) — (478 ) (1,848 ) Recoveries — 173 — 8 465 299 — 10 955 Provision for loan losses (343 ) 2,764 539 58 (490 ) 238 (72 ) 449 3,143 Ending Balance, September 30, 2016 $ 11,673 $ 11,027 $ 1,887 $ 8,346 $ 1,049 $ 3,379 $ 422 $ 114 $ 37,897 As of December 31, 2016 Loans: Individually evaluated for impairment $ — $ 8,516 $ 2,050 $ 2,151 $ — $ 6,972 $ 9,665 $ 57 $ 29,411 Collectively evaluated for impairment 3,212,895 979,158 379,353 1,185,237 64,789 178,963 88,995 3,190 6,092,580 Loans acquired with credit deterioration 2,104 1,037 12,229 6,327 — 7,567 3,070 236 32,570 $ 3,214,999 $ 988,711 $ 393,632 $ 1,193,715 $ 64,789 $ 193,502 $ 101,730 $ 3,483 $ 6,154,561 Allowance for loan losses: Individually evaluated for impairment $ — $ 1,024 $ 287 $ 14 $ — $ 35 $ — $ — $ 1,360 Collectively evaluated for impairment 11,602 9,686 1,896 4,626 772 2,414 88 60 31,144 Loans acquired with credit deterioration — 340 — 3,254 68 893 198 58 4,811 $ 11,602 $ 11,050 $ 2,183 $ 7,894 $ 840 $ 3,342 $ 286 $ 118 $ 37,315
Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans	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 September 30, 2017 and December 31, 2016 and the average recorded investment and interest income recognized for the three and nine months ended September 30, 2017 and 2016 . Purchased-credit-impaired loans are considered to be performing and are not included in the tables below. September 30, 2017 Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 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: Commercial and industrial $ 19,433 $ 22,354 $ — $ 13,345 $ 354 $ 8,796 $ 450 Commercial real estate owner occupied 1,669 1,936 — 1,744 15 1,589 18 Commercial real estate non-owner occupied 184 428 — 184 91 989 93 Other consumer 32 32 — 44 — 50 — Residential real estate 7,457 7,664 — 5,228 125 4,865 126 Manufactured housing 10,340 10,340 — 10,243 164 10,038 457 With an allowance recorded: Commercial and industrial 1,060 1,331 625 1,963 — 5,400 22 Commercial real estate owner occupied 1,281 1,281 740 1,056 1 950 3 Commercial real estate non-owner occupied — — — 51 — 94 — Other consumer 24 24 15 12 — 6 — Residential real estate 721 741 142 2,862 — 2,729 84 Manufactured housing — — 5 114 — 108 8 Total $ 42,201 $ 46,131 $ 1,527 $ 36,846 $ 750 $ 35,614 $ 1,261 December 31, 2016 Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 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 $ — $ — $ — $ 2,080 $ 38 $ 1,205 $ 38 Commercial and industrial 2,396 3,430 — 21,859 406 18,681 879 Commercial real estate owner occupied 1,210 1,210 — 10,182 201 9,651 403 Commercial real estate non-owner occupied 2,002 2,114 — 7,983 118 6,081 133 Other consumer 57 57 — 43 — 45 — Residential real estate 6,682 6,749 — 3,835 39 4,039 83 Manufactured housing 9,665 9,665 — 8,971 9 8,785 290 With an allowance recorded: Multi-family — — — 383 5 290 15 Commercial and industrial 6,120 6,120 1,024 7,561 43 7,256 155 Commercial real estate - owner occupied 840 840 287 — — 6 — Commercial real estate non-owner occupied 149 204 14 328 2 438 6 Other consumer — — — — — 36 — Residential real estate 290 303 35 300 — 421 — Total $ 29,411 $ 30,692 $ 1,360 $ 63,525 $ 861 $ 56,934 $ 2,002
Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession	The following table presents loans modified in a troubled debt restructuring by type of concession for the three and nine months ended September 30, 2017 and 2016 . There were no modifications that involved forgiveness of debt. Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Extensions of maturity 1 $ 60 — $ — Interest-rate reductions 3 122 10 533 Total 4 $ 182 10 $ 533 Nine Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Extensions of maturity 4 $ 6,263 3 $ 1,995 Interest-rate reductions 32 1,297 49 1,932 Total 36 $ 7,560 52 $ 3,927
Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment	The following table provides, by loan type, the number of loans modified in troubled debt restructurings, and the related recorded investment, during the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 Three Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Commercial and industrial — $ — — $ — Manufactured housing 4 182 10 533 Residential real estate — — — — Total loans 4 $ 182 10 $ 533 Nine Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Number Recorded Number Recorded (dollars in thousands) Commercial and industrial 3 $ 6,203 1 $ 76 Commercial real estate non-owner occupied — — 1 1,844 Manufactured housing 33 1,357 47 1,716 Residential real estate — — 3 291 Total loans 36 $ 7,560 52 $ 3,927
Changes in Accretable Yield Related to Purchased-credit-impaired Loans	The changes in accretable yield related to purchased-credit-impaired loans for the three and nine months ended September 30, 2017 and 2016 were as follows: Three Months Ended September 30, 2017 2016 (amounts in thousands) Accretable yield balance as of June 30, $ 9,006 $ 11,165 Accretion to interest income (368 ) (460 ) Reclassification from nonaccretable difference and disposals, net (276 ) 107 Accretable yield balance as of September 30, $ 8,362 $ 10,812 Nine Months Ended September 30, 2017 2016 (amounts in thousands) Accretable yield balance as of December 31, $ 10,202 $ 12,947 Accretion to interest income (1,326 ) (1,429 ) Reclassification from nonaccretable difference and disposals, net (514 ) (706 ) Accretable yield balance as of September 30, $ 8,362 $ 10,812
Schedule of Changes in Allowance for Loan Losses	The following table presents changes in the allowance for loan losses and the FDIC loss sharing receivable, including the effects of the estimated clawback liability and the termination agreement, for the three and nine months ended September 30, 2017 and 2016 . Allowance for Loan Losses Three Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of June 30, $ 38,458 $ 38,097 Provision for loan losses (1) 2,352 88 Charge-offs (2,585 ) (666 ) Recoveries 89 378 Ending balance as of September 30, $ 38,314 $ 37,897 Allowance for Loan Losses Nine Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of December 31, $ 37,315 $ 35,647 Provision for loan losses (1) 5,937 3,143 Charge-offs (5,576 ) (1,848 ) Recoveries 638 955 Ending balance as of September 30, $ 38,314 $ 37,897
Schedule of FDIC Loss Sharing Receivable	FDIC Loss Sharing Receivable/ Clawback Liability Three Months Ended September 30, (amounts in thousands) 2017 2016 Ending balance as of June 30, $ — $ (1,381 ) Cash payments to the FDIC — 1,381 Ending balance as of September 30, $ — $ — (1) Provision for loan losses $ 2,352 $ 88 Net amount reported as provision for loan losses $ 2,352 $ 88 FDIC Loss Sharing Receivable/ Clawback Liability Nine Months Ended September 30, (amounts in thousands) 2017 2016 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 September 30, $ — $ — (1) Provision for loan losses $ 5,937 $ 3,143 (2) Effect attributable to FDIC loss share arrangements — (289 ) Net amount reported as provision for loan losses $ 5,937 $ 2,854 (a) Includes external costs, such as legal fees, real estate taxes, and appraisal expenses, which qualified for reimbursement under the FDIC loss sharing agreements.
Credit Ratings of Covered and Non-Covered Loan Portfolio	The following tables present the credit ratings of loans receivable as of September 30, 2017 and December 31, 2016 . September 30, 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) Pass/Satisfactory $ 3,577,304 $ 1,080,797 $ 468,389 $ 1,212,945 $ 73,203 $ 431,364 $ — $ — $ 6,844,002 Special Mention 36,604 8,663 9,716 22,008 — — — — 76,991 Substandard 5,081 25,762 8,462 2,896 — 3,824 — — 46,025 Performing (1) — — — — — — 85,537 3,694 89,231 Non-performing (2) — — — — — — 7,401 125 7,526 Total $ 3,618,989 $ 1,115,222 $ 486,567 $ 1,237,849 $ 73,203 $ 435,188 $ 92,938 $ 3,819 $ 7,063,775 December 31, 2016 Multi-family Commercial Commercial Commercial Real Estate Non-Owner Occupied Construction Residential Manufactured Other Consumer Total (amounts in thousands) Pass/Satisfactory $ 3,198,290 $ 954,846 $ 375,919 $ 1,175,850 $ 50,291 $ 189,919 $ — $ — $ 5,945,115 Special Mention — 19,552 12,065 10,824 14,498 — — — 56,939 Substandard 16,709 14,313 5,648 7,041 — 3,583 — — 47,294 Performing (1) — — — — — — 92,920 3,413 96,333 Non-performing (2) — — — — — — 8,810 70 8,880 Total $ 3,214,999 $ 988,711 $ 393,632 $ 1,193,715 $ 64,789 $ 193,502 $ 101,730 $ 3,483 $ 6,154,561 (1) Includes consumer and other installment loans not subject to risk ratings. (2) Includes loans that are past due and still accruing interest and loans on nonaccrual status.

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios	Generally, to be considered adequately capitalized, or well capitalized, respectively, an institution must at least maintain the common equity Tier 1, Tier 1 and total risk based ratios and the Tier 1 leverage ratio in excess of the related minimum ratios as set forth in the following table: Actual For Capital Adequacy Purposes (Minimum Plus Capital Buffer) To Be Well Capitalized Under Prompt Corrective Action Provisions (amounts in thousands) Amount Ratio Amount Ratio Amount Ratio As of September 30, 2017: Common equity Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 677,976 8.284 % $ 470,603 5.750 % N/A N/A Customers Bank $ 1,009,380 12.342 % $ 470,242 5.750 % $ 531,578 6.500 % Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 895,447 10.941 % $ 593,369 7.250 % N/A N/A Customers Bank $ 1,009,380 12.342 % $ 592,914 7.250 % $ 654,250 8.000 % Total capital (to risk weighted assets) Customers Bancorp, Inc. $ 1,014,784 12.399 % $ 757,057 9.250 % N/A N/A Customers Bank $ 1,156,766 14.145 % $ 756,477 9.250 % $ 817,813 10.000 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 895,447 8.355 % $ 428,709 4.000 % N/A N/A Customers Bank $ 1,009,380 9.434 % $ 427,963 4.000 % $ 534,954 5.000 % As of December 31, 2016: Common equity Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 628,139 8.487 % $ 379,306 5.125 % N/A N/A Customers Bank $ 857,421 11.626 % $ 377,973 5.125 % $ 479,380 6.500 % Tier 1 capital (to risk weighted assets) Customers Bancorp, Inc. $ 844,755 11.414 % $ 490,322 6.625 % N/A N/A Customers Bank $ 857,421 11.626 % $ 488,599 6.625 % $ 590,006 8.000 % Total capital (to risk weighted assets) Customers Bancorp, Inc. $ 966,097 13.053 % $ 638,343 8.625 % N/A N/A Customers Bank $ 1,003,609 13.608 % $ 636,101 8.625 % $ 737,508 10.000 % Tier 1 capital (to average assets) Customers Bancorp, Inc. $ 844,755 9.067 % $ 372,652 4.000 % N/A N/A Customers Bank $ 857,421 9.233 % $ 371,466 4.000 % $ 464,333 5.000 %

Disclosures About Fair Value 32

Disclosures About Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of Customers' financial instruments at September 30, 2017 and December 31, 2016 were as follows. BankMobile assets and liabilities previously reported as held for sale have been reclassified as held and used to conform with the current period presentation. Fair Value Measurements at September 30, 2017 Carrying Amount Estimated Fair Value 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 $ 219,480 $ 219,480 $ 219,480 $ — $ — Investment securities, available for sale 584,823 584,823 2,311 582,512 — Loans held for sale 2,113,293 2,113,473 — 1,963,076 150,397 Loans receivable, net of allowance for loan losses 7,023,024 7,020,487 — — 7,020,487 FHLB, Federal Reserve Bank and other restricted stock 98,611 98,611 — 98,611 — Derivatives 10,447 10,447 — 10,344 103 Liabilities: Deposits $ 7,597,076 $ 7,596,324 $ 5,296,636 $ 2,299,688 $ — Federal funds purchased 147,000 147,000 147,000 — — FHLB advances 1,462,343 1,462,245 727,343 734,902 — Other borrowings 186,258 194,157 65,704 128,453 — Subordinated debt 108,856 115,500 — 115,500 — Derivatives 12,092 12,092 — 12,092 — Fair Value Measurements at December 31, 2016 Carrying Amount Estimated Fair Value 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 $ 264,709 $ 264,709 $ 264,709 $ — $ — Investment securities, available for sale 493,474 493,474 15,246 478,228 — Loans held for sale 2,117,510 2,117,510 — 2,117,510 — Loans receivable, net of allowance for loan losses 6,117,322 6,162,020 — — 6,162,020 FHLB, Federal Reserve Bank and other restricted stock 68,408 68,408 — 68,408 — Derivatives 10,864 10,864 — 10,819 45 Liabilities: Deposits $ 7,303,775 $ 7,303,663 $ 4,472,013 $ 2,831,650 $ — Federal funds purchased 83,000 83,000 83,000 — — FHLB advances 868,800 869,049 688,800 180,249 — Other borrowings 87,123 91,761 66,261 25,500 — Subordinated debt 108,783 111,375 — 111,375 — Derivatives 14,172 14,172 — 14,172 —
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis	For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at September 30, 2017 and December 31, 2016 were as follows: September 30, 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 $ — $ 196,327 $ — $ 196,327 Agency guaranteed commercial mortgage-backed securities — 340,108 — 340,108 Corporate notes — 46,077 — 46,077 Equity securities 2,311 — — 2,311 Derivatives — 10,344 103 10,447 Loans held for sale – fair value option — 1,963,076 — 1,963,076 Total assets - recurring fair value measurements $ 2,311 $ 2,555,932 $ 103 $ 2,558,346 Liabilities Derivatives $ — $ 12,092 $ — $ 12,092 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of reserves of $1,527 $ — $ — $ 2,976 $ 2,976 Other real estate owned — — 782 782 Total assets - nonrecurring fair value measurements $ — $ — $ 3,758 $ 3,758 December 31, 2016 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 $ — $ 231,263 $ — $ 231,263 Agency-guaranteed commercial mortgage-backed securities — 201,817 — 201,817 Corporate notes — 45,148 — 45,148 Equity securities 15,246 — — 15,246 Derivatives — 10,819 45 10,864 Loans held for sale – fair value option — 2,117,510 — 2,117,510 Total assets - recurring fair value measurements $ 15,246 $ 2,606,557 $ 45 $ 2,621,848 Liabilities Derivatives $ — $ 14,172 $ — $ 14,172 Measured at Fair Value on a Nonrecurring Basis: Assets Impaired loans, net of reserves of $1,360 $ — $ — $ 6,527 $ 6,527 Other real estate owned — — 2,731 2,731 Total assets - nonrecurring fair value measurements $ — $ — $ 9,258 $ 9,258
Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis for the three and nine months ended September 30, 2017 and 2016 are summarized as follows. Additional information about residential mortgage loan commitments can be found in NOTE 13 - DERIVATIVES INSTRUMENTS AND HEDGING ACTIVITIES. Residential Mortgage Loan Commitments Three Months Ended September 30, 2017 2016 (amounts in thousands) Balance at June 30 $ 102 $ 157 Issuances 103 85 Settlements (102 ) (157 ) Balance at September 30 $ 103 $ 85 Residential Mortgage Loan Commitments Nine Months Ended September 30, 2017 2016 (amounts in thousands) Balance at December 31 $ 45 $ 45 Issuances 300 315 Settlements (242 ) (275 ) Balance at September 30 $ 103 $ 85
Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value as of September 30, 2017 and December 31, 2016 on a recurring and nonrecurring basis for which Customers utilized Level 3 inputs to measure fair value. Quantitative Information about Level 3 Fair Value Measurements September 30, 2017 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans $ 2,976 Collateral appraisal (1) Liquidation expenses (2) (8)% Other real estate owned 782 Collateral appraisal (1) Liquidation expenses (2) (8)% Residential mortgage loan commitments 103 Adjusted market bid Pull-through rate 90% Quantitative Information about Level 3 Fair Value Measurements December 31, 2016 Fair Value Estimate Valuation Technique Unobservable Input Range (Weighted Average) (4) (amounts in thousands) Impaired loans $ 1,431 Collateral appraisal (1) Liquidation expenses (2) (8)% Impaired loans 5,096 Discounted cash flow Projected cash flows (3) 4 times EBITDA Other real estate owned 2,731 Collateral appraisal (1) Liquidation expenses (2) (8)% Residential mortgage loan commitments 45 Adjusted market bid Pull-through rate 90% (1) Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. The Bank does not generally discount appraisals. (2) Fair value is adjusted for estimated costs to sell based on a percentage of the value as determined by the appraisal. (3) Projected cash flows of the business derived using EBITDA multiple based on management's best estimate. (4) Presented as a percentage of the value determined by appraisal for impaired loans and other real estate owned.

Derivative Instruments and He33

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The following tables present the fair value of Customers' derivative financial instruments as well as their presentation on the balance sheet as of September 30, 2017 and December 31, 2016 . September 30, 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 $ 355 Other liabilities $ 2,001 Total $ 355 $ 2,001 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 9,861 Other liabilities $ 10,083 Credit contracts Other assets 128 Other liabilities 8 Residential mortgage loan commitments Other assets 103 Other liabilities — Total $ 10,092 $ 10,091 December 31, 2016 Derivative Assets Derivative Liabilities Balance Sheet Balance Sheet Location Fair Value Location Fair Value (amounts in thousands) Derivatives designated as cash flow hedges: Interest rate swaps Other assets $ — Other liabilities $ 3,624 Total $ — $ 3,624 Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 10,683 Other liabilities $ 10,537 Credit contracts Other assets 136 Other liabilities 11 Residential mortgage loan commitments Other assets 45 Other liabilities — Total $ 10,864 $ 10,548
Effect of Derivative Financial Instruments on Comprehensive Income	The following tables present the effect of Customers' derivative financial instruments on comprehensive income for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended September 30, 2017 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 91 Credit contracts Other non-interest income (6 ) Residential mortgage loan commitments Mortgage banking income 1 Total $ 86 Three Months Ended September 30, 2016 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 1,737 Credit contracts Other non-interest income (15 ) Residential mortgage loan commitments Mortgage banking income (71 ) Total $ 1,651 Nine Months Ended September 30, 2017 Income Statement Location Amount of Income (Loss) Recognized in Earnings (amounts in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other non-interest income $ 429 Credit contracts Other non-interest income (5 ) Residential mortgage loan commitments Mortgage banking income 58 Total $ 482 Nine Months Ended September 30, 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 $ 1,250 Credit contracts Other non-interest income 257 Residential mortgage loan commitments Mortgage banking income 41 Total $ 1,548 Three Months Ended September 30, 2017 Amount of Gain Recognized in OCI on Derivatives (Effective Portion) (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 104 Interest expense $ (572 ) Three Months Ended September 30, 2016 Amount of Gain Recognized in OCI on Derivatives (Effective Portion) (1) Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) (amounts in thousands) Derivatives in cash flow hedging relationships: Interest rate swaps $ 556 Interest expense $ (703 ) Nine Months Ended September 30, 2017 Amount of Loss Location of Gain (Loss) Amount of Loss (amounts in thousands) Derivative in cash flow hedging relationships: Interest rate swaps $ (115 ) Interest expense $ (2,166 ) Nine Months Ended September 30, 2016 Amount of Loss Location of Gain (Loss) Amount of Loss (amounts in thousands) Derivative in cash flow hedging relationships: Interest rate swaps $ (1,577 ) Interest expense $ (1,306 ) (1) Amounts presented are net of taxes. See NOTE 6 - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME for total effect on other comprehensive income from derivatives designated as cash flow hedges for the periods presented.
Summary of Offsetting of Financial Assets and Derivative Assets	Offsetting of Financial Assets and Derivative Assets At December 31, 2016 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts Net Amount Financial Instruments Cash Collateral Received (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 4,723 $ — $ 4,723 $ — $ — $ 4,723 Offsetting of Financial Assets and Derivative Assets At September 30, 2017 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amount Financial Instruments Cash Collateral Received (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 4,190 $ — $ 4,190 $ — $ 1,900 $ 2,290
Summary of Offsetting of Financial Liabilities and Derivative Liabilities	Offsetting of Financial Liabilities and Derivative Liabilities At December 31, 2016 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts Net Amount Financial Instruments Cash Collateral Pledged (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 9,825 $ — $ 9,825 $ — $ 4,472 $ 5,353 Offsetting of Financial Liabilities and Derivative Liabilities At September 30, 2017 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts Financial Instruments Cash Collateral Pledged Net Amount (amounts in thousands) Description Interest rate swap derivatives with institutional counterparties $ 8,400 $ — $ 8,400 $ — $ 8,262 $ 138

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables present the operating results for Customers' reportable business segments for the three and nine months ended September 30, 2017 and 2016. Customers has presented the financial information and disclosures for prior periods to reflect the segment disclosures as if they had been in effect for the periods presented. The segment financial results include directly attributable revenues and expenses. Corporate overhead costs are assigned to the Community Business Banking segment as those expenses are expected to continue following the planned spin-off of BankMobile. Similarly, the preferred stock dividends have been allocated in their entirety to the Community Business Banking segment. The tax benefit assigned to BankMobile was based on an estimated effective tax rate of 37.25% for 2017 and 38% for 2016. BankMobile, previously presented as discontinued operations in the financial statements due to Customers' stated intent to sell the business, was reclassified as held and used at September 30, 2017. As of September 30, 2017, Customers has decided to spin off BankMobile to Customers’ shareholders through a spin-off/merger transaction which is currently being negotiated. For more information on BankMobile's reclassification, see NOTE 3 - TAX-FREE SPIN-OFF AND MERGER. Three Months Ended September 30, 2017 Community Business Banking BankMobile Consolidated Interest income $ 95,585 $ 2,700 (1 ) $ 98,285 Interest expense 30,250 16 30,266 Net interest income 65,335 2,684 68,019 Provision for loan losses 1,874 478 2,352 Non-interest income 4,190 13,836 18,026 Non-interest expense 33,990 27,050 61,040 Income (loss) before income tax expense (benefit) 33,661 (11,008 ) 22,653 Income tax expense (benefit) 18,999 (4,100 ) 14,899 Net income (loss) 14,662 (6,908 ) 7,754 Preferred stock dividends 3,615 — 3,615 Net income (loss) available to common shareholders $ 11,047 $ (6,908 ) $ 4,139 Three Months Ended September 30, 2016 Community Business Banking BankMobile Consolidated Interest income $ 82,828 $ 1,384 (1 ) $ 84,212 Interest expense 19,620 7 19,627 Net interest income 63,208 1,377 64,585 Provision for loan losses (162 ) 250 88 Non-interest income 11,121 16,365 27,486 Non-interest expense 36,864 19,354 56,218 Income (loss) before income tax expense (benefit) 37,627 (1,862 ) 35,765 Income tax expense (benefit) 15,266 (708 ) 14,558 Net income (loss) 22,361 (1,154 ) 21,207 Preferred stock dividends 2,552 — 2,552 Net income (loss) available to common shareholders $ 19,809 $ (1,154 ) $ 18,655 (1) - Amounts reported include funds transfer pricing of $2.7 million and 1.4 million for the three months ended September 30, 2017 and 2016 , respectively, credited to BankMobile for the value provided to the Community Business Banking segment for the use of low/no cost deposits. Nine Months Ended September 30, 2017 Community Business Banking BankMobile Consolidated Interest income $ 265,524 $ 9,708 (1 ) $ 275,232 Interest expense 76,134 55 76,189 Net interest income 189,390 9,653 199,043 Provision for loan losses 5,459 478 5,937 Non-interest income 16,587 42,583 59,170 Non-interest expense 94,704 66,114 160,818 Income before income tax expense (benefit) 105,814 (14,356 ) 91,458 Income tax expense (benefit) 39,584 (5,348 ) 34,236 Net income (loss) 66,230 (9,008 ) 57,222 Preferred stock dividends 10,844 — 10,844 Net income (loss) available to common shareholders $ 55,386 $ (9,008 ) $ 46,378 As of September 30, 2017 Goodwill and other intangibles $ 3,632 $ 12,972 $ 16,604 Total assets $ 10,405,452 $ 66,377 (2 ) $ 10,471,829 Total deposits $ 6,815,994 $ 781,082 $ 7,597,076 Nine Months Ended September 30, 2016 Community Business Banking BankMobile Consolidated Interest income $ 234,513 $ 4,418 (1 ) $ 238,931 Interest expense 53,539 22 53,561 Net interest income 180,974 4,396 185,370 Provision for loan losses 2,605 249 2,854 Non-interest income 22,241 18,996 41,237 Non-interest expense 101,053 27,253 128,306 Income (loss) before income tax expense (benefit) 99,557 (4,110 ) 95,447 Income tax expense (benefit) 38,134 (1,562 ) 36,572 Net income (loss) 61,423 (2,548 ) 58,875 Preferred stock dividends 5,900 — 5,900 Net income (loss) available to common shareholders $ 55,523 $ (2,548 ) $ 52,975 As of September 30, 2016 Goodwill and other intangibles $ 3,642 $ 13,282 $ 16,924 Total assets $ 9,532,281 $ 70,329 (2 ) $ 9,602,610 Total deposits $ 6,855,788 $ 533,182 $ 7,388,970 (1) - Amounts reported include funds transfer pricing of $9.7 million and $4.4 million for the nine months ended September 30, 2017 and 2016 , respectively, credited to BankMobile for the value provided to the Community Business Banking segment for the use of low/no cost deposits. (2) - Amounts reported exclude intra company receivables.

Description of the Business - A

Description of the Business - Additional Information (Detail)	Sep. 30, 2017Branch
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of branches (branch)	14

Acquisition Activity - Addition

Acquisition Activity - Additional Information (Detail)	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 15, 2016USD ($)employee	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Capital Unit [Line Items]
Cash consideration at closing						$ 0	$ 17,000,000
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business
Capital Unit [Line Items]
Number of employees hired (employee) | employee			225
Aggregate guaranteed payments			$ 42,000,000
Transaction cash consideration	$ 37,000,000		37,000,000
Cash consideration at closing			17,000,000
Business acquisition payables			20,000,000
Payments for services under transition services agreement			$ 5,000,000
Period following the closing for potential additional payments			3 years
Revenue amount to trigger additional payments			$ 75,000,000
Possible payment as a percent of amount that exceeds revenue			35.00%
Payables to Higher One	10,000,000	$ 20,000,000
Goodwill recognized	$ 5,259,000		$ 4,300,000
Increase in goodwill					$ 1,000,000
Depreciation, Depletion and Amortization, Nonproduction				$ 3,500,000		$ 4,300,000
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Developed software
Capital Unit [Line Items]
Useful life			10 years
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Other Intangible Assets | Minimum
Capital Unit [Line Items]
Useful life			4 years
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Other Intangible Assets | Maximum
Capital Unit [Line Items]
Useful life			20 years
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | First Anniversary of Closing
Capital Unit [Line Items]
Business acquisition payables			$ 10,000,000	$ 10,000,000
Payables to Higher One			10,000,000
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Second Anniversary of Closing
Capital Unit [Line Items]
Business acquisition payables			10,000,000
Payables to Higher One			$ 10,000,000

Acquisition Activity - Estimate

Acquisition Activity - Estimated Fair Values (Details) - Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 15, 2016	Jun. 30, 2017	Sep. 30, 2017
Fair value of assets acquired:
Accounts receivable	$ 2,784		$ 2,784
Prepaid expenses	418		418
Fixed assets, net	229		229
Total assets acquired	40,131		40,131
Fair value of liabilities assumed:
Other liabilities	5,735		5,735
Deferred revenue	2,655		2,655
Total liabilities assumed	8,390		8,390
Net assets acquired	31,741		31,741
Transaction cash consideration	37,000	$ 37,000
Goodwill recognized	5,259	4,300	5,259
Business acquisition payables		20,000
Payment to Higher One			10,000
First Anniversary of Closing
Fair value of liabilities assumed:
Business acquisition payables		10,000		$ 10,000
Second Anniversary of Closing
Fair value of liabilities assumed:
Business acquisition payables		$ 10,000
Developed software
Fair value of assets acquired:
Intangible assets acquired	27,400		27,400
Other Intangible Assets
Fair value of assets acquired:
Intangible assets acquired	$ 9,300		$ 9,300

Tax-Free Spin-Off and Merger -

Tax-Free Spin-Off and Merger - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2018
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | BankMobile
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation on reclassified assets	$ 4.2
Flagship Community Bank | Forecast | Spinoff | Common Stock | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of stock, percentage of ownership after transaction		50.00%
Value of consideration received		$ 110

Tax-Free Spin-Off and Merger 39

Tax-Free Spin-Off and Merger - Balance Sheet (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff $ in Thousands	Dec. 31, 2016USD ($)
ASSETS
Cash and cash equivalents	$ 264,709
Loans receivable	6,154,637
Bank premises and equipment, net	12,769
Goodwill and other intangibles	17,621
Assets held for sale	0
Other assets	102,631
LIABILITIES
Demand, non-interest bearing deposits	966,058
Interest bearing deposits	6,337,717
Non-interest bearing deposits held for sale	0
Other liabilities held for sale	0
Accrued interest payable and other liabilities	75,383
Previously Reported
ASSETS
Cash and cash equivalents	244,709
Loans receivable	6,142,390
Bank premises and equipment, net	12,259
Goodwill and other intangibles	3,639
Assets held for sale	79,271
Other assets	70,099
LIABILITIES
Demand, non-interest bearing deposits	512,664
Interest bearing deposits	6,334,316
Non-interest bearing deposits held for sale	453,394
Other liabilities held for sale	31,403
Accrued interest payable and other liabilities	47,381
Restatement Adjustment | BankMobile
ASSETS
Cash and cash equivalents	20,000
Loans receivable	12,247
Bank premises and equipment, net	510
Goodwill and other intangibles	13,982
Assets held for sale	(79,271)
Other assets	32,532
LIABILITIES
Demand, non-interest bearing deposits	453,394
Interest bearing deposits	3,401
Non-interest bearing deposits held for sale	(453,394)
Other liabilities held for sale	(31,403)
Accrued interest payable and other liabilities	$ 28,002

Tax-Free Spin-Off and Merger 40

Tax-Free Spin-Off and Merger - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 14,899	$ 14,558	$ 34,236	$ 36,572
Net income	7,754	21,207	57,222	58,875
Preferred stock dividends	3,615	2,552	10,844	5,900
Net income (loss) available to common shareholders	$ 4,139	18,655	$ 46,378	52,975
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		84,212		238,931
Interest expense		19,627		53,561
Net interest income		64,585		185,370
Provision for loan losses		88		2,854
Non-interest income		27,486		41,237
Non-interest expense		56,218		128,306
Income from continuing operations before income taxes		35,765		95,447
Income tax expense		14,558		36,572
Net income from continuing operations		21,207		58,875
Loss from discontinued operations before income tax benefit		0		0
Income tax benefit from discontinued operations		0		0
Net loss from discontinued operations		0		0
Net income		21,207		58,875
Preferred stock dividends		2,552		5,900
Net income (loss) available to common shareholders		18,655		52,975
Previously Reported | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		84,212		238,931
Interest expense		19,622		53,548
Net interest income		64,590		185,383
Provision for loan losses		(161)		2,605
Non-interest income		11,121		22,241
Non-interest expense		36,750		100,706
Income from continuing operations before income taxes		39,122		104,313
Income tax expense		15,834		39,942
Net income from continuing operations		23,288		64,371
Loss from discontinued operations before income tax benefit		(3,357)		(8,865)
Income tax benefit from discontinued operations		(1,276)		(3,369)
Net loss from discontinued operations		(2,081)		(5,496)
Net income		21,207		58,875
Preferred stock dividends		2,552		5,900
Net income (loss) available to common shareholders		18,655		52,975
Restatement Adjustment | BankMobile | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		0		0
Interest expense		5		13
Net interest income		(5)		(13)
Provision for loan losses		249		249
Non-interest income		16,365		18,996
Non-interest expense		19,468		27,600
Income from continuing operations before income taxes		(3,357)		(8,866)
Income tax expense		(1,276)		(3,370)
Net income from continuing operations		(2,081)		(5,496)
Loss from discontinued operations before income tax benefit		3,357		8,865
Income tax benefit from discontinued operations		1,276		3,369
Net loss from discontinued operations		2,081		5,496
Net income		0		0
Preferred stock dividends		0		0
Net income (loss) available to common shareholders		$ 0		$ 0

Earnings Per Share - Components

Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 4,139	$ 18,655	$ 46,378	$ 52,975
Weighted-average number of common shares outstanding - basic (shares)	30,739,671	27,367,551	30,597,314	27,131,960
Share-based compensation plans (shares)	1,754,480	2,205,291	2,004,917	2,119,717
Warrants (shares)	18,541	124,365	24,392	243,531
Weighted-average number of common shares - diluted (shares)	32,512,692	29,697,207	32,626,623	29,495,208
Basic earnings per common share (usd per share)	$ 0.13	$ 0.68	$ 1.52	$ 1.95
Diluted earnings per common share (usd per share)	$ 0.13	$ 0.63	$ 1.42	$ 1.80

Earnings Per Share - Anti-dilut

Earnings Per Share - Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Anti-dilutive securities:
Total anti-dilutive securities (shares)	461,467	669,237	461,467	669,237
Share-based compensation awards
Anti-dilutive securities:
Total anti-dilutive securities (shares)	409,225	616,995	409,225	616,995
Warrants
Anti-dilutive securities:
Total anti-dilutive securities (shares)	52,242	52,242	52,242	52,242

Changes in Accumulated Other 43

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 855,872	$ 553,902
Ending balance	$ 910,642	$ 789,811	910,642	789,811
Unrealized Gains (Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	6,822	4,895	(2,681)	(4,602)
Other comprehensive income (loss) before reclassifications	(2,177)	15	9,268	9,529
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(3,263)	1	(5,205)	(16)
Net current-period other comprehensive income (loss)	(5,440)	16	4,063	9,513
Ending balance	1,382	4,911	1,382	4,911
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(768)		(584)
Other comprehensive income (loss) before reclassifications		190		6
Amounts reclassified from accumulated other comprehensive income (loss) to net income		0		0
Net current-period other comprehensive income (loss)		190		6
Ending balance		(578)		(578)
Total Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		4,127		(5,186)
Other comprehensive income (loss) before reclassifications		205		9,535
Amounts reclassified from accumulated other comprehensive income (loss) to net income		1		(16)
Net current-period other comprehensive income (loss)		206		9,519
Ending balance		4,333		4,333
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,458)	(4,554)	(2,211)	(2,798)
Other comprehensive income (loss) before reclassifications	104	556	(115)	(1,577)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	349	439	1,321	816
Net current-period other comprehensive income (loss)	453	995	1,206	(761)
Ending balance	(1,005)	(3,559)	(1,005)	(3,559)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	5,364	(427)	(4,892)	(7,984)
Other comprehensive income (loss) before reclassifications	(2,073)	761	9,153	7,958
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(2,914)	440	(3,884)	800
Net current-period other comprehensive income (loss)	(4,987)	1,201	5,269	8,758
Ending balance	$ 377	$ 774	$ 377	$ 774

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 582,558	$ 497,869
Gross Unrealized Gains	4,483	1,319
Gross Unrealized Losses	(2,218)	(5,714)
Fair value	584,823	493,474
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,958	44,932
Gross Unrealized Gains	1,119	401
Gross Unrealized Losses	0	(185)
Fair value	46,077	45,148
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	197,606	233,002
Gross Unrealized Gains	521	918
Gross Unrealized Losses	(1,800)	(2,657)
Fair value	196,327	231,263
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	337,683	204,689
Gross Unrealized Gains	2,843	0
Gross Unrealized Losses	(418)	(2,872)
Fair value	340,108	201,817
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,311	15,246
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair value	$ 2,311	$ 15,246

Investment Securities - Stateme

Investment Securities - Statement of Proceeds from Sale of Available for Sale Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale securities	$ 554,540	$ 5	$ 698,451	$ 2,853
Gross gains	5,349	0	8,532	26
Gross losses	0	(1)	0	(1)
Net gains (losses)	$ 5,349	$ (1)	$ 8,532	$ 25

Investment Securities - Summa46

Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	$ 0
Due after one year through five years, amortized cost	0
Due after five years through ten years, amortized cost	42,958
Due after ten years, amortized cost	2,000
Total debt securities, amortized cost	580,247
Due in one year or less, fair value	0
Due after one year through five years, fair value	0
Due after five years through ten years, fair value	43,854
Due after ten years, fair value	2,223
Total debt securities, fair value	582,512
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	197,606
Agency-guaranteed mortgage-backed securities, fair value	196,327
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	337,683
Agency-guaranteed mortgage-backed securities, fair value	$ 340,108

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 159,569	$ 298,997
Less Than 12 Months, Unrealized Losses	(697)	(4,387)
12 Months or More, Fair Value	45,682	30,592
12 Months or More, Unrealized Losses	(1,521)	(1,327)
Fair Value, Total	205,251	329,589
Unrealized Losses	(2,218)	(5,714)
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		9,747
Less Than 12 Months, Unrealized Losses		(185)
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses		0
Fair Value, Total		9,747
Unrealized Losses		(185)
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	54,525	87,433
Less Than 12 Months, Unrealized Losses	(279)	(1,330)
12 Months or More, Fair Value	45,682	30,592
12 Months or More, Unrealized Losses	(1,521)	(1,327)
Fair Value, Total	100,207	118,025
Unrealized Losses	(1,800)	(2,657)
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	105,044	201,817
Less Than 12 Months, Unrealized Losses	(418)	(2,872)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value, Total	105,044	201,817
Unrealized Losses	$ (418)	$ (2,872)

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Security	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)Security	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of available-for-sale investment securities in the less than twelve month category (security) | Security	16		16
Number of available-for-sale investment securities in the twelve month or more category (security) | Security	11		11
Impairment loss on investment securities	$ 8,349	$ 0	$ 12,934	$ 0
Cost basis	582,558		582,558		$ 497,869
Pledged investment securities fair value	127,600		127,600		231,300
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Cost basis	2,311		2,311		$ 15,246
BankMobile | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Schedule of Available-for-sale Securities [Line Items]
Deferred tax assets	$ 4,600		$ 4,600

Loans Held for Sale - Compositi

Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Receivables Held-for-sale [Abstract]
Mortgage warehouse loans, at fair value		$ 2,116,815	$ 1,961,248
Multi-family loans at lower of cost or fair value		0	150,217
Total commercial loans held for sale		2,116,815	2,111,465
Residential mortgage loans, at fair value		695	1,828
Loans held for sale		2,117,510	$ 2,113,293
Loans held for sale, average life from purchase to sale			21 days
Transfer of loans held for investment to loans held for sale	$ 150,800		$ 150,638	$ 0
Transfer of loans held for sale to held for investment		$ 25,100

Loans Receivable and Allowanc50

Loans Receivable and Allowance for Loan Losses - Schedule of Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 7,063,775			$ 6,154,561
Deferred (fees)/costs and unamortized (discounts)/premiums, net	(2,437)			76
Allowance for loan losses	(38,314)	$ (38,458)		(37,315)	$ (37,897)	$ (38,097)	$ (35,647)
Total loans receivable, net of allowance for loan losses	7,023,024			6,117,322
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,618,989			3,214,999
Allowance for loan losses	(12,696)	(12,028)		(11,602)	(11,673)	(12,368)	(12,016)
Total loans receivable, net of allowance for loan losses	11,000	7,000	$ 94,900
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	73,203			64,789
Allowance for loan losses	(847)	(716)		(840)	(1,049)	(1,209)	(1,074)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	435,188			193,502
Allowance for loan losses	(2,954)	(2,995)		(3,342)	(3,379)	(3,535)	(3,298)
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	92,938			101,730
Allowance for loan losses	(191)	(268)		(286)	(422)	(440)	(494)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,819			3,483
Allowance for loan losses	(159)	$ (104)		(118)	$ (114)	$ (110)	$ (133)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	6,531,830			5,855,846
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,618,989			3,214,999
Commercial | Commercial and industrial (including owner occupied commercial real estate)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,601,789			1,382,343
Commercial | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,237,849			1,193,715
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	73,203			64,789
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	531,945			298,715
Consumer | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	435,188			193,502
Consumer | Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	92,938			101,730
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 3,819			$ 3,483

Loans Receivable and Allowanc51

Loans Receivable and Allowance for Loan Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 7,116	$ 24,063
Non-Accrual	29,842	17,792
Current	6,999,227	6,080,136
Loans receivable	7,061,338	6,154,637
Loans receivable, gross	$ 7,063,775	6,154,561
Due days for loan payments	30 days
Delinquent period	90 days
Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 27,590	32,570
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,611	21,250
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,505	2,813
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	12,573
Non-Accrual	0	0
Current	3,617,062	3,200,322
Loans receivable, gross	3,618,989	3,214,999
Multi-family | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,927	2,104
Multi-family | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	12,573
Multi-family | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	350
Non-Accrual	20,423	8,443
Current	1,093,997	978,881
Loans receivable, gross	1,115,222	988,711
Commercial and industrial | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	802	1,037
Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	350
Commercial and industrial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	137
Non-Accrual	2,949	2,039
Current	472,832	379,227
Loans receivable, gross	486,567	393,632
Commercial real estate - owner occupied | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,786	12,229
Commercial real estate - owner occupied | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	137
Commercial real estate - owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Non-Accrual	184	2,057
Current	1,232,212	1,185,331
Loans receivable, gross	1,237,849	1,193,715
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,453	6,327
Commercial real estate - non-owner occupied | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial real estate - non-owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Non-Accrual	0	0
Current	73,203	64,789
Loans receivable, gross	73,203	64,789
Construction | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Construction | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Construction | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,607	4,417
Non-Accrual	4,269	2,959
Current	423,551	178,559
Loans receivable, gross	435,188	193,502
Residential real estate | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,761	7,567
Residential real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,607	4,417
Residential real estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	5,442	6,574
Non-Accrual	1,959	2,236
Current	82,896	89,850
Loans receivable, gross	92,938	101,730
Manufactured housing | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,641	3,070
Manufactured housing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,937	3,761
Manufactured housing | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,505	2,813
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	67	12
Non-Accrual	58	58
Current	3,474	3,177
Loans receivable, gross	3,819	3,483
Other | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	220	236
Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	67	12
Other | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 0	$ 0

Loans Receivable and Allowanc52

Loans Receivable and Allowance for Loan Losses - Additional Information (Detail)	Jul. 11, 2016USD ($)	Sep. 30, 2017USD ($)AllowanceCommitmentLoan	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Sep. 30, 2016USD ($)AllowanceLoan	Jun. 30, 2016USD ($)Loan	Mar. 31, 2016USD ($)	Sep. 30, 2017USD ($)AllowanceCommitmentLoan	Sep. 30, 2016USD ($)AllowanceLoan	Dec. 31, 2016USD ($)Commitment
Financing Receivable, Modifications [Line Items]
Funds for reimbursement		$ 700,000						$ 700,000		$ 1,000,000
Loans reported as TDR		$ 20,800,000						$ 20,800,000		$ 16,400,000
Minimum performance requirement								6 months
Sustained performance period								9 months
Number of commitments to lend additional funds (commitment) | Commitment		0						0		0
Loans modified as TDR allowance (allowance) | Allowance		0			1				0
Number of Loans | Loan		4			10			36	52
Payments for early termination of FDIC loss sharing agreement	$ 1,400,000
Residential mortgage loans acquired			$ 90,000,000	$ 174,200,000	$ 0				$ 0
Term of fixed rate residential mortgage loans			30 years	30 years
Purchase price as a percentage of loans outstanding			101.00%	98.50%
Loans receivable, net of allowance for loan losses		$ 7,023,024,000						$ 7,023,024,000		$ 6,117,322,000
Proceeds from sales of loans								124,703,000	91,868,000
Gain on sale of SBA and other loans		1,144,000			$ 1,206,000			3,045,000	$ 2,135,000
Number of loans sold | Loan					0
Residential real estate
Financing Receivable, Modifications [Line Items]
Residential real estate held in other real estate owned		300,000						300,000		500,000
Loans in process of foreclosure		1,500,000						$ 1,500,000		400,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan								1
Loans modified as TDR								$ 2,300,000
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Loans modified as TDR allowance (allowance) | Allowance								1
Allowance for credit losses, effect of change in method								$ 29,000
Loans receivable, net of allowance for loan losses						$ 5,700,000
Gain on sale of SBA and other loans						$ 100,000
Number of loans sold | Loan						1
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan								10	5
Loans modified as TDR								$ 500,000	$ 100,000
Loans modified as TDR allowance (allowance) | Allowance								1
Allowance for credit losses, effect of change in method								$ 1,000
Small Business Administration Loan
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses				$ 8,700,000		$ 3,600,000	$ 6,900,000
Gain on sale of SBA and other loans		1,100,000	$ 600,000	800,000		$ 400,000	$ 600,000
Multi-family
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses		$ 11,000,000	$ 7,000,000	94,900,000				11,000,000
Proceeds from sales of loans				95,400,000
Gain on sale of SBA and other loans				$ 500,000
Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		0			0
Federal Home Loan Bank of Pittsburgh
Financing Receivable, Modifications [Line Items]
Loans pledged as collateral		$ 5,500,000,000						$ 5,500,000,000		$ 4,800,000,000

Loans Receivable and Allowanc53

Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 38,458	$ 38,097	$ 37,315	$ 35,647
Charge-offs	(2,585)	(666)	(5,576)	(1,848)
Recoveries	89	378	638	955
Provision for loan losses	2,352	88	5,937	3,143
Ending balance	38,314	37,897	38,314	37,897
Loans:
Individually evaluated for impairment					$ 42,201	$ 29,411
Collectively evaluated for impairment					6,993,984	6,092,580
Loans receivable, gross					7,063,775	6,154,561
Allowance for loan losses:
Individually evaluated for impairment					1,527	1,360
Collectively evaluated for impairment					32,616	31,144
Total Allowance for loan losses	38,458	38,097	37,315	35,647	38,314	37,315
Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					27,590	32,570
Allowance for loan losses:
Loans acquired with credit deterioration					4,171	4,811
Multi-family
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,028	12,368	11,602	12,016
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	668	(695)	1,094	(343)
Ending balance	12,696	11,673	12,696	11,673
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					3,617,062	3,212,895
Loans receivable, gross					3,618,989	3,214,999
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					12,696	11,602
Total Allowance for loan losses	12,028	12,368	11,602	12,016	12,696	11,602
Multi-family | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					1,927	2,104
Allowance for loan losses:
Loans acquired with credit deterioration					0	0
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,585	10,370	11,050	8,864
Charge-offs	(2,032)	(237)	(4,079)	(774)
Recoveries	54	62	337	173
Provision for loan losses	966	832	3,265	2,764
Ending balance	10,573	11,027	10,573	11,027
Loans:
Individually evaluated for impairment					20,493	8,516
Collectively evaluated for impairment					1,093,927	979,158
Loans receivable, gross					1,115,222	988,711
Allowance for loan losses:
Individually evaluated for impairment					625	1,024
Collectively evaluated for impairment					9,462	9,686
Total Allowance for loan losses	11,585	10,370	11,050	8,864	10,573	11,050
Commercial and industrial | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					802	1,037
Allowance for loan losses:
Loans acquired with credit deterioration					486	340
Commercial real estate - owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,976	1,582	2,183	1,348
Charge-offs	0	0	0	0
Recoveries	0	0	9	0
Provision for loan losses	262	305	1,046	539
Ending balance	3,238	1,887	3,238	1,887
Loans:
Individually evaluated for impairment					2,950	2,050
Collectively evaluated for impairment					472,831	379,353
Loans receivable, gross					486,567	393,632
Allowance for loan losses:
Individually evaluated for impairment					740	287
Collectively evaluated for impairment					2,481	1,896
Total Allowance for loan losses	2,976	1,582	2,183	1,348	3,238	2,183
Commercial real estate - owner occupied | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					10,786	12,229
Allowance for loan losses:
Loans acquired with credit deterioration					17	0
Commercial real estate - non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,786	8,483	7,894	8,420
Charge-offs	(77)	(140)	(485)	(140)
Recoveries	0	0	0	8
Provision for loan losses	(53)	3	247	58
Ending balance	7,656	8,346	7,656	8,346
Loans:
Individually evaluated for impairment					184	2,151
Collectively evaluated for impairment					1,232,212	1,185,237
Loans receivable, gross					1,237,849	1,193,715
Allowance for loan losses:
Individually evaluated for impairment					0	14
Collectively evaluated for impairment					4,732	4,626
Total Allowance for loan losses	7,786	8,483	7,894	8,420	7,656	7,894
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					5,453	6,327
Allowance for loan losses:
Loans acquired with credit deterioration					2,924	3,254
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	716	1,209	840	1,074
Charge-offs	0	0	0	0
Recoveries	27	8	157	465
Provision for loan losses	104	(168)	(150)	(490)
Ending balance	847	1,049	847	1,049
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					73,203	64,789
Loans receivable, gross					73,203	64,789
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					847	772
Total Allowance for loan losses	716	1,209	840	1,074	847	840
Construction | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					0	0
Allowance for loan losses:
Loans acquired with credit deterioration					0	68
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,995	3,535	3,342	3,298
Charge-offs	(120)	(43)	(410)	(456)
Recoveries	7	298	34	299
Provision for loan losses	72	(411)	(12)	238
Ending balance	2,954	3,379	2,954	3,379
Loans:
Individually evaluated for impairment					8,178	6,972
Collectively evaluated for impairment					421,249	178,963
Loans receivable, gross					435,188	193,502
Allowance for loan losses:
Individually evaluated for impairment					142	35
Collectively evaluated for impairment					2,222	2,414
Total Allowance for loan losses	2,995	3,535	3,342	3,298	2,954	3,342
Residential real estate | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					5,761	7,567
Allowance for loan losses:
Loans acquired with credit deterioration					590	893
Manufactured housing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	268	440	286	494
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	(77)	(18)	(95)	(72)
Ending balance	191	422	191	422
Loans:
Individually evaluated for impairment					10,340	9,665
Collectively evaluated for impairment					79,957	88,995
Loans receivable, gross					92,938	101,730
Allowance for loan losses:
Individually evaluated for impairment					5	0
Collectively evaluated for impairment					83	88
Total Allowance for loan losses	268	440	286	494	191	286
Manufactured housing | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					2,641	3,070
Allowance for loan losses:
Loans acquired with credit deterioration					103	198
Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	104	110	118	133
Charge-offs	(356)	(246)	(602)	(478)
Recoveries	1	10	101	10
Provision for loan losses	410	240	542	449
Ending balance	159	114	159	114
Loans:
Individually evaluated for impairment					56	57
Collectively evaluated for impairment					3,543	3,190
Loans receivable, gross					3,819	3,483
Allowance for loan losses:
Individually evaluated for impairment					15	0
Collectively evaluated for impairment					93	60
Total Allowance for loan losses	$ 104	$ 110	$ 118	$ 133	159	118
Other | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					220	236
Allowance for loan losses:
Loans acquired with credit deterioration					$ 51	$ 58

Loans Receivable and Allowanc54

Loans Receivable and Allowance for Loan Losses - Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, Total	$ 42,201		$ 42,201		$ 29,411
Unpaid Principal Balance
Unpaid Principal Balance, Total	46,131		46,131		30,692
Related Allowance	1,527		1,527		1,360
Average Recorded Investment
Average Recorded Investment, With an allowance recorded			6
Average Recorded Investment, Total	36,846	$ 63,525	35,614	$ 56,934
Interest Income Recognized
Interest Income Recognized, Total	750	861	1,261	2,002
Multi-family
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded					0
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded					0
Unpaid Principal Balance, With an allowance recorded					0
Related Allowance					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded		2,080		1,205
Average Recorded Investment, With an allowance recorded		383		290
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded		38		38
Interest Income Recognized, With an allowance recorded		5		15
Commercial and industrial
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	19,433		19,433		2,396
Recorded Investment Net of Charge Offs, With an allowance recorded	1,060		1,060		6,120
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	22,354		22,354		3,430
Unpaid Principal Balance, With an allowance recorded	1,331		1,331		6,120
Related Allowance	625		625		1,024
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	13,345	21,859	8,796	18,681
Average Recorded Investment, With an allowance recorded	1,963	7,561	5,400	7,256
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	354	406	450	879
Interest Income Recognized, With an allowance recorded	0	43	22	155
Commercial real estate - owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	1,669		1,669		1,210
Recorded Investment Net of Charge Offs, With an allowance recorded	1,281		1,281		840
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,936		1,936		1,210
Unpaid Principal Balance, With an allowance recorded	1,281		1,281		840
Related Allowance	740		740		287
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	1,744	10,182	1,589	9,651
Average Recorded Investment, With an allowance recorded	1,056	0	950	6
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	15	201	18	403
Interest Income Recognized, With an allowance recorded	1	0	3	0
Commercial real estate - non-owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	184		184		2,002
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0		149
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	428		428		2,114
Unpaid Principal Balance, With an allowance recorded	0		0		204
Related Allowance	0		0		14
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	184	7,983	989	6,081
Average Recorded Investment, With an allowance recorded	51	328	94	438
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	91	118	93	133
Interest Income Recognized, With an allowance recorded	0	2	0	6
Other
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	32		32		57
Recorded Investment Net of Charge Offs, With an allowance recorded	24		24		0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	32		32		57
Unpaid Principal Balance, With an allowance recorded	24		24		0
Related Allowance	15		15		0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	44	43	50	45
Average Recorded Investment, With an allowance recorded	12	0		36
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	0	0	0
Interest Income Recognized, With an allowance recorded	0	0	0	0
Residential real estate
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	7,457		7,457		6,682
Recorded Investment Net of Charge Offs, With an allowance recorded	721		721		290
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	7,664		7,664		6,749
Unpaid Principal Balance, With an allowance recorded	741		741		303
Related Allowance	142		142		35
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	5,228	3,835	4,865	4,039
Average Recorded Investment, With an allowance recorded	2,862	300	2,729	421
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	125	39	126	83
Interest Income Recognized, With an allowance recorded	0	0	84	0
Manufactured housing
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	10,340		10,340		9,665
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	10,340		10,340		$ 9,665
Unpaid Principal Balance, With an allowance recorded	0		0
Related Allowance	5		5
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	10,243	8,971	10,038	8,785
Average Recorded Investment, With an allowance recorded	114		108
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	164	$ 9	457	$ 290
Interest Income Recognized, With an allowance recorded	$ 0		$ 8

Loans Receivable and Allowanc55

Loans Receivable and Allowance for Loan Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	10	36	52
Recorded Investment | $	$ 182	$ 533	$ 7,560	$ 3,927
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	0	4	3
Recorded Investment | $	$ 60	$ 0	$ 6,263	$ 1,995
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	10	32	49
Recorded Investment | $	$ 122	$ 533	$ 1,297	$ 1,932

Loans Receivable and Allowanc56

Loans Receivable and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan	Sep. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	10	36	52
Recorded Investment | $	$ 182	$ 533	$ 7,560	$ 3,927
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	3	1
Recorded Investment | $	$ 0	$ 0	$ 6,203	$ 76
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			0	1
Recorded Investment | $			$ 0	$ 1,844
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	10	33	47
Recorded Investment | $	$ 182	$ 533	$ 1,357	$ 1,716
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	0	3
Recorded Investment | $	$ 0	$ 0	$ 0	$ 291

Loans Receivable and Allowanc57

Loans Receivable and Allowance for Loan Losses - Changes in Accretable Yield Related to Purchased-credit-impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in Accretable Yield
Accretable yield balance, beginning of period	$ 9,006	$ 11,165	$ 10,202	$ 12,947
Accretion to interest income	(368)	(460)	(1,326)	(1,429)
Reclassification from nonaccretable difference and disposals, net	(276)	107	(514)	(706)
Accretable yield balance, end of period	$ 8,362	$ 10,812	$ 8,362	$ 10,812

Loans Receivable and Allowanc58

Loans Receivable and Allowance for Loan Losses - Schedule of Changes in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 38,458	$ 38,097	$ 37,315	$ 35,647
Provision for loan losses	2,352	88	5,937	3,143
Charge-offs	(2,585)	(666)	(5,576)	(1,848)
Recoveries	89	378	638	955
Ending balance	$ 38,314	$ 37,897	$ 38,314	$ 37,897

Loans Receivable and Allowanc59

Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ 0	$ (1,381)	$ 0	$ (2,083)
Other activity, net			0	(255)
Cash payments to (receipts from) the FDIC	0	1,381	0	2,049
Ending balance	0	0	0	0
Provision for loan losses	2,352	88	5,937	3,143
Effect attributable to FDIC loss share arrangements			0	(289)
Provision for loan losses	$ 2,352	$ 88	$ 5,937	$ 2,854

Loans Receivable and Allowanc60

Loans Receivable and Allowance for Loan Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,063,775	$ 6,154,561
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,844,002	5,945,115
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	76,991	56,939
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	46,025	47,294
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	89,231	96,333
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,526	8,880
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,618,989	3,214,999
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,577,304	3,198,290
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	36,604	0
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,081	16,709
Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,115,222	988,711
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,080,797	954,846
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,663	19,552
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	25,762	14,313
Commercial and industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial and industrial | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	486,567	393,632
Commercial real estate - owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	468,389	375,919
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	9,716	12,065
Commercial real estate - owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,462	5,648
Commercial real estate - owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,237,849	1,193,715
Commercial real estate - non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,212,945	1,175,850
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	22,008	10,824
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,896	7,041
Commercial real estate - non-owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - non-owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	73,203	64,789
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	73,203	50,291
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	14,498
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	435,188	193,502
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	431,364	189,919
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,824	3,583
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	92,938	101,730
Manufactured housing | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	85,537	92,920
Manufactured housing | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,401	8,810
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,819	3,483
Other | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,694	3,413
Other | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 125	$ 70

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - Senior Notes - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Debt Instrument, face amount		$ 100
Face value (as a percent)		99.775%
Effective rate (as a percent)		4.00%
Stated rate (as a percent)		3.95%
Proceeds from issuance of debt	$ 98.6

Regulatory Capital - Narrative

Regulatory Capital - Narrative (Details)	Sep. 30, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital (to risk weighted assets), for capital adequacy purposes ratio	7.25%	7.25%	6.625%	6.00%
Tier 1 capital (to risk weighted assets), to be well capitalized under prompt corrective action provisions ratio				8.00%
Capital conservation buffer, excess of minimum capital ratio				2.50%
Capital conservation buffer to risk weighted assets, year one	0.625%
Capital conservation buffer to risk weighted assets, year two	1.25%
Capital conservation buffer to risk weighted assets, year three	1.875%
Capital conservation buffer to risk weighted assets, year four and thereafter	2.50%
Common equity Tier 1 (to risk weighted assets), for capital adequacy purposes ratio	5.75%	5.75%	5.125%
Total capital (to risk weighted assets), for capital adequacy purposes ratio	9.25%	9.25%	8.625%
Customers Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital (to risk weighted assets), for capital adequacy purposes ratio	7.25%	7.25%	6.625%
Tier 1 capital (to risk weighted assets), to be well capitalized under prompt corrective action provisions ratio	8.00%		8.00%
Common equity Tier 1 (to risk weighted assets), for capital adequacy purposes ratio	5.75%	5.75%	5.125%
Total capital (to risk weighted assets), for capital adequacy purposes ratio	9.25%	9.25%	8.625%

Regulatory Capital - Summary of

Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital (to risk weighted assets), Actual Amount	$ 677,976		$ 628,139
Tier 1 capital (to risk weighted assets), Actual Amount	895,447		844,755
Total capital (to risk weighted assets), Actual Amount	1,014,784		966,097
Tier 1 capital (to average assets), Actual Amount	$ 895,447		$ 844,755
Common equity Tier 1 ( to risk weighted assets), Actual Ratio	8.284%		8.487%
Tier 1 capital (to risk weighted assets), Actual Ratio	10.941%		11.414%
Total capital (to risk weighted assets), Actual Ratio	12.399%		13.053%
Tier 1 capital (to average assets), Actual Ratio	8.355%		9.067%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	$ 470,603		$ 379,306
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	593,369		490,322
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount	757,057		638,343
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount	$ 428,709		$ 372,652
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio	5.75%	5.75%	5.125%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	7.25%	7.25%	6.625%	6.00%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	9.25%	9.25%	8.625%
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio	4.00%		4.00%
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio				8.00%
Customers Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital (to risk weighted assets), Actual Amount	$ 1,009,380		$ 857,421
Tier 1 capital (to risk weighted assets), Actual Amount	1,009,380		857,421
Total capital (to risk weighted assets), Actual Amount	1,156,766		1,003,609
Tier 1 capital (to average assets), Actual Amount	$ 1,009,380		$ 857,421
Common equity Tier 1 ( to risk weighted assets), Actual Ratio	12.342%		11.626%
Tier 1 capital (to risk weighted assets), Actual Ratio	12.342%		11.626%
Total capital (to risk weighted assets), Actual Ratio	14.145%		13.608%
Tier 1 capital (to average assets), Actual Ratio	9.434%		9.233%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	$ 470,242		$ 377,973
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	592,914		488,599
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount	756,477		636,101
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount	$ 427,963		$ 371,466
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio	5.75%	5.75%	5.125%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	7.25%	7.25%	6.625%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	9.25%	9.25%	8.625%
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio	4.00%		4.00%
Common equity Tier 1 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 531,578		$ 479,380
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	654,250		590,006
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	817,813		737,508
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 534,954		$ 464,333
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%

Disclosures About Fair Value 64

Disclosures About Fair Value of Financial Instruments - Narrative (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, average life from purchase to sale	21 days
Five-year Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Issuance of senior unsecured notes		$ 63
Unsecured Debt | Five-year Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured notes term	5 years

Disclosures About Fair Value 65

Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 219,480	$ 264,709	$ 265,588	$ 264,593
Cash and cash equivalents, Estimated Fair Value	219,480	264,709
Investment securities, available for sale, Carrying Amount	584,823	493,474
Investment securities, Estimated Fair Value	584,823	493,474
Loans held for sale, Carrying Amount	2,113,293	2,117,510
Loans held for sale, Estimated Fair Value	2,113,473	2,117,510
Loans receivable, net of allowance for loan losses, Carrying Amount	7,023,024	6,117,322
Loans receivable, net of allowance for loan losses, Estimated Fair Value	7,020,487	6,162,020
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount	98,611	68,408
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	98,611	68,408
Derivative assets	10,447	10,864
Deposits, Carrying Amount	7,597,076	7,303,775
Deposits, Estimated Fair Value	7,596,324	7,303,663
Federal funds purchased, Carrying Amount	147,000	83,000
Federal funds purchased, Estimated Fair Value	147,000	83,000
FHLB advances, Carrying Amount	1,462,343	868,800
FHLB advances, Estimated Fair Value	1,462,245	869,049
Other borrowings, Carrying Amount	186,258	87,123
Other borrowings, Estimated Fair Value	194,157	91,761
Subordinated debt, Carrying Amount	108,856	108,783
Subordinated debt, Estimated Fair Value	115,500	111,375
Derivative liabilities	12,092	14,172
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	219,480	264,709
Investment securities, Estimated Fair Value	2,311	15,246
Loans held for sale, Estimated Fair Value	0	0
Loans receivable, net of allowance for loan losses, Estimated Fair Value	0	0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	0	0
Deposits, Estimated Fair Value	5,296,636	4,472,013
Federal funds purchased, Estimated Fair Value	147,000	83,000
FHLB advances, Estimated Fair Value	727,343	688,800
Other borrowings, Estimated Fair Value	65,704	66,261
Subordinated debt, Estimated Fair Value	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	0	0
Investment securities, Estimated Fair Value	582,512	478,228
Loans held for sale, Estimated Fair Value	1,963,076	2,117,510
Loans receivable, net of allowance for loan losses, Estimated Fair Value	0	0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	98,611	68,408
Derivative assets	10,344	10,819
Deposits, Estimated Fair Value	2,299,688	2,831,650
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	734,902	180,249
Other borrowings, Estimated Fair Value	128,453	25,500
Subordinated debt, Estimated Fair Value	115,500	111,375
Derivative liabilities	12,092	14,172
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	0	0
Investment securities, Estimated Fair Value	0	0
Loans held for sale, Estimated Fair Value	150,397	0
Loans receivable, net of allowance for loan losses, Estimated Fair Value	7,020,487	6,162,020
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	103	45
Deposits, Estimated Fair Value	0	0
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	0	0
Other borrowings, Estimated Fair Value	0	0
Subordinated debt, Estimated Fair Value	0	0
Derivative liabilities	$ 0	$ 0

Disclosures About Fair Value 66

Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale securities:
Assets measured at fair value on a recurring basis	$ 2,558,346	$ 2,621,848
Assets
Assets measured at fair value on a nonrecurring basis	3,758	9,258
Specific reserves related to impaired loans	1,527	1,360
Derivative assets
Available-for-sale securities:
Assets measured at fair value on a recurring basis	10,447	10,864
Loans held for sale – fair value option
Available-for-sale securities:
Assets measured at fair value on a recurring basis	1,963,076	2,117,510
Derivative liabilities
Liabilities
Derivatives	12,092	14,172
Impaired loans, net of specific reserves
Assets
Assets measured at fair value on a nonrecurring basis	2,976	6,527
Specific reserves related to impaired loans	1,527	1,360
Other real estate owned
Assets
Assets measured at fair value on a nonrecurring basis	782	2,731
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	196,327	231,263
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	340,108	201,817
Available-for-sale Securities | Corporate notes
Available-for-sale securities:
Assets measured at fair value on a recurring basis	46,077	45,148
Available-for-sale Securities | Equity securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,311	15,246
Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,311	15,246
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities
Liabilities
Derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of specific reserves
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,311	15,246
Significant Other Observable Inputs (Level 2)
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,555,932	2,606,557
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) | Derivative assets
Available-for-sale securities:
Assets measured at fair value on a recurring basis	10,344	10,819
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Available-for-sale securities:
Assets measured at fair value on a recurring basis	1,963,076	2,117,510
Significant Other Observable Inputs (Level 2) | Derivative liabilities
Liabilities
Derivatives	12,092	14,172
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned
Assets
Assets measured at fair value on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	196,327	231,263
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	340,108	201,817
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes
Available-for-sale securities:
Assets measured at fair value on a recurring basis	46,077	45,148
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3)
Available-for-sale securities:
Assets measured at fair value on a recurring basis	103	45
Assets
Assets measured at fair value on a nonrecurring basis	3,758	9,258
Significant Unobservable Inputs (Level 3) | Derivative assets
Available-for-sale securities:
Assets measured at fair value on a recurring basis	103	45
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Derivative liabilities
Liabilities
Derivatives	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves
Assets
Assets measured at fair value on a nonrecurring basis	2,976	6,527
Significant Unobservable Inputs (Level 3) | Other real estate owned
Assets
Assets measured at fair value on a nonrecurring basis	782	2,731
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities
Available-for-sale securities:
Assets measured at fair value on a recurring basis	$ 0	$ 0

Disclosures About Fair Value 67

Disclosures About Fair Value of Financial Instruments - Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) - Significant Unobservable Inputs (Level 3) - Residential Mortgage Loan Commitments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning	$ 102	$ 157	$ 45	$ 45
Issuances	103	85	300	315
Settlements	(102)	(157)	(242)	(275)
Balance at ending	$ 103	$ 85	$ 103	$ 85

Disclosures About Fair Value 68

Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 3,108	$ 1,059
Impaired loans, net of specific reserves | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Other real estate owned | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Residential mortgage loan commitments | Adjusted Market Bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	90.00%	90.00%
Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments	$ 45	$ 103
Fair Value Estimate | Collateral Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,431	2,976
Other real estate owned	2,731	$ 782
Fair Value Estimate | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 5,096
EBITDA multiple	4

Derivative Instruments and He69

Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)DerivativeSwap	Dec. 31, 2016USD ($)DerivativeSwap
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification adjustment from accumulated other comprehensive income	$ 1.2
Assets needed for immediate settlement of derivatives in a net liability position	7.3
Minimum collateral with counterparties	$ 8.3
Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	30 days
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	60 days
Not Designated as Hedging Instrument | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 5.4	$ 3.6
Interest Rate Swaps | Derivative Designated as Cash Flow Hedges | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Number of outstanding interest rate derivatives (derivative) | Derivative	9	4
Aggregate notional amount	$ 550	$ 325
Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 793.6	$ 716.6
Number of interest rate swaps (swap) | Swap	76	76
Credit Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 53.3	$ 44.9

Derivative Instruments and He70

Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	$ 4,190	$ 4,723
Derivative Liabilities, Fair Value	8,400	9,825
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	355	0
Other Assets | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	10,092	10,864
Other Assets | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	103	45
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	9,861	10,683
Other Assets | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	128	136
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	2,001	3,624
Other Liabilities | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	10,091	10,548
Other Liabilities | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	0	0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	10,083	10,537
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	$ 8	$ 11

Derivative Instruments and He71

Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Expense | Interest Rate Swaps | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 104	$ 556	$ (115)	$ (1,577)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(572)	(703)	(2,166)	(1,306)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	86	1,651	482	1,548
Not Designated as Hedging Instrument | Other Non-interest Income | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	91	1,737	429	1,250
Not Designated as Hedging Instrument | Other Non-interest Income | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in Earnings	(6)	(15)	(5)	257
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	$ 1	$ (71)	$ 58	$ 41

Derivative Instruments and He72

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 10,447	$ 10,864
Interest Rate Swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets	4,190	4,723
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	4,190	4,723
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral received	1,900	0
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 2,290	$ 4,723

Derivative Instruments and He73

Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 12,092	$ 14,172
Interest Rate Swaps
Offsetting Liabilities [Line Items]
Gross Amount of Recognized Liabilities	8,400	9,825
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	8,400	9,825
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	8,262	4,472
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 138	$ 5,353

Business Segments (Details)

Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Segment	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)Segment	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (segment) | Segment	2			1
Interest income	$ 98,285	$ 84,212	$ 275,232	$ 238,931
Interest expense	30,266	19,627	76,189	53,561
Net interest income	68,019	64,585	199,043	185,370
Provision for loan losses	2,352	88	5,937	2,854
Non-interest income	18,026	27,486	59,170	41,237
Non-interest expense	61,040	56,218	160,818	128,306
Income before income tax expense	22,653	35,765	91,458	95,447
Income tax expense (benefit)	14,899	14,558	34,236	36,572
Net income (loss)	7,754	21,207	57,222	58,875
Preferred stock dividends	3,615	2,552	10,844	5,900
Net income (loss) available to common shareholders	4,139	18,655	46,378	52,975
Goodwill and other intangibles	16,604		16,604		$ 17,621
Assets	10,471,829		10,471,829		9,382,736
Deposits	7,597,076		7,597,076		$ 7,303,775
Combined Business Segments
Segment Reporting Information [Line Items]
Interest income	98,285	84,212	275,232	238,931
Interest expense	30,266	19,627	76,189	53,561
Net interest income	68,019	64,585	199,043	185,370
Provision for loan losses	2,352	88	5,937	2,854
Non-interest income	18,026	27,486	59,170	41,237
Non-interest expense	61,040	56,218	160,818	128,306
Income before income tax expense	22,653	35,765	91,458	95,447
Income tax expense (benefit)	14,899	14,558	34,236	36,572
Net income (loss)	7,754	21,207	57,222	58,875
Preferred stock dividends	3,615	2,552	10,844	5,900
Net income (loss) available to common shareholders	4,139	18,655	46,378	52,975
Goodwill and other intangibles	16,604	16,924	16,604	16,924
Assets	10,471,829	9,602,610	10,471,829	9,602,610
Deposits	$ 7,597,076	$ 7,388,970	$ 7,597,076	7,388,970
Operating Segments | Community Business Banking
Segment Reporting Information [Line Items]
Effective tax rate	37.25%	38.00%	38.00%
Interest income	$ 95,585	$ 82,828	$ 265,524	234,513
Interest expense	30,250	19,620	76,134	53,539
Net interest income	65,335	63,208	189,390	180,974
Provision for loan losses	1,874	(162)	5,459	2,605
Non-interest income	4,190	11,121	16,587	22,241
Non-interest expense	33,990	36,864	94,704	101,053
Income before income tax expense	33,661	37,627	105,814	99,557
Income tax expense (benefit)	18,999	15,266	39,584	38,134
Net income (loss)	14,662	22,361	66,230	61,423
Preferred stock dividends	3,615	2,552	10,844	5,900
Net income (loss) available to common shareholders	11,047	19,809	55,386	55,523
Goodwill and other intangibles	3,632	3,642	3,632	3,642
Assets	10,405,452	9,532,281	10,405,452	9,532,281
Deposits	6,815,994	6,855,788	6,815,994	6,855,788
Operating Segments | BankMobile
Segment Reporting Information [Line Items]
Interest income	2,700	1,384	9,708	4,418
Interest expense	16	7	55	22
Net interest income	2,684	1,377	9,653	4,396
Provision for loan losses	478	250	478	249
Non-interest income	13,836	16,365	42,583	18,996
Non-interest expense	27,050	19,354	66,114	27,253
Income before income tax expense	(11,008)	(1,862)	(14,356)	(4,110)
Income tax expense (benefit)	(4,100)	(708)	(5,348)	(1,562)
Net income (loss)	(6,908)	(1,154)	(9,008)	(2,548)
Preferred stock dividends	0	0	0	0
Net income (loss) available to common shareholders	(6,908)	(1,154)	(9,008)	(2,548)
Goodwill and other intangibles	12,972	13,282	12,972	13,282
Assets	66,377	70,329	66,377	70,329
Deposits	781,082	533,182	781,082	533,182
Segment Reconciling Items | BankMobile
Segment Reporting Information [Line Items]
Interest income	$ 2,700	$ 1,400	$ 9,700	$ 4,400